25 results on '"Barrucand, Mariana"'
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2. Seasonal forecast of the percentage of days with extreme temperatures in central-northern Argentina: An operational statistical approach
- Author
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Collazo, Soledad, Barrucand, Mariana, and Rusticucci, Matilde
- Published
- 2022
- Full Text
- View/download PDF
3. Evaluation of CMIP6 models in the representation of observed extreme temperature indices trends in South America
- Author
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Collazo, Soledad, Barrucand, Mariana, and Rusticucci, Matilde
- Published
- 2022
- Full Text
- View/download PDF
4. Variability and predictability of winter cold nights in Argentina
- Author
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Collazo, Soledad, Barrucand, Mariana, and Rusticucci, Matilde
- Published
- 2019
- Full Text
- View/download PDF
5. Summer seasonal predictability of warm days in Argentina: statistical model approach
- Author
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Collazo, Soledad, Barrucand, Mariana, and Rusticucci, Matilde
- Published
- 2019
- Full Text
- View/download PDF
6. Long-lasting floods buffer the thermal regime of the Pampas
- Author
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Houspanossian, Javier, Kuppel, Sylvain, Nosetto, Marcelo, Di Bella, Carlos, Oricchio, Patricio, Barrucand, Mariana, Rusticucci, Matilde, and Jobbágy, Esteban
- Published
- 2016
- Full Text
- View/download PDF
7. Warm and cold dry months and associated circulation in the humid and semi-humid Argentine region
- Author
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Barrucand, Mariana, Vargas, Walter, and Bettolli, María Laura
- Published
- 2014
- Full Text
- View/download PDF
8. Observed Trends and Changes in Temperature Extremes over Argentina
- Author
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Rusticucci, Matilde and Barrucand, Mariana
- Published
- 2004
9. Temporal variability of the Buenos Aires, Argentina, urban heat island
- Author
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Camilloni, Inés and Barrucand, Mariana
- Published
- 2012
- Full Text
- View/download PDF
10. Historical SAM index time series: linear and nonlinear analysis
- Author
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Barrucand, Mariana G., primary, Zitto, Miguel E., additional, Piotrkowski, Rosa, additional, Canziani, Pablo, additional, and O'Neill, Alan, additional
- Published
- 2018
- Full Text
- View/download PDF
11. Temperature extremes in the Argentina central region and their monthly relationship with the mean circulation and ENSO phases
- Author
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Rusticucci, Matilde, primary, Barrucand, Mariana, additional, and Collazo, Soledad, additional
- Published
- 2016
- Full Text
- View/download PDF
12. 110 years of temperature observations at Orcadas Antarctic Station: multidecadal variability
- Author
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Zitto, Miguel Eduardo, Barrucand, Mariana Graciela, Piotrkowski, Rosa, and Canziani, Pablo Osvaldo
- Subjects
ANTARCTICA ,MULTIDECADAL VARIABILITY ,WAVELET TRANSFORM ,CLIMATE CHANGE ,SURFACE TEMPERATURE ,Meteorología y Ciencias Atmosféricas ,TEMPERATURE TREND ,CIENCIAS NATURALES Y EXACTAS ,Ciencias de la Tierra y relacionadas con el Medio Ambiente - Abstract
There is growing evidence of significant changes in components of the Antarctic climate system, an important issue given the influence Antarctica has on global climate. It is important to infer to what extent these regional changes could be attributed to human-induced processes and to what extent to natural variability. Standard methods, such as linear trend estimates or piecewise linear trends can be inadequate since they may result in erratic, non-systematic results, particularly if different scales of variability are present in each record and various records are to be compared. The Orcadas Antarctic Station (Agentina), with daily surface meteorological observations since April 1903, provides Antarctica´s longest observational record. This study analyzes the Orcadas seasonal surface temperature variability. Multidecadal variability and short term trends are studied to provide an improved assessment of climate evolution and necessary information for the determination of mechanisms driving regional/local change. A combined method using Wavelet Transform (WT), non-linear statistical model approaches and derivative of fits is developed. This methodology is also applied for validation and comparison to the Gomez ice core oxygen isotope record for the 1857-2006 and 1903-2006 time intervals. Significant quasi 50-year and quasi 20-year variability bands were obtained, both for the quarterly and seasonal Orcadas temperature records, with warming (cooling) periods detected between 1903-1912, 1927- 1961 and 1972-2004 (1912-1927 and 1962-1972). If seasons are considered, the only one with a fairly sustained warming is summer, where actual cooling is observed only at the beginning, prior to the early 1930s. Quasi 50-year variability was also detected in the Gomez record. Long periods are obtained in the model fits, longer than the time series, which varied with window length. Though not representing variability cycles, they could represent the best fit of the non-linear, non oscillating asymptotic stationary component of the series, i.e. a non-linear trend. Fil: Zitto, Miguel Eduardo. Universidad de Buenos Aires; Argentina. Universidad Tecnológica Nacional; Argentina Fil: Barrucand, Mariana Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina Fil: Piotrkowski, Rosa. Universidad de Buenos Aires; Argentina. Universidad Nacional de San Martín; Argentina Fil: Canziani, Pablo Osvaldo. Universidad Tecnológica Nacional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
- Published
- 2015
13. Climate change and its impacts: perception and adaptation in rural areas of Manizales, Colombia
- Author
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Barrucand, Mariana G., primary, Giraldo Vieira, Carolina, additional, and Canziani, Pablo O., additional
- Published
- 2016
- Full Text
- View/download PDF
14. Variability at low frequencies with wavelet transform and empirical mode decomposition: Aplication to climatological series
- Author
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Zitto, Miguel E., primary, Piotrkowski, Rosa, additional, Barrucand, Mariana, additional, and Canziani, Pablo, additional
- Published
- 2015
- Full Text
- View/download PDF
15. Long-lasting floods buffer the thermal regime of the Pampas.
- Author
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Houspanossian, Javier, Kuppel, Sylvain, Nosetto, Marcelo, Di Bella, Carlos, Oricchio, Patricio, Barrucand, Mariana, Rusticucci, Matilde, and Jobbágy, Esteban
- Subjects
FLOODS ,WATER masses ,TEMPERATURE ,LAND surface temperature ,ECOSYSTEMS - Abstract
The presence of large water masses influences the thermal regime of nearby land shaping the local climate of coastal areas by the ocean or large continental lakes. Large surface water bodies have an ephemeral nature in the vast sedimentary plains of the Pampas (Argentina) where non-flooded periods alternate with flooding cycles covering up to one third of the landscape for several months. Based on temperature records from 17 sites located 1 to 700 km away from the Atlantic coast and MODIS land surface temperature data, we explore the effects of floods on diurnal and seasonal thermal ranges as well as temperature extremes. In non-flooded periods, there is a linear increase of mean diurnal thermal range (DTR) from the coast towards the interior of the region (DTR increasing from 10 to 16 K, 0.79 K/100 km, r = 0.81). This relationship weakens during flood episodes when the DTR of flood-prone inland locations shows a decline of 2 to 4 K, depending on surface water coverage in the surrounding area. DTR even approaches typical coastal values 500 km away from the ocean in the most flooded location that we studied during the three flooding cycles recorded in the study period. Frosts-free periods, a key driver of the phenology of both natural and cultivated ecosystems, are extended by up to 55 days during floods, most likely as a result of enhanced ground heat storage across the landscape (~2.7 fold change in day-night heat transfer) combined with other effects on the surface energy balance such as greater night evaporation rates. The reduced thermal range and longer frost-free periods affect plant growth development and may offer an opportunity for longer crop growing periods, which may not only contribute to partially compensating for regional production losses caused by floods, but also open avenues for flood mitigation through higher plant evapotranspirative water losses. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
16. Mean winter conditions and quasi-stationary Rossby waves associated with the winter frequency of warm and cold nights in subtropical Argentina
- Author
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Agosta Scarel, Eduardo Andres and Barrucand, Mariana Graciela
- Subjects
purl.org/becyt/ford/1 [https] ,Extremos ,purl.org/becyt/ford/1.5 [https] ,Teleconexiones ,Ondas cuasi estacionarias de Rossby ,Meteorología y Ciencias Atmosféricas ,Temperatura mínima diaria ,CIENCIAS NATURALES Y EXACTAS ,Ciencias de la Tierra y relacionadas con el Medio Ambiente - Abstract
El estudio busca definir las condiciones medias de la circulación troposférica y posibles forzantes asociados a la frecuencia de ocurrencia de noches frías (TN10) y noches cálidas (TN90) durante el invierno austral (JJA) sobre Argentina subtropical, al norte de 40°S y adyacencias (ASA) a partir de datos de estaciones meteorológicas y de reanálisis (NCEP/DOE AMIP-II y ECMWF ERA-interim). Se encuentra que la frecuencia de noches cálidas (Tmin superiores al percentil 90, TN90) está modulada interanualmente por la propagación de ondas cuasi-estacionarias (OCE) de Rossby inducidas por anomalías de convección en el Índico y el Pacífico. La alta frecuencia de noches cálidas está asociada a calentamiento anómalo del Pacífico central ecuatorial (fase positiva del El Niño-Oscilación del Sur, ENOS). La baja frecuencia de noches cálidas está relacionada con convección anómala sobre el área monzónica de la India y el Índico sur tropical occidental. Esto favorece la propagación de actividad de OCE de Rossby sobre el Índico, el Pacífico y el sur de Sudamérica. Tal teleconexión a su vez favorece la alta frecuencia de noches frías (Tmin inferiores al percentil 10, TN10). En cambio la baja frecuencia de noches frías está vinculada a variabilidad de baja frecuencia del modo de variabilidad de altas latitudes del hemisferio sur (el MAS). Se encuentra que el fortalecimiento (debilitamiento) del jet subtropical sobre Sudamérica y océanos adyacentes caracteriza los inviernos con alta (baja) frecuencia de noches frías (cálidas) en ASA. Los forzantes remotos encontrados involucran procesos atmosféricos/oceánicos que se interconectan interestacionalmente, lo cual podría permitir desarrollar el pronóstico estadístico-dinámico para invierno de alta o baja frecuencia de noches frías o cálidas en invierno. The study aims to examine the mean conditions of the tropospheric circulation and possible forcing associated with the occurrence frequency of cold nights (TN10) and warm nights (TN90) during winter (JJA) over subtropical Argentina, to the north of 40°S and surrounding areas (ASA) from meteorological stations and (NCEP/DOE AMIP-II and ECMWF ERA-interim) reanalysis data. It is found that the frequency of warm nights (Tmin over percentile 90, TN90) is modulated at interannual scales by quasi-stationary wave propagation induced by convection anomalies in the Indic and Pacific. The high frequency of warm nights is associated with anomalous warming over the central equatorial Pacific (positive phase of El Niño-Southern Oscillation, ENSO). The low frequency of warm nights is linked to anomalous convection over the monsoon Indian area and the western tropical southern Indic. Hence quasi-stationary Rossby wave activity propagation is favored over the Indic, Pacific and southern South America. Such a teleconnection favors in turn the high fequency of cold nights (Tmin below percentile 10, TN10). Instead, the low frequency of cold nights is linked to the low-frequency variability of the Southern Hemisphere high-latitude mode (SAM). It is found that winters with high (low) frequency of cold (warm) nights are characterized by a strengthening (weakening) of the subtropical jet over southern South America and adjacent areas. The current remote forcings are related with atmospheric/oceanic processes that are interconnected at seasonal-interseasonal scales, which could allow us to develop statistical-dynamical forecasts for the higher or lower occurrence of warm or cold nights in winter. Fil: Agosta Scarel, Eduardo Andres. Pontificia Universidad Católica Argentina "Santa María de Los Buenos Aires"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Barrucand, Mariana Graciela. Pontificia Universidad Católica Argentina "Santa María de Los Buenos Aires"; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
- Published
- 2012
17. Condiciones medias de invierno y ondas cuasi-estacionarias de Rossby asociadas a la frecuencia invernal de noches frías y cálidas en Argentina subtropical
- Author
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Agosta, Eduardo A. and Barrucand, Mariana G.
- Subjects
CLIMATOLOGIA ,TEMPERATURA AMBIENTAL ,METEREOLOGIA ,ATMOSFERA ,TELECONEXIONES TROPOSFERICAS ,REGION SUBTROPICAL ,ONDAS CUASI-ESTACIONARIAS DE ROSSBY - Abstract
Fil: Agosta, Eduardo A. Pontificia Universidad Católica Argentina. Equipo Interdisciplinario para el Estudio de Procesos Atmosféricos en el Cambio Global; Argentina Fil: Agosta, Eduardo A. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Barrucand, Mariana G. Pontificia Universidad Católica Argentina. Equipo Interdisciplinario para el Estudio de Procesos Atmosféricos en el Cambio Global; Argentina Fil: Barrucand, Mariana G. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Barrucand, Mariana G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina Resumen: El estudio busca definir las condiciones medias de la circulación troposférica y posibles forzantes asociados a la frecuencia de ocurrencia de noches frías (TN10) y noches cálidas (TN90) durante el invierno austral (JJA) sobre Argentina subtropical, al norte de 40°S y adyacencias (ASA) a partir de datos de estaciones meteorológicas y de reanálisis (NCEP/DOE AMIP-II y ECMWF ERA-interim). Se encuentra que la frecuencia de noches cálidas (Tmin superiores al percentil 90, TN90) está modulada interanualmente por la propagación de ondas cuasi-estacionarias (OCE) de Rossby inducidas por anomalías de convección en el Índico y el Pacífico. La alta frecuencia de noches cálidas está asociada a calentamiento anómalo del Pacífico central ecuatorial (fase positiva del El Niño-Oscilación del Sur, ENOS). La baja frecuencia de noches cálidas está relacionada con convección anómala sobre el área monzónica de la India y el Índico sur tropical occidental. Esto favorece la propagación de actividad de OCE de Rossby sobre el Índico, el Pacífico y el sur de Sudamérica. Tal teleconexión a su vez favorece la alta frecuencia de noches frías (Tmin inferiores al percentil 10, TN10). En cambio la baja frecuencia de noches frías está vinculada a variabilidad de baja frecuencia del modo de variabilidad de altas latitudes del hemisferio sur (el MAS). Se encuentra que el fortalecimiento (debilitamiento) del jet subtropical sobre Sudamérica y océanos adyacentes caracteriza los inviernos con alta (baja) frecuencia de noches frías (cálidas) en ASA. Los forzantes remotos encontrados involucran procesos atmosféricos/oceánicos que se interconectan interestacionalmente, lo cual podría permitir desarrollar el pronóstico estadístico-dinámico para invierno de alta o baja frecuencia de noches frías o cálidas en invierno. Abstract: The study aims to examine the mean conditions of the tropospheric circulation and possible forcing associated with the occurrence frequency of cold nights (TN10) and warm nights (TN90) during winter (JJA) over subtropical Argentina, to the north of 40°S and surrounding areas (ASA) from meteorological stations and (NCEP/DOE AMIP-II and ECMWF ERA-interim) reanalysis data. It is found that the frequency of warm nights (Tmin over percentile 90, TN90) is modulated at interannual scales by quasi-stationary wave propagation induced by convection anomalies in the Indic and Pacific. The high frequency of warm nights is associated with anomalous warming over the central equatorial Pacific (positive phase of El Niño-Southern Oscillation, ENSO). The low frequency of warm nights is linked to anomalous convection over the monsoon Indian area and the western tropical southern Indic. Hence quasi-stationary Rossby wave activity propagation is favored over the Indic, Pacific and southern South America. Such a teleconnection favors in turn the high fequency of cold nights (Tmin below percentile 10, TN10). Instead, the low frequency of cold nights is linked to the low-frequency variability of the Southern Hemisphere high-latitude mode (SAM). It is found that winters with high (low) frequency of cold (warm) nights are characterized by a strengthening (weakening) of the subtropical jet over southern South America and adjacent areas. The current remote forcings are related with atmospheric/oceanic processes that are interconnected at seasonal-interseasonal scales, which could allow us to develop statistical-dynamical forecasts for the higher or lower occurrence of warm or cold nights in winter.
- Published
- 2012
18. 110 years of temperature observations at Orcadas Antarctic Station: multidecadal variability
- Author
-
Zitto, Miguel E., primary, Barrucand, Mariana G., additional, Piotrkowski, Rosa, additional, and Canziani, Pablo O., additional
- Published
- 2015
- Full Text
- View/download PDF
19. Climate change and its impacts: perception and adaptation in rural areas of Manizales, Colombia.
- Author
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Barrucand, Mariana G., Giraldo Vieira, Carolina, and Canziani, Pablo O.
- Subjects
TROPICAL climate ,SOCIAL ecology ,CLIMATE change ,AGRICULTURAL climatology ,COFFEE growing - Abstract
Tropical social-ecological systems are highly vulnerable to climate change, given the limited natural climate variability in the tropics. Tropical rural populations, with livelihoods dependent on agriculture, are particularly vulnerable to climate variability and changes. To develop climate change social communication, plan and implement adaptation, it is necessary to understand regional/local climate process, risks and opportunities. It is also important to understand how local populations perceive such changes and adapt their livelihoods. Limited information is available on climate change perceptions in tropical Latin American rural populations. Hence, a climate study and climate change perception survey were carried out in the Manizales Municipality, in the Andean region of Colombia and one of its major coffee-growing areas. The study spanned three “thermal” levels in the tropical Andes, 1000 m a.s.l. and above, each with distinct environments and livelihoods. Climate analysis yielded significant warming trends in recent decades, particularly in temperature minima for all levels, but no significant local precipitation trends. The perception survey, carried out in a sparsely populated region, mostly with limited accessibility, included 37 households, with structured and semi-structured interviews, adapted to local culture. Interviewees had little or no previous knowledge on climate change. However, almost all had perceived significant changes in both temperature and precipitation, which impacted their livelihoods and environment. Some perceptions could result from a La Niña event prior to the survey, and other environmental destruction processes. Their responses to change were spontaneous adaptation, based on traditional practices and agricultural technical advice from state agencies and coffee grower associations. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
- Full Text
- View/download PDF
20. Temperature extremes in the Argentina central region and their monthly relationship with the mean circulation and ENSO phases.
- Author
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Rusticucci, Matilde, Barrucand, Mariana, and Collazo, Soledad
- Subjects
- *
ATMOSPHERIC temperature , *SOUTHERN oscillation , *ANTICYCLONES , *JET streams ,EL Nino - Abstract
ABSTRACT The aim of this study is to analyse the interannual variability of monthly climatic indices of extreme daily temperature in the central-north region of Argentina throughout a year and its relationship with the atmospheric circulation. The impact of El Niño-Southern Oscillation ( ENSO) over different temperature indices throughout the year is specially analysed. Globally used indices in the 1970-2010 period are utilized for this purpose. The trends of temperature extremes show warming conditions in several months, especially in October and November. In order to find possible forcings of extreme temperature in the region at monthly scale, the co-variability with other circulation monthly time series such as changes in the intensity of Southern Hemisphere semi-permanent anticyclones and the intensity of the subtropical jet were studied. The main finding was a systematic shift of the South Atlantic anticyclone towards the west over the decades in June and August, which might hinder the cold advections over the region surveyed. Moreover, the influence of the variation on the intensity of the subtropical jet over extreme events showed significant positive (negative) correlations between the intensity of the jet and the frequency of cold (warm) indices in a great number of months. Finally, the influence of the ENSO phases on each of the temperature extremes analysed was studied. It was found that under El Niño conditions, minimum temperatures are affected quite evenly throughout the year, fostering the occurrence of warm nights. The impact of the El Niño event on the maximum extreme temperatures, however, shows seasonal differences. Between July and September warm days conditions are fostered, while between November and February the opposite (cold days) can be seen. This results in a decrease in the temperature range in the region surveyed during the summer months under El Niño conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
21. Warm and cold dry months and associated circulation in the humid and semi-humid Argentine region
- Author
-
Barrucand, Mariana, primary, Vargas, Walter, additional, and Bettolli, María Laura, additional
- Published
- 2013
- Full Text
- View/download PDF
22. 110 years of temperature observations at Orcadas Antarctic Station: multidecadal variability.
- Author
-
Zitto, Miguel E., Barrucand, Mariana G., Piotrkowski, Rosa, and Canziani, Pablo O.
- Subjects
- *
SPATIO-temporal variation , *METEOROLOGICAL observations , *WAVELET transforms , *SURFACE temperature , *CLIMATE change models ,ANTARCTIC climate - Abstract
ABSTRACT There is growing evidence of significant changes in components of the Antarctic climate system, an important issue given the influence Antarctica has on global climate. It is important to infer to what extent these regional changes could be attributed to human-induced processes and to what extent to natural variability. Standard methods such as linear trend estimates or piecewise linear trends can be inadequate because they may result in erratic, non-systematic results, particularly if different scales of variability are present in each record and various records are to be compared. The Orcadas Antarctic Station (Argentina), with daily surface meteorological observations since April 1903, provides Antarctica's longest observational record. This study analyses the Orcadas seasonal surface temperature variability. Multidecadal variability and short-term trends are studied to provide an improved assessment of climate evolution and necessary information for the determination of mechanisms driving regional/local change. A combined method using wavelet transform ( WT), non-linear statistical model approaches and derivative of fits is developed. This methodology is also applied for validation and comparison to the Gomez ice core oxygen isotope record for the 1857-2006 and 1903-2006 time intervals. Significant quasi 50-year and quasi 20-year variability bands were obtained, both for the quarterly and seasonal Orcadas temperature records, with warming (cooling) periods detected between 1903-1912, 1927-1961 and 1972-2004 (1912-1927 and 1962-1972). If seasons are considered, the only one with a fairly sustained warming is summer, where actual cooling is observed only at the beginning, prior to the early 1930s. Quasi 50-year variability was also detected in the Gomez record. Long periods are obtained in the model fits, longer than the time series, which varied with window length. Although not representing variability cycles, they could represent the best fit of the non-linear, non oscillating asymptotic stationary component of the series, i.e. a non-linear trend. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
23. Temporal variability of the Buenos Aires, Argentina, urban heat island
- Author
-
Camilloni, Inés, primary and Barrucand, Mariana, additional
- Published
- 2011
- Full Text
- View/download PDF
24. Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
- Author
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Barrucand, Mariana, primary, Rusticucci, Matilde, additional, and Vargas, Walter, additional
- Published
- 2008
- Full Text
- View/download PDF
25. Quantification of the impact of extreme climatic events of temperature on the wheat yields of the extended Pampean region analyzed over a period of 30 years
- Author
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Barberis, Juan Guillermo and Barrucand, Mariana
- Abstract
Dentro de las variables que influyen en la obtención del rendimiento de un cultivo agrícola, una delas fuentes de mayor variabilidad es el clima, sobre todo para aquellos casos que se realizan a cielo abierto yen secano, como es el caso del trigo en la Región Pampeana. En este trabajo de tesis se realiza un estudioexhaustivo a escala climática de la influencia de los extremos de temperatura en los rendimientos de trigoocurridos en los últimos 30 años, en diferentes sitios de la Región Pampeana ampliada (Argentina). Para ellose tomaron distintos índices térmicos a escala decádica (10 días) y mensual, derivados de datos diarios detemperatura máxima y mínima de 28 localidades de la región y datos fenométricos de rendimientos de trigosuministrados por el Ministerio de Agricultura, Ganadería y Pesca de la Nación, para las campañas agrícolas 1980-1981 al 2009-2010. Los índices de extremos de temperatura considerados tuvieron en cuenta, para sudefinición, umbrales fijos de interés agronómico (tales como los asociados a heladas meteorológicas oagrometeorológicas) y umbrales basados en percentiles (10 y 90), de manera de tomar aquellos casosextremos respecto a la climatología de cada lugar. Además de los índices mencionados se consideró tambiénla amplitud térmica (DTR). Distintas metodologías estadísticas, que incluyeron cálculos de correlaciones ymétodos no paramétricos, permitieron encontrar asociaciones significativas entre los extremos detemperatura y los rendimientos. Los resultados obtenidos destacan un impacto diferenciado de cada extremo,no solamente en lo que respecta al índice térmico o a la etapa fenológica del trigo, sino también a la regiónde la Pampa Húmeda considerada. Los índices relacionados con temperaturas mínimas y máximas cálidastuvieron una influencia negativa sobre los rendimientos, siendo más marcado el efecto de las máximascálidas en las localidades del oeste y de las mínimas cálidas en las estaciones del este, donde climáticamentehay una mejor disponibilidad de agua. Esto se termina reflejando en las relaciones encontradas con DTR, que en términos generales evidencia una relación positiva en las localidades ubicadas en eleste de la Pampa Húmeda, mientras que las ubicadas al oeste presentan una relación negativa. Losíndices relacionados con las temperaturas mínimas frías tuvieron un impacto diferenciado (positivo onegativo) en función del período (y por ende, la fase fenológica) considerado. Los resultados vinculados conlas temperaturas “máximas frías”, en cambio, evidenciaron un influencia positiva en todo el ciclo del trigo. Estos resultados resaltan la importancia que tiene el estudio de extremos climáticos en forma diferenciada, yplantean la necesidad de poder avanzar en estudios de pronóstico estacional de extremos climáticos paramejorar las estrategias de manejo de cultivos Among the variables that influence the yield of an agricultural crop, one of the sources of greatervariability is the climate, especially in opencast and rainfed agriculture, such as the case of wheat in the Argentine Pampa. In this thesis, a comprehensive climatic study of the influence of temperature extremes on wheat yields occurring in the last 30 years at different sites of the extended Pampean Region (Argentina) is carried out. To do this, different thermal indices were taken at decadic (10 days) and monthly scale, derivedfrom daily data of maximum and minimum temperature of 28 meteorological station of the region andphenometric data of wheat yields supplied by the Ministry of Agriculture, Livestock and Fisheries, for theagricultural campaigns 1980-81 to 2009-2010. The temperature extremes indices considered, for theirdefinition, fixed thresholds of agronomic interest (such as those associated with meteorological or agrometeorological frosts) and thresholds based on percentiles (10 and 90), in order to take extreme cases withrespect to the climatology of each place. In addition to the mentioned indices, the diurnal temperature range (DTR) was also considered. Different statistical methodologies, including correlations calculus and nonparametricmethods, allowed to find significant associations between temperature extremes and yields. Theresults highlight a differentiated impact of each thermal extreme, not only with respect to the index analyzedor the phenological stage of the wheat, but also to the region of the Pampa Humid considered. The indicesrelated to minimum and maximum temperatures had a negative influence on the yields. The warmermaximum temperature (warm days) had a greater impact over the western locations and the warmestminimum temperature (warm nights) in the eastern stations, where climatically there is a better wateravailability. This is reflected in the relationships found with DTR, which in general terms showed a positive (negative) relationship in the localities located in the east (west) of the Humid Pampa. The indices related tothe cold minimum temperatures (cold nights) had a differentiated impact (positive or negative) in relation tothe period (and therefore, the phenological phase) considered. The results associated with the "coldmaximum" temperatures (cold days), on the other hand, showed a positive influence throughout the wheatcycle. These results highlight the importance of the study of climatic extremes in a differentiated way, andraise the need to progress in seasonal forecast studies of climatic extremes to improve crop managementstrategies. Fil: Barberis, Juan Guillermo. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
- Published
- 2018
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