6 results
Search Results
2. Climate change impacts on hydrometeorological variables using a bias correction method: The lake Karla watershed case.
- Author
-
Tzabiras, John, Vasiliades, Lampros, Loukas, Athanasios, and Mylopoulos, Nikitas
- Subjects
CLIMATE change research ,HYDROMETEOROLOGY ,WATERSHEDS ,METEOROLOGICAL precipitation ,TIME series analysis - Abstract
This paper is dealing with the assessment of climate change scenarios on selected meteorological variables at the Lake Karla watershed, central Greece and it is a contribution to the "HYDROMENTOR" research project. A statistical downscaling method has been employed to estimate monthly precipitation and temperature time series for future climate periods. The outputs of the Canadian Centre for Climate Modeling Analysis Global Circulation Model CGCM3 were applied for three socioeconomic scenarios, namely SRES B 1, SRES A 1B and SRES A2 for the assessment of climate change impact on precipitation and temperature. The methodology has been developed for the historical period 1980-2000 and applied for two future periods 2030-2050 and 2080-2100. Historical and future periods were compared for monthly and annual basis using various statistical criteria such as the mean and standard deviation. Results showed that climate change will have minor impacts on precipitation and even smaller impacts on temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2015
3. High resolution projections for extreme temperatures and precipitation over Greece.
- Author
-
Politi, Nadia, Vlachogiannis, D., Sfetsos, A., and Nastos, P. T.
- Subjects
METEOROLOGICAL research ,WEATHER forecasting ,TEMPERATURE - Abstract
The present study investigated future temperature and precipitation changes over Greece using the Weather Research and Forecasting (WRF) model. WRF was driven by EC-EARTH over Greece at very high resolution for the historical period (1980–2004), along with projected simulations, in the near future (2025–2049) and far future (2075–2099) under the Representative Concentration Pathways 4.5 (RCP4.5) and 8.5 (RCP8.5). Climatic variables were produced at 5-km grid spacing and 6-h interval. The historical simulation was evaluated against the available station observations. The analysis showed that the model underestimated the maximum temperatures and slightly overestimated the minimum temperatures. Also, the model simulated a small dry bias in precipitation with an excellent representation of the spatial patterns. The model projections for temperature under the two emission scenarios compared to the historical simulation revealed a robust magnitude of future warming with the most pronounced changes predominantly over the eastern areas of the country under the RCP8.5 in the far future. Projected precipitation changes were more evident in the far future with an overall decrease of the annual precipitation all over the eastern part of the country (with islands included) with the most dramatic reductions (above 40%) of seasonal precipitation observed under RCP8.5. Increases in the number of hot days were found everywhere with more pronounced changes over the plain areas under RCP8.5 in the far future. Significant increases of dry days were projected over the eastern part of the mainland and more intensely under RCP8.5 in the far future. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. MATHEMATICAL-STATISTICAL ANALYSIS OF HYDROLOGICAL AND METEOROLOGICAL DATA FROM THE WATERSHED OF DOJRAN LAKE.
- Author
-
Gjesovska, Violeta
- Subjects
- *
HYDROLOGY , *RIVERS , *METEOROLOGICAL precipitation , *WATERSHEDS - Abstract
Dojran Lake is the smallest natural lake in Macedonia, but is very important water resource for population in the region. Main economy in the region is tourism and fishery. Dojran Lake with its hydrological basin is a closed hydrological system with natural inflow of water to the lake, but no natural outflow. Recharge of the lake is from direct surface and underground inflow. In the period 1988-2000, the water level in the lake continuously was declining. Water level declination caused ecological catastrophe for the flora and fauna in the lake and lake's basin. In 2002, the Republic of Macedonia finished a project to build a system for bringing water from Gjavato wells near Vardar River with capacity of 1 m /s. The water level in the lake has recently increased. The reasons for changing the water level in the lake are not clearly identified, and they are located in hydrological conditions or uncontrolled usage the water from the lake. In order to define the causes of changes in the lake requires detailed hydrological and meteorological analysis. This paper will present the results of mathematical-statistical analysis on the basis of historical data of measured water level, precipitation, and air temperature from hydro-meteorological stationNew Dojran for the period 1961-2008. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
5. High-resolution dynamical downscaling of ERA-Interim temperature and precipitation using WRF model for Greece.
- Author
-
Politi, N., Vlachogiannis, D., Sfetsos, A., and Nastos, P. T.
- Subjects
DOWNSCALING (Climatology) ,WEATHER forecasting ,METEOROLOGICAL research ,ATMOSPHERIC temperature ,SEASONS - Abstract
This study presents the results of high-resolution dynamical downscaling of 5 km on maximum (TX) and minimum (TN) air temperature and precipitation, for Greece, with the Weather Research and Forecasting (WRF) model. The ERA-Interim (ERA-I) reanalysis dataset is used for initial and boundary conditions. The model results (WRF_5) are evaluated against available ground observations for the period 1980–2004 through the calculation of mean climatology, statistical metrics, and distributions of extreme events on daily, monthly and seasonal scales. WRF_5 model captures very well the geographical distribution of TX and TN of the study area, and illustrates finely the seasonal differences. Statistical results for TX (TN) indicate a cold (warm) bias of − 0.6 °C (1 °C) regarding WRF_5 and − 3 °C (0.5 °C) for ERA-I. The efficiency metrics for temperatures showed a highly improved performance of the model compared to reanalysis for all temporal scales investigated. The observed mean annual cycle and inter-annual variability of precipitation are also well represented by model simulation. Although WRF_5 overestimates rainfall during most of the year, the seasonal pattern of WRF_5 presented similar correlation coefficients for all stations with a range of 0.6–0.85, showing a good model ability to simulate the precipitation in Greece. The results reveal the capability of the configured WRF high resolution model to reproduce the main climatological variables of the study area, outperforming the coarse resolution ERA-Interim in a region that is dominated by highly variable topographic characteristics. This is deemed necessary for undertaking any further studies concerning future climate change impacts in various sectors. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
6. Identifying potential effects of climate change on the development of water resources in Pinios River Basin, Central Greece.
- Author
-
Arampatzis, G., Panagopoulos, A., Pisinaras, V., Tziritis, E., and Wendland, F.
- Subjects
CLIMATE change ,GENERAL circulation model ,CIRCULATION models ,WATER resources development - Abstract
The aim of the present study is to assess the future spatial and temporal distribution of precipitation and temperature, and relate the corresponding change to water resources’ quantitative status in Pinios River Basin (PRB), Thessaly, Greece. For this purpose, data from four Regional Climate Models (RCMs) for the periods 2021-2100 driven by several General Circulation Models (GCMs) were collected and bias-correction was performed based on linear scaling method. The bias-correction was made based on monthly precipitation and temperature data collected for the period 1981-2000 from 57 meteorological stations in total. The results indicate a general trend according to which precipitation is decreasing whilst temperature is increasing to an extent that varies depending on each particular RCM-GCM output. On the average, annual precipitation change for the period 2021-2100 was about − 80 mm, ranging between − 149 and + 35 mm, while the corresponding change for temperature was 2.81 °C, ranging between 1.48 and 3.72 °C. The investigation of potential impacts to the water resources demonstrates that water availability is expected to be significantly decreased in the already water-stressed PRB. The water stresses identified are related to the potential decreasing trend in groundwater recharge and the increasing trend in irrigation demand, which constitutes the major water consumer in PRB. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.