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320 results on '"Spagnolo, Matteo"'

1. List of contributors

Author

Akçar, Naki, primary, Allaart, Lis, additional, Allard, James, additional, Andrés, Nuria, additional, Ardelean, Florina, additional, Ardelean, Mircea, additional, Ásbjörnsdóttir, Lovísa, additional, Bell, Benjamin A., additional, Benediktsson, Ívar Örn, additional, Berzescu, Oana, additional, Bitinas, Albertas, additional, Blard, Pierre-Henri, additional, Börner, Andreas, additional, Braithwaite, Roger J., additional, Brynjólfsson, Skafti, additional, Bushueva, Irina S., additional, Błaszkiewicz, Mirosław, additional, Calvet, Marc, additional, Cartapanis, Olivier, additional, Chapron, Emmanuel, additional, Charton, Joanna, additional, Clark, Chris D., additional, Colucci, Renato R., additional, Cornelissen, Henk L., additional, Delmas, Magali, additional, Farnsworth, Wesley R., additional, Fernandes, Marcelo, additional, Fernández-Fernández, José M., additional, Fink, David, additional, Fletcher, William J., additional, Gauld, Jessica, additional, Gibbard, Philip L., additional, Giraudi, Carlo, additional, Glasser, Neil F., additional, Glazovsky, Andrey F., additional, Greenwood, Sarah L., additional, Gunnell, Yanni, additional, Guobyte, Rimante, additional, Gdek, Bogdan, additional, Hughes, Anna L.C., additional, Hughes, Philip D., additional, Ivy-Ochs, Susan, additional, Jomelli, Vincent, additional, Kłapyta, Piotr, additional, Le Roy, Melaine, additional, Mangerud, Jan, additional, Marks, Leszek, additional, Matthews, John A., additional, Monegato, Giovanni, additional, Naughton, Filipa, additional, Nesje, Atle, additional, Nicolussi, Kurt, additional, Oliva, Marc, additional, Onaca, Alexandru, additional, Palacios, David, additional, Pope, Richard, additional, Regnéll, Carl, additional, Reitner, Jürgen M., additional, Reixach, Théo, additional, René, Pierre, additional, Rhoujjati, Ali, additional, Ribolini, Adriano, additional, Rinterknecht, Vincent, additional, Sánchez Goñi, Maria Fernanda, additional, Schimmelpfennig, Irene, additional, Seppä, Heikki, additional, Solomina, Olga, additional, Spagnolo, Matteo, additional, Stoffel, Markus, additional, Tanarro, Luis M., additional, Tomkins, Matt D., additional, Tylmann, Karol, additional, Urdea, Petru, additional, Woodward, Jamie, additional, and Zasadni, Jerzy, additional

Published
2024
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8. List of contributors

Author

Akçar, Naki, primary, Allaart, Lis, additional, Allard, James L., additional, Andrés, Nuria, additional, Ardelean, Florina, additional, Ardelean, Mircea, additional, Ásbjörnsdóttir, Lovísa, additional, Avery, Rachael S., additional, Benediktsson, Ívar Örn, additional, Berzescu, Oana, additional, Bitinas, Albertas, additional, Börner, Andreas, additional, Brynjólfsson, Skafti, additional, Błaszkiewicz, Mirosław, additional, Calvet, Marc, additional, Clark, Chris D., additional, Delmas, Magali, additional, Esteves, Mariana, additional, Fernandes, Marcelo, additional, Fernández-Fernández, José M., additional, García-Ruiz, José M., additional, Gibbard, Philip L., additional, Giraudi, Carlo, additional, Glasser, Neil F., additional, Greenwood, Sarah L., additional, Gunnell, Yanni, additional, Guobyte, Rimante, additional, Hjelstuen, Berit Oline, additional, Hughes, Anna L.C., additional, Hughes, Philip D., additional, Ivy-Ochs, Susan, additional, Johnson, Mark D., additional, Korsakova, Olga, additional, Kłapyta, Piotr, additional, Landais, Amaelle, additional, Lunkka, Juha Pekka, additional, Makos, Michał, additional, Mangerud, Jan, additional, Marks, Leszek, additional, Monegato, Giovanni, additional, Naughton, Filipa, additional, Nazarov, Dmitry, additional, Nosova, Olga, additional, Oliva, Marc, additional, Onaca, Alexandru, additional, Palacios, David, additional, Patton, Henry, additional, Pope, Richard J.J., additional, Regnéll, Carl, additional, Reitner, Jürgen M., additional, Reixach, Théo, additional, Ribolini, Adriano, additional, Rinterknecht, Vincent, additional, Riveiros, Natalia Vazquez, additional, Rodrigues, Teresa, additional, Sánchez-Goñi, María F., additional, Sejrup, Hans Petter, additional, Spagnolo, Matteo, additional, Svendsen, John Inge, additional, Tomkins, Matt D., additional, Toucanne, Samuel, additional, Tołoczko-Pasek, Anna, additional, Tylmann, Karol, additional, Urdea, Petru, additional, Vashkov, Andrey, additional, Winsborrow, Monica C.M., additional, Woodward, Jamie C., additional, and Zasadni, Jerzy, additional

Published
2023
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16. List of contributors

Author

Akçar, Naki, primary, Alexandropoulou, Nikolitsa, additional, Allard, James L., additional, Andrés, Nuria, additional, Ardelean, Florina, additional, Ardelean, Mircea, additional, Ásbjörnsdóttir, Lovísa, additional, Benediktsson, Ívar Örn, additional, Bitinas, Albertas, additional, Börner, Andreas, additional, Brynjólfsson, Skafti, additional, Błaszkiewicz, Mirosław, additional, Calvet, Marc, additional, Clark, Chris D., additional, Delmas, Magali, additional, Esteves, Mariana, additional, Fernández-Fernández, José M., additional, García-Ruiz, José M., additional, Gibbard, Philip L., additional, Giraudi, Carlo, additional, Glasser, Neil F., additional, Greenwood, Sarah L., additional, Gunnell, Yanni, additional, Guobyte, Rimante, additional, Hjelstuen, Berit Oline, additional, Hughes, Anna L.C., additional, Hughes, Philip D., additional, Ivy-Ochs, Susan, additional, Kałuża, Piotr, additional, Korsakova, Olga, additional, Kłapyta, Piotr, additional, Landais, Amaelle, additional, Makos, Michał, additional, Mangerud, Jan, additional, Marks, Leszek, additional, Monegato, Giovanni, additional, Naughton, Filipa, additional, Nazarov, Dmitry, additional, Nosova, Olga, additional, Oliva, Marc, additional, Onaca, Alexandru, additional, Palacios, David, additional, Patton, Henry, additional, Regnéll, Carl, additional, Reitner, Jürgen M., additional, Reixach, Théo, additional, Ribolini, Adriano, additional, Rinterknecht, Vincent, additional, Rodrigues, Teresa, additional, Sánchez Goñi, María Fernanda, additional, Sejrup, Hans Petter, additional, Spagnolo, Matteo, additional, Svendsen, John Inge, additional, Tomkins, Matt D., additional, Toucanne, Samuel, additional, Tylmann, Karol, additional, Urdea, Petru, additional, Vashkov, Andrey, additional, Vázquez-Riveiros, Natalia, additional, Winsborrow, Monica C.M., additional, Woodward, Jamie C., additional, and Zasadni, Jerzy, additional

Published
2022
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29. Cirque-like alcoves in the northern mid-latitudes of Mars as evidence of glacial erosion.

Author

Li, An, Koutnik, Michelle, Brough, Stephen, Spagnolo, Matteo, and Barr, Iestyn

Subjects
GLACIAL erosion, ROCK glaciers, MARS (Planet), VISCOUS flow, GLACIAL landforms, GLACIERS, GLACIATION
Abstract

While glacial remnants in the form of viscous flow features in the mid-latitudes of Mars are considered to be cold-based in the present-day, an increasing amount of geomorphic evidence suggests that at least some flow features were previously wet-based or had a mixed thermal state (polythermal) at during their evolution. Many of the viscous flow features known as glacier-like forms have been observed to emerge from alcoves that appear similar to cirques on Earth. Terrestrial cirques are typically characterized by a concave basin connected to a steep backwall. Cirques are expected to form from depressions in mountainsides that fill with snow/ice and over time support active glaciers that deepen the depressions by wet-based glacial erosion. To assess which alcoves on Mars are most "cirque-like", we mapped a population of ~2000 alcoves in Deuteronilus Mensae, a region in the mid-latitudes of Mars characterized by mesas encompassed by glacial remnants. Based on visual characteristics and morphometrics, we refined our dataset to 386 "cirque-like alcoves", which is five times the amount of glacier-like forms in the region, and used this to assess the past extent and style of glaciation on Mars. Using high resolution imagery, we find geomorphic evidence for glacial occupation associated with the cirque-like alcoves, including crevasse-like features, surface lineations, polygonal terrain, and moraine-like ridges. We propose that the cirque-like alcoves with icy remnants similar to rock glaciers on Earth represent a late stage of glacier-like form evolution. We also outline stages of cirque-like alcove evolution, linking a potential early stage of cirque-like alcoves to gully activity. On a population-wide scale, the cirque-like alcoves have a south to southeastward aspect bias, which may indicate a requirement for increased insolation for melting to occur and a connection to gullies on Mars. While the alcoves also have similarities to other features such as landslide scarps and amphitheater-headed valleys, the cirque-like alcoves have unique morphologies and morphometrics that differentiate their origin. Assuming warm-based erosion rates, the cirque-like alcoves have timescales consistent with both glacier-like forms and other viscous flow features like lobate debris aprons, whereas cold-based erosion rates would only allow the older timescales of lobate debris aprons. We propose that based on the geomorphic features and southward aspect, cirque-like alcove formation is more consistent with warm-based glaciation. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Icy thermometers: Quantifying the impact of volcanic heat on glacier elevation.

Author

Howcutt, Stephen, Spagnolo, Matteo, Rea, Brice R., Jaszewski, Jan, Barr, Iestyn, Coppola, Diego, De Siena, Luca, Girona, Társilo, Gomez-Patron, Andie, Mullan, Donal, and Pritchard, Matthew E.

Subjects
*ALTITUDES, *THERMOMETERS, *GLACIERS, *VOLCANOES, *EQUILIBRIUM
Abstract

We present a continentwide study of 600 glaciers located on and near 37 ice-clad volcanoes in South America. Results demonstrate glacier sensitivity to volcanic heat. We distinguished between "volcanic glaciers" (≤1 km from volcanic centers; n = 74), and "proximal glaciers" (1-15 km; n = 526) and calculated their equilibrium line altitudes (ELAs). For each ice-clad volcano, we compared the ELAs of its volcanic glaciers to those of its proximal glaciers, which showed that the ELAs of the former are higher than the ELAs of the latter. ΔELAmean, defined as the offset between the mean ELA of the volcanic glaciers compared with that of the proximal glaciers, was calculated for each ice-clad volcano. ΔELAmean was positive for 92% of the 37 volcanoes, and a quantitative relationship between ΔELAmean and volcanic thermal anomaly was established. Results highlight the impact of volcanic heat on glacier elevation; emphasize the need to exclude glaciers on, or near, volcanoes from glacier-climate investigations; and demonstrate the first-order potential for glaciers as "volcanic thermometers." Volcanic-glacier monitoring could contribute to our understanding of magmatic and thermal activity, with changes in glacier geometries potentially reflecting long-term fluctuations in volcanic heat and unrest. [ABSTRACT FROM AUTHOR]

Published
2023
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35. The evolution and preservation potential of englacial eskers: an example from Breiðamerkurjökull, SE Iceland

Author

Lally, Amy, Ruffell, Alastair, Newton, Andrew M. W., Rea, Brice R., Kahlert, Thorsten, Storrar, Robert D., Spagnolo, Matteo, Graham, Conor, and Coleman, Millie

Abstract

Directly observing glacial drainage systems (englacial and subglacial) is challenging. The distribution, morphology and internal structure of eskers can provide valuable information about the glacial drainage system and meltwater processes. This work presents the annual evolution (meltout) and internal structure of an esker emerging from the Breiðamerkurjökull ice margin, southeast Iceland. Changes in esker morphology have been repeatedly mapped over a 1-year period using high temporal and spatial resolution data acquired by an uncrewed aerial vehicle (UAV). The internal architecture of the esker was investigated using ground-penetrating radar (GPR) surveys. These data are used to identify the dominant processes driving the formation of this englacial esker and to evaluate the preservation potential. The englacial esker was up to 2.6 m thick and ice-cored. A large moulin upglacier of the esker, which evolved into an englacial conduit, supplied meltwater to the englacial channel. Upglacier dipping debris-filled basal hydrofractures, formed by pressurised subglacial meltwater rising up the retrograde bed slope, likely supplied sediment to the englacial conduit. Over the 1-year period of observation the crest morphology evolved from flat- to sharp-crested and the esker footprint increased by a factor of 5.7 in response to post-depositional processes. The findings presented here indicate that englacial eskers may have low preservation potential due to post-depositional reworking such as slumping through ice-core meltout and erosion by later meltwater flow. As englacial eskers may not be preserved in the landscape, they could represent important glacial drainage system components that are not currently captured in palaeo-ice sheet reconstructions. This work highlights the value of creating a time series of high-temporal resolution data to quantify morphological evolution and improve glacial process-form models.

Published
2023

36. 94 GHz Radar Backscatter Characteristics of Alpine Glacier Ice

Author

Harcourt, William D., Robertson, Duncan A., Macfarlane, David G., Rea, Brice R., and Spagnolo, Matteo

Subjects
Point Clouds, Radar Backscatter, Normalised Radar Cross Section, Millimetre-wave Radar, Alpine Glacier
Abstract

Measuring the radar backscatter characteristics of glacier ice at different frequencies and incidence angles is fundamental to predicting the glacier mapping performance of a sensor. However, such measurements at 94 GHz do not exist. To address this knowledge gap, we collected 94 GHz radar backscatter data from the surface of Rhônegletscher in Switzerland using the 2nd generation All-weather Volcano Topography Imaging Sensor (AVTIS2). We determine the mean normalised radar cross section \(\left(\sigma^0_{\text{mean}}\right)\) to be -9.9 dB. The distribution closely follows a log-normal distribution with a high goodness of fit (R2=0.99) which suggests that radar backscatter is diffuse and driven by surface roughness. Further, we quantified the uncertainty of AVTIS2 3D point clouds to be 1.30-3.72 m, which is smaller than other ground-based glacier surface mapping radars. These results demonstrate that glacier surfaces are an efficient scattering target at 94 GHz, hence demonstrating the suitability of millimeter-wave radar for glacier monitoring.

Published
2023
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41. Glacier monitoring using real-aperture 94 GHz radar.

Author

Harcourt, William D., Robertson, Duncan A., Macfarlane, David G., Rea, Brice R., Spagnolo, Matteo, Benn, Douglas I., and James, Mike R.

Subjects
ICE calving, RADAR, OPTICAL instruments, GLACIAL lakes, GLACIERS, WEATHER
Abstract

Close-range sensors are employed to observe glaciological processes that operate over short timescales (e.g. iceberg calving, glacial lake outburst floods, diurnal surface melting). However, under poor weather conditions optical instruments fail while the operation of radar systems below 17 GHz do not have sufficient angular resolution to map glacier surfaces in detail. This letter reviews the potential of millimetre-wave radar at 94 GHz to obtain high-resolution 3-D measurements of glaciers under most weather conditions. We discuss the theory of 94 GHz radar for glaciology studies, demonstrate its potential to map a glacier calving front and summarise future research priorities. [ABSTRACT FROM AUTHOR]

Published
2023
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43. Icy thermometers: how volcanic heat affects glacier mass balance

Author

Spagnolo, Matteo, primary, Howcutt, Stephen, additional, Rea, Brice, additional, Jaszewski, Jan, additional, Barr, Iestyn, additional, Coppola, Diego, additional, de Siena, Luca, additional, Girona, Társilo, additional, Gomez-Patron, Andie, additional, Mullan, Donal, additional, and Pritchard, Matthew, additional

Published
2023
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