Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data
Quantifying the mass balance of the Antarctic Ice Sheet (AIS), and the resulting sea level rise, requires an understanding of inter-annual variability and associated causal mechanisms. This has become more complex and challenging in the backdrop of global climate change. Very few studies have been e...
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ftunivcotedazur:oai:HAL:tel-03644306v1 2023-10-09T21:47:03+02:00 Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data Caractérisation des variations de masse en Antarctique en réponse aux fluctuations climatiques à partir des données de gravimétrie spatiale et d'altimétrie radar Kaitheri, Athul Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Université Côte d'Azur Anthony Mémin Frédérique Rémy 2021-12-02 https://theses.hal.science/tel-03644306 https://theses.hal.science/tel-03644306/document https://theses.hal.science/tel-03644306/file/2021COAZ4100.pdf en eng HAL CCSD NNT: 2021COAZ4100 tel-03644306 https://theses.hal.science/tel-03644306 https://theses.hal.science/tel-03644306/document https://theses.hal.science/tel-03644306/file/2021COAZ4100.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03644306 Earth Sciences. Université Côte d'Azur, 2021. English. ⟨NNT : 2021COAZ4100⟩ Antarctic Ice Sheet GRACE Envisat RACMO2.3p2 Firn compaction model ENSO ACW Calotte polaire de l’Antarctique Modèle de compaction Oscillation australe et onde circumpolaire [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/doctoralThesis Theses 2021 ftunivcotedazur 2023-09-12T23:04:13Z Quantifying the mass balance of the Antarctic Ice Sheet (AIS), and the resulting sea level rise, requires an understanding of inter-annual variability and associated causal mechanisms. This has become more complex and challenging in the backdrop of global climate change. Very few studies have been exploring the influence of climate anomalies on the AIS and only a vague estimate of its impact is available. Usually changes to the ice sheet are quantified using observations from space-borne altimetry and gravimetry missions. In this study, we use data from Envisat (2002 to 2010) and Gravity Recovery and Climate Experiment (GRACE) (2002 to 2016) missions to estimate monthly elevation changes and mass changes, respectively. Similar estimates of the changes are made using weather variables (surface mass balance (SMB) and temperature) from a regional climate model (RACMO2.3p2) as inputs to a firn compaction (FC) model. Using the firn compaction model we were able to model the transformation of snow into glacial ice and hence estimate changes in the elevation of the ice sheet using climate parameters.Elevation changes estimated from different techniques are in good agreement with each other across the AIS especially in West Antarctica, Antarctic Peninsula, and along the coasts of East Antarctica. Inter-annual height change patterns are then extracted using for the first time an empirical mode decomposition followed by a reconstruction of modes. These signal on applying least square method revealed a sub-4-year periodic signal in the all the three distinct height change patterns. This was indicative of the influence of the El Niño Southern Oscillation (ENSO), a climate anomaly that alters, among other parameters, moisture transport, sea surface temperature, precipitation, in and around the AIS at similar frequency by alternating between warm and cold conditions. But there existed altering periodic behavior among inter annual height change patterns in the Antarctic Pacific (AP) sector which was found possibly by the ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctic Peninsula Antarctica Antarctique* East Antarctica Ice Sheet West Antarctica HAL Université Côte d'Azur Antarctic Antarctic Peninsula East Antarctica Pacific The Antarctic West Antarctica |
institution |
Open Polar |
collection |
HAL Université Côte d'Azur |
op_collection_id |
ftunivcotedazur |
language |
English |
topic |
Antarctic Ice Sheet GRACE Envisat RACMO2.3p2 Firn compaction model ENSO ACW Calotte polaire de l’Antarctique Modèle de compaction Oscillation australe et onde circumpolaire [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
Antarctic Ice Sheet GRACE Envisat RACMO2.3p2 Firn compaction model ENSO ACW Calotte polaire de l’Antarctique Modèle de compaction Oscillation australe et onde circumpolaire [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Kaitheri, Athul Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
topic_facet |
Antarctic Ice Sheet GRACE Envisat RACMO2.3p2 Firn compaction model ENSO ACW Calotte polaire de l’Antarctique Modèle de compaction Oscillation australe et onde circumpolaire [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
Quantifying the mass balance of the Antarctic Ice Sheet (AIS), and the resulting sea level rise, requires an understanding of inter-annual variability and associated causal mechanisms. This has become more complex and challenging in the backdrop of global climate change. Very few studies have been exploring the influence of climate anomalies on the AIS and only a vague estimate of its impact is available. Usually changes to the ice sheet are quantified using observations from space-borne altimetry and gravimetry missions. In this study, we use data from Envisat (2002 to 2010) and Gravity Recovery and Climate Experiment (GRACE) (2002 to 2016) missions to estimate monthly elevation changes and mass changes, respectively. Similar estimates of the changes are made using weather variables (surface mass balance (SMB) and temperature) from a regional climate model (RACMO2.3p2) as inputs to a firn compaction (FC) model. Using the firn compaction model we were able to model the transformation of snow into glacial ice and hence estimate changes in the elevation of the ice sheet using climate parameters.Elevation changes estimated from different techniques are in good agreement with each other across the AIS especially in West Antarctica, Antarctic Peninsula, and along the coasts of East Antarctica. Inter-annual height change patterns are then extracted using for the first time an empirical mode decomposition followed by a reconstruction of modes. These signal on applying least square method revealed a sub-4-year periodic signal in the all the three distinct height change patterns. This was indicative of the influence of the El Niño Southern Oscillation (ENSO), a climate anomaly that alters, among other parameters, moisture transport, sea surface temperature, precipitation, in and around the AIS at similar frequency by alternating between warm and cold conditions. But there existed altering periodic behavior among inter annual height change patterns in the Antarctic Pacific (AP) sector which was found possibly by the ... |
author2 |
Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Université Côte d'Azur Anthony Mémin Frédérique Rémy |
format |
Doctoral or Postdoctoral Thesis |
author |
Kaitheri, Athul |
author_facet |
Kaitheri, Athul |
author_sort |
Kaitheri, Athul |
title |
Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
title_short |
Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
title_full |
Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
title_fullStr |
Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
title_full_unstemmed |
Characterization of mass variations in Antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
title_sort |
characterization of mass variations in antarctica in response to climatic fluctuations from space-based gravimetry and radar altimetry data |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://theses.hal.science/tel-03644306 https://theses.hal.science/tel-03644306/document https://theses.hal.science/tel-03644306/file/2021COAZ4100.pdf |
geographic |
Antarctic Antarctic Peninsula East Antarctica Pacific The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula East Antarctica Pacific The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Antarctique* East Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Antarctique* East Antarctica Ice Sheet West Antarctica |
op_source |
https://theses.hal.science/tel-03644306 Earth Sciences. Université Côte d'Azur, 2021. English. ⟨NNT : 2021COAZ4100⟩ |
op_relation |
NNT: 2021COAZ4100 tel-03644306 https://theses.hal.science/tel-03644306 https://theses.hal.science/tel-03644306/document https://theses.hal.science/tel-03644306/file/2021COAZ4100.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1779309760072384512 |