The role of water vapor on the hydrologic cycle in the polar regions
Atmospheric water vapour plays a key role in the Arctic radiation budget, hydrological cycle and hence climate, but its measurement with high accuracy remains an important challenge. Arctic water vapor is characterized by a spatial and temporal variability which is not completely understood yet. Its...
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ftinsu:oai:HAL:tel-01729340v1 2023-11-05T03:31:24+01:00 The role of water vapor on the hydrologic cycle in the polar regions Rôle de la vapeur d'eau dans le cycle hydrologique en Arctique Alraddawi, Dunya SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Université Paris Saclay (COmUE) Alain Sarkissian Philippe Keckhut 2017-12-19 https://theses.hal.science/tel-01729340 https://theses.hal.science/tel-01729340/document https://theses.hal.science/tel-01729340/file/76266_ALRADDAWI_2017_archivage.pdf fr fre HAL CCSD NNT: 2017SACLV094 tel-01729340 https://theses.hal.science/tel-01729340 https://theses.hal.science/tel-01729340/document https://theses.hal.science/tel-01729340/file/76266_ALRADDAWI_2017_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01729340 Climatologie. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLV094⟩ Water vapor Arctic Water cycle Trends Satellite Gps Climate change Uncertainties Incertitudes Tendances Vapeur d'eau Arctique Cycle d'eau Changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/doctoralThesis Theses 2017 ftinsu 2023-10-11T16:38:42Z Atmospheric water vapour plays a key role in the Arctic radiation budget, hydrological cycle and hence climate, but its measurement with high accuracy remains an important challenge. Arctic water vapor is characterized by a spatial and temporal variability which is not completely understood yet. Its mass integrated in the atmospheric column (TCWV) is studied in this thesis. TCWV seasonal cycle at 18 polar stations is examined following the effect of latitude, longitude in addition to the continental effect. The measurements used in this thesis were validated at three polar stations, the satellites measurements of TCWV in the NIR/VIS/IR bands by MODIS/ SCIAMACHY/ AIRS sensors are compared to those obtained from ground based GPS signals delay. Their uncertainties and limitations are evaluated in season and month scales especially their sensitivities to the clouds presence. In NIR and VIS, the measurements undergo increased sensitivity to the presence of clouds at high latitudes in summer. In addition, albedo estimation is still a challenge to their TCWV inversion models, especially where canopies are snow-covered. Following the validation results, the distribution and seasonal trends of the TCWV over the entire Arctic was assessed via MODIS. Trends and anomalies are discussed mainly in response to changes in the Arctic vegetation, snow cover, and sea ice during 2001-2015. Increased trends in TCWV may be related to local increase of vegetated areas coincidently to snow cover decrease during transient seasons. Increased trends in TCWV were observed by MODIS, forced by local summer warming from many warm waves. A dramatic decline in sea ice near the Siberian and Beaufort coasts led to an observed local increase in TCWV in early fall. A warm-up phase in the Svalbard archipelago, persisting in all seasons except summer, also resulted in additional quantities of TCWV. The detection and justification of trends is a task still far from being accomplished. Arctic TCWV measurements are in question, TCWV measurements over ... Doctoral or Postdoctoral Thesis albedo Arctic Arctique* Climate change Sea ice Svalbard Institut national des sciences de l'Univers: HAL-INSU |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
French |
topic |
Water vapor Arctic Water cycle Trends Satellite Gps Climate change Uncertainties Incertitudes Tendances Vapeur d'eau Arctique Cycle d'eau Changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Water vapor Arctic Water cycle Trends Satellite Gps Climate change Uncertainties Incertitudes Tendances Vapeur d'eau Arctique Cycle d'eau Changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Alraddawi, Dunya The role of water vapor on the hydrologic cycle in the polar regions |
topic_facet |
Water vapor Arctic Water cycle Trends Satellite Gps Climate change Uncertainties Incertitudes Tendances Vapeur d'eau Arctique Cycle d'eau Changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
Atmospheric water vapour plays a key role in the Arctic radiation budget, hydrological cycle and hence climate, but its measurement with high accuracy remains an important challenge. Arctic water vapor is characterized by a spatial and temporal variability which is not completely understood yet. Its mass integrated in the atmospheric column (TCWV) is studied in this thesis. TCWV seasonal cycle at 18 polar stations is examined following the effect of latitude, longitude in addition to the continental effect. The measurements used in this thesis were validated at three polar stations, the satellites measurements of TCWV in the NIR/VIS/IR bands by MODIS/ SCIAMACHY/ AIRS sensors are compared to those obtained from ground based GPS signals delay. Their uncertainties and limitations are evaluated in season and month scales especially their sensitivities to the clouds presence. In NIR and VIS, the measurements undergo increased sensitivity to the presence of clouds at high latitudes in summer. In addition, albedo estimation is still a challenge to their TCWV inversion models, especially where canopies are snow-covered. Following the validation results, the distribution and seasonal trends of the TCWV over the entire Arctic was assessed via MODIS. Trends and anomalies are discussed mainly in response to changes in the Arctic vegetation, snow cover, and sea ice during 2001-2015. Increased trends in TCWV may be related to local increase of vegetated areas coincidently to snow cover decrease during transient seasons. Increased trends in TCWV were observed by MODIS, forced by local summer warming from many warm waves. A dramatic decline in sea ice near the Siberian and Beaufort coasts led to an observed local increase in TCWV in early fall. A warm-up phase in the Svalbard archipelago, persisting in all seasons except summer, also resulted in additional quantities of TCWV. The detection and justification of trends is a task still far from being accomplished. Arctic TCWV measurements are in question, TCWV measurements over ... |
author2 |
SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Université Paris Saclay (COmUE) Alain Sarkissian Philippe Keckhut |
format |
Doctoral or Postdoctoral Thesis |
author |
Alraddawi, Dunya |
author_facet |
Alraddawi, Dunya |
author_sort |
Alraddawi, Dunya |
title |
The role of water vapor on the hydrologic cycle in the polar regions |
title_short |
The role of water vapor on the hydrologic cycle in the polar regions |
title_full |
The role of water vapor on the hydrologic cycle in the polar regions |
title_fullStr |
The role of water vapor on the hydrologic cycle in the polar regions |
title_full_unstemmed |
The role of water vapor on the hydrologic cycle in the polar regions |
title_sort |
role of water vapor on the hydrologic cycle in the polar regions |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://theses.hal.science/tel-01729340 https://theses.hal.science/tel-01729340/document https://theses.hal.science/tel-01729340/file/76266_ALRADDAWI_2017_archivage.pdf |
genre |
albedo Arctic Arctique* Climate change Sea ice Svalbard |
genre_facet |
albedo Arctic Arctique* Climate change Sea ice Svalbard |
op_source |
https://theses.hal.science/tel-01729340 Climatologie. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLV094⟩ |
op_relation |
NNT: 2017SACLV094 tel-01729340 https://theses.hal.science/tel-01729340 https://theses.hal.science/tel-01729340/document https://theses.hal.science/tel-01729340/file/76266_ALRADDAWI_2017_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1781708197964283904 |