Global IWV trends and variability in atmospheric reanalyses and GPS observations
International audience This study investigates the means, variability, and trends in integrated water vapour (IWV) from two modern reanalyses (ERA-Interim and MERRA-2) from 1980 to 2016 and ground-based GPS data from 1995 to 2010. It is found that the mean distributions and inter-annual variability...
Published in: | Atmospheric Chemistry and Physics |
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Main Authors: | , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999/document https://hal-insu.archives-ouvertes.fr/insu-01708999/file/acp-18-16213-2018.pdf https://doi.org/10.5194/acp-18-16213-2018 |
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English |
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[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
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[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Parracho, Ana Claudia Bock, Olivier Bastin, Sophie Global IWV trends and variability in atmospheric reanalyses and GPS observations |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience This study investigates the means, variability, and trends in integrated water vapour (IWV) from two modern reanalyses (ERA-Interim and MERRA-2) from 1980 to 2016 and ground-based GPS data from 1995 to 2010. It is found that the mean distributions and inter-annual variability in IWV in the reanalyses and GPS are consistent, even in regions of strong gradients. ERA-Interim is shown to exhibit a slight moist bias in the extra-tropics and a slight dry bias in the tropics (both on the order of 0.5 to 1 kgm −2 ) compared to GPS. ERA-Interim is also generally drier than MERRA-2 over the ocean and within the tropics. Differences in variability and trends are pointed out at a few GPS sites. These differences can be due to representativeness errors (for sites located in coastal regions and regions of complex topography), gaps and inhomogeneities in the GPS series (due to equipment changes), or potential inhomogeneities in the reanalyses (due to changes in the observing system). Trends in IWV and surface temperature in ERA-Interim and MERRA-2 are shown to be consistent, with positive IWV trends generally correlated with surface warming, but MERRA-2 presents a more general global moistening trend compared to ERA-Interim. Inconsistent trends are found between the two reanalyses over Antarctica and most of the Southern Hemisphere, and over central and northern Africa. The uncertainty in current reanalyses remains quite high in these regions, where few in situ observations are available, and the spread between models is generally important. Inter-annual and decadal variations in IWV are also shown to be strongly linked with variations in the atmospheric circulation, especially in arid regions, such as northern Africa and Western Australia, which add uncertainty in the trend estimates, especially over the shorter period. In these regions, the Clausius–Clapeyron scaling ratio is found not to be a good humidity proxy for inter-annual variability and decadal trends. |
author2 |
LAboratoire de REcherche en Géodésie Paris (LAREG) Laboratoire des Sciences et Technologies de l'Information Géographique (LaSTIG) École nationale des sciences géographiques (ENSG) Institut National de l'Information Géographique et Forestière IGN (IGN)-Institut National de l'Information Géographique et Forestière IGN (IGN)-École nationale des sciences géographiques (ENSG) Institut National de l'Information Géographique et Forestière IGN (IGN)-Institut National de l'Information Géographique et Forestière IGN (IGN) SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) Centre National de la Recherche Scientifique (LEFE/INSU) Agence Nationale de la Recherche (ANR) ANR-12-SENV-0001,REMEMBER,Compréhension et modélisation du système climatique régional couplé pour la prévention des risques hydrométéorologiques en Méditerranée dans un contexte de changement global(2012) |
format |
Article in Journal/Newspaper |
author |
Parracho, Ana Claudia Bock, Olivier Bastin, Sophie |
author_facet |
Parracho, Ana Claudia Bock, Olivier Bastin, Sophie |
author_sort |
Parracho, Ana Claudia |
title |
Global IWV trends and variability in atmospheric reanalyses and GPS observations |
title_short |
Global IWV trends and variability in atmospheric reanalyses and GPS observations |
title_full |
Global IWV trends and variability in atmospheric reanalyses and GPS observations |
title_fullStr |
Global IWV trends and variability in atmospheric reanalyses and GPS observations |
title_full_unstemmed |
Global IWV trends and variability in atmospheric reanalyses and GPS observations |
title_sort |
global iwv trends and variability in atmospheric reanalyses and gps observations |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999/document https://hal-insu.archives-ouvertes.fr/insu-01708999/file/acp-18-16213-2018.pdf https://doi.org/10.5194/acp-18-16213-2018 |
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ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Merra |
geographic_facet |
Merra |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal-insu.archives-ouvertes.fr/insu-01708999 Atmospheric Chemistry and Physics, European Geosciences Union, 2018, 18 (22), pp.16213-16237. ⟨10.5194/acp-18-16213-2018⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-18-16213-2018 insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999/document https://hal-insu.archives-ouvertes.fr/insu-01708999/file/acp-18-16213-2018.pdf doi:10.5194/acp-18-16213-2018 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-18-16213-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
22 |
container_start_page |
16213 |
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ftccsdartic:oai:HAL:insu-01708999v1 2023-05-15T13:37:17+02:00 Global IWV trends and variability in atmospheric reanalyses and GPS observations Parracho, Ana Claudia Bock, Olivier Bastin, Sophie LAboratoire de REcherche en Géodésie Paris (LAREG) Laboratoire des Sciences et Technologies de l'Information Géographique (LaSTIG) École nationale des sciences géographiques (ENSG) Institut National de l'Information Géographique et Forestière IGN (IGN)-Institut National de l'Information Géographique et Forestière IGN (IGN)-École nationale des sciences géographiques (ENSG) Institut National de l'Information Géographique et Forestière IGN (IGN)-Institut National de l'Information Géographique et Forestière IGN (IGN) SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) Centre National de la Recherche Scientifique (LEFE/INSU) Agence Nationale de la Recherche (ANR) ANR-12-SENV-0001,REMEMBER,Compréhension et modélisation du système climatique régional couplé pour la prévention des risques hydrométéorologiques en Méditerranée dans un contexte de changement global(2012) 2018 https://hal-insu.archives-ouvertes.fr/insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999/document https://hal-insu.archives-ouvertes.fr/insu-01708999/file/acp-18-16213-2018.pdf https://doi.org/10.5194/acp-18-16213-2018 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-18-16213-2018 insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999 https://hal-insu.archives-ouvertes.fr/insu-01708999/document https://hal-insu.archives-ouvertes.fr/insu-01708999/file/acp-18-16213-2018.pdf doi:10.5194/acp-18-16213-2018 info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal-insu.archives-ouvertes.fr/insu-01708999 Atmospheric Chemistry and Physics, European Geosciences Union, 2018, 18 (22), pp.16213-16237. ⟨10.5194/acp-18-16213-2018⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.5194/acp-18-16213-2018 2021-12-05T02:29:43Z International audience This study investigates the means, variability, and trends in integrated water vapour (IWV) from two modern reanalyses (ERA-Interim and MERRA-2) from 1980 to 2016 and ground-based GPS data from 1995 to 2010. It is found that the mean distributions and inter-annual variability in IWV in the reanalyses and GPS are consistent, even in regions of strong gradients. ERA-Interim is shown to exhibit a slight moist bias in the extra-tropics and a slight dry bias in the tropics (both on the order of 0.5 to 1 kgm −2 ) compared to GPS. ERA-Interim is also generally drier than MERRA-2 over the ocean and within the tropics. Differences in variability and trends are pointed out at a few GPS sites. These differences can be due to representativeness errors (for sites located in coastal regions and regions of complex topography), gaps and inhomogeneities in the GPS series (due to equipment changes), or potential inhomogeneities in the reanalyses (due to changes in the observing system). Trends in IWV and surface temperature in ERA-Interim and MERRA-2 are shown to be consistent, with positive IWV trends generally correlated with surface warming, but MERRA-2 presents a more general global moistening trend compared to ERA-Interim. Inconsistent trends are found between the two reanalyses over Antarctica and most of the Southern Hemisphere, and over central and northern Africa. The uncertainty in current reanalyses remains quite high in these regions, where few in situ observations are available, and the spread between models is generally important. Inter-annual and decadal variations in IWV are also shown to be strongly linked with variations in the atmospheric circulation, especially in arid regions, such as northern Africa and Western Australia, which add uncertainty in the trend estimates, especially over the shorter period. In these regions, the Clausius–Clapeyron scaling ratio is found not to be a good humidity proxy for inter-annual variability and decadal trends. Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Merra ENVELOPE(12.615,12.615,65.816,65.816) Atmospheric Chemistry and Physics 18 22 16213 16237 |