Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events
The IASI instruments, launched in 2006, 2012 and 2018, observe radiance spectra from the Earth-atmosphere system, allowing us to retrieve atmospheric temperatures. The EUropean organisation for the exploitation of METeorological SATellites (EUMETSAT) computes surface and atmospheric temperatures fro...
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Online Access: | https://theses.hal.science/tel-03688289 https://theses.hal.science/tel-03688289/document https://theses.hal.science/tel-03688289/file/BOUILLON_Marie_2021.pdf |
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ftsorbonneuniv:oai:HAL:tel-03688289v1 2024-06-16T07:38:27+00:00 Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events Températures atmosphériques homogènes dérivées des observations satellitaires IASI : restitution, variations spatio-temporelles et événements extrêmes Bouillon, Marie TROPO - 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) Sorbonne Université Cathy Clerbaux Sarah Safieddine 2021-12-02 https://theses.hal.science/tel-03688289 https://theses.hal.science/tel-03688289/document https://theses.hal.science/tel-03688289/file/BOUILLON_Marie_2021.pdf fr fre HAL CCSD NNT: 2021SORUS317 tel-03688289 https://theses.hal.science/tel-03688289 https://theses.hal.science/tel-03688289/document https://theses.hal.science/tel-03688289/file/BOUILLON_Marie_2021.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03688289 Climatologie. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS317⟩ IASI Atmospheric temperature Climate change Extreme events Trends Remote sensing Températures atmosphériques Changement climatique Événements extrêmes Tendances Télédétection [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/doctoralThesis Theses 2021 ftsorbonneuniv 2024-05-23T23:47:40Z The IASI instruments, launched in 2006, 2012 and 2018, observe radiance spectra from the Earth-atmosphere system, allowing us to retrieve atmospheric temperatures. The EUropean organisation for the exploitation of METeorological SATellites (EUMETSAT) computes surface and atmospheric temperatures from IASI observations since 2007. To improve the quality of the retrieved temperatures, EUMETSAT has performed several updates on the temperature processing algorithm. In this work, we show how the EUMETSAT temperature record is inhomogeneous and therefore not adapted to the study of temperatures on the long term. Therefore, a new atmospheric temperature product was computed from IASI spectra with an artificial neural network, using IASI radiances as input and ERA5 reanalysis temperatures as output. The temperatures retrieved with the neural network were validated against ERA5 temperatures and radiosounding temperatures. The validation showed good agreement between the three datasets from 750 to 7 hPa. At 2 hPa, the quality of the temperature products decreases because of the low amount of information on temperature within the IASI spectra at this altitude. This new homogeneous temperature record was then used to study extreme events, in particular Sudden Stratospheric Warmings (SSW). This work studies several SSWs that have happened since 2007, and shows that IASI is perfectly suited to study both temperature and ozone changes during these events. The temperatures were also used to observe the cold and heat waves that happened in the past few years. Finally, the temperatures were used to compute trends over the 2008-2020 period. The troposphere is warming, especially in the upper equatorial troposphere and in the Arctic. The stratosphere north of 50°S is also warming due to the slow ozone hole recovery. In the rest of the stratosphere, the temperatures are decreasing. This thesis presents an homogenous and independent temperature data record from IASI. The methods developed can and will be applied to the rest of the ... Doctoral or Postdoctoral Thesis Arctic Climate change HAL Sorbonne Université Arctic |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
French |
topic |
IASI Atmospheric temperature Climate change Extreme events Trends Remote sensing Températures atmosphériques Changement climatique Événements extrêmes Tendances Télédétection [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
IASI Atmospheric temperature Climate change Extreme events Trends Remote sensing Températures atmosphériques Changement climatique Événements extrêmes Tendances Télédétection [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Bouillon, Marie Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events |
topic_facet |
IASI Atmospheric temperature Climate change Extreme events Trends Remote sensing Températures atmosphériques Changement climatique Événements extrêmes Tendances Télédétection [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
The IASI instruments, launched in 2006, 2012 and 2018, observe radiance spectra from the Earth-atmosphere system, allowing us to retrieve atmospheric temperatures. The EUropean organisation for the exploitation of METeorological SATellites (EUMETSAT) computes surface and atmospheric temperatures from IASI observations since 2007. To improve the quality of the retrieved temperatures, EUMETSAT has performed several updates on the temperature processing algorithm. In this work, we show how the EUMETSAT temperature record is inhomogeneous and therefore not adapted to the study of temperatures on the long term. Therefore, a new atmospheric temperature product was computed from IASI spectra with an artificial neural network, using IASI radiances as input and ERA5 reanalysis temperatures as output. The temperatures retrieved with the neural network were validated against ERA5 temperatures and radiosounding temperatures. The validation showed good agreement between the three datasets from 750 to 7 hPa. At 2 hPa, the quality of the temperature products decreases because of the low amount of information on temperature within the IASI spectra at this altitude. This new homogeneous temperature record was then used to study extreme events, in particular Sudden Stratospheric Warmings (SSW). This work studies several SSWs that have happened since 2007, and shows that IASI is perfectly suited to study both temperature and ozone changes during these events. The temperatures were also used to observe the cold and heat waves that happened in the past few years. Finally, the temperatures were used to compute trends over the 2008-2020 period. The troposphere is warming, especially in the upper equatorial troposphere and in the Arctic. The stratosphere north of 50°S is also warming due to the slow ozone hole recovery. In the rest of the stratosphere, the temperatures are decreasing. This thesis presents an homogenous and independent temperature data record from IASI. The methods developed can and will be applied to the rest of the ... |
author2 |
TROPO - 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) Sorbonne Université Cathy Clerbaux Sarah Safieddine |
format |
Doctoral or Postdoctoral Thesis |
author |
Bouillon, Marie |
author_facet |
Bouillon, Marie |
author_sort |
Bouillon, Marie |
title |
Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events |
title_short |
Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events |
title_full |
Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events |
title_fullStr |
Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events |
title_full_unstemmed |
Homogeneous atmospheric temperatures derived from IASI satellite observations : retrieval, space-time variations and extreme events |
title_sort |
homogeneous atmospheric temperatures derived from iasi satellite observations : retrieval, space-time variations and extreme events |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://theses.hal.science/tel-03688289 https://theses.hal.science/tel-03688289/document https://theses.hal.science/tel-03688289/file/BOUILLON_Marie_2021.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
https://theses.hal.science/tel-03688289 Climatologie. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS317⟩ |
op_relation |
NNT: 2021SORUS317 tel-03688289 https://theses.hal.science/tel-03688289 https://theses.hal.science/tel-03688289/document https://theses.hal.science/tel-03688289/file/BOUILLON_Marie_2021.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1802005112348999680 |