Impacts of a revised surface roughness parameterization in the Community Land Model 5.1
International audience The roughness of the land surface (z 0 ) is a key property, exerting significant influence on the amount of near-surface turbulent activity and consequently the turbulent exchange of energy, water, momentum, and chemical species between the land and the atmosphere. Variations...
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ftsorbonneuniv:oai:HAL:insu-03717122v1 2024-05-19T07:31:48+00:00 Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 Meier, Ronny Davin, Edouard L. Bonan, Gordon B. Lawrence, David M. Hu, Xiaolong Duveiller, Gregory Prigent, Catherine Seneviratne, Sonia I. Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université de Cergy Pontoise (UCP) Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS) 2022 https://insu.hal.science/insu-03717122 https://insu.hal.science/insu-03717122/document https://insu.hal.science/insu-03717122/file/gmd-15-2365-2022.pdf https://doi.org/10.5194/gmd-15-2365-2022 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/gmd-15-2365-2022 insu-03717122 https://insu.hal.science/insu-03717122 https://insu.hal.science/insu-03717122/document https://insu.hal.science/insu-03717122/file/gmd-15-2365-2022.pdf BIBCODE: 2022GMD.15.2365M doi:10.5194/gmd-15-2365-2022 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1991-9603 EISSN: 1991-959X Geoscientific Model Development https://insu.hal.science/insu-03717122 Geoscientific Model Development, 2022, 15, pp.2365-2393. ⟨10.5194/gmd-15-2365-2022⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftsorbonneuniv https://doi.org/10.5194/gmd-15-2365-2022 2024-04-25T03:53:35Z International audience The roughness of the land surface (z 0 ) is a key property, exerting significant influence on the amount of near-surface turbulent activity and consequently the turbulent exchange of energy, water, momentum, and chemical species between the land and the atmosphere. Variations in z 0 are substantial across different types of land cover, ranging from typically less than 1 mm over fresh snow or sand deserts up to more than 1 m over urban areas or forests. In this study, we revise the parameterizations and parameter choices related to z 0 in the Community Land Model 5.1 (CLM), the land component of the Community Earth System Model (CESM). We propose a number modifications for z 0 in CLM, guided by observational data. Most importantly, we find that the observations support an increase in z 0 for all types of forests and a decrease in the momentum z 0 for bare soil, snow, glaciers, and crops. We then assess the effect of those modifications in land-only and land-atmosphere coupled simulations. With the revised parameterizations, diurnal variations of the land surface temperature (LST) are dampened in forested regions and are amplified over warm deserts. These changes mitigate model biases compared to MODerate resolution Imaging Spectroradiometer (MODIS) remote sensing observations. The changes in LST are generally stronger during the day than at night. For example, the LST increases by 5.1 K at 13:30 local solar time but only by 0.6 K at 01:30 during boreal summer across the entire Sahara. The induced changes in the diurnal variability of near-surface air temperatures are generally of the opposite sign and of smaller magnitude. Near-surface winds accelerate in areas where the momentum z 0 was lowered, such as the Sahara, the Middle East, and Antarctica, and decelerate in regions with forests. Overall, this study finds that the current representation of z 0 in CLM is not in agreement with observational constraints for several types of land cover. The proposed model modifications are shown to ... Article in Journal/Newspaper Antarc* Antarctica HAL Sorbonne Université Geoscientific Model Development 15 6 2365 2393 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Meier, Ronny Davin, Edouard L. Bonan, Gordon B. Lawrence, David M. Hu, Xiaolong Duveiller, Gregory Prigent, Catherine Seneviratne, Sonia I. Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The roughness of the land surface (z 0 ) is a key property, exerting significant influence on the amount of near-surface turbulent activity and consequently the turbulent exchange of energy, water, momentum, and chemical species between the land and the atmosphere. Variations in z 0 are substantial across different types of land cover, ranging from typically less than 1 mm over fresh snow or sand deserts up to more than 1 m over urban areas or forests. In this study, we revise the parameterizations and parameter choices related to z 0 in the Community Land Model 5.1 (CLM), the land component of the Community Earth System Model (CESM). We propose a number modifications for z 0 in CLM, guided by observational data. Most importantly, we find that the observations support an increase in z 0 for all types of forests and a decrease in the momentum z 0 for bare soil, snow, glaciers, and crops. We then assess the effect of those modifications in land-only and land-atmosphere coupled simulations. With the revised parameterizations, diurnal variations of the land surface temperature (LST) are dampened in forested regions and are amplified over warm deserts. These changes mitigate model biases compared to MODerate resolution Imaging Spectroradiometer (MODIS) remote sensing observations. The changes in LST are generally stronger during the day than at night. For example, the LST increases by 5.1 K at 13:30 local solar time but only by 0.6 K at 01:30 during boreal summer across the entire Sahara. The induced changes in the diurnal variability of near-surface air temperatures are generally of the opposite sign and of smaller magnitude. Near-surface winds accelerate in areas where the momentum z 0 was lowered, such as the Sahara, the Middle East, and Antarctica, and decelerate in regions with forests. Overall, this study finds that the current representation of z 0 in CLM is not in agreement with observational constraints for several types of land cover. The proposed model modifications are shown to ... |
author2 |
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université de Cergy Pontoise (UCP) Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Meier, Ronny Davin, Edouard L. Bonan, Gordon B. Lawrence, David M. Hu, Xiaolong Duveiller, Gregory Prigent, Catherine Seneviratne, Sonia I. |
author_facet |
Meier, Ronny Davin, Edouard L. Bonan, Gordon B. Lawrence, David M. Hu, Xiaolong Duveiller, Gregory Prigent, Catherine Seneviratne, Sonia I. |
author_sort |
Meier, Ronny |
title |
Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 |
title_short |
Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 |
title_full |
Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 |
title_fullStr |
Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 |
title_full_unstemmed |
Impacts of a revised surface roughness parameterization in the Community Land Model 5.1 |
title_sort |
impacts of a revised surface roughness parameterization in the community land model 5.1 |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03717122 https://insu.hal.science/insu-03717122/document https://insu.hal.science/insu-03717122/file/gmd-15-2365-2022.pdf https://doi.org/10.5194/gmd-15-2365-2022 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 1991-9603 EISSN: 1991-959X Geoscientific Model Development https://insu.hal.science/insu-03717122 Geoscientific Model Development, 2022, 15, pp.2365-2393. ⟨10.5194/gmd-15-2365-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/gmd-15-2365-2022 insu-03717122 https://insu.hal.science/insu-03717122 https://insu.hal.science/insu-03717122/document https://insu.hal.science/insu-03717122/file/gmd-15-2365-2022.pdf BIBCODE: 2022GMD.15.2365M doi:10.5194/gmd-15-2365-2022 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/gmd-15-2365-2022 |
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Geoscientific Model Development |
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