A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings
The sea level over the tropical Pacific is a key indicator reflecting vertically integrated heat distribution over the ocean. Here, we use the Geophysical Fluid Dynamics Laboratory global ocean–sea ice model (GFDL-OM4) forced by both the Coordinated Ocean-Ice Reference Experiment (CORE) and Japanese...
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2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00056489 2024-09-15T18:35:22+00:00 A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings Hsu, Chia-Wei Yin, Jianjun Griffies, Stephen M. Dussin, Raphael 2021-05 electronic https://doi.org/10.5194/gmd-14-2471-2021 https://noa.gwlb.de/receive/cop_mods_00056489 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056140/gmd-14-2471-2021.pdf https://gmd.copernicus.org/articles/14/2471/2021/gmd-14-2471-2021.pdf eng eng Copernicus Publications Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-14-2471-2021 https://noa.gwlb.de/receive/cop_mods_00056489 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056140/gmd-14-2471-2021.pdf https://gmd.copernicus.org/articles/14/2471/2021/gmd-14-2471-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/gmd-14-2471-2021 2024-06-26T04:40:00Z The sea level over the tropical Pacific is a key indicator reflecting vertically integrated heat distribution over the ocean. Here, we use the Geophysical Fluid Dynamics Laboratory global ocean–sea ice model (GFDL-OM4) forced by both the Coordinated Ocean-Ice Reference Experiment (CORE) and Japanese 55-year Reanalysis (JRA-55)-based surface dataset for driving ocean–sea ice models (JRA55-do) atmospheric states (Ocean Model Intercomparison Project (OMIP) versions I and II) to evaluate the model performance and biases compared against available observations. We find persisting mean state dynamic sea level (DSL) bias along 9∘ N even with updated wind forcing in JRA55-do relative to CORE. The mean state bias is related to biases in wind stress forcing and geostrophic currents in the 4 to 9∘ N latitudinal band. The simulation forced by JRA55-do significantly reduces the bias in DSL trend over the northern tropical Pacific relative to CORE. In the CORE forcing, the anomalous westerly wind trend in the eastern tropical Pacific causes an underestimated DSL trend across the entire Pacific basin along 10∘ N. The simulation forced by JRA55-do significantly reduces the bias in DSL trend over the northern tropical Pacific relative to CORE. We also identify a bias in the easterly wind trend along 20∘ N in both JRA55-do and CORE, thus motivating future improvement. In JRA55-do, an accurate Rossby wave initiated in the eastern tropical Pacific at seasonal timescale corrects a biased seasonal variability of the northern equatorial countercurrent in the CORE simulation. Both CORE and JRA55-do generate realistic DSL variation during El Niño. We find an asymmetry in the DSL pattern on two sides of the Equator is strongly related to wind stress curl that follows the sea level pressure evolution during El Niño. Article in Journal/Newspaper Sea ice Niedersächsisches Online-Archiv NOA Geoscientific Model Development 14 5 2471 2502 |
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article Verlagsveröffentlichung Hsu, Chia-Wei Yin, Jianjun Griffies, Stephen M. Dussin, Raphael A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings |
topic_facet |
article Verlagsveröffentlichung |
description |
The sea level over the tropical Pacific is a key indicator reflecting vertically integrated heat distribution over the ocean. Here, we use the Geophysical Fluid Dynamics Laboratory global ocean–sea ice model (GFDL-OM4) forced by both the Coordinated Ocean-Ice Reference Experiment (CORE) and Japanese 55-year Reanalysis (JRA-55)-based surface dataset for driving ocean–sea ice models (JRA55-do) atmospheric states (Ocean Model Intercomparison Project (OMIP) versions I and II) to evaluate the model performance and biases compared against available observations. We find persisting mean state dynamic sea level (DSL) bias along 9∘ N even with updated wind forcing in JRA55-do relative to CORE. The mean state bias is related to biases in wind stress forcing and geostrophic currents in the 4 to 9∘ N latitudinal band. The simulation forced by JRA55-do significantly reduces the bias in DSL trend over the northern tropical Pacific relative to CORE. In the CORE forcing, the anomalous westerly wind trend in the eastern tropical Pacific causes an underestimated DSL trend across the entire Pacific basin along 10∘ N. The simulation forced by JRA55-do significantly reduces the bias in DSL trend over the northern tropical Pacific relative to CORE. We also identify a bias in the easterly wind trend along 20∘ N in both JRA55-do and CORE, thus motivating future improvement. In JRA55-do, an accurate Rossby wave initiated in the eastern tropical Pacific at seasonal timescale corrects a biased seasonal variability of the northern equatorial countercurrent in the CORE simulation. Both CORE and JRA55-do generate realistic DSL variation during El Niño. We find an asymmetry in the DSL pattern on two sides of the Equator is strongly related to wind stress curl that follows the sea level pressure evolution during El Niño. |
format |
Article in Journal/Newspaper |
author |
Hsu, Chia-Wei Yin, Jianjun Griffies, Stephen M. Dussin, Raphael |
author_facet |
Hsu, Chia-Wei Yin, Jianjun Griffies, Stephen M. Dussin, Raphael |
author_sort |
Hsu, Chia-Wei |
title |
A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings |
title_short |
A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings |
title_full |
A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings |
title_fullStr |
A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings |
title_full_unstemmed |
A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings |
title_sort |
mechanistic analysis of tropical pacific dynamic sea level in gfdl-om4 under omip-i and omip-ii forcings |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/gmd-14-2471-2021 https://noa.gwlb.de/receive/cop_mods_00056489 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056140/gmd-14-2471-2021.pdf https://gmd.copernicus.org/articles/14/2471/2021/gmd-14-2471-2021.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-14-2471-2021 https://noa.gwlb.de/receive/cop_mods_00056489 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056140/gmd-14-2471-2021.pdf https://gmd.copernicus.org/articles/14/2471/2021/gmd-14-2471-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/gmd-14-2471-2021 |
container_title |
Geoscientific Model Development |
container_volume |
14 |
container_issue |
5 |
container_start_page |
2471 |
op_container_end_page |
2502 |
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1810478532126572544 |