Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations
The Southern Ocean plays a fundamental role in the global carbon cycle. Physical and biogeochemical processes, including primary production and the upwelling of carbon-rich water masses, govern carbon exchange between the atmosphere and ocean carbon reservoirs. To study this region, we configured a...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5016032 2023-06-11T04:06:54+02:00 Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations Nakayama, Y. Carroll, D. Wongpan, P. Takao, S. Makabe, R. Zhang, H. Menemenlis, D. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016032 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0433 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016032 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-0433 2023-04-23T23:38:34Z The Southern Ocean plays a fundamental role in the global carbon cycle. Physical and biogeochemical processes, including primary production and the upwelling of carbon-rich water masses, govern carbon exchange between the atmosphere and ocean carbon reservoirs. To study this region, we configured a regional East-Antarctic simulation derived from ECCO-Darwin, a global-ocean biogeochemistry model that assimilates both physical and biogeochemical observations. Our regional ocean model extends from the Antarctic Continent to 60°S and from 100°E to 150°E with horizontal grid spacing of 3–4 km. The model domain includes the Shackleton, Conger, Totten, Moscow University, Holmes, Dibble, and Mertz ice shelves. Since the biogeochemical component of ECCO-Darwin is optimized to best fit global observations, model-data agreement for the East Antarctic region requires further adjustments. For example, (1) simulated upper-100 m nutrient fields are biased high and typical Circumpolar-Deep-Water characteristics with nutrient-rich waters are not clearly simulated and (2) plankton types in the ECCO-Darwin do not include Phaeocystis, an abundant type that plays a key role in the Southern Ocean climate system. In this study, we adjust a small number of physical and biogeochemical model parameters and lateral boundary conditions to achieve improved model-data agreement. We define the cost function as a sum of weighted model-data differences based on both novel in-situ observations and further optimize our simulation using a Green's Functions approach. This work demonstrates downscaling methods for developing regional cutouts from the global-ocean ECCO-Darwin model, which allows for high-resolution coastal studies that include optimized sea ice, ocean physics, and biogeochemistry. Conference Object Antarc* Antarctic Antarctic Ocean Ice Shelves Sea ice Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Antarctic Ocean Shackleton Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The Southern Ocean plays a fundamental role in the global carbon cycle. Physical and biogeochemical processes, including primary production and the upwelling of carbon-rich water masses, govern carbon exchange between the atmosphere and ocean carbon reservoirs. To study this region, we configured a regional East-Antarctic simulation derived from ECCO-Darwin, a global-ocean biogeochemistry model that assimilates both physical and biogeochemical observations. Our regional ocean model extends from the Antarctic Continent to 60°S and from 100°E to 150°E with horizontal grid spacing of 3–4 km. The model domain includes the Shackleton, Conger, Totten, Moscow University, Holmes, Dibble, and Mertz ice shelves. Since the biogeochemical component of ECCO-Darwin is optimized to best fit global observations, model-data agreement for the East Antarctic region requires further adjustments. For example, (1) simulated upper-100 m nutrient fields are biased high and typical Circumpolar-Deep-Water characteristics with nutrient-rich waters are not clearly simulated and (2) plankton types in the ECCO-Darwin do not include Phaeocystis, an abundant type that plays a key role in the Southern Ocean climate system. In this study, we adjust a small number of physical and biogeochemical model parameters and lateral boundary conditions to achieve improved model-data agreement. We define the cost function as a sum of weighted model-data differences based on both novel in-situ observations and further optimize our simulation using a Green's Functions approach. This work demonstrates downscaling methods for developing regional cutouts from the global-ocean ECCO-Darwin model, which allows for high-resolution coastal studies that include optimized sea ice, ocean physics, and biogeochemistry. |
format |
Conference Object |
author |
Nakayama, Y. Carroll, D. Wongpan, P. Takao, S. Makabe, R. Zhang, H. Menemenlis, D. |
spellingShingle |
Nakayama, Y. Carroll, D. Wongpan, P. Takao, S. Makabe, R. Zhang, H. Menemenlis, D. Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
author_facet |
Nakayama, Y. Carroll, D. Wongpan, P. Takao, S. Makabe, R. Zhang, H. Menemenlis, D. |
author_sort |
Nakayama, Y. |
title |
Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
title_short |
Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
title_full |
Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
title_fullStr |
Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
title_full_unstemmed |
Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
title_sort |
optimization and evaluation of a high-resolution, regional, east-antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016032 |
geographic |
Antarctic Antarctic Ocean Shackleton Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Ocean Shackleton Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Ocean Ice Shelves Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean Ice Shelves Sea ice Southern Ocean |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0433 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016032 |
op_doi |
https://doi.org/10.57757/IUGG23-0433 |
_version_ |
1768379139502374912 |