Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?
Datasets for the Journal of Geophysical Research: Oceans publication: "Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?" [Abstract] Uncertainty exists in the time-mean total transport of the Antar...
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ftzenodo:oai:zenodo.org:3887144 2023-05-15T13:46:31+02:00 Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? XIAOBIAO XU Eric P. Chassignet Yvonne L. Firing Kathleen Donohue 2020-06-09 https://zenodo.org/record/3887144 https://doi.org/10.5281/zenodo.3887144 unknown doi:10.5281/zenodo.3887143 https://zenodo.org/record/3887144 https://doi.org/10.5281/zenodo.3887144 oai:zenodo.org:3887144 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/other dataset 2020 ftzenodo https://doi.org/10.5281/zenodo.388714410.5281/zenodo.3887143 2023-03-10T23:29:20Z Datasets for the Journal of Geophysical Research: Oceans publication: "Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?" [Abstract] Uncertainty exists in the time-mean total transport of the Antarctic Circumpolar Current (ACC), the world’s strongest ocean current. The two most recent observational programs in Drake Passage, DRAKE and cDrake, yielded transports of 141 and 173.3 Sv, respectively. In this paper, we use a realistic 1/12° global ocean simulation to interpret these observational estimates and reconcile their differences. We first show that the modeled ACC transport in the upper 1000 m is in excellent agreement with repeat shipboard acoustic Doppler current profiler (SADCP) transects and that the exponentially decaying transport profile in the model is consistent with the profile derived from repeat hydrographic data. By further comparing the model results to the cDrake and DRAKE observations, we argue that the modeled 157.3 Sv transport, i.e. approximately the average of the cDrake and DRAKE estimates, is actually representative of the time-mean ACC transport through the Drake Passage. The cDrake experiment overestimates the barotropic contribution in part because the array undersampled the deep recirculation southwest of the Shackleton Fracture Zone, whereas the surface geostrophic currents used in the DRAKE estimate yielded a weaker near-surface transport than implied by the SADCP data. We also find that the modeled baroclinic and barotropic transports are not correlated, thus monitoring either baroclinic or barotropic transport alone may be insufficient to assess the temporal variability of the total ACC transport. Dataset Antarc* Antarctic Drake Passage Zenodo Antarctic The Antarctic Drake Passage Shackleton Shackleton Fracture Zone ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
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Datasets for the Journal of Geophysical Research: Oceans publication: "Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?" [Abstract] Uncertainty exists in the time-mean total transport of the Antarctic Circumpolar Current (ACC), the world’s strongest ocean current. The two most recent observational programs in Drake Passage, DRAKE and cDrake, yielded transports of 141 and 173.3 Sv, respectively. In this paper, we use a realistic 1/12° global ocean simulation to interpret these observational estimates and reconcile their differences. We first show that the modeled ACC transport in the upper 1000 m is in excellent agreement with repeat shipboard acoustic Doppler current profiler (SADCP) transects and that the exponentially decaying transport profile in the model is consistent with the profile derived from repeat hydrographic data. By further comparing the model results to the cDrake and DRAKE observations, we argue that the modeled 157.3 Sv transport, i.e. approximately the average of the cDrake and DRAKE estimates, is actually representative of the time-mean ACC transport through the Drake Passage. The cDrake experiment overestimates the barotropic contribution in part because the array undersampled the deep recirculation southwest of the Shackleton Fracture Zone, whereas the surface geostrophic currents used in the DRAKE estimate yielded a weaker near-surface transport than implied by the SADCP data. We also find that the modeled baroclinic and barotropic transports are not correlated, thus monitoring either baroclinic or barotropic transport alone may be insufficient to assess the temporal variability of the total ACC transport. |
format |
Dataset |
author |
XIAOBIAO XU Eric P. Chassignet Yvonne L. Firing Kathleen Donohue |
spellingShingle |
XIAOBIAO XU Eric P. Chassignet Yvonne L. Firing Kathleen Donohue Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? |
author_facet |
XIAOBIAO XU Eric P. Chassignet Yvonne L. Firing Kathleen Donohue |
author_sort |
XIAOBIAO XU |
title |
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? |
title_short |
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? |
title_full |
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? |
title_fullStr |
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? |
title_full_unstemmed |
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations? |
title_sort |
antarctic circumpolar current transport through drake passage: what can we learn from comparing high-resolution model results to observations? |
publishDate |
2020 |
url |
https://zenodo.org/record/3887144 https://doi.org/10.5281/zenodo.3887144 |
long_lat |
ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
geographic |
Antarctic The Antarctic Drake Passage Shackleton Shackleton Fracture Zone |
geographic_facet |
Antarctic The Antarctic Drake Passage Shackleton Shackleton Fracture Zone |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_relation |
doi:10.5281/zenodo.3887143 https://zenodo.org/record/3887144 https://doi.org/10.5281/zenodo.3887144 oai:zenodo.org:3887144 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.388714410.5281/zenodo.3887143 |
_version_ |
1766243713713963008 |