On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica
Analyses of hydrographic observation data sets revealed that modified Circumpolar Deep Water (mCDW) tends to flood the western flank (73-78 degrees E, 67-68 degrees S) of the Four Ladies Bank (FLB) in Prydz Bay. In this study, we investigated the mechanism responsible for mCDW upwelling over the FLB...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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AMER GEOPHYSICAL UNION
2018
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Online Access: | http://ir.qdio.ac.cn/handle/337002/155816 https://doi.org/10.1029/2018JC014026 |
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/155816 2023-05-15T13:22:12+02:00 On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica Liu, Chengyan Wang, Zhaomin Cheng, Chen Wu, Yang Xia, Ruibin Li, Bingrui Li, Xiang 2018-11-01 http://ir.qdio.ac.cn/handle/337002/155816 https://doi.org/10.1029/2018JC014026 英语 eng AMER GEOPHYSICAL UNION JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS http://ir.qdio.ac.cn/handle/337002/155816 doi:10.1029/2018JC014026 modified Circumpolar Deep Water Antarctic Slope Current potential vorticity Prdyz Bay onshore upwelling topography dynamic effect Oceanography AMERY ICE SHELF BOTTOM WATER SEA-ICE SOUTHERN-OCEAN CAPE DARNLEY TRANSPORT CIRCULATION REGION EDDY MELT 期刊论文 2018 ftchinacasciocas https://doi.org/10.1029/2018JC014026 2022-06-27T05:38:49Z Analyses of hydrographic observation data sets revealed that modified Circumpolar Deep Water (mCDW) tends to flood the western flank (73-78 degrees E, 67-68 degrees S) of the Four Ladies Bank (FLB) in Prydz Bay. In this study, we investigated the mechanism responsible for mCDW upwelling over the FLB based on an eddy-resolving coupled ocean-sea ice-ice shelf model in conjunction with the latest high-accuracy bathymetry. It was found that zonal step-like declines in the seabed over the FLB are crucial for the mCDW onshore upwelling, through topographic dynamic effects on the alongshore Antarctic Slope Current. In the presence of meridional cross-shelf sigma isopycnals, warm mCDW at 500-m depth in the deep sea can make its approach to the shallower continental shelf (200- to 500-m depths), characterized as a warm layer (> -1.8 degrees C) bounded by the cross-shelf sigma isopycnal surfaces of 27.5 and 27.7kg/m(3). The simulated outflow of the Prydz Bay gyre is concentrated to the eastern flank of the Prydz Channel. These results suggest that, in addition to the depressions and troughs around the Antarctic, smaller topographic features such as step-like declines in the seabed near the Antarctic Slope Current are also favorable for onshore mCDW intrusion. This study demonstrates that mCDW onshore transport around the Antarctic continental shelf might be significantly underestimated by numerical models with coarse spatial representations of the topography. Plain Language Summary Based the observational data sets, warm Circumpolar Deep Water was identified over the Four Ladies Bank in Prydz Bay, East Antarctica. The warm signals could be delivered into the ocean cavity beneath the downstream ice shelf and result in remarkable influences to the ice shelf basal melting. In order to investigate the intrusion of warm Circumpolar Deep Water, we used a numerical model to simulate the oceanic circulations in Prydz Bay. By assessing the simulated results, we found that the topographic influences of the changes in seabed on ... Report Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Prydz Bay Sea ice Southern Ocean Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic Cape Darnley ENVELOPE(69.567,69.567,-67.738,-67.738) Darnley ENVELOPE(69.717,69.717,-67.717,-67.717) East Antarctica Four Ladies Bank ENVELOPE(77.500,77.500,-67.500,-67.500) Prydz Bay Prydz Channel ENVELOPE(73.000,73.000,-67.000,-67.000) Southern Ocean The Antarctic Journal of Geophysical Research: Oceans 123 11 7819 7838 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
modified Circumpolar Deep Water Antarctic Slope Current potential vorticity Prdyz Bay onshore upwelling topography dynamic effect Oceanography AMERY ICE SHELF BOTTOM WATER SEA-ICE SOUTHERN-OCEAN CAPE DARNLEY TRANSPORT CIRCULATION REGION EDDY MELT |
spellingShingle |
modified Circumpolar Deep Water Antarctic Slope Current potential vorticity Prdyz Bay onshore upwelling topography dynamic effect Oceanography AMERY ICE SHELF BOTTOM WATER SEA-ICE SOUTHERN-OCEAN CAPE DARNLEY TRANSPORT CIRCULATION REGION EDDY MELT Liu, Chengyan Wang, Zhaomin Cheng, Chen Wu, Yang Xia, Ruibin Li, Bingrui Li, Xiang On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica |
topic_facet |
modified Circumpolar Deep Water Antarctic Slope Current potential vorticity Prdyz Bay onshore upwelling topography dynamic effect Oceanography AMERY ICE SHELF BOTTOM WATER SEA-ICE SOUTHERN-OCEAN CAPE DARNLEY TRANSPORT CIRCULATION REGION EDDY MELT |
description |
Analyses of hydrographic observation data sets revealed that modified Circumpolar Deep Water (mCDW) tends to flood the western flank (73-78 degrees E, 67-68 degrees S) of the Four Ladies Bank (FLB) in Prydz Bay. In this study, we investigated the mechanism responsible for mCDW upwelling over the FLB based on an eddy-resolving coupled ocean-sea ice-ice shelf model in conjunction with the latest high-accuracy bathymetry. It was found that zonal step-like declines in the seabed over the FLB are crucial for the mCDW onshore upwelling, through topographic dynamic effects on the alongshore Antarctic Slope Current. In the presence of meridional cross-shelf sigma isopycnals, warm mCDW at 500-m depth in the deep sea can make its approach to the shallower continental shelf (200- to 500-m depths), characterized as a warm layer (> -1.8 degrees C) bounded by the cross-shelf sigma isopycnal surfaces of 27.5 and 27.7kg/m(3). The simulated outflow of the Prydz Bay gyre is concentrated to the eastern flank of the Prydz Channel. These results suggest that, in addition to the depressions and troughs around the Antarctic, smaller topographic features such as step-like declines in the seabed near the Antarctic Slope Current are also favorable for onshore mCDW intrusion. This study demonstrates that mCDW onshore transport around the Antarctic continental shelf might be significantly underestimated by numerical models with coarse spatial representations of the topography. Plain Language Summary Based the observational data sets, warm Circumpolar Deep Water was identified over the Four Ladies Bank in Prydz Bay, East Antarctica. The warm signals could be delivered into the ocean cavity beneath the downstream ice shelf and result in remarkable influences to the ice shelf basal melting. In order to investigate the intrusion of warm Circumpolar Deep Water, we used a numerical model to simulate the oceanic circulations in Prydz Bay. By assessing the simulated results, we found that the topographic influences of the changes in seabed on ... |
format |
Report |
author |
Liu, Chengyan Wang, Zhaomin Cheng, Chen Wu, Yang Xia, Ruibin Li, Bingrui Li, Xiang |
author_facet |
Liu, Chengyan Wang, Zhaomin Cheng, Chen Wu, Yang Xia, Ruibin Li, Bingrui Li, Xiang |
author_sort |
Liu, Chengyan |
title |
On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica |
title_short |
On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica |
title_full |
On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica |
title_fullStr |
On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica |
title_full_unstemmed |
On the Modified Circumpolar Deep Water Upwelling Over the Four Ladies Bank in Prydz Bay, East Antarctica |
title_sort |
on the modified circumpolar deep water upwelling over the four ladies bank in prydz bay, east antarctica |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2018 |
url |
http://ir.qdio.ac.cn/handle/337002/155816 https://doi.org/10.1029/2018JC014026 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(69.567,69.567,-67.738,-67.738) ENVELOPE(69.717,69.717,-67.717,-67.717) ENVELOPE(77.500,77.500,-67.500,-67.500) ENVELOPE(73.000,73.000,-67.000,-67.000) |
geographic |
Amery Amery Ice Shelf Antarctic Cape Darnley Darnley East Antarctica Four Ladies Bank Prydz Bay Prydz Channel Southern Ocean The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic Cape Darnley Darnley East Antarctica Four Ladies Bank Prydz Bay Prydz Channel Southern Ocean The Antarctic |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Prydz Bay Sea ice Southern Ocean |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Prydz Bay Sea ice Southern Ocean |
op_relation |
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS http://ir.qdio.ac.cn/handle/337002/155816 doi:10.1029/2018JC014026 |
op_doi |
https://doi.org/10.1029/2018JC014026 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
11 |
container_start_page |
7819 |
op_container_end_page |
7838 |
_version_ |
1766363721828925440 |