Offshore Detachment Process of the Low-Salinity Water around Changjiang Bank in the East China SeaSource: Journal of Physical Oceanography:;2010:;Volume( 040 ):;issue: 005::page 1035DOI: 10.1175/2010JPO4167.1Publisher: American Meteorological Society
Abstract: A patchlike structure of low-salinity water detached from the Chanjiang ?Diluted Water? (CDW) is frequently observed in the East China Sea (ECS). In this study, the offshore detachment process of CDW into the ECS is examined using a three-dimensional numerical model. The model results show that low-salinity water is detached from the CDW plume by the intense tide-induced vertical mixing during the spring tide period when the tidal current becomes stronger. During the spring tide, thickness of the bottom mixed layer in the sloping bottom around Changjiang Bank reaches the mean water depth, implying that the stratification is completely destroyed in the entire water column. As a result, the offshore detachment of CDW occurs in the sloping side of the bank where the tidal energy dissipation is strong enough to overcome the buoyancy effect during this period. On the other hand, the surface stratification is retrieved during the neap tide period, because the tidal current becomes substantially weaker than that in the spring tide. Wind forcing over the ECS as well as tidal mixing is a critical factor for the detachment process because the surface wind primarily induces a northeastward CDW transport across the shelf region where tide-induced vertical mixing is strong. Moreover, the wind-enhanced cross-isobath transport of CDW causes a larger offshore low-salinity patch, indicating that the freshwater volume of the low-salinity patch closely depends on the wind magnitude.
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contributor author | Moon, Jae-Hong | |
contributor author | Hirose, Naoki | |
contributor author | Yoon, Jong-Hwan | |
contributor author | Pang, Ig-Chan | |
date accessioned | 2017-06-09T16:36:36Z | |
date available | 2017-06-09T16:36:36Z | |
date copyright | 2010/05/01 | |
date issued | 2010 | |
identifier issn | 0022-3670 | |
identifier other | ams-70881.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4212710 | |
description abstract | A patchlike structure of low-salinity water detached from the Chanjiang ?Diluted Water? (CDW) is frequently observed in the East China Sea (ECS). In this study, the offshore detachment process of CDW into the ECS is examined using a three-dimensional numerical model. The model results show that low-salinity water is detached from the CDW plume by the intense tide-induced vertical mixing during the spring tide period when the tidal current becomes stronger. During the spring tide, thickness of the bottom mixed layer in the sloping bottom around Changjiang Bank reaches the mean water depth, implying that the stratification is completely destroyed in the entire water column. As a result, the offshore detachment of CDW occurs in the sloping side of the bank where the tidal energy dissipation is strong enough to overcome the buoyancy effect during this period. On the other hand, the surface stratification is retrieved during the neap tide period, because the tidal current becomes substantially weaker than that in the spring tide. Wind forcing over the ECS as well as tidal mixing is a critical factor for the detachment process because the surface wind primarily induces a northeastward CDW transport across the shelf region where tide-induced vertical mixing is strong. Moreover, the wind-enhanced cross-isobath transport of CDW causes a larger offshore low-salinity patch, indicating that the freshwater volume of the low-salinity patch closely depends on the wind magnitude. | |
publisher | American Meteorological Society | |
title | Offshore Detachment Process of the Low-Salinity Water around Changjiang Bank in the East China Sea | |
type | Journal Paper | |
journal volume | 40 | |
journal issue | 5 | |
journal title | Journal of Physical Oceanography | |
identifier doi | 10.1175/2010JPO4167.1 | |
journal fristpage | 1035 | |
journal lastpage | 1053 | |
tree | Journal of Physical Oceanography:;2010:;Volume( 040 ):;issue: 005 | |
contenttype | Fulltext |