A preliminary study on variations of the Changjiang Diluted Water between August 1999 and 2006

ZHOU Feng; XUAN Ji-liang; NI Xiao-bo; HUANG Da-ji

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ZHOU Feng, XUAN Ji-liang, NI Xiao-bo, HUANG Da-ji. A preliminary study on variations of the Changjiang Diluted Water between August 1999 and 2006[J]. Haiyang Xuebao, 2009, 31(4): 1-12.

Citation:

ZHOU Feng, XUAN Ji-liang, NI Xiao-bo, HUANG Da-ji. A preliminary study on variations of the Changjiang Diluted Water between August 1999 and 2006[J]. Haiyang Xuebao, 2009, 31(4): 1-12.

ZHOU Feng, XUAN Ji-liang, NI Xiao-bo, HUANG Da-ji. A preliminary study on variations of the Changjiang Diluted Water between August 1999 and 2006[J]. Haiyang Xuebao, 2009, 31(4): 1-12.

Citation:

ZHOU Feng, XUAN Ji-liang, NI Xiao-bo, HUANG Da-ji. A preliminary study on variations of the Changjiang Diluted Water between August 1999 and 2006[J]. Haiyang Xuebao, 2009, 31(4): 1-12.

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A preliminary study on variations of the Changjiang Diluted Water between August 1999 and 2006

1.
Department of Fluid Mechanics, School of Aeronautics and Astronautics of Zhejiang University, Hangzhou 310027, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2008-08-05
Rev Recd Date: 2009-04-22

Abstract

Abstract

A large area hypoxia has been already reported respectively by two interdisciplinary surveys off the Chang jiang Estuary since summer of 1999 and 2006.The hypoxic zone shows distinct year-to-year variations.Observed oceanographic data are first analysized and reveals a big difference for the Chang jiang Diluted Water (CDW) between these two periods,either.These great changes are related to the tremendous reduction of the freshwater discharge and variations of wind fields between these two years.It is also found that the monthly mean intrusion of Kuroshio and its branches has increased in the north of East China Sea(ECS),but decreased in the south of ECS in August 2006 comparing with 1999 on the base of general circulation models.Then,the Regional Ocean Modelling Systems is applied to the ECS to evaluate the contributions and relative importance of impacts from the river discharge,wind forcing and open boundary data.Our simulations reproduce the phenomena that more fresh water extends northeastward in 2006 and forms a negative SSS anomaly to the northeast of the river mouth comparing with 1999,which is consistent with observations.The five group numerical tests suggest that the wind forcing dominates the CDW variations followed by the Kuroshio and its branches.
- Changjiang,
- Changjiang Diluted Water,
- summer,
- variations,
- dynamics,
- hypoxic zone

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References(44)

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