Interannual variation of a bottom cold water mass in the Seto Inland Sea, Japan
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Published:2022-05-10
Issue:3
Volume:18
Page:659-673
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ISSN:1812-0792
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Container-title:Ocean Science
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language:en
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Short-container-title:Ocean Sci.
Author:
Zhu Junying, Shi Jie, Guo XinyuORCID
Abstract
Abstract. A bottom cold water mass (BCWM) is a widespread physical
oceanographic phenomenon in coastal seas, and its temperature variability
has an important effect on the marine ecological environment. In this study,
the interannual variation of the BCWM in Iyo-Nada (INCWM), a semi-enclosed
bay in the Seto Inland Sea, Japan, from 1994 to 2015 and its response to
air–sea heat flux change were investigated using monthly observational data
and a hydrodynamic model. Surrounded by the isotherm of 18 ∘C, the
observed multi-year average water temperature inside the INCWM was 17.58 ∘C with a standard deviation of 0.27 ∘C, while the mean area
of INCWM was 5.73 × 105 m2 with a standard deviation of
4.35 × 105 m2. The interannual variation of average water
temperature of INCWM showed a negative correlation with its area that
indicates a low temperature corresponds to a big area. In addition, the
interannual variation of the average temperature inside INCWM showed
positive correlations with the local water temperature from April to July
and with remote water temperature below 10 m in an adjacent strait in July.
Differing from previously studied BCWMs, which had interannual variations
depending closely on the water temperature before the warming season, the
interannual variation of INCWM is more sensitive to the air–sea heat flux
during the warming season than that in the previous winter. Further, by
comparing several BCWMs, we found that the BCWM size is a key factor in
understanding the heat transfer process responsible for the interannual
variation of BCWMs in coastal seas. These findings will help us to
understand the response of bottom cold water mass in coastal seas to sea
surface forcing change.
Funder
Key Research and Development Project of Hainan Province Environmental Restoration and Conservation Agency
Publisher
Copernicus GmbH
Subject
Cell Biology,Developmental Biology,Embryology,Anatomy
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