Simulation of double cold cores of the 35°N section in the Yellow Sea with a wave-tide-circulation coupled model |
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Authors: | Xia Changshui Qiao Fangli Zhang Mengning Yang Yongzeng Yuan Yeli |
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Institution: | (1) The First Institute of Oceanography, State Oceanic Administration (SOA), 266061 Qingdao, China;(2) Key Laboratory of Marine Science and Numerical Modeling (MASNUM), SOA, 266061 Qingdao, China;(3) The Marine Environment College, Ocean University of China, 266003 Qingdao, China;(4) Guest Researcher of MASNUM, SOA, China |
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Abstract: | Based on the MASNUM wave-tide-circulation coupled numerical model, the temperature structure along 35°N in the Yellow Sea
was simulated and compared with the observations. One of the notable features of the temperature structure along 35°N section
is the double cold cores phenomena during spring and summer. The double cold cores refer to the two cold water centers located
near 122°E and 125°E from the depth of 30m to bottom. The formation, maintenance and disappearance of the double cold cores
are discussed. At least two reasons make the temperature in the center (near 123°E) of the section higher than that near the
west and east shores in winter. One reason is that the water there is deeper than the west and east sides so its heat content
is higher. The other is invasion of the warm water brought by the Yellow Sea Warm Current (YSWC) during winter. This temperature
pattern of the lower layer (from 30m to bottom) is maintained through spring and summer when the upper layer (0 to 30m) is
heated and strong thermocline is formed. Large zonal span of the 35°N section (about 600 km) makes the cold cores have more
opportunity to survive. The double cold cores phenomena disappears in early autumn when the west cold core vanishes first
with the dropping of the thermocline position.
Supported by the National Basic Research Program of China (No. G1999043809) and the National Science Foundation of China (No.
49736190). |
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Keywords: | temperature The Yellow Sea wave-tide-circulation coupled model double cold cores |
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