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Sea-level variation/change and thermal contribution in the Bering Sea

查看全文 作　　者：ZUO Juncheng ZHANG Jianli DU Ling LI Peiliang LI [1]Lei 高影响力作者 机构地区：[1]College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003, China College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003, China College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003, China College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003, China College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003, China高影响力机构 出　　处：《Acta Oceanologica Sinica》索引2005年第24卷第6期,共10页高影响力期刊 基　　金：supported by the project of the National Natural Science Foundation of China under cotract Nos 49600,40376005,40576011 and 40506006 and NCEr and NCET-04.4-0646. 摘　　要：The long-term sea-level trend in the Bering Sea is obtained by the analysis of TOPEX/Poseidon altimeter data, including the data of two tide gauges. The averaged sea-level in the Bering Sea rises at a rate of 2.47 mm/a from 1992 to 2002. The mean sea-level is falling in the most part of the Bering Sea, especially in its central basin, and it is rising in the northeastern part of the Bering Sea. During the 1998/99 change, the sea-level anomaly differences exhibit a significant sea-level anomaly fall in the deep basin of the Bering Sea, which is roughly in the same position where a prominent SST fall exists. The maximal fall of sea-level is about 10 cm in the southwestern part of the Bering Sea, and the maximal fall of about 2℃ in the SST also appeared in the same region as the sea level did. The steric sea-level change due to temperature variations is discussed. The results are compared with the TOPEX/Poseidon altimeter data at the different spatial scales. It is indicated that the seasonal amplitude of the steric height is about 35% of the observed TOPEX/Poseidon amplitude, which is much smaller than the 83% in the mid-latitudes area. The systematic difference between the TOPEX/Poseidon data with the range of about 7.5 cm and the thermal contribution with the range of about 2.5 cm is about 5 cm. This indicates that the thermal effect on the sea level is not as important as the case in the mid-latitudes area. In the Bering Sea, the phase of the steric height leads the observed sea level by about three months. 关 键 词：SEA-LEVEL VARIATION STERIC BERING Sea
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