双扩散在南极文森湾海域热盐结构演变中的作用          下载免费PDF全文

张贤良  程灵巧  高郭平 《极地研究》2018,30(1):32-41

利用22头象海豹携带的CTD观测到的2012年3—4月南极文森湾中西部海域的海水温盐剖面数据,研究了双扩散效应在海水热盐演变过程中的作用。结果显示,该海域双扩散效应显著,其中"扩散对流"作用在水柱中所占比例超过50%,并普遍存在于500—800 dbar深度的深层水中;"盐指对流"作用在水柱中所占比例不超过10%,存在于300—500 dbar的中层水中;随着时间进入南极冬季,海水结冰盐析过程会使水体中重力不稳定状态加剧。"扩散对流"会产生向上的热通量和盐度通量,热通量大约在0.02—0.5 W·m~(–2),盐度通量平均在10–8 m·s~(–1)左右;"盐指对流"则会产生向下的热通量和盐度通量,平均热通量约为–0.5 W·m~(–2),平均盐度通量约为–10–8 m·s~(–1)。在结冰初期,文森湾陆架海域的海表结冰过程对低温高盐水体的产生具有补充作用,进而通过扩散对流作用使得高密度陆架水(DSW)在水体内部得到补充生长与积累。因此,双扩散作用对于该海域高密陆架水的形成有不可忽视的贡献。  相似文献   

STUDY OF WATER—TRANSPORT THROUGH SOME MAIN STRAITS IN THE EAST CHINA SEA AND SOUTH CHINA SEA   总被引：7，自引：0，他引：7  

鲍献文  高郭平  吴德星 《中国海洋湖沼学报》2002,20(4):293-302

OCCAM global ocean model results were applied to calculate the monthly water transport through 7 straits around the East China Sea(ECS)and the South china Sea(SCS).Analysis of the features of velocity profiles and their variations in the Togara Strait,Luzon Strait and Eastern Taiwan Strait showed that;1)the velocity profiles had striped pattern in the Eastern Taiwan Strait,where monthly flux varied from 22.4 to 28.1 Sv and annual mean was about 25.8 Sv;2)the profiles of velocity in the Togara Strait were characterized by core structure,and monthly flux varied from 23.3 to 31.4 Sv,with annual mean of about 27.9 Sv;3)water flowed from the SCS to the ECS in the Taiwan Strait,with maximum flux of 3.1 Sv in July and minimum of 0.9 Sv in November;4)the flux in the Tsushima Strait varied by only about 0.4 Sv by season and its annual mean was about 2.3 Sv;5)Kuroshio water flowed into the SCS in the Luzon Strait throughout the year and the velocity profiles were characterized by multi-core structure.The flux in the Luzon Strait was minimun in June(about 2.4 Sv)and maximum in February(about 9.0 Sv),and its annual mean was 4.8 Sv;6)the monthly flux in the Mindoro Strait was maximum in December(3.0 Sv)and minimum in June(Only 0.1 Sv),and its annual mean was 1.3 Sv;7)Karimata Strait water flowed into the SCS from May to August,with maximum in-flow flux of about 0.75 Sv in June and flowed out from September to April at maximum outflow flux of 3.9 Sv in January.The annual mean flux was about 1.35 Sv.  相似文献   

1999年夏季中国首次北极考察区水团特征   总被引：11，自引：3，他引：11       下载免费PDF全文

高郭平  董兆乾  侍茂崇 《极地研究》2003,15(1):11-20

依据 1 999年 7月至 9月中国首次北极考察队在白令海、楚科奇海和南加拿大海盆的现场调查资料 ,本文分析了三个海区的水团特征 :( 1 )白令海水团主要由季节变化显著的白令海上层水团和中层水团以及深层水团组成 ;( 2 )楚科奇海水文特征受融结冰过程影响较大 ,1 999年7月和 8月差异较大 ,其水团主要为浅海变性水团 ,包括两个次级水团 ,楚科奇海夏季水和来自北太平洋以及北冰洋变性的外海入侵水 ;( 3)南加拿大海盆的水团主要由受融结冰过程影响的表层水团、源于太平洋水的次表层水、源自北大西洋的中层水团和深层水团组成  相似文献