Middle to late Holocene changes of the Okhotsk Sea Intermediate Water and their relation to atmospheric circulation
Middle to late Holocene changes of the Okhotsk Sea Intermediate Water and their relation to atmospheric circulation
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DOI：
10.1029/2004gl021384
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发表时间：
2004-12-28
影响因子：
5.2
通讯作者：
Ikehara, K
中科院分区：
文献类型：
--
作者：
Itaki, T;Ikehara, K
[1] 在鄂霍次克海中层水（OSIW）中观察到了鄂霍次克海放射虫 Cycladophora davisiana 的高丰度。这种水是由冰间湖中的盐水排出而形成的，其特点是寒冷、含氧条件，微生物含量高。海洋西南部三个沉积物岩心中记录的 C. davisiana 丰度暗示了过去 7.5 kyrs 期间 OSIW 的通风变化。在对应暖期的7.5～3.5ka期间，通气量显着增加，但在新冰河期和小冰期等冷期的3～2ka和0.3～0.4ka期间，通气量分别下降。通风量下降可能是由于冬季阿留申低气压向南移动导致风向从北风转向东风，冰间湖减少所致。
[ 1] High abundance of the radiolarian Cycladophora davisiana in the Sea of Okhotsk has been observed at the Okhotsk Sea Intermediate Water ( OSIW). This water is formed by brine rejection in the polynya and is characterized by cold, oxygenated conditions, with high a microbial content. The C. davisiana abundance recorded in three sediment cores from the southwestern part of the sea implies ventilation changes of the OSIW during the last 7.5 kyrs. The ventilation had significantly increased during the interval from 7.5 to 3.5 ka corresponding to a warm period, but declined during 3 to 2 ka and at 0.3-0.4 ka coincident with cold periods such as the Neoglaciation and Little Ice Age, respectively. The declined ventilation might be caused by reduction of the polynyas with the wind vector change from a northerly to an easterly direction relating to the southward shift of the Aleutian Low during the strong winter.