Dense shelf water formation process in the Sea of Okhotsk based on an ice-ocean coupled model
Dense shelf water formation process in the Sea of Okhotsk based on an ice-ocean coupled model
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基于冰海耦合模型的鄂霍次克海稠密陆架水形成过程
DOI：
10.1029/2009jc006007
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and H. Yamaguchi
中科院分区：
文献类型：
--
作者：
Fujisaki;A.;H. Mitsudera;and H. Yamaguchi
用冰-海耦合模式研究了鄂霍次克海致密陆架水的形成过程。通过1998-2000年的后播，模拟了受沿海地区气温和平均冰速控制的异常冰川产生。在1998-1999年，冰的产量增加了30%，而在1999-2000年，较不发达的冰盖允许从海洋中损失更多的热量。补偿的热损失维持了1998年至1999年26.75GT；26.75σθ的DSW的类似生产。然而，冰的产生使DSW的密度结构变厚，在1998-1999年间，DSW的密度明显增加。不加盐水的实验表明，密度结构的改变对脱卤剂的脱卤率的影响远大于体积产量的增加。拒绝卤水的信号到达了千岛盆地更南边的27σθ层。模式还表明，当忽略冬季从大陆架流出的DSW时，与1998-2000年的实际生产量相比，年生产量被低估了20%。冰产量随着气-冰阻力系数CDai的增大而增加，随着冰水阻力系数CDiw的减小而减小，因为Polynya活动增强。相反，随着CDai的增加，DSW的密度结构变轻，表现为以平流增强为主和产冰略有增加的线性平衡。因此，与逐年异常的空气状况相比，DSW属性似乎对Cd和Cd不敏感。
Formation process of the dense shelf water (DSW) in the Sea of Okhotsk was investigated with an ice‐ocean coupled model. The hindcast through 1998–2000 modeled the anomalous ice productions being controlled by air temperature and mean ice speed over the coastal area. Ice production was larger by 30% in 1998–1999, while less developed ice cover in 1999–2000 allowed larger heat loss from the ocean. The compensating heat loss sustained the similar production of the DSW for >26.75σθin 1998–1999. However, ice production thickened up the density constitution of the DSW, which was significantly denser in 1998–1999. An experiment without brine rejection suggested such modification of the density constitution plays a rather more important role in brine rejection for the DSW property than an increase of the volumetric production. The signal of brine rejection reached the 27σθlayer farther south in the Kuril Basin. The model also showed that when winter outflow of the DSW from the continental shelf was neglected, as is the case in observational estimations, the annual production was underestimated by 20% compared with actual productions in 1998–2000. Ice production was increased as the air‐ice drag coefficientCDaiincreased and as the ice‐water drag coefficientCDiwdecreased because of the intensified polynya activity. In contrast, the density constitution of the DSW was lightened with the increasedCDai, as a linear balance of dominantly intensified advection and slight increase of ice production. Consequently, the DSW property seemed insensitive toCDaiandCDiwcompared with the anomalous air conditions year by year.