Investigation of the summer Kara Sea circulation employing a variational data assimilation technique
Investigation of the summer Kara Sea circulation employing a variational data assimilation technique
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采用变分数据同化技术研究夏季喀拉海环流
DOI：
10.1029/2006jc003728
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发表时间：
2007
影响因子：
--
通讯作者：
W. Maslowski
中科院分区：
文献类型：
--
作者：
G. Panteleev;A. Proshutinsky;M. Kulakov;D. Nechaev;W. Maslowski
[1]夏季环流和水文领域的喀拉海重建的平均，积极和消极的北极涛动制度采用变分资料同化技术，提供了最佳的适合重建领域的气候数据，并满足动力学和运动学约束的准静态原始方程海洋环流模式。重建的环流与测量结果非常一致，其特征是，对于平均气候条件、正AO指数和负AO指数，卡拉门的流入量分别为0.63、0.8、0.51 Sv，新地岛和弗朗茨约瑟夫地之间的流入量分别为1.18、1.1、1.12 Sv。这些情况下的主要水流出区域是圣安娜海槽（1.17、1.21、1.34 Sv）和Vilkitsky/Shokalsky海峡（0.52、0.7、0.51 Sv）。平均气候夏季的优化速度模式揭示了喀拉海中部（淡水流入区，ROFI区）的强反气旋环流，并通过ADCP调查和实验室模拟得到证实。这种环流在高、低AO阶段都很明显，但在正AO阶段，它相对于其气候中心向西移动了约200公里。在负AO位相期间，ROFI位置接近其气候位置。将变分数据同化方法的结果与汉堡大陆架海洋模型（HAMSOM）和海军研究生院18 km分辨率（NPS-18）模型的模拟数据进行比较，以验证这些模型。
[1] The summer circulations and hydrographic fields of the Kara Sea are reconstructed for mean, positive and negative Arctic Oscillation regimes employing a variational data assimilation technique which provides the best fit of reconstructed fields to climatological data and satisfies dynamical and kinematic constraints of a quasi-stationary primitive equation ocean circulation model. The reconstructed circulations agree well with the measurements and are characterized by inflow of 0.63, 0.8, 0.51 Sv through Kara Gate and 1.18, 1.1, 1.12 Sv between Novaya Zemlya and Franz Josef Land, for mean climatologic conditions, positive and negative AO indexes, respectively. The major regions of water outflow for these regimes are the St. Anna Trough (1.17, 1.21, 1.34 Sv) and Vilkitsky/Shokalsky Straits (0.52, 0.7, 0.51 Sv). The optimized velocity pattern for the mean climatological summer reveals a strong anticyclonic circulation in the central part of the Kara Sea (Region of Fresh Water Inflow, ROFI zone) and is confirmed by ADCP surveys and laboratory modeling. This circulation is well pronounced for both high and low AO phases, but in the positive AO phase it is shifted approximately 200 km west relatively to its climatological center. During the negative AO phase the ROFI locaion is close to its climatological position. The results of the variational data assimilation approach were compared with the simulated data from the Hamburg Shelf Ocean Model (HAMSOM) and Naval Postgraduate School 18 km resolution (NPS-18) model to validate these models.