Atmospheric controlled freshwater release at the Laptev Sea continental margin
Atmospheric controlled freshwater release at the Laptev Sea continental margin
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DOI：
10.3402/polar.v30i0.5858
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发表时间：
2011-01-01
期刊：
影响因子：
1.9
通讯作者：
Andersen, Nils
中科院分区：
文献类型：
--
作者：
Bauch, Dorothea;Groeger, Matthias;Andersen, Nils
1993年和1995年夏季以及2005年和2006年南森和阿蒙森盆地观测系统考察期间，根据拉普特夫海大陆边缘的欧亚盆地的O-18三角洲和盐度数据得出的河水和海冰融水库存值存在相当大的年际差异。在所研究的所有年份中，河流和海冰融化水库存的年度不同模式仍然密切相关，这表明在相对较浅的拉普特夫海架上，河水和海冰形成的来源区域和传输机制基本上相似。一个简单的仅基于风强迫的地表拉格朗日粒子的Ekman轨迹模式，可以解释在风型和涡度显著不同的年份之间观察到的主要特征，也可以解释在大致相似的近海风场下观察到的多年河水分布的差异。基于这种简化轨迹模型的指数与涡度指数非常相似，但更好地反映了不同年份的陆架水文状况。这一指数与北极涛动无关，而是与当地振荡模式有关，后者在年度时间尺度上控制着欧亚盆地主要淡水水源的外流和分布。
Considerable interannual differences were observed in river water and sea-ice meltwater inventory values derived from delta O-18 and salinity data in the Eurasian Basin along the continental margin of the Laptev Sea in the summers of 1993 and 1995, and in the summers of 2005 and 2006 during Nansen and Amundsen Basins Observational system (NABOS) expeditions. The annually different pattern in river and sea-ice meltwater inventories remain closely linked for all of the years studied, which indicates that source regions and transport mechanisms for both river water and sea-ice formation are largely similar over the relatively shallow Laptev Sea Shelf. A simple Ekman trajectory model for surface Lagrangian particles based solely on wind forcing can explain the main features observed between years with significantly different wind patterns and vorticities, and can also explain differences in river water distributions observed for years with a generally similar offshore wind setting. An index based on this simplified trajectory model is rather similar to the vorticity index, but reflects the hydrology on the shelf better for distinctive years. This index is not correlated with the Arctic Oscillation, but rather with a local mode of oscillation, which controls the outflow and distribution of the Eurasian Basin major freshwater source on an annual timescale.