The Icelandic Low as a Predictor of the Gulf Stream North Wall Position
The Icelandic Low as a Predictor of the Gulf Stream North Wall Position
复制标题
冰岛低压作为墨西哥湾流北壁位置的预测
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
R. Wilson
中科院分区：
文献类型：
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作者：
A. Sanchez‐Franks;S. Hameed;R. Wilson
墨西哥湾流在哈特拉斯角以东的北墙标志着北部斜坡海和墨西哥湾流本身之间速度和水性质的突然变化。由泰勒和斯蒂芬斯，称为湾流北壁（GSNW），北壁位置的指数，冰岛低（IL）压力异常和纵向位移的年际变化进行了分析。海面温度（SST）复合材料表明，当IL压力非常低时，拉布拉多海和大浅滩南部的温度较低。两年后，温暖的SST异常出现在北方再循环环流和GSNW北移发生。在冬季，当IL偏西时，SST也会发生类似的变化，导致3年后GSNW向北移动。虽然在计算中使用了IL和GSNW之间的2年和3年的时间滞后，但结果表明，相对于每个大气变量的滞后是不确定的。
AbstractThe Gulf Stream’s north wall east of Cape Hatteras marks the abrupt change in velocity and water properties between the slope sea to the north and the Gulf Stream itself. An index of the north wall position constructed by Taylor and Stephens, called Gulf Stream north wall (GSNW), is analyzed in terms of interannual changes in the Icelandic low (IL) pressure anomaly and longitudinal displacement. Sea surface temperature (SST) composites suggest that when IL pressure is anomalously low, there are lower temperatures in the Labrador Sea and south of the Grand Banks. Two years later, warm SST anomalies are seen over the Northern Recirculation Gyre and a northward shift in the GSNW occurs. Similar changes in SSTs occur during winters in which the IL is anomalously west, resulting in a northward displacement of the GSNW 3 years later. Although time lags of 2 and 3 years between the IL and the GSNW are used in the calculations, it is shown that lags with respect to each atmospheric variable are statistica...