Barrier layer in the North Pacific subtropical gyre
Barrier layer in the North Pacific subtropical gyre
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DOI：
10.1029/2003gl018590
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发表时间：
2004-03
影响因子：
5.2
通讯作者：
Kanako Sato;T. Suga;K. Hanawa
中科院分区：
文献类型：
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作者：
Kanako Sato;T. Suga;K. Hanawa
通过分析2003年8月Argo浮标获得的所有可用的温度/盐度廓线，我们评估了北太平洋副热带环流的障碍层（BLs）。在10° ~ 25 ° N的剖面中，有20.5%的边界层厚度大于10 m。1 - 5月边界层的相对频率和典型厚度分别较高和较大，这与以往报道的气候边界层在冬春季的分布较广相一致。由于冬季蒸发量大于降水量，我们推断，至少在冬季，北太平洋热带高盐水的俯冲是10°-25 ° N边界层形成的原因。斑块发生的BL检测的浮子，和局部局限的强烈的盐度锋在几个天气部分，表明BL的俯冲形成的尖锐的盐度锋。
By analyzing all the available temperature/salinity profiles obtained by Argo floats as of August 2003, we evaluate the barrier layers (BLs) in the North Pacific subtropical gyre. 20.5% of the profiles at 10°–25°N have BLs with thickness greater than 10 m. The relative frequency and typical thickness of the BLs are generally higher and greater, respectively, during January–May, which are consistent with the wider distribution of the previously reported climatological BL in winter and spring. Because evaporation dominates over precipitation in winter, we infer that the subduction of high saline water, known as North Pacific Tropical Water, is responsible for the BL formation in 10°–25°N, at least in winter. Patchy occurrence of the BLs detected by the floats, and locally confined intense salinity fronts in several synoptic sections, suggest that the BLs are formed by the subduction at those sharp salinity fronts.