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首页> 外文期刊>Journal of oceanography >Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region
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Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region

机译：黑潮延伸区环的气候平均特征和年际至年代际变化

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摘要

This study examines the climatological mean features of oceanic rings shed from the Kuroshio Extension (KE) jet and their interannual to decadal variability using satellite altimeter observations from October 1992 to December 2010. To objectively capture ring shedding from the KE jet, a new method that consists of the detection of the jet length changes and the tracking of a ring is proposed. Spatial distribution of the ring formations in the KE region indicates that cyclonic (cold-core) rings were most frequently formed in the upstream region between 143A degrees and 147A degrees E around the steady meander of the KE jet. In contrast, most of anticyclonic (warm-core) rings were formed in the downstream region west of the Shatsky Rise. These pinched-off rings in both the upstream and downstream regions generally propagated westward, but about two-thirds of the rings were reabsorbed by the jet. Nevertheless, about one-fourth of the meridional eddy heat transport at the latitude of the KE resulted from the rings that are not reabsorbed by the jet. The number of ring formations showed substantial interannual to decadal variability. In the upstream and downstream KE region, decadal and interannual variability was dominant, respectively. These ring formation fluctuations were negatively correlated with the strength of the KE jet. It is also revealed that the ring formation variations play an important role in sea surface temperature changes north of the KE jet.
机译：这项研究使用1992年10月至2010年12月的卫星高度计观测资料，研究了黑潮扩展（KE）喷流所散发的海洋环的气候平均特征及其年际至年代际的变化。包括对射流长度变化的检测和对环的跟踪。 KE区域中环形成的空间分布表明，气旋（冷芯）环最常见于KE射流稳定曲折附近143A度和147A度E之间的上游区域。相反，大多数反气旋（暖芯）环形成在Shatsky Rise以西的下游区域。这些在上游和下游区域被夹断的环通常向西传播，但是大约三分之二的环被射流重新吸收。然而，KE纬度上子午涡流传热的约四分之一是由于环流未被射流重新吸收而产生的。环形成的数量显示出年际到年代际的重大变化。在KE上游和下游地区，年代际和年际变化分别占主导地位。这些成环波动与KE射流强度负相关。还揭示出，成环变化在KE射流以北海面温度变化中起重要作用。

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