首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Winter-to-winter recurrence and non-winter-to-winter recurrence of SST anomalies in the central North Pacific
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Winter-to-winter recurrence and non-winter-to-winter recurrence of SST anomalies in the central North Pacific

机译:北太平洋中部SST异常的冬至冬季复发和非冬至冬季复发

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All previous studies of the winter-to-winter recurrence (WWR) of sea surface temperature anomalies (SSTA) have focused on mean climatic characteristics. Here, interannual variability of the SSTA WWR in the central North Pacific (CNP) is studied. The SSTA WWR displays a strong interannual variability in the CNP. The relative roles of atmospheric forcing and the oceanic reemergence mechanism are investigated by comparing SSTA WWR years and non-WWR years. Oceanic reemergence mechanism operates every year, the SSTA in the following winter, however, depends not only on the oceanic entrainment but also the atmospheric forcing, which exhibits substantial interannual variability. During SSTA WWR years, atmospheric circulation anomalies also exhibit the WWR phenomenon. Atmospheric forcing as well as the oceanic reemergence mechanism can act synergistically to create SSTA in the following winter with the same sign. During SSTA non-WWR years, winter atmospheric circulation anomalies do not recur in the following winter, and the following winter has opposing atmospheric forcing on SSTA. Although the reemergence mechanism is likely still operating, the anomalous heating supplied by the oceanic reemergence mechanism is smaller than that coming through the atmospheric forcing. Overall, the WWR in the CNP is an evolutional characteristic of the whole air-sea system with the seasons, and the WWR of atmospheric circulation anomalies and its forcing play an important role in the SSTA WWR.
机译:以前所有有关海表温度异常(SSTA)的冬季到冬季复发(WWR)的研究都集中在平均气候特征上。在这里,研究了北太平洋中部(CNP)SSTA WWR的年际变化。 SSTA WWR在CNP中显示很强的年际变化。通过比较SSTA WWR年和非WWR年,研究了大气强迫和海洋重新出现机制的相对作用。海洋新生机制每年都会运行,SSTA在接下来的冬天每年都在运行,但是它不仅取决于海洋夹带,还取决于大气强迫,而大气强迫表现出很大的年际变化。在SSTA WWR年中,大气环流异常也表现出WWR现象。大气强迫和海洋新生机制可以协同作用,在接下来的冬天以相同的符号产生SSTA。在非SSTA的SSTA期间,冬季的大气环流异常不会在接下来的冬季再次发生,并且接下来的冬季对SSTA的大气强迫作用相反。尽管回潮机制可能仍在运行,但海洋回潮机制所提供的异常热量要小于大气强迫产生的异常热量。总体而言,CNP中的WWR是整个海-气系统随季节变化的演化特征,大气环流异常的WWR及其强迫在SSTA WWR中起着重要作用。

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