Variations in the Central Mode Water in the North Pacific as a manifestation of the Pacific Decadal Oscillation

IF 1.3 4区 地球科学 Q4 OCEANOGRAPHY
Iwasaka Naoto, Fumiaki Kobashi, Yoshimi Kawai
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引用次数: 0

Abstract

The North Pacific Central Mode Water (CMW) is examined from the viewpoint of its volume variations. The volume of the CMW layers thicker than \(150 m\) is used as an index of CMW variations, which successfully represents the year-to-year and decadal variations in the CMW volume. The CMW index shows the variation close to that of the Pacific Decadal Oscillation (PDO). The CMW variation is strongly tied with large-scale, dominant variations in sea surface temperature (SST), surface dynamic height (SDH), and sea surface height (SSH) anomalies in the North Pacific, with a significant correlation with the PDO. Year-to-year and decadal variations of CMW volume in May to July are significantly correlated with the wintertime Aleutian Low and 500\(hPa\) geopotential height variations, which indicates that the Aleutian Low induces the eastward extension/retreat of the strong winter westerlies and resultant net surface heat flux anomaly over the CMW distribution region. Thus, the CMW volume variation can be regarded as a significant manifestation of the PDO. The SST, SDH, and SSH anomalies are associated with the surface cooling in the northern sector of the CMW distribution region. On the other hand, the SDH and SSH anomalies throughout a year and the SST anomaly in the cold season in the southeastern sector of the CMW region are formed due to the heaving of isopycnal surfaces in the subsurface layer above the CMW in response to its volume variations.

Abstract Image

北太平洋中央模式水的变化是太平洋十年涛动的一种表现形式
从体积变化的角度研究了北太平洋中央模式水(CMW)。用厚度大于(150 米)的中模水层的体积作为中模水变化指数,成功地表示了中模水体积的年际和旬际变化。CMW指数的变化接近于太平洋十年涛动(PDO)的变化。CMW 的变化与北太平洋海面温度(SST)、海面动态高度(SDH)和海面高度(SSH)异常的大尺度主导变化密切相关,与 PDO 有显著的相关性。5-7月CMW量的年际和旬际变化与冬季阿留申低纬度和500(hPa)位势高度变化显著相关,这表明阿留申低纬度诱导了冬季强西风的东伸/后退,并由此导致CMW分布区的净表面热通量异常。因此,CMW 量变可视为 PDO 的重要表现。SST 、SDH 和 SSH 的异常与 CMW 分布区北部的地表冷却有关。另一方面,CMW 区域东南部全年的 SDH 和 SSH 异常以及寒冷季节的 SST 异常则是由于 CMW 上方次表层的等压面随 CMW 体积变化而翻腾形成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Oceanography
Journal of Oceanography 地学-海洋学
CiteScore
3.50
自引率
13.00%
发文量
42
审稿时长
6-12 weeks
期刊介绍: The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.
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