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基于国际Argo资料中心提供的从2004年1月至2007年10月的浮标剖面资料,对西北太平洋模态水的时空变化特征进行分析。结合WOA01(the World Ocean Atlas 2001)资料,选定模态水主要形成区(30°～35°N,140°～155°E)作为研究区域,利用3月份的平均资料,给出西北太平洋模态水的空间结构为:北边界位于34.5°N附近,南边界可达30°N以南,东边界位于151.5°E,西边界可达140°E以西,深度为350m以浅。通过对模态水核心区的逐月资料分析,揭示了其温度、盐度等的季节变化,并提出一种判别模态水范围的盐度判别法。结合海平面高度异常变化,初步分析了涡旋对模态水的影响,发现涡旋只能暂时改变核心区模态水的温盐结构,之后该区域模态水将基本恢复到正常状态。根据模态水2004-2007年的水文数据特点,发现在过去4a中模态水性质基本稳定,变化很小。
Based on the data of the buoy profile from January 2004 to October 2007 provided by the International Argo Data Center, the spatio-temporal variations of the modeled waters in the western North Pacific are analyzed. According to the data of WOA01 (the World Ocean Atlas 2001), the main forming zone of mode water (30 ° -35 ° N, 140 ° -155 ° E) is selected as the study area. Based on the average data of March, the Northwest Pacific mode The spatial structure of the state water is that the north boundary is located near 34.5 ° N, the south boundary is up to 30 ° N, the east boundary is located at 151.5 ° E, the west boundary is up to 140 ° E, and the depth is 350 m. Through the monthly data analysis of the modal water core area, the seasonal variations of temperature and salinity were revealed, and a salinity discrimination method was proposed to determine the range of modal water. Combined with the anomalous sea level anomalies, the influence of eddies on the modal water is analyzed. It is found that the vortex only temporarily changes the thermohaline structure of the modal water in the core area, and then the modal water in the area will basically return to the normal state. According to the characteristics of hydrological data of modal water from 2004 to 2007, it was found that the modal water properties in the past 4 years were basically stable with little change.