The present study investigates the roles of solar radiation and monsoon wind in annual and semiannual variations of size and intensity of the Indo-western Pacific warm pool. The Indo-western Pacific warm pool is divided into four sectors with the equator and 100°E (north of the equator) and 135°E (south of the equator) longitude as the demarcations. These sectors display different seasonal variations in size and intensity and different roles of surface heat flux and oceanic processes. The size of the North Indian Ocean warm pool displays a semiannual variation with two peaks in May and October, while that in the other three sectors shows an annual variation. These features are attributable to a dominant role of solar radiation in the four sectors and an additional effect of the Asian monsoon in the North Indian Ocean sector. The intensity of the warm pool displays semianunal variations, with two peaks in May and August in the North Indian Ocean sector, April and November in the South Indian Ocean sector, May–June and September in the North Pacific Ocean sector and December and April in the South Pacific Ocean sector. The semiannual feature is associated with two effects of monsoon winds: wind-induced ocean advection and convection-related cloud-radiation changes. These two changes induce a decrease of sea surface temperature during the monsoon period, leading to the formation of semiannual variations in the size and intensity of the warm pool.

中文翻译：

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不同部门印度西太平洋暖池规模和强度的季节性变化

本研究调查了太阳辐射和季风在印度-西太平洋暖池大小和强度的年度和半年度变化中的作用。印西太平洋暖池以赤道和100°E（赤道以北）和135°E（赤道以南）经度为界，分为四个扇区。这些部门在规模和强度方面表现出不同的季节性变化，以及地表热通量和海洋过程的不同作用。北印度洋暖池面积呈半年变化，5、10月有两个高峰，其他三个扇区呈年变化。这些特征归因于太阳辐射在四个部门中的主导作用以及亚洲季风在北印度洋部门的额外影响。暖池强度呈现半年变化，北印度洋海域在 5 月和 8 月出现两个峰值，南印度洋海域在 4 月和 11 月出现峰值，北太平洋海域在 5-6 月和 9 月出现峰值，在南太平洋板块。半年特征与季风的两种影响有关：风引起的海洋平流和对流相关的云辐射变化。这两种变化导致季风期间海面温度下降，导致暖池大小和强度形成半年变化。北太平洋地区 5 月至 6 月和 9 月，南太平洋地区 12 月和 4 月。半年特征与季风的两种影响有关：风引起的海洋平流和对流相关的云辐射变化。这两种变化导致季风期间海面温度下降，导致暖池大小和强度形成半年变化。北太平洋地区 5 月至 6 月和 9 月，南太平洋地区 12 月和 4 月。半年特征与季风的两种影响有关：风引起的海洋平流和对流相关的云辐射变化。这两种变化导致季风期间海面温度下降，导致暖池大小和强度形成半年变化。