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Asymmetry of the Intertropical Convergence Zone : ウィキペディア英語版 | Asymmetry of the Intertropical Convergence Zone
There are a number of explanations of the asymmetry of the Intertropical Convergence Zone (ITCZ), known by sailors as The Doldrums. ==Asymmetrical distribution of continents== The ITCZ would be expected to overlie the geographic equator according to symmetric solar radiation. However, the ITCZ is mostly perennial in the northern hemisphere and in the eastern Pacific and Atlantic Oceans. It was originally explained by the asymmetrical distribution of continents. However, the distribution of land and ocean is severely asymmetric in the Indian Ocean, yet the ITCZ moves back and forth there between the southern and northern hemispheres.〔(【引用サイトリンク】 url =http://iprc.soest.hawaii.edu/users/xie/ITCZ.html )〕 Continents surround the Indian Ocean and monsoons prevail. Where the thermocline is deeper indicates that there is a weaker interaction between atmosphere and ocean. Due to the relatively small scale and deep thermocline in the Indian Ocean, there will be less asymmetric effects. In the middle latitude Pacific and Atlantic Ocean, because of the large scale easterly wind system and the western continents boundaries, the thermocline is definitely shallower in eastern part. Thus, the asymmetry is obvious in the eastern Pacific and Atlantic Ocean. There are two factors that are acknowledged by oceanographers and meteorologists: the interactions between ocean and atmosphere and the geometries of the continents.
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