赤道气团是形成于赤道附近洋面上的气团，源地分布在南北纬10°之间的范围内。在赤道气团控制下，天气闷热、潮湿、多雷暴。对我国夏季降水有贯要贡献。
在热带地区，一整年都是流感好发季节，倘若赤道附近的热带性气团向两极扩张，一些季节错乱的地区便可能发觉流感疫期已稍稍延长。
Influenza is a year-round event in the tropics. If the tropical airmass around the Earth's equator expands, as new areas lose their seasons they may also begin to see influenza year-round.
但是，新的研究认为实际存在四种不同的大气团，即赤道以北两个，赤道以南两个。
But the new study posits that there are actually four distinct air masses, two north of the equator and two south.
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