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Earth and Space Sciences · 术语表

什么是 Intertropical convergence zone？

Definition 28.15 University Earth and Space Sciences — Year 1 · 第 28 章 — The General Circulation of the Atmosphere

The intertropical convergence zone (ITCZ) is the belt near the equator where the north-easterly and south-easterly trade winds converge, forming an often continuous band of cloud and thunderstorms. It is the rising branch of the two Hadley cells; the light winds of its surface are the doldrums of the sailors.

The intertropical convergence zone over the eastern Pacific: a line of bright clouds crossing the ocean north of the equator, with Central and South America to the right. The image combines cloud data from the GOES-11 geostationary satellite with colours of the land cover. (NASA Earth Observatory, public domain, via Wikimedia Commons.)

The latitude of the zonal-mean precipitation maximum, month by month, between 20 S and 20 N: the intertropical convergence zone migrates north in the northern summer and south in the southern summer, two or three months behind the Sun. NCEP-NCAR Reanalysis 1, means 1991–2020, data provided by the NOAA PSL. — The latitude of the zonal-mean precipitation maximum, month by month, between $20{}^{\circ}$ S and $20{}^{\circ}$ N: the intertropical convergence zone migrates north in the northern summer and south in the southern summer, two or three months behind the Sun. NCEP-NCAR Reanalysis 1, means 1991–2020, data provided by the NOAA PSL.

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