Abrupt seasonal variation of the ITCZ and the Hadley circulation

Details Abrupt seasonal variation of the ITCZ and the Hadley circulation Abrupt seasonal variation of the ITCZ and the Hadley circulation

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3418814h&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 18, CiteID L18814

Physics

Geophysics

5

Global Change: Climate Dynamics (0429, 3309), Global Change: Atmosphere (0315, 0325), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), History Of Geophysics: Atmospheric Sciences, Global Change: Regional Climate Change

Scientific paper

Using Global Precipitation Climatology Project (GPCP) daily data, we show that the seasonal migration of the global zonal-mean intertropical convergence zone (ITCZ) is not smooth, but jumps from the winter hemisphere to the summer hemisphere. The abrupt migration is within 10 days. Detailed analyses reveal that the phenomenon of the abrupt seasonal migration of the ITCZ mainly exists over particular tropical domains, such as Indian Ocean, western and central Pacific, and South America, which gives the rise of the jump of the global zonal-mean ITCZ. Because the ITCZ constitutes the ascending branch of the Hadley circulation, we also examine whether there exists such an abrupt seasonal change in the Hadley circulation. It is found that the intensity of the Hadley cells evolves smoothly with time. However, the horizontal scales of the Hadley cells demonstrate abrupt seasonal changes, corresponding to the abrupt seasonal migration of the global ITCZ. The winter cell extends rapidly across the equator, while the summer cell rapidly narrows. This suggests that the solsticial cell is the dominant component of the Hadley circulation, and that the equinoctial symmetric pattern is ephemeral.

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