Satellite observations of the southeast Pacific intertropical convergence zone during 1993-1998

David Halpern*, Chih Wen Hung

*此作品的通信作者

研究成果: 雜誌貢獻回顧評介論文同行評審

20 引文 斯高帕斯(Scopus)

摘要

An intertropical convergence zone in the southeast Pacific Ocean is described from monthly mean 1° × 1° ocean vector wind, rainfall, sea surface temperature, and integrated water vapor measurements recorded from satellites. Time interval of the investigation was January 1993 to December 1998, when ocean and atmosphere conditions during 1993-1996 were normal compared to the 1997-1998 El Niño. The southeast Pacific intertropical convergence zone (SITCZ) occurred in March-April at 8° S-2° S, 130° W-90° W. During 1993-1996 the average March-April values of SITCZ surface wind convergence, rain rate, sea surface temperature, and integrated water vapor were 3.3 × 10-6 s-1, 3.3 mm d-1, 27.3°C, and 45.3 mm, respectively. A statistical model of the monthly mean observations predicted rainfall greater than the 2 mm d-1 threshold when surface wind convergence was greater than the 1.5 × 10-6 s-1 threshold and sea surface temperature was above 27°C. During non-El Niño conditions, SITCZ sea surface temperature was greater than sea surface temperature in the 2° S-2° N equatorial band, with maximum difference in March-April which would create a surface wind convergence larger in March-April compared to other months. The Intertropical Convergence Zone (ITCZ), which occurred north of the equator throughout the year, and the SITCZ were separated by divergent wind, low (<2 mm d-1) rainfall, and cold (<27° C) surface water, except during the intense 1998 El Niño. The rain rate of the ITCZ was minimum in March-April during 1993-1996 and comparable to the SITCZ rain rate.

原文英語
文章編號2000JD000056
頁(從 - 到)28107-28112
頁數6
期刊Journal of Geophysical Research Atmospheres
106
發行號D22
DOIs
出版狀態已發佈 - 2001 十一月 27
對外發佈

ASJC Scopus subject areas

  • 地球物理
  • 森林科學
  • 海洋學
  • 海洋科學
  • 生態學
  • 水科學與技術
  • 土壤科學
  • 地球化學與岩石學
  • 地表過程
  • 大氣科學
  • 地球與行星科學(雜項)
  • 空間與行星科學
  • 古生物學

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