Tropical Meteorology & Climate: Hadley Circulation

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The Hadley circulation, a prominent circulation feature characterized by rising air near the Equator and sinking air in the subtropics, defines the position of dry subtropical areas and is a fundamental regulator of the earth's energy and momentum budgets. The character of the Hadley circulation, and its related precipitation regimes, exhibits variation and change in response to both climate variability and radiative forcing changes. The strength and position of the Hadley circulation change from year to year paced by El Niño and La Niña events. Over the last few decades of the twentieth century, the Hadley cell has expanded poleward in both hemispheres, with changes in atmospheric composition (including stratospheric ozone depletion and greenhouse gas increases) thought to have contributed to its expansion. This article introduces the basic phenomenology and driving mechanism of the Hadley circulation and discusses its variations under both natural and anthropogenic climate forcings.

Original languageEnglish (US)
Title of host publicationEncyclopedia of Atmospheric Sciences
Subtitle of host publicationSecond Edition
PublisherElsevier Inc.
Pages113-120
Number of pages8
ISBN (Electronic)9780123822260
ISBN (Print)9780123822253
DOIs
StatePublished - Jan 1 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Baroclinic instability
  • Climate change
  • El Niño
  • Hadley circulation
  • ITCZ
  • Thermal wind

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  • Cite this

    Lu, J., & Vecchi, G. A. (2015). Tropical Meteorology & Climate: Hadley Circulation. In Encyclopedia of Atmospheric Sciences: Second Edition (pp. 113-120). Elsevier Inc.. https://doi.org/10.1016/B978-0-12-382225-3.00161-4