Regional tropical precipitation change mechanisms in ECHAM4/OPYC3 under global warming

Chia Chou, J. David Neelin, Jien-Yi Tu, Cheng Ta Chen

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Mechanisms of global warming impacts on regional tropical precipitation are examined in a coupled atmosphere-ocean general circulation model (ECHAM4/OPYC3). The pattern of the regional tropical precipitation changes, once established, tends to persist, growing in magnitude as greenhouse gases increase. The sulfate aerosol induces regional tropical precipitation anomalies similar to the greenhouse gases but with opposite sign, thus reducing the early signal. Evidence for two main mechanisms, the upped-ante and the anomalous gross moist stability (M′) mechanisms (previously proposed in an intermediate complexity model), is found in this more comprehensive coupled general circulation model. Preferential moisture increase occurs in convection zones. The upped-ante mechanism signature of dry advection from nonconvective regions is found in tropical drought regions on the margins of convection zones. Here advection in both the atmospheric boundary layer and lower free troposphere are found to be important, with an additional contribution from horizontal temperature transport in some locations. The signature of the M' mechanism-moisture convergence due to increased moisture in regions of large mean vertical motion - enhances precipitation within strong convective regions. Ocean dynamical feedbacks can be assessed by net surface flux, the main example being the El Niño-like shift of the equatorial Pacific convection zone. Cloud-radiative feedbacks are found to oppose precipitation anomalies over ocean regions.

Original languageEnglish
Pages (from-to)4207-4223
Number of pages17
JournalJournal of Climate
Volume19
Issue number17
DOIs
Publication statusPublished - 2006 Sep 1

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global warming
convection
moisture
general circulation model
advection
ocean
greenhouse gas
anomaly
surface flux
troposphere
boundary layer
drought
aerosol
sulfate
atmosphere
temperature

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Chou, Chia ; Neelin, J. David ; Tu, Jien-Yi ; Chen, Cheng Ta. / Regional tropical precipitation change mechanisms in ECHAM4/OPYC3 under global warming. In: Journal of Climate. 2006 ; Vol. 19, No. 17. pp. 4207-4223.
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Regional tropical precipitation change mechanisms in ECHAM4/OPYC3 under global warming. / Chou, Chia; Neelin, J. David; Tu, Jien-Yi; Chen, Cheng Ta.

In: Journal of Climate, Vol. 19, No. 17, 01.09.2006, p. 4207-4223.

Research output: Contribution to journalArticle

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