On the genesis of the equatorial annual cycle

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Journal of Climate

DOI:https://doi.org/10.1175/1520-0442(1994)007<2008:OTGOTE>2.0.CO;2· OSTI ID:53427

Xie, S ^[1]

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1. Princeton Univ., Princeton, NJ (United States)

A linear theory is proposed that can explain both the period and the westward propagation of the equatorial annual cycles in the Sea Surface Temperature (SST) and zonal wind. A coupled model linearized about a mean state of the air-sea system is used. This model allows the surface winds to directly change the SST through surface evaporation and vertical mixing, in contrast to the formulation of the conventional air-sea coupling models that emphasize the effects of winds on ocean dynamics. It is demonstrated that the characteristics of the equatorial seasonal cycle, including its period, phase, and amplitude, are determined to a large exent by the mean state of the air-sea coupling system. The meridional wind, which is specified here, is the most important forcing for the annual cycle in SST, suggesting that the equatorial annual cycle is the response to an annual solar forcing in the off-equatorial regions.

• OSTI ID: 53427
• Journal Information: Journal of Climate, Journal Name: Journal of Climate Journal Issue: 12 Vol. 7; ISSN 0894-8755; ISSN JLCLEL
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ANNUAL VARIATIONS
EARTH ATMOSPHERE
EVAPORATION
GENERAL CIRCULATION MODELS
HEAT FLUX
SEAS