globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-011-1258-z
Scopus记录号: 2-s2.0-84861358499
论文题名:
Influences of tropical-extratropical interaction on the multidecadal AMOC variability in the NCEP climate forecast system
作者: Huang B.; Hu Z.-Z.; Schneider E.K.; Wu Z.; Xue Y.; Klinger B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期:3
起始页码: 531
结束页码: 555
语种: 英语
英文摘要: We have examined the mechanisms of a multidecadal oscillation of the Atlantic Meridional Overturning Circulation (AMOC) in a 335-year simulation of the Climate Forecast System (CFS), the climate prediction model developed at the National Centers for Environmental Prediction (NCEP). Both the mean and seasonal cycle of the AMOC in the CFS are generally consistent with observation-based estimates with a maximum northward volume transport of 16 Sv (106 m3/s) near 35°N at 1. 2 km. The annual mean AMOC shows an intermittent quasi 30-year oscillation. Its dominant structure includes a deep anomalous overturning cell (referred to as the anomalous AMOC) with amplitude of 0.6 Sv near 35°N and an anomalous subtropical cell (STC) of shallow overturning spanning across the equator. The mechanism for the oscillation includes a positive feedback between the anomalous AMOC and surface wind stress anomalies in mid-latitudes and a negative feedback between the anomalous STC and AMOC. A strong AMOC is associated with warm sea surface temperature anomaly (SSTA) centered near 45°N, which generates an anticyclonic easterly surface wind anomaly. This anticyclonic wind anomaly enhances the regional downwelling and reinforces the anomalous AMOC. In the mean time, a wind-evaporation-SST (WES) feedback extends the warm SSTA to the tropics and induces a cyclonic wind stress anomaly there, which drives a tropical upwelling and weakens the STC north of the equator. The STC anomaly, in turn, drives a cold upper ocean heat content anomaly (HCA) in the northern tropical Atlantic and weakens the meridional heat transport from the tropics to the mid-latitude through an anomalous southward western boundary current. The anomalous STC transports cold HCA from the subtropics to the mid-latitudes, weakening the mid-latitude deep overturning. © 2011 Springer-Verlag.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55209
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作者单位: Department of Atmospheric, Oceanic, and Earth Sciences, College of Science, Gorge Mason University, 4400 University Drive, Fairfax, VA 22030, United States; Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, 4041 Powder Mill Road, #302, Calverton, MD 20705, United States; Climate Prediction Center, National Centers for Environmental Prediction/NOAA, 5200 Auth Road, Camp Springs, MD 20746, United States; Department of Earth, Ocean, and Atmospheric Science, Center for Ocean-Atmospheric Prediction Studies, Florida State University, 1017 Academic Way, Tallahassee, FL 32306, United States

Recommended Citation:
Huang B.,Hu Z.-Z.,Schneider E.K.,et al. Influences of tropical-extratropical interaction on the multidecadal AMOC variability in the NCEP climate forecast system[J]. Climate Dynamics,2012-01-01,39(3)
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