Atmosphere drives recent interannual variability of the Atlantic meridional overturning circulation at 26.5°N

被引：82

作者：

Roberts, C. D. ^{[1
]}

Waters, J. ^{[2
]}

Peterson, K. A. ^{[1
]}

Palmer, M. D. ^{[1
]}

McCarthy, G. D. ^{[3
]}

Frajka-Williams, E. ^{[4
]}

Haines, K. ^{[5
]}

Lea, D. J. ^{[2
]}

Martin, M. J. ^{[2
]}

Storkey, D. ^{[2
]}

Blockley, E. W. ^{[2
]}

Zuo, H. ^{[6
]}

机构：

[1] Met Off, Hadley Ctr, Exeter EX1 3PB, Devon, England

[2] Met Off, Exeter EX1 3PB, Devon, England

[3] Natl Oceanog Ctr, Southampton, Hants, England

[4] Univ Southampton, Dept Ocean & Earth Sci, Southampton, Hants, England

[5] Univ Reading, Dept Meteorol, Reading, Berks, England

[6] European Ctr Medium Range Weather Forecasts, Reading RG2 9AX, Berks, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2013年 / 40卷 / 19期

基金：

英国自然环境研究理事会; 美国国家科学基金会;

关键词：

AMOC; variability; ocean model; data assimilation; ocean circulation; Atlantic meridional overturning circulation; NORTH-ATLANTIC; PREDICTION; TRANSPORTS; COLLAPSE; IMPACTS;

D O I：

10.1002/grl.50930

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Atlantic meridional overturning circulation (AMOC) has been observed at 26.5 degrees N since 2004. During 2009/2010, there was a transient 30% weakening of the AMOC driven by anomalies in geostrophic and Ekman transports. Here, we use simulations based on the Met Office Forecast Ocean Assimilation Model (FOAM) to diagnose the relative importance of atmospheric forcings and internal ocean dynamics in driving the anomalous geostrophic circulation of 2009/2010. Data-assimilating experiments with FOAM accurately reproduce the mean strength and depth of the AMOC at 26.5 degrees N. In addition, agreement between simulated and observed stream functions in the deep ocean is improved when we calculate the AMOC using a method that approximates the observing array at 26.5 degrees N. The main features of the geostrophic circulation anomaly are captured by an ensemble of simulations without data assimilation. These model results suggest that the atmosphere played a dominant role in driving recent interannual variability of the AMOC.

引用

页码：5164 / 5170

页数：7

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