DOI: 10.1175/JCLI-D-18-0311.1
Scopus记录号: 2-s2.0-85061816342
论文题名: Atmospheric origins of variability in the south atlantic meridional overturning circulation
作者: Smith T. ; Heimbach P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 5 起始页码: 1483
结束页码: 1500
语种: 英语
Scopus关键词: Inverse problems
; Wind stress
; Atlantic meridional overturning circulations
; Atmospheric forcing
; Domain of influences
; General circulation model
; Interannual variability
; Massachusetts Institute of Technology
; Observation networks
; Stress perturbations
; Oceanography
英文摘要: Insights from the RAPID-MOCHA observation network in the North Atlantic have motivated a recent focus on the South Atlantic, where water masses are exchanged with neighboring ocean basins. In this study, variability in the South Atlantic meridional overturning circulation (SAMOC) at 34°S is attributed to global atmospheric forcing using an inverse modeling approach. The sensitivity of the SAMOC to atmospheric state variables is computed with the adjoint of the Massachusetts Institute of Technology general circulation model, which is fit to 20 years of observational data in a dynamically consistent framework. The dynamical pathways highlighted by these sensitivity patterns show that the domain of influence for theSAMOCis broad, covering neighboring ocean basins even on short time scales. This result differs from what has previously been shown in the North Atlantic, where Atlantic meridional overturning circulation (AMOC) variability is largely governed by dynamics confined to that basin. The computed sensitivities are convolved with surface atmospheric state variability from ERA-Interim to attribute the influence of each external forcing variable (e.g., wind stress, precipitation) on the SAMOC from 1992 to 2011. Here, local wind stress perturbations are shown to dominate variability on seasonal time scales while buoyancy forcing plays a minor role, confirming results from past forward perturbation experiments. Interannual variability, however, is shown to have originated from remote locations across the globe, including a nontrivial component originating from the tropical Pacific. The influence of atmospheric forcing emphasizes the importance of continuous widespread observations of the global atmospheric state for attributing observed AMOC variability. © 2019, American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117190
Appears in Collections: 气候变化与战略
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Recommended Citation:
Smith T.,Heimbach P.. Atmospheric origins of variability in the south atlantic meridional overturning circulation[J]. Journal of Climate,2019-01-01,32(5)