DOI: 10.1175/JCLI-D-12-00131.1
Scopus记录号: 2-s2.0-84893967472
论文题名: The coherence and impact of meridional heat transport anomalies in the atlantic ocean inferred from observations
作者: Kelly K.A. ; Thompson L. ; Lyman J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 4 起始页码: 1469
结束页码: 1487
语种: 英语
英文摘要: Observations of thermosteric sea level (TSL) from hydrographic data, equivalent water thickness (EWT) from the Gravity Recovery and Climate Experiment (GRACE), and altimetric sea surface height (SSH) are used to infer meridional heat transport (MHT) anomalies for the Atlantic Ocean. An "unknown control" version of a Kalman filter in each of eight regions extracts smooth estimates of heat transport convergence (HTC) from discrepancies between the response to monthly surface heat and freshwater fluxes and observed mass and heat content. Two models are used: modelA using only the heat budget for 1993-2010 and model B using both heat and mass budgets for 2003-10. Based on the small contributions of mass to SSH, model A is rerun using SSH in place of TSL to improve temporal resolution and data consistency. Estimates of MHT are derived by summing the HTC from north to south assuming either negligible anomalies at 67° N or setting MHTto observed values near 40° N. Both methods show thatMHTis highly coherent between 35° S and 40° N. The former method gives a large drop in coherence north of 40° Nwhile the latter method gives a less dramatic drop. Estimated anomalies in MHT comparable to or larger than that recently observed at the Rapid Climate Change and Meridional Overturning Circulation and Heatflux Array (RAPID/MOCHA) line at 26.5° N have occurred multiple times in this 18-yr period. Positive anomalies in coherent MHT correspond to increased heat loss in the North Atlantic subtropical gyre demonstrating the feedback of oceanic heat transport anomalies on air-sea fluxes. A correlation of MHT with the Antarctic Oscillation suggests a southern source for the coherent MHT anomalies. © 2014 American Meteorological Society.
资助项目: NASA, National Aeronautics and Space Administration
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50953
Appears in Collections: 气候变化事实与影响
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作者单位: Applied Physics Laboratory, University of Washington, Seattle, WA, United States; School of Oceanography, University of Washington, Seattle, WA, United States; NOAA/Pacific Marine Environmental Laboratory, Seattle, WA, United States; Joint Institute for Marine and Atmospheric Research, University of Hawai'i at Manoa, Honolulu, HI, United States
Recommended Citation:
Kelly K.A.,Thompson L.,Lyman J.. The coherence and impact of meridional heat transport anomalies in the atlantic ocean inferred from observations[J]. Journal of Climate,2014-01-01,27(4)