DOI: 10.5194/cp-9-547-2013
Scopus记录号: 2-s2.0-84874682583
论文题名: Variability of the ocean heat content during the last millennium - An assessment with the ECHO-g Model
作者: Ortega P. ; Montoya M. ; González-Rouco F. ; Beltrami H. ; Swingedouw D.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 2 起始页码: 547
结束页码: 565
语种: 英语
Scopus关键词: air-sea interaction
; assessment method
; Atlantic Multidecadal Oscillation
; climate variation
; general circulation model
; global warming
; greenhouse gas
; heat balance
; heat flux
; North Atlantic Oscillation
; numerical model
; Pacific Decadal Oscillation
; radiative forcing
; sea surface temperature
; shortwave radiation
; temperature effect
; timescale
; volcanism
; Atlantic Ocean
; Middle Atlantic Bight
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Studies addressing climate variability during the last millennium generally focus on variables with a direct influence on climate variability, like the fast thermal response to varying radiative forcing, or the large-scale changes in atmospheric dynamics (e.g. North Atlantic Oscillation). The ocean responds to these variations by slowly integrating in depth the upper heat flux changes, thus producing a delayed influence on ocean heat content (OHC) that can later impact low frequency SST (sea surface temperature) variability through reemergence processes. In this study, both the externally and internally driven variations of the OHC during the last millennium are investigated using a set of fully coupled simulations with the ECHO-G (coupled climate model ECHAMA4 and ocean model HOPE-G) atmosphere-ocean general circulation model (AOGCM). When compared to observations for the last 55 yr, the model tends to overestimate the global trends and underestimate the decadal OHC variability. Extending the analysis back to the last one thousand years, the main impact of the radiative forcing is an OHC increase at high latitudes, explained to some extent by a reduction in cloud cover and the subsequent increase of short-wave radiation at the surface. This OHC response is dominated by the effect of volcanism in the preindustrial era, and by the fast increase of GHGs during the last 150 yr. Likewise, salient impacts from internal climate variability are observed at regional scales. For instance, upper temperature in the equatorial Pacific is controlled by ENSO (El Niño Southern Oscillation) variability from interannual to multidecadal timescales. Also, both the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO) modulate intermittently the interdecadal OHC variability in the North Pacific and Mid Atlantic, respectively. The NAO, through its influence on North Atlantic surface heat fluxes and convection, also plays an important role on the OHC at multiple timescales, leading first to a cooling in the Labrador and Irminger seas, and later on to a North Atlantic warming, associated with a delayed impact on the AMO.© Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49468
Appears in Collections: 气候变化与战略
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Recommended Citation:
Ortega P.,Montoya M.,González-Rouco F.,et al. Variability of the ocean heat content during the last millennium - An assessment with the ECHO-g Model[J]. Climate of the Past,2013-01-01,9(2)