DOI: 10.1175/JCLI-D-15-0242.1
Scopus记录号: 2-s2.0-84950135765
论文题名: Response of the equatorial pacific seasonal cycle to orbital forcing
作者: Erb M.P. ; Broccoli A.J. ; Graham N.T. ; Clement A.C. ; Wittenberg A.T. ; Vecchi G.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 23 起始页码: 9258
结束页码: 9276
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric radiation
; Climate models
; Incident solar radiation
; Solar radiation
; Stream flow
; Thermodynamics
; General circulation model
; Geographic location
; Heat budgets/fluxes
; Pacific ocean
; Paleoclimates
; Radiative forcings
; Seasonal cycle
; Variability
; Oceanography
; air-sea interaction
; climate modeling
; climatology
; general circulation model
; heat budget
; heat flux
; orbital forcing
; paleoclimate
; precession
; radiative forcing
; sea surface temperature
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: The response of the equatorial Pacific Ocean's seasonal cycle to orbital forcing is explored using idealized simulations with a coupled atmosphere-ocean GCM in which eccentricity, obliquity, and the longitude of perihelion are altered while other boundary conditions are maintained at preindustrial levels. The importance of ocean dynamics in the climate response is investigated using additional simulations with a slab ocean version of the model. Precession is found to substantially influence the equatorial Pacific seasonal cycle through both thermodynamic and dynamic mechanisms, while changes in obliquity have only a small effect. In the precession experiments, western equatorial Pacific SSTs respond in a direct thermodynamic manner to changes in insolation, while the eastern equatorial Pacific is first affected by the propagation of thermocline temperature anomalies from the west. These thermocline signals result from zonal wind anomalies associated with changes in the strength of subtropical anticyclones and shifts in the regions of convection in the western equatorial Pacific. The redistribution of heat from these thermocline signals, aided by the direct thermodynamic effect of insolation anomalies, results in large changes to the strength and timing of the eastern equatorial Pacific seasonal cycle. A comparison of 10 CMIP5 mid-Holocene experiments, in which the primary forcing is due to precession, shows that this response is relatively robust across models. Because equatorial Pacific SST anomalies have local climate impacts as well as nonlocal impacts through teleconnections, these results may be important to understanding paleoclimate variations both inside and outside of the tropical Pacific. © 2015 American Meteorological Society. 资助项目: NOAA, National Oceanic and Atmospheric Administration
; NSF, 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/50851
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Institute for Geophysics, University of Texas at Austin, Austin, TX, United States; Institute for Earth, Ocean and Atmospheric Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, NJ, United States
Recommended Citation:
Erb M.P.,Broccoli A.J.,Graham N.T.,et al. Response of the equatorial pacific seasonal cycle to orbital forcing[J]. Journal of Climate,2015-01-01,28(23)