热带外太平洋通过海洋过程对热带太平洋的影响
Influence of the extratropical Pacific on the tropical Pacific through oceanic processes
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摘要: 利用MOM2海洋环流模式分别研究了年际和年代际尺度上热带外太平洋通过海洋过程对热带太平洋的影响.利用1945~1993年COADS资料的表面通量强迫海洋模式,积分46 a作为模式控制试验.取热带外太平洋海表面强迫为气候值做敏感性试验.将控制试验结果减去敏感性结果就可以得到热带外太平洋通过海洋过程对热带太平洋的影响.结果表明,年际尺度上,主要是海洋波动过程起作用,但总的海洋过程的影响较小.年代际尺度上,主要是副热带环流输送起作用,其中包括平均环流输送的温度异常以及异常环流输送的平均温度,并且后者贡献相对较大.年际和年代际尺度上,热带太平洋的温度异常主要发生在密度跃层附近.研究发现热带外南太平洋对热带和热带外太平洋之间的水量交换有影响,而热带外北太平洋的影响较弱.Abstract: The influence of the extratropical Pacific on the tropical Pacific through the oceanic processes on the interannual and interdecadal time scales was studied with an oceanic general circulation model,the Modular Ocean Model version 2 of Geophysical Fluid Dynamics Laboratory.The model was run for 46 a (1945~1993)with the surface conditions taken from COADS,as a control run.Aparallel sensitivity experiment was run with the same surface conditions everywhere as the control run except over the extratropical Pacific where the surface condition was prescribed with clima ology.Difference between the control run and the sensitivity run indicates the influence of the extratropical Pacific on the tropical Pacific through the oceanic processes.On the interannual time scale,the process of wave propagation is important,but its influence is weak.On the interdecadal time scale,dominant process is associated with the thermal transportation of subtropical cell in which the transportation due to anomalous cell is more important than the climatological cell.The oceanic temperature anomaly is mainly located in pycnocline both on the interannual and interdecadal time scales.The surface forcing of the extratropical South Pacific has impact on water mass exchange between the extratropical and tropical Pacific,while such an impact is weak in the extratropical North Pacific.
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Key words:
- subduction, /
- subtropical cell /
- subtropical gyre /
- pycnocline
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KLEEMAN R,POWER S.Modulation of ENSO on decadal and longer time-scales[A].El Niño and the Southern Oscillation,Multi-scale Variability and Its Impact on Natural Ecosystems and Society[C].Cambridge,1999.413-442. MCCREARY J P,LU Peng.On the interaction between the subtropical and the equatorial oceans:the subtropical cell[J].J Phys Oceanogr,1994,24:466-497. LU Peng,MCCREARY J P.Influence of the ITCZ on the flow of thermocline water from the subtropical to the equatorial Pacific Ocean[J].J Phys Oceanogr,1995,25:3 076-3 088. LIU Zheng-yu,PHILANDER S G H.How different wind stress patterns affect the tropical-subtropical circulations of the upper ocean[J].J Phys Oceanogr,1995,25(4):449-462. GU Dai-fang,PHILANDER S G H.Interdecadal climate fluctuations that depend on exchanges between the tropics and extratropics[J].Science,1997,275:805 807. DESER C,ALEXANDER M A,TIMLIN M S.Upper-ocean thermal variations in the North Pacific during 1970-1991[J].J Climate,1996,9:1 840-1 855. LUYTEN J R,PEDLOSKY J,STOMMEL H.The ventilated thermocline[J].J Phys Oceanogr,1983,13:292-309. 王东晓,刘征宇.太平洋年代际海洋变率的信号通道[J].科学通报,2000,45(8):808-815. GODFREY J S.On ocean spindown:I.a linear experiment[J].J Phys Oceanogr,1975,5:399-409. HUANG Rui-xin,PEDLOSKY J.Climate variability inferred from a layered model of the ventilated thermocline[J].J Phys Oceanogr,1999,29(4):779-790. LIU Zheng-yu,SHIN S I.On thermocline ventilation of active and passive tracers[J].Geophys Res Lett,1999,26:357-360. LYSNE J,CHANG Ping,GIESE B.Impact of the extratropical Pacific on equatorial variability[J].Geophysi Res Lett,1997,24:2 589-2 592. PACANOWSKI R C.MOM2 Documentation.GFDL Ocean Technical Report 3.2[R].329. DA SILVA A M,YOUNG C C.Levitus,Atlas of Surface Marine Data 1994[M].NOAA Atlas NESDIS 6-8,U.S.Department of Commerce,NOAA,NESDIS,1994.912. HANEY R L.Surface thermal boundary condition for ocean circulation models[J].J Phys Oceanogr,1971,1:241-248. DEACONEL,WEBBEK.Interchange of properties between sea and air[A].The Sea:Ideas and Observations:Vol.1[M].New York:Wiley (interscience),1962.49-87. 容新尧,杨修群.全球海洋环流模式中上层海洋对表面强迫的响应和调整:Ⅰ.年际变率[J].海洋学报,2004,26 (2):20-36. RAYNER N A,HORTON E B,PARKER D E,et al.Version 2.2 of the global sea-ice and sea surface temperature data set,1903-1994[J].Clim Res Tech Note,1996,74:1-21. ZHU Yi-min,YANG Xiu-qun.Joint propagating patterns of SST and SLP anomalies in the north Pacific on bidecadal and pentadecadal timescales[J].Advances in Atmospheric Sciences,2003,20:694-710. NONKA M,XIE Shang-ping,MCCREARY J P.Decadal variations in the subtropical cells and equatorial Pacific SST[J].Geophys Res Lett,2002,29:2001GL013676. LEE T,FUKUMORI I.Interannual-to-decadal variations of tropical-subtropical exchange in the Pacific Ocean:boundary versus interior pycnocline transports[J].J Clim,2003,16:4 022-4 042. MALANOTTE-RIZZOLI P,YOUNG R E,HEDSTROM K,et al.Water mass pathways between the subtropical and tropical ocean in a climatological simulation of the North Atlantic ocean circulation[J].Dyn Atmos Oceans,2000,32:331-372. JOCHUM M,MALANOTTE-RIZZOLI P.On the influence of the meridonial overturning circulation on the tropical-subtropical pathways[J].J Phys Oceanogr,2001,31:1 313-1 323. STERL A,HAZELEGER W.Coupled variability and air-sea interaction in the South Atlantic ocean[J].Clim Dyn,2003,21:559-571.
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