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洋际交换及其在全球大洋环流中的作用:MOM4p1积分1400年的结果

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Keywords: 全球大洋,数值模拟,洋际交换,经向输运,经向翻转环流

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Abstract:

利用非Boussinesq近似下MOM4p1的全球大洋环流预后模式,采用真实地形,以静止状态为初始条件,进行了1400a积分,以研究平衡状态下大洋环流的结构。模式由月平均气候态强迫场驱动,包括192×189个水平网格和压力坐标下的31个垂直层次。着重研究达到平衡状态后,各洋际通道处的质量、热量输运和补偿及其在全球大洋环流中的作用。根据动能演变特征表明,积分过程分为3个阶段:风海流的成长及准稳定状态;热盐环流的成长过程以及热盐环流的稳定状态;由静止状态冷启动达到热盐环流的稳定状态,积分过程必须在千年以上。模式结果再现了从白令海峡到格陵兰海的北冰洋贯穿流和印度尼西亚贯穿流,并用已有观测资料对它们进行对比。分析表明,海面的倾斜结构是形成太平洋-北冰洋-大西洋贯穿流和印尼贯穿流的主要动力机制。分析指出,尽管在北大西洋存在1.4×106m3/s的南向体积输运,但其热量输运却是北向的并达到1015W量级,其原因是北向的上层海流温度远高于北大西洋深层水向南的回流。文章分析了经向体积和热量输运对北大西洋深层水补偿来源及大西洋经向翻转环流的贡献。模拟所得洋际交换的量值可以由经向补偿予以合理解释,并得到以往实测与数模结果的支持。洋际通道处的体积和热量交换突出体现了其在大洋传送带系统中的枢纽作用。

References

[1]  Roemmich D H,Wunsch C. Two transatlanticsections:Meridional circulation and heat flux in thesubtropical North Atlantic Ocean[J]. Deep-Sea Res,1985,32:619-664.
[2]  Talley L D. Data-based meridionaloverturning streamfunctions for the global ocean[J].J Clim,2003,16:3213-3226.
[3]  Broecker W S. The great ocean conveyor[J]. Oceanogr,1991,4:79-89.
[4]  Broecker W S. The biggest chill[J]. Nat Hist Mag,1987,97:74-82.
[5]  Schmitz W J. On the interbasin-scale thermohaline circulation[J]. Rev Geophys,1995,33:151-173.
[6]  Huisman S E,Dijkstra H A,Hegdt A S von der,et al. Robustness of multiple equilibria in the global ocean circulation[J]. Geophys Research Letters,2009,36(1):L01610.
[7]  Marotzke J,Willebrand J. Multiple equilibria of the global thermohaline circulation[J]. J Phys Oceanogr,1991,21:1372-1385.
[8]  Wei Z,Choi B,Fang G. Water,heat and salt transports from diagnostic world ocean and north Pacific circulation models[J].La Mer,2000,38:211-218.
[9]  Dong S,Garzoli S,Baringer M. The role of interocean exchanges on decadal variations of the meridional heat transport in the South Atlantic[J]. J Phys Oceanogr,2011,41:1498-1511.
[10]  Griffies S M. Elements of Mom4p1 //GFDL Ocean Group Technical Report. 2010,6.
[11]  Levitus S,Boyer T. World Ocean Atlas[M]. Washington D C:NOAA,1994:1-117.
[12]  Hellerman S,Rosenstein M. Normal monthly wind stress over the world ocean with error estimates[J]. J Phys Oceanogr,1983,13:1093-1104.
[13]  Overland J E,Roach A T. Northward flow in the Bering and Chukchi Seas[J]. J Geophys Res,1987,92(C7):7097-7106.
[14]  Li L,Du L,Zhao J P,et al. The fundamental characteristics of current in the Bering Strait and the Chukchi Sea from July to September 2003[J]. Acta Oceanologica Sinica,2005,24(6):1-11.
[15]  Woodgate R A,Aagaard K,Weingartner T. A year in the physical oceanography of the Chukchi Sea:Moored measurements from autumn 1990-1991. Part Ⅱ:Topical Studies in Oceanography[J]. Deep-Sea Research,2005,52:3116-3149.
[16]  Gordon A L. Interocean exchange of thermocline water[J].J Geophys Res,1986,91:5037-5046.
[17]  Hall M M,Bryden H L. Direct estimates and mechanismsof ocean heat transport[J]. Deep-Sea Res,1982,29(3A):339-359.
[18]  Ganachaud A,Wunsch C. Large-scale ocean heat and freshwater transports during the world ocean circulation experiment[J].J Climate,2002,16:696-705.
[19]  Ganachaud A,Wunsch C. Improved estimates of global ocean circulation,heat transport and mixing from hydrographic data[J]. Nature,2000,408,453-457.
[20]  Trenberth K E,Caron J M,Stepaniak D P. The atmospheric energy budget and implications for surface fluxes and ocean heat transports[J]. Climate Dynamics,2001,17:259-276.

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