普里兹湾附近绕极深层水和底层水及其运动特征
Features of Circumpolar Deep Water, Antarctic Bottom Water and their movement near the Prydz Bay
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摘要: 利用中国第15次南极科学考察科学考察队的CTD全深度观测资料(1998年11月至1999年2月),分析并讨论了普里兹湾以北的南大洋海域内,绕极深层水(CDW)和南极底层水(AABW)的物理特性及其空间分布.同时还与历史上其他学者的发现进行了比较.指出了在研究海域内,CDW在100～2000m之间从北向南扩展,其高温核(t>1.2℃)和高盐核(S>34.7)在75°E断面上最为深厚,向南扩展得最远;而AABW则在2500m以深由陆坡底部向北扩展,σθ>27.875的高密度水体在70°E断面上最为深厚,向北扩展得最远.此外还通过实测的CTD资料证实了CDW和AABW的经向环流特征,以及它们与迪肯流环(Deaconcell)、亚极地流环和深层流环的一致性.Abstract: Historical CTD data of the full-depth measurements which were conducted during the 15th Antarctic Survey of China in the period from November 1998 to February 1999 are used to analyze and discuss the marine physical characteristics of the Circumpolar Deep Water (CDW) and the Antarctic Bottom Water (AABW),and their spacial distribution in the Southern Ocean to the north of the Prydz Bay.The results are compared with the discovery by other oceano graphers in the historical liter ature.It is pointed out that CDW extends southward in the depths from 100×104 Pa to 2 000×104 Pa in the studied area.Both the high temperature core (t>1.2℃) and the high salinity core (S>34.7) of CDW become the thickest and extend the furthest southward in the 75°E section among all the 3 sections.AABW extends northward from the continental shelf in the depthsbelow 2 500×104 Pa.The high-density water (σθ>27.875) becomes the thickest and extends the furthest northward in the 70°E section.In addition,the CTD data from the measurements are used to provide the scientific evidence for the longitudinal circulation pattern in CDW and AABW,which is coincident with the features of deacan cell,sub-polar cell and deep cell in the Southern Ocean.
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Key words:
- Circumpolar Deep Water /
- Antarctic Bottom Water /
- Prydz Bay
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DEACON G E R.The hydrography of the Southern Ocean.Discovery Rep[R].1937.124. GORDEN A L.Oceanography of Antarctic waters[A].REID J L.Antarctic Oceanography,Ant Res Ser,15[C] 1971.169-203. GORDEN A L.An Antarctic oceanographic section along 170°E [J].Deep-Sea Res,1975,22:357-377. JACOBS S S,GEORGI D T.Observations on the southwest Indian/Antarctic Ocean[A].ANGEL M.A Voyage of Discovery [M].Oxford:Pergamon Press,1997.43-84. ALBERTS F G.Geographic Names of the Antarctic.2nd ed.[M].United States Board on Geographic Names,1995.593. CARMARK E C.Water characteristics of the Southern Ocean south of the Polar Front [J].Deep-Sea Res,1977,A Voyage of Discovery,George Deacon 70th Anniversary Volume,Supplement,15-61. CLARKEAJ.The dyramics of large-scale wind-driven variations in theAACC[J].J Phys Oceanogr,1982 12:1092-1 105. PARK Y-H,GAMBERONI L.Large-scale circulation and its variability in the south Indian Ocean from TOPEX/POSEIDON altimetry [J].Geophys Res,1995,100(C12):24 911-24 929. The FRAM Group.An eddy-resolving model of the Southern Ocean[J].Eos Trans,AGU,1991,72(15):169,174-175. DOOS K,WEBB D J.The deacon cell and other meridional cells of the Southern Ocean [J].J Phys Oceanogr,1994,24(2):429-442. -
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