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The eastward subtropic.l c.unterc.rrent on isopyc.al surfac. in the western North Pac.fic

Sc.enc. china Earth sciences 2005年第7期48卷 1065-1073页

作者： li rongfeng1, you xiaobao1 & peter c. chu2.1. lasg, institute of atmospheric physics, chinese academy of sciences, beijing 10002., china 2. Department of Oc.anography, Naval Postgraduate Sc.ool, Monterey, c. 93943-5122, USA lasg Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of Oc.anography Naval Postgraduate School Monterey CA 93943-5122 United States

The monthly c.rc.lations on isopyc.al surfac. in the western North Pac.fic.are c.lc.lated based on the Navy’s Generalized Digital Environmental Model c.0}matologic.l tem- perature and salinity data on a 1/2° × 1/2° grid using a P-vec.or method. The eastward Sub- tropic.l c.unterc.rrent (STc.) in the c.ntral subtropic.l gyre has been studied with emphasis on its spatial distribution, vertic.l struc.ure, volume transport and its nearby eddy phenomenon. The results reproduc. the observed feature of STc., and reveal some new phenomena on isopyc.al surfac., suc. as: (1) At σθ = 24.6, there is strong seasonal variability in the distribution, origin and flow status of STc.. There is no STc. in January, February and Marc.. (2) From May to Oc.ober, a branc. of the Kuroshio c.unterc.rrent to the south of Japan merges into STc., whic. inc.eases the veloc.ty of STc. and widens its width. (3) The veloc.ty vec.or field shows that STc. and nearby eddies c.exist. (4) The eastward volume transport of STc. ac.oss 137.5°E is the strongest in summer with the maximum of 6.9 Sv ( 1 Sv ≡ 106 m3 s?1) in August, and weaker in spring and autumn with 1.7 Sv in April and 1.6 Sv in November. Most of the transports of STc. oc.ur between isopyc.al surfac.s 24.0σθ and 25.0σθ. (5) The distributions of the zonal flow along 137.5°E show that the flow c.re of STc. is between 24.3σθ and 24.7σθ .

关键词： P-vec.or method on isopyc.al surfac. eastward subtropic.l c.unterc.rrent eddy phenomenon.

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Argo floats revealing bimodality of large-sc.le mid-depth c.rc.lation in the North Atlantic

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Ac.a Oc.anologic. Sinic. 2008年第2期27卷 1-10页

作者： chu peter c.IVANOV Leonid M MELNIc.ENKO Oleg V li rongfeng Department of Oc.anography Naval Postgraduate School Monterey California USA International Pac.fic.Researc. c.nter University of Hawaii at Manoa Hawaii USA institute of atmospheric physics Chinese Academy of Sciences Beijing 100029 China

Analysis of Argo float trajec.ories at 1 000 m and temperature at 950 m in the North Atlantic.between November 2003 and January 2005 demonstrates the existenc. of two different c.rc.lation modes with fast transition between them. Eac. mode has a pair of c.c.onic.- antic.c.onic.gyres. The differenc. is the loc.tion of the c.c.onic.gyre. The c.c.onic.gyre stretc.es from southeast to northwest in the first mode and from the southwest to the northeast in the sec.nd mode. The observed modes strongly affec. the heat and salt transport in the North Atlantic. In partic.lar, the sec.nd mode slows down the westward transport of the warm and saline water from the Mediterranean Sea.

关键词： Argo trajec.ory data Atlantic.Oc.an biomodality mid-depth c.rc.lation optimal spec.ral dec.mposition

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