Currents in the Luzon Strait during spring of 2002: observation and computation by modified inverse model

YUAN Yao-chu; LOU Ru-yun; Liu Yong-gang; SU Ji-lan; WANG Kang-shan

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YUAN Yao-chu, LOU Ru-yun, Liu Yong-gang, SU Ji-lan, WANG Kang-shan. Currents in the Luzon Strait during spring of 2002: observation and computation by modified inverse model[J]. Haiyang Xuebao, 2005, 27(3): 1-10.

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Currents in the Luzon Strait during spring of 2002: observation and computation by modified inverse model

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Lab of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;College of Marine Science, University of South Florida, U. S. A

Received Date: 2004-06-08
Rev Recd Date: 2004-11-15

Abstract

Abstract

On the basis of the current measurements at 200,500 and 800 m from moored currentmeters with the time series data from March 17 to April 15 at the mooring station (20°49'57"N,120°48'12"E) and the hydrog raphic data obtained on the both sides of Luzon Strait (LS) in spring of 2002 cruise,the circulation in the investigated area is computed by using the modified inverse method.The major observed results are as follows: (1) the average velocity in the observing days is (47.4 cm/s,346°) at the 200 m levels.The average velocity in the observing days is (20.3 cm/s,350°) at the 500 m levels.These mean that the Kuroshio intrudes in the South China Sea(SCS) to flow northwestward through the Luzon Strait at the 200 and 500 m levels.(2) The average velocity in the observing days is (1.2 cm/s,35°) at the 800 m levels,i.e.,its direction is northeastward.This means that the flow condition at the 800 m levels very differs from that at the 200 and 500 m levels.(3) There is the high density and cold water (HDCW) in the middle of western part of in the investigated region,and its center is located near the hydrological station 3 at Section A.(4) There is the lower density and warm water (LDWW) in the southeastern part of investigated region.The major computed results are as follows: (1) The northwestward and southeastward volume transports (VT) through Section B are 32.48×10⁶ (inclusive of VT of anti-cyclonic eddy) and 3.34×10⁶m³/s,respectively.The net northwestward VT through Section B in the investigated area is about 29.14×10⁶m³/s.(2) The eastern and western VT through Section A is about 16.71 and 8.57×10⁶m³/s,respectively.Thus,the neteastward VT through Section A is about 8.14×10⁶m³/s.(3) The net northward VT through Section M is about 24.68×10⁶m³/s.(4) After about 24.68×10⁶m³/s flows through Section M,most of it,about 16.54×10⁶m³/s,flows northward through the eastern part of Section C and then flows northward into the region east Taiwan Island.A part of it,about 8.14×10⁶m³/s,branch out from the main Kuroshio and then flows meanderingly through the western part of Section C.Thus,the Kuroshio has the two cores of current at Section C.(5) The direction of the computed current near the mooring station Magrees with the direction of the current measurements at 200 and 500 m from moored current meters.(6) About 3.34×10⁶m³/s of the SCS water probably flows slowly from the northwest to the southeast in the layer below 550 m at the western part of Section B.
- currents in the Luzon Strait during spring of 2002,
- currents measurements,
- modified inverse method

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References(23)

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