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State analysis using the Local Ensemble Transform Kalman Filter (LETKF) and the three-layer circulation structure of the Luzon Strait and the South China Sea

Erratum to: Controls on monthly estuarine residuals: Eulerian circulation and elevation

Deutsche Hydrografische Zeitschrift : Volume 64, Issue 5, May 2014

Deutsche Hydrografische Zeitschrift : Volume 64, Issue 4, April 2014

Deutsche Hydrografische Zeitschrift : Volume 64, Issue 3, March 2014

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State analysis using the Local Ensemble Transform Kalman Filter (LETKF) and the three-layer circulation structure of the Luzon Strait and the South China Sea

Content Provider	Springer Nature Link
Author	Xu, Fang Hua Oey, Lie Yauw
Copyright Year	2014
Abstract	A new circulation model of the western North Pacific Ocean based on the parallelized version of the Princeton Ocean Model and incorporating the Local Ensemble Transform Kalman Filter (LETKF) data assimilation scheme has been developed. The new model assimilates satellite data and is tested for the period January 1 to April 3, 2012 initialized from a 24-year simulation to estimate the ocean state focusing in the South China Sea (SCS). Model results are compared against estimates based on the optimum interpolation (OI) assimilation scheme and are validated against independent Argo float and transport data to assess model skills. LETKF provides improved estimates of the western North Pacific Ocean state including transports through various straits in the SCS. In the Luzon Strait, the model confirms, for the first time, the three-layer transport structure previously deduced in the literature from sparse observations: westward in the upper and lower layers and eastward in the middle layer. This structure is shown to be robust, and the related dynamics are analyzed using the results of a long-term (18 years) unassimilated North Pacific Ocean model. Potential vorticity and mass conservations suggest a basin-wide cyclonic circulation in the upper layer of the SCS (z > −570 m), an anticyclonic circulation in the middle layer (−570 m ≥ z > −2,000 m), and, in the abyssal basin (<−2,000 m), the circulation is cyclonic in the north and anticyclonic in the south. The cyclone–anticyclone abyssal circulation is confirmed and explained using a deep-layer reduced-gravity model as being caused by overflow over the deep sill of the Luzon Strait, coupled with intense, localized upwelling west of the strait.
Starting Page	905
Ending Page	923
Page Count	19
File Format	PDF
ISSN	16167341
Journal	Deutsche Hydrografische Zeitschrift
Volume Number	64
Issue Number	6
e-ISSN	16167228
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-05-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Three-layer circulation of South China Sea Three-layer Luzon Strait transport Local Ensemble Transform Kalman Filter (LETKF) Data assimilation Ocean modeling Oceanography Geophysics/Geodesy Atmospheric Sciences Fluid- and Aerodynamics Environmental Monitoring/Analysis
Content Type	Text
Resource Type	Article
Subject	Oceanography

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