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Frontiers of Earth Science

Front. Earth Sci.    2015, Vol. 9 Issue (2) : 192-201     DOI: 10.1007/s11707-014-0461-8
Assimilation of HY-2A scatterometer sea surface wind data in a 3DVAR data assimilation system–A case study of Typhoon Bolaven
Yi YU1,*(),Weimin ZHANG1,Zhongyuan WU1,Xiaofeng YANG2,Xiaoqun CAO1,Mengbin ZHU1
1. National University of Defense Technology, Changsha 410073, China
2. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
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The scatterometer (SCAT) on-board China’s HY-2A satellite has the capability to provide high resolution wind vector information over the global ocean surface. These wind vector data produced by the HY-2A scatterometer (HY-2A SCAT) are available to the data assimilation system with real-time information of high accuracy. In this paper, two experiments are designed to investigate the impact of HY-2A SCAT data in the three-dimensional variational assimilation system for the Weather Research and Forecast model (WRF 3DVAR). The powerful Typhoon Bolaven, which struck South Korea in August 2012, is selected for this case study. The results clearly demonstrate that HY-2A SCAT data can effectively complement the scarce observations over the ocean surface and improve the prediction of the wind and pressure fields of a typhoon. The case study of Typhoon Bolaven exhibits the significant and positive impact of HY-2A SCAT data on the numerical prediction of the tropical cyclone track.

Keywords HY-2A      scatterometer      data assimilation      sea surface wind      3DVAR     
Corresponding Authors: Yi YU   
Online First Date: 19 November 2014    Issue Date: 30 April 2015
 Cite this article:   
Yi YU,Xiaofeng YANG,Xiaoqun CAO, et al. Assimilation of HY-2A scatterometer sea surface wind data in a 3DVAR data assimilation system–A case study of Typhoon Bolaven[J]. Front. Earth Sci., 2015, 9(2): 192-201.
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Xiaofeng YANG
Xiaoqun CAO
Mengbin ZHU
Weimin ZHANG
Zhongyuan WU
Fig.1  The locations of NDBC buoys in this study (a) and comparison of the wind speed observed by HY-2A SCAT products with buoy data (b)
Fig.2  The horizontal (grids) distribution for the model domain (a) and the HY-2A SCAT wind observations in the vicinity of Typhoon Bolaven on 25 August 2012 (b)
Fig.3  Analysis of Typhoon Bolaven at 0600 UTC 25 August 2012. (a) First guess of the wind speed and the MSLP (hPa); the arrow above 50 indicates that the wind speed is 50 m/s with this length. (b) Analysis increments of the wind speed and the MSLP, the arrow above 10 indicates that the wind speed is 10 m/s with this length.
Fig.4  The zonal vertical sections of Typhoon Bolaven valid at 0600 UTC 25 2012: temperature anomaly (K) from CTRL (a) and HSCAT (b); wind speed anomaly (m/s) from CTRL (c) and HSCAT (d); geopotential height anomaly (gpm) from CTRL (e) and HSCAT (f)
Fig.5  (a) Tracks of Typhoon Bolaven (2012). The black line represents the best track. The red line represents the HSCAT runs starting at 0600 UTC 25 August 2012. The blue line represents the CTRL runs for the same time. (b) The track errors of Bolaven for 66 hours. The red line represents the CTRL runs, and the black line represents the HSCAT runs.
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