A preliminary assessment of the sea surface wind speed production of HY-2 scanning microwave radiometer
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A preliminary assessment of the sea surface wind speed production of HY-2 scanning microwave radiometer HUANG Xiaoqi1 , ZHU Jianhua1∗ , LIN Mingsen2 , ZHAO Yili1 , WANG He1 , CHEN Chuntao1 , PENG Hailong2 , ZHANG Youguang2 1 2
National Ocean Technology Center, State Oceanic Administration, Tianjin 300111, China National Satellite Ocean Application Service, State Oceanic Administration, Beijing 10081, China
Received 31 August 2012; accepted 8 January 2013 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2014
Abstract A scanning microwave radiometer (RM) was launched on August 16, 2011, on board HY-2 satellite. The six-month long global sea surface wind speeds observed by the HY-2 scanning microwave radiometer are preliminarily validated using in-situ measurements and WindSat observations, respectively, from January to June 2012. The wind speed root-mean-square (RMS) difference of the comparisons with in-situ data is 1.89 m/s for the measurements of NDBC and 1.72 m/s for the recent four-month data measured by PY30-1 oil platform, respectively. On a global scale, the wind speeds of HY-2 RM are compared with the sea surface wind speeds derived from WindSat, the RMS difference of 1.85 m/s for HY-2 RM collocated observations data set is calculated in the same period as above. With analyzing the global map of a mean difference between HY-2 RM and WindSat, it appears that the bias of the sea surface wind speed is obviously higher in the inshore regions. In the open sea, there is a relatively higher positive bias in the mid-latitude regions due to the overestimation of wind speed observations, while the wind speeds are underestimated in the Southern Ocean by HY-2 RM relative to WindSat observations. Key words: HY-2 satellite, scanning microwave radiometer, sea surface wind speed, spatial and temporal collocation, validation Citation: Huang Xiaoqi, Zhu Jianhua, Lin Mingsen, Zhao Yili, Wang He, Chen Chuntao, Peng Hailong, Zhang Youguang. 2014. A preliminary assessment of the sea surface wind speed production of the HY-2 scanning microwave radiometer. Acta Oceanologica Sinica, 33(1): 114–119, doi: 10.1007/s13131-014-0403-z
1 Introduction The HY-2 satellite was launched on August 16, 2011. As one of the series of HY satellites, HY-2 satellite is able to observe dynamic ocean environment parameters on a global scale for the first time in China. There are multiple sensors, i.e., radar altimeter, microwave scatterometer, three-frequency microwave radiometer, besides the scanning microwave radiometer aboard HY-2 satellite. As one of important instruments aboard HY2 satellite, a key feature of the scanning microwave radiometer (RM) aboard HY-2 is capable of providing all-weather observations of ocean parameters, including sea surface temperature (SST), sea surface wind (SSW), total water vapor (WV) and cloud liquid water (CLW). So far, there are several space-borne microwave radiometer launched by the NASA and the ESA in orbit, such as SSM/I F16 aboard the Defense Meteorological Satellite Program (DMSP),
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