An operational radar current observing and data service platform in the East China Sea
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An operational radar current observing and data service platform in the East China Sea DENG Zeng’an1, ZHANG Anmin1, ZHAI Jingsheng1, YU Ting2*, WU Shuangquan2, ZHANG Xuefeng2, KANG Linchong2, ZHANG Yuming3 1 School of Marine Science and Technology, Tianjin University, Tianjin 300072, China 2 National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China 3 National Marine Environmental Monitoring Center, State Oceanic Administration, Dalian 116023, China
Received 12 October 2015; accepted 23 June 2016 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2016
Abstract
An ocean state monitor and analysis radar (OSMAR), developed by Wuhan University in China, have been mounted at six stations along the coasts of East China Sea (ECS) to measure velocities (currents, waves and winds) at the sea surface. Radar-observed surface current is taken as an example to illustrate the operational high-frequency (HF) radar observing and data service platform (OP), presenting an operational flow from data observing, transmitting, processing, visualizing, to end-user service. Three layers (systems): radar observing system (ROS), data service system (DSS) and visualization service system (VSS), as well as the data flow within the platform are introduced. Surface velocities observed at stations are synthesized at the radar data receiving and preprocessing center of the ROS, and transmitted to the DSS, in which the data processing and quality control (QC) are conducted. Users are allowed to browse the processed data on the portal of the DSS, and access to those data files. The VSS aims to better show the data products by displaying the information on a visual globe. By utilizing the OP, the surface currents in East China Sea are monitored, and hourly and seasonal variabilities of them are investigated. Key words: radar, operational system, currents, data service, visualization Citation: Deng Zeng’an, Zhang Anmin, Zhai Jingsheng, Yu Ting, Wu Shuangquan, Zhang Xuefeng, Kang Linchong, Zhang Yuming. 2016. An operational radar current observing and data service platform in the East China Sea. Acta Oceanologica Sinica, 35(11): 9–15, doi: 10.1007/s13131-016-0944-4
1 Introduction The traditional ocean surface current observing equipments are mainly in-situ devices such as buoys and current meters. It is difficult or even impractical to use them obtaining the surface current field in a large area. With the common defects of high investment but low efficiency, those devices can only obtain the current data at a single point or along a line/track. Moreover, the observation is severely restricted by weather conditions. The emerging high-frequency (HF) radar is capable of remotely measuring the surface currents over a large sea area in near real time. It is operable at all sea states with relatively small investment. Wuhan University firstly published its study on using small HF radar phased array to detect large-scale ocean surface condition in 1997. At the end of 2000, a broad-beam HF rad
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