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Objective Identification of Trough Lines Using Gridded Wind Field Data

Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China
Author to whom correspondence should be addressed.
Atmosphere 2017, 8(7), 121;
Received: 23 May 2017 / Revised: 3 July 2017 / Accepted: 4 July 2017 / Published: 7 July 2017
(This article belongs to the Section Climatology and Meteorology)
PDF [8159 KB, uploaded 7 July 2017]


An objective method was developed to analyze longwave and shortwave trough lines in wind field data using different methods, given that these trough lines were researched in different ways. Longwave trough lines were analyzed by locating the cyclonic center and filtering candidate trough points simultaneously; the candidate longwave trough points were then traced based on distance and angle conditions. Next, candidate shortwave trough points were determined based on angular deflection and vorticity data, which were clustered and fitted to a curve for extraction. This method was applied to wind field data from the National Center for Environmental Prediction (NCEP) to analyze trough lines in East Asia and South Asia. The experimental results show that our method can effectively identify trough lines by comparing them with manual analysis results. The statistical results indicate that the method more precisely identifies longwave trough lines than shortwave trough lines, and that trough lines during the fall and winter are more accurately and effectively identified than those during the spring and summer. View Full-Text
Keywords: trough line identification; objective analysis; wind field grid data trough line identification; objective analysis; wind field grid data

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Huang, Y.; Li, Q.; Fan, Y.; Dai, X. Objective Identification of Trough Lines Using Gridded Wind Field Data. Atmosphere 2017, 8, 121.

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