Circulation Characteristics and Forecasting Indicators of High Wind in a Port of South China Sea: Taking Yangpu Port as an Example
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Abstract:
Taking Yangpu Port of Hainan as an example, using wind data from 2015 to 2019, the circulation characteristics, inducing mechanism and forecasting indicators of different kinds of High Wind Processes (HWPs) are investigated in this paper. Results suggest that: (1) HWPs of Yangpu Port can be divided into four types, namely coldair type, shearline type, tropicalcyclone (TC) type and thermallow type, according to their influencing systems. (2) The coldair HWP is mainly due to the advection of cold air. When the decreasing of the temperature in the critical area at 925 hPa is greater than 6 ℃ and the magnitude of north wind is greater than 11.5 m/s, it indicates that the coldair HWP will occur in 6 hours; the shearlinear HWP is mainly caused by thunderstorm gales and squall lines induced by severe convection; when favorable configuration appears in synopticscale systems such as 925 hPa low shearline and 500 hPa south trough, CAPE≥1500 J·kg-1 with appropriate CIN value, the shearlinear HWP is prone to occur; the thermallow HWP is closely related to the sea breeze front caused by the difference of sealand heat; when the difference of the increasing temperature between northwest inland and offshore sea surface in 6 hours is greater than or equal to 3.5 ℃, CAPE≥1500 J·kg-1, CIN≤20 J·kg-1, the sea breeze front is prone to trigger severe convection such as thunderstorms and gales; the TC HWP mainly occurs in the isobaric dense belt near the TC center and the mesoscale convective systems in the peripheral spiral rain belt. The wind scale can be determined synthetically based on the numerical forecast and combined with the statistical law, satellite, radar, and other monitoring data in the operational forecast.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.