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气象、水文要素条件是赤湖爆发的重要启动因子,而天气环流的维持与变化决定了气象、水文要素的维持与变化,赤潮生物从初期繁殖到后期的爆发性繁殖,直至达到赤潮生物密度,这一过程一般需要4~5d的时间。本文利用分辨率为2.5(°)×2.5(°)的NCEP/NCAR再分析资料、海洋站实测表层水温资料,对1980~2001年珠江口海域共63次赤潮个例生成前期的天气环流形势和水文气象要素进行统计分析,结果表明:赤湖发生前,赤潮发生海域上空大气环流形式相对稳定,多为少云或晴天,光照充足,表层水温日变化均小于1℃,风力小于4级,浪高小于1m。分析结果为赤潮预报提供有意义的参考。
Meteorological and hydrological conditions are the important initiating factors for the outbreak of red lakes. However, the maintenance and change of meteorological and hydrological elements are the main factors that cause the outbreak of red lakes. The maintenance and change of meteorological and hydrological elements and the blooming of red tide organisms from initial breeding to late blooming, This process generally takes 4 ~ 5d time. In this paper, the NCEP / NCAR reanalysis data with a resolution of 2.5 (°) × 2.5 (°) and the surface water temperature data measured by the Ocean Station were used to study the weather circulation and the weather circulation in the Pearl River estuary from the 1980 to 2001 The results showed that before the occurrence of red lakes, the atmospheric circulation pattern over the sea area where red tide occurred was relatively stable, mostly cloudy or sunny, with sufficient sunlight, surface water temperature less than 1 ℃, wind less than 4, Height less than 1m. The results provide a useful reference for the forecast of red tide.