珠江口海域赤潮发生前天气环流形势及水文气象要素特征分析

The Analysis of Weather Circulation Situations and Hydrological and Meteorological Characteristics Before the Occurrence of Red Tide in the Pearl River Estuary

气象、水文要素条件是赤潮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：赤潮发生前，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, hydrological condition is an important factor to the red tide eruption. Atmospheric circulation maintenance and variation decide meteorological phenomena, hydrology key element to stabilize or change, moreover, red tide organisms breed from initial stage to blooming reproduction stage, until reaching the biological density of the red tide, generally taking 4-~5 days. In this paper, u- sing a resolution of 2.5 - 2.5 DEG NCEP/NCAR data, surface temperature data of ocean station, sta- tistical analysis of 1980-2001 in the Pearl River Estuary red tide generating a total of 63 cases early weather and hydrological and meteorological elements of statistical analysis Statistic. The results show that： the occurrence of red tides, ocean atmospheric circulation form relatively stable occurrence of red tide, is partly cloudy or sunny, sunny, the daily temperature variations in the surface are less than 1 C, wind-force is less than 4, the wave height is less than 1 m.