适宜平潭海域夜光藻赤潮发生的水温和气象条件统计分析

Statistical analysis of water temperature and meteorological conditions favorable for the occurrence of Noctiluca scintillans red tide in Pingtan sea area

以2002—2019年平潭海域发生的16次夜光藻赤潮作为研究对象,基于平潭海域的水温资料和平潭气象站的气象观测资料,分析了该区域夜光藻赤潮的发生与海表水温和气象条件之间的关系。结果表明:(1)平潭海域夜光藻赤潮常发生于4月中旬—5月;(2)夜光藻赤潮发生的较适宜水温为14.4~24.7℃,最适宜水温为20.7~22.8℃;(3)更温暖的水温和气温背景更有利于赤潮的发生,而且在赤潮发生的前1 d,气温靠近最适宜赤潮发生的水温;(4)与其他赤潮发生类似,平潭海域夜光藻赤潮倾向于发生在弱风速时段;(5)相对湿度高、日照时数少的阴天更有利夜光藻繁殖。

Based on the sea temperature data in the Pingtan sea area and the meteorological data observed by Pingtan Meteorological Station,this paper studies 16 NsRt events occurred in Pingtan sea area from 2002 to 2019 and analyzes their relationship with the sea surface temperature(SST)and meteorological condition.The results show that NsRt usually occurs between mid-April and May when the SST is from 14.4 to 24.7℃with the most suitable SST between 20.7~22.8℃.The warm sea water temperature and air temperature is favorable for the occurrence of NsRt,and the air temperature is close to the most suitable SST one day ahead of the occurrence.Similar to the occurrence of other red tides,NsRt in Pingtan sea area tends to occur when the wind speed is slow.Moreover,cloudy days with high relative humidity and fewer sunshine hours favors the reproduction of Noctiluca scintillans.