2015年黄海浒苔演变特征的遥感分析

Remote sensing of the Yellow Sea green tide evolution in 2015

为揭示2015年黄海区域浒苔演变特征,利用MODIS(moderate-resolution imaging spectrometer)数据,通过计算漂浮藻类指数(floating algae index,FAI)建立了浒苔信息的数据集,进而获取了浒苔的时空变化规律特征。研究发现,5月13日浒苔条带最早出现在苏北近岸,之后浒苔条带向北和向东漂移,浒苔覆盖面积逐渐变大;向北漂移的浒苔逐渐发展成大规模聚集的形态,而向东的条带仍旧是分散的形态;向北漂移的浒苔条带6月12日到达半岛顶端后出现大规模登陆的情况,登陆的依次顺序为乳山—青岛—海阳;在苏北近岸的浒苔一直持续到8月5日。对2015年浒苔时空演变特征与往年情况进行初步对比分析,发现其与2013年浒苔漂移路径和登陆过程存在显著差异,具有很强的年际差异。

A macroalgae detection index based on moderate-resolution imaging spectrometer（MODIS） data is applied to monitor the evolution of a green tide during 2015. The earliest observation of Ulva prolifera patches offshore Subei area was in May 13 th. Strips of Ulva prolifera developed into two branches, northward and eastward, both of which expanded. The northward strip gradually developed into one united massive pattern, while the eastward strip remained scattered. After the northward strip reached the end of Shandong Peninsula, a huge-scale landing process began along the coast of Rushan—Qingdao—Haiyang. The strips persisted offshore Subei area until August 5th. Subsequently, the massive Ulva prolifera bloom was not detected in MODIS images.