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赤潮已经成为我国东海最普遍的海洋灾害之一.利用卫星手段监测赤潮也由来已久.采用Geostationary Ocean Color Imager(GOCI)静止卫星对东海近几年的赤潮进行了监测和分析.研究表明:1)利用Quick Atmospheric Correction(QUAC)获取GOCI的归一化离水辐射率,其中nLw(555nm)作为赤潮事件的特征波段来监测赤潮是有效的;2)以nLw(555nm)为峰值且通过小于1.5mW·cm~(-2)·sr~(-1)·μm~(-1)这一阀值信息来监测中国东海3次不同时间和区域的赤潮事件.3次事件分别为2011年5月东海原甲藻事件、2011年7月中肋骨条藻事件和2014年5月东海原甲藻事件;3)赤潮面积的日变化主要受有效光合辐射和潮位的影响.通过QUAC获取归一化离水辐射率GOCI-nLw(550nm),将nLw(555nm)作为特征波段来获取赤潮信息,并结合光照强度、潮位、温度等参数,分析了赤潮面积日变化的可能原因.
Red tides have become one of the most common marine disasters in the East China Sea. Satellite monitoring of red tides has also been taking place for a long time. The monitoring and analysis of red tides over the East China Sea in recent years has been conducted using Geostationary Ocean Color Imager (GOCI) geostationary satellites. ) The normalized aquatic emissivity of GOCI was obtained using Quick Atmospheric Correction (QUAC), where nLw (555 nm) was effective as a characteristic band for the red tide event to monitor red tide; 2) nLw (555 nm) peaked and passed less than 1.5 mW · cm -2 · sr -1 · μm -1 was used to monitor the red tide event in the East China Sea at three different times and regions.The three events were respectively May 2011 Prorocentrum donghaiense, Striped algae in July 2011 and Prorocentrum donghaiense in May 2014. 3) The diurnal variation of red tide area was mainly affected by photosynthetic radiation and tidal level. The normalized ionization rate The water emissivity GOCI-nLw (550nm) and the nLw (555nm) as the characteristic bands were used to obtain the red tide information. The possible reasons for the diurnal variation of red tide area were analyzed with the parameters of light intensity, tide level and temperature.