依据2012年1月至2013年12月2年的GOCI（Geostationary Ocean Color Imager）卫星总悬浮体数据,分析了长江口毗邻水域的表层悬浮体锋面（浓度≥2mg/L）的周、月变化特征,并对其机制进行了初步分析。研究结果显示,长江口毗邻水域表层悬浮...依据2012年1月至2013年12月2年的GOCI（Geostationary Ocean Color Imager）卫星总悬浮体数据,分析了长江口毗邻水域的表层悬浮体锋面（浓度≥2mg/L）的周、月变化特征,并对其机制进行了初步分析。研究结果显示,长江口毗邻水域表层悬浮体锋面变化可基本分为4个阶段,即：1~3月的外输稳定阶段、4~5月的向岸退缩阶段、6~8月的内储稳定阶段、9~12月的向海扩张阶段。4月由输变退,9月由退变输,1月向外海扩散面积最为广阔,6月向岸退缩得最近。春夏交替时期悬浮体锋面的退缩速度较秋冬交替时的扩张速度快约1倍。一年中,退缩最快的时段约在第15~17周,扩张最快的时段约为第38~39周。结果还表明悬浮体锋面的变化速度与风速的变化速度有很大的相关性。展开更多
Since 2000, red tides have been reported in the Bohai Sea every year, whichoften made coastal waters of the Bohai Sea suffering from red tides. Satellite remotesensing technology and the ocean color observation satell...Since 2000, red tides have been reported in the Bohai Sea every year, whichoften made coastal waters of the Bohai Sea suffering from red tides. Satellite remotesensing technology and the ocean color observation satellite images have beensuccessfully used to identify and observe the initiation, evolution, and dissipation of redtide. However, due to different water bodies, remote sensing data and modelingmethods, a specific model of red tide inversion should be established for the watercharacteristics of the Bohai Sea. In this paper, the correlation analysis between MODISspectral reflectivity data and measured concentration of chlorophyll a in the Bohai Seawas carried out. The expression （B10-B8） / （B13-B8） was chosen as the indicator of redtide inversion in the Bohai Sea, the correlation coefficient reached 0.7815, showingsignificant correlation results. It was found that the spatial and temporal distribution ofred tide in the Bohai Sea in 2014 was obvious. The main causes of the large-scale outbreak of red tide in the Bohai Sea are due to the poor water exchange caused by thesemi-enclosed geomorphology and the large amount of terrestrial matter input fromcoastal runoff. The river input is the main source of land-based pollution into the sea.Then, a red tide inversion model based on a modified red tide index was established byusing GOCI remote sensing data with less cloud coverage, and proven effective indelineating the red tide in turbid waters. The hourly RI images on 15, 26 and 28 May2014 showed consistent evolution, and the area of red tide in the Bohai Sea changedsignificantly during one day. Vertical migration of the dominant species of red tide algaemay be the main reason for the short-term changes in the surface expression.展开更多
文摘依据2012年1月至2013年12月2年的GOCI（Geostationary Ocean Color Imager）卫星总悬浮体数据,分析了长江口毗邻水域的表层悬浮体锋面（浓度≥2mg/L）的周、月变化特征,并对其机制进行了初步分析。研究结果显示,长江口毗邻水域表层悬浮体锋面变化可基本分为4个阶段,即：1~3月的外输稳定阶段、4~5月的向岸退缩阶段、6~8月的内储稳定阶段、9~12月的向海扩张阶段。4月由输变退,9月由退变输,1月向外海扩散面积最为广阔,6月向岸退缩得最近。春夏交替时期悬浮体锋面的退缩速度较秋冬交替时的扩张速度快约1倍。一年中,退缩最快的时段约在第15~17周,扩张最快的时段约为第38~39周。结果还表明悬浮体锋面的变化速度与风速的变化速度有很大的相关性。
基金supported by Tianjin Natural Science Foundation Project(14JCYBJC22500)
文摘Since 2000, red tides have been reported in the Bohai Sea every year, whichoften made coastal waters of the Bohai Sea suffering from red tides. Satellite remotesensing technology and the ocean color observation satellite images have beensuccessfully used to identify and observe the initiation, evolution, and dissipation of redtide. However, due to different water bodies, remote sensing data and modelingmethods, a specific model of red tide inversion should be established for the watercharacteristics of the Bohai Sea. In this paper, the correlation analysis between MODISspectral reflectivity data and measured concentration of chlorophyll a in the Bohai Seawas carried out. The expression （B10-B8） / （B13-B8） was chosen as the indicator of redtide inversion in the Bohai Sea, the correlation coefficient reached 0.7815, showingsignificant correlation results. It was found that the spatial and temporal distribution ofred tide in the Bohai Sea in 2014 was obvious. The main causes of the large-scale outbreak of red tide in the Bohai Sea are due to the poor water exchange caused by thesemi-enclosed geomorphology and the large amount of terrestrial matter input fromcoastal runoff. The river input is the main source of land-based pollution into the sea.Then, a red tide inversion model based on a modified red tide index was established byusing GOCI remote sensing data with less cloud coverage, and proven effective indelineating the red tide in turbid waters. The hourly RI images on 15, 26 and 28 May2014 showed consistent evolution, and the area of red tide in the Bohai Sea changedsignificantly during one day. Vertical migration of the dominant species of red tide algaemay be the main reason for the short-term changes in the surface expression.
