Tracing floating green algae blooms in the Yellow Sea and the East China Sea using GOCI satellite data and Lagrangian transport simulations
Tracing floating green algae blooms in the Yellow Sea and the East China Sea using GOCI satellite data and Lagrangian transport simulations
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DOI：
10.1016/j.rse.2014.09.024
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发表时间：
2015
影响因子：
13.5
通讯作者：
Y. Son;Byoung-Ju Choi;Y. H. Kim;Young‐Gyu Park
中科院分区：
文献类型：
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作者：
Y. Son;Byoung-Ju Choi;Y. H. Kim;Young‐Gyu Park
在2011年6月13日地球同步海洋水色成像仪（GOCI）拍摄的图像中，青岛周围发现了经常性的漂浮绿色藻类水华。为了检测霜，使用基于使用三个波长（555、660、745 nm）的多光谱带比的指数。一个月后，GOCI图像检测到广泛的漂浮绿色藻类斑块（东西向细长）横跨黄海和东海（YS，ECS）。利用拉格朗日粒子追踪实验研究了漂浮绿色藻类斑块的路径，并解释了影响漂浮绿色藻类分布和平流的物理强迫因子。数值模拟结果表明，2011年6 - 7月的主导偏南风与漂浮绿色藻类的离岸移动有关，尤其是在YS/ECS中的东移。2011年6月发生了一次罕见的不寻常事件：台风MEARI导致绿色藻类脱离海岸，并开始向东移动。台风发生后，海表温度迅速恢复，足以生长漂浮的绿色藻类，和风和当地电流控制的移动的大规模的漂浮藻类斑块（沿海积累或近海平流在YS/ECS）。对2011年7月台风MAON经过期间漂浮的绿色藻类像素移动的分析表明，漂浮的绿色藻类斑块受到洋流和增强的风的显着控制。研究结果表明，2011年夏季青岛近海、黄海和东海中部海域发生的漂浮绿色藻水华是近期海藻养殖规模迅速扩大、大风以及水华暴发区风场共同作用的结果。我们的综合方法，利用卫星数据和数值模拟，提供了一个强大的估计跟踪和监测变化的绿色藻类水华在区域范围内。
In an image from the Geostationary Ocean Color Imager (GOCI) taken on 13 June 2011, a recurrent floating green algae bloom was detected around Qingdao. To detect the bloom an index based on multi-spectral band ratios using three wavelengths (555, 660, 745 nm) was utilized. One month later, the GOCI images detected widespread floating green algae patches (east–west elongated) across the Yellow Sea and East China Sea (YS, ECS). The presence of the patches was confirmed from various oceanic observation cruises.Lagrangian particle tracking experiments were conducted to understand the pathway of the floating green algae patches and interpret the physical forcing factors that affect the distribution and advection of the floating green algae. The numerical simulation results indicated that dominant southerly winds during June and July 2011 were related to offshore movement of the floating green algae, especially their eastward extension in the YS/ECS. An infrequent and unusual event occurred in June 2011: a typhoon MEARI, caused the green algae to detach from the coast and initiated movement to the east. After the typhoon event, sea surface temperature recovered rapidly enough to grow the floating green algae, and wind and local current controlled the movement of the massive floating algae patches (coastal accumulation or offshore advection in the YS/ECS). Analysis of the floating green algae pixels' movement during passage of Typhoon MAON in July 2011 revealed that the floating green algae patches were significantly controlled by both ocean currents and enhanced winds. These findings suggest that the floating green algae bloom off Qingdao and in the middle of the YS and ECS in the summer of 2011 occurred due to the combined effects of recent rapid expansion of seaweed aquaculture, strong winds, and the wind patterns in blooming regions. Our combined approach, using satellite data and numerical simulations, provides a robust estimate for tracing and monitoring changes in green algae blooms on a regional scale.