Tracking the Movement and Distribution of Green Tides on the Yellow Sea in 2015 Based on GOCI and Landsat Images

Abstract

: Green tides that developed along the coast of China in 2015 were detected and tracked using vegetation indices from GOCI and Landsat images. Green tides first appeared near the Jiangsu Province on May 14 before increasing in size and number and moving northward to the Shandong Peninsula in mid-June. Typhoon Cham-hom passed through the Yellow Sea on July 12, significantly decreasing the algal population. An algae patch moved east toward Korea and on June 18 and July 4, several masses were found between the southwestern shores of Korea and Jeju Island. The floating masses found in Korean waters were concentrated at the boundary of the open sea and the Jindo cold pool, a phenomenon also observed at the boundary of coastal and offshore waters in China. Sea surface temperatures, derived from NOAA SST data, were found to play a role in generation of the green tides.

Monitoring the Dissipation of the Floating Green Macroalgae Blooms in the Yellow Sea (2007–2020) on the Basis of Satellite Remote Sensing

“…The world's largest MABs of Ulva prolifera ("green tide") have occurred every summer in the Yellow Sea since 2007, causing serious ecological, environmental, and socioeconomic problems [5,6]. Scholars at home and abroad have conducted a lot of research on green tide, mostly concentrated on remote sensing monitoring methods [7][8][9], sub-pixel coverage area estimation methods [10,11], origin [12][13][14], evolution process [15,16] and driving mechanisms [17][18][19], etc., and they have achieved good results. At present, the remote sensing monitoring methods of the green tide are basically mature and the overall understanding and the early development processes are largely clear: many studies from multiple perspectives including satellite remote sensing, ocean circulation models, and field observations indicate that U. prolifera originates in the Subei Shoal of Jiangsu Province [20][21][22][23][24][25], which is related to the increased cultivation of seaweed Shoal of Jiangsu Province [20][21][22][23][24][25], which is related to the increased cultivation of seaweed (Porphyra yezoensis) in this area [14,22].…”

A simple method for estimating macroalgae area under clouds on MODIS imagery

“…In much of the research, satellite data have played a vital role because of the advantages of having a synoptic view and repeated observations. The patterns associated with MABs, especially their origin and development, have become fairly well understood with the help of remote sensing data (Hu, 2009;Son et al, 2012;Xu et al, 2014;Zhou et al, 2014;Qi et al, 2016;Min et al, 2017;Qiu et al, 2018;Cao et al, 2019;Chen et al, 2020).…”