4.7 Article

Tracking spatio-temporal dynamics of harmful algal blooms using long-term MODIS observations of Chaohu Lake in China from 2000 to 2021

期刊

ECOLOGICAL INDICATORS
卷 146, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.ecolind.2022.109842

关键词

Harmful algal blooms (HABs) distribution; Spatio-temporal dynamics; Meteorological factor; Human activities; Floating algae index; Chaohu Lake

资金

  1. Natural Science Fund of China [U2243228]
  2. Natural Science Fund of Anhui Province [2008085ME158]
  3. Anhui Province Key Laboratory of In-dustrial Wastewater and Environmental Treatment [ECEC-DHSZ202202]

向作者/读者索取更多资源

This study analyzed the spatio-temporal dynamics of harmful algal blooms (HABs) in Chaohu Lake, China from 2000 to 2021. The results showed that HABs in the lake have generally been increasing over the past two decades, with intermittent decreases in 2016-2017 and 2020-2021. HABs were most severe and frequent in the northwestern area of the lake. Temperature and precipitation were identified as the main meteorological factors correlated with HABs. The study also found that the rapid socioeconomic development and eutrophication of the lake contributed to the occurrence of HABs. However, environmental management policies implemented since 2020 have significantly reduced the severity of HABs by decreasing the lake's nutrient levels.
Harmful algal blooms (HABs) have long been a critical threat to environmental safety and health, especially in inland lakes with rapidly growing socioeconomic development. Although satellite remote sensing provides an efficient manner to observe floating algae blooms, tracing and capturing the distribution of HABs in water bodies remains challenging for their high dynamics in both spatial and temporal dimensions. This study analyzed the spatio-temporal dynamics of HABs in Chaohu Lake, China, from 2000 to 2021. Daily MODIS remote sensing observations, including 7926 images, were utilized. The Floating Algae Index (FAI) was applied to each image to detect the area and severity of HABs. Results show that the HABs in Chaohu Lake have generally been increasing in the past two decades, with two intermittent decreases in 2016-2017 and 2020-2021, and the duration of HABs tended to be longer over the years. HABs were most severe and frequent in the lake's northwestern area. Temperature and precipitation are two main meteorological factors positively correlated with HABs. The fast-growing socio-economy reflected by population and GDP increase lake eutrophication and HABs. However, environment management policies since 2020 have had a significant and rapid influence in decreasing the lake's nutrients, which greatly reduced HABs severity in 2020 and 2021. This study's results further indicate that high -frequency remote sensing observations, although with occasional data missing due to cloud cover, can still perform well in describing HABs, as long as the analysis method is appropriately adopted. This finding provides potential significance for utilizing remote sensing products, especially for highly dynamic object observation where high-quality images are lacking.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据