Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers
Abstract Many lakes in China suffer from algal bloom problems. However, the spatial and temporal distribution of lacustrine algal blooms at the national scale has not been well characterized. Here, we developed an automated algal bloom surface scums (hereafter referred to as algal bloom) detection a...
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| Format: | Article |
| Language: | English |
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Wiley
2023-10-01
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| Series: | Water Resources Research |
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| Online Access: | https://doi.org/10.1029/2022WR033340 |
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| author | Ying Wang Lian Feng Xuejiao Hou |
| author_facet | Ying Wang Lian Feng Xuejiao Hou |
| author_sort | Ying Wang |
| collection | DOAJ |
| description | Abstract Many lakes in China suffer from algal bloom problems. However, the spatial and temporal distribution of lacustrine algal blooms at the national scale has not been well characterized. Here, we developed an automated algal bloom surface scums (hereafter referred to as algal bloom) detection algorithm for Moderate‐Resolution Imaging Spectroradiometer (MODIS) images based on a normalized floating algal index and the Commission on Illumination colorimetry system. This algorithm was then applied to 35,556 daily MODIS images acquired between 2003 and 2020 to hindcast the spatial and temporal dynamics of lacustrine algal blooms in 171 lakes in China. The results show that 103 (60.2%) of the examined lakes have been affected by algal blooms over the past two decades, and the bloom occurrence in 95 lakes showed an increasing trend. The prevailing increasing trends of algal blooms in Chinese lakes were also manifested by an earlier onset time and prolonged potential occurrence period. We found that approximately 80% of the historical algal blooms occurred under calm water surfaces (wind speed <3 m/s) and high temperatures (>16°C), and we revealed positive correlations between bloom occurrence and fertilizer use. We further demonstrated that the increasing trends in algal blooms were highly linked to recent increases in air temperature. The results here not only highlight the severe lacustrine algal bloom problems in China but also provide important baseline information for lake management and restoration efforts for the government. |
| format | Article |
| id | doaj-art-37a8705c1e8d4b7cb6deefadf4fdd628 |
| institution | OA Journals |
| issn | 0043-1397 1944-7973 |
| language | English |
| publishDate | 2023-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Water Resources Research |
| spelling | doaj-art-37a8705c1e8d4b7cb6deefadf4fdd6282025-08-20T02:35:08ZengWileyWater Resources Research0043-13971944-79732023-10-015910n/an/a10.1029/2022WR033340Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and DriversYing Wang0Lian Feng1Xuejiao Hou2School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Geospatial Engineering and Science Sun Yat‐Sen University Guangzhou ChinaAbstract Many lakes in China suffer from algal bloom problems. However, the spatial and temporal distribution of lacustrine algal blooms at the national scale has not been well characterized. Here, we developed an automated algal bloom surface scums (hereafter referred to as algal bloom) detection algorithm for Moderate‐Resolution Imaging Spectroradiometer (MODIS) images based on a normalized floating algal index and the Commission on Illumination colorimetry system. This algorithm was then applied to 35,556 daily MODIS images acquired between 2003 and 2020 to hindcast the spatial and temporal dynamics of lacustrine algal blooms in 171 lakes in China. The results show that 103 (60.2%) of the examined lakes have been affected by algal blooms over the past two decades, and the bloom occurrence in 95 lakes showed an increasing trend. The prevailing increasing trends of algal blooms in Chinese lakes were also manifested by an earlier onset time and prolonged potential occurrence period. We found that approximately 80% of the historical algal blooms occurred under calm water surfaces (wind speed <3 m/s) and high temperatures (>16°C), and we revealed positive correlations between bloom occurrence and fertilizer use. We further demonstrated that the increasing trends in algal blooms were highly linked to recent increases in air temperature. The results here not only highlight the severe lacustrine algal bloom problems in China but also provide important baseline information for lake management and restoration efforts for the government.https://doi.org/10.1029/2022WR033340lake algal bloomseutrophicationwater qualityMODISChina |
| spellingShingle | Ying Wang Lian Feng Xuejiao Hou Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers Water Resources Research lake algal blooms eutrophication water quality MODIS China |
| title | Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers |
| title_full | Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers |
| title_fullStr | Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers |
| title_full_unstemmed | Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers |
| title_short | Algal Blooms in Lakes in China Over the Past Two Decades: Patterns, Trends, and Drivers |
| title_sort | algal blooms in lakes in china over the past two decades patterns trends and drivers |
| topic | lake algal blooms eutrophication water quality MODIS China |
| url | https://doi.org/10.1029/2022WR033340 |
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