期刊
WATER RESOURCES RESEARCH
卷 57, 期 7, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020WR029371
关键词
Lake Taihu; eutrophication; cyanobacterial bloom; winter warmth; heavy rainfall; positive feedback; shallow lakes
资金
- National Natural Science Foundations of China [41621002, 41790423, 41971146]
- Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [QYZDJ-SSW-DQC008]
- US National Science Foundation [1831096]
- Oceans and Human Health Project (NSF) [1840715]
- Oceans and Human Health Project (NIH) [1P01ES028939-01]
The study finds that regional climate anomalies exacerbate eutrophication in Lake Taihu by intensifying internal nutrient cycling and aggravating cyanobacterial blooms, resulting in a positive feedback mechanism. These regional effects of climate anomalies are nested within larger-scale global warming predicted to continue in the foreseeable future, contributing to the global expansion of eutrophication and blooms, especially in large, shallow, and eutrophic lakes.
Climate warming in combination with nutrient enrichment can greatly promote phytoplankton proliferation and blooms in eutrophic waters. Lake Taihu, China, is a large, shallow and eutrophic system. Since 2007, this lake has experienced extensive nutrient input reductions aimed at controlling cyanobacterial blooms. However, intense cyanobacterial blooms have persisted through 2017 with a record-setting bloom occurring in May 2017. Causal analysis suggested that this bloom was sygenerically driven by high external loading from flooding in 2016 in the Taihu catchment and a notable warmer winter during 2016/2017. High precipitation during 2016 was associated with a strong 2015/2016 El Nino in combination with the joint effects of Atlantic Multi-decadal Oscillation (AMO) and Pacific Decadal Oscillation (PDO), while persistent warmth during 2016/2017 was strongly related to warm phases of AMO and PDO. The 2017 blooms elevated water column pH and led to dissolved oxygen depletion near the sediment, both of which mobilized phosphorus from the sediment to overlying water, further promoting cyanobacterial blooms. Our finding indicates that regional climate anomalies exacerbated eutrophication via a positive feedback mechanism, by intensifying internal nutrient cycling and aggravating cyanobacterial blooms. In light of global expansion of eutrophication and blooms, especially in large, shallow and eutrophic lakes, these regional effects of climate anomalies are nested within larger scale global warming predicted to continue in the foreseeable future.
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