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Maximum lake surface water temperatures changing characteristics under climate change.
Jiaying Yang1,2, Kun Yang3,1, Yueyue Zhang1,4
1GIS Technology Research Center of Resource and Environment in Western China, Ministry of Education, Yunnan Normal University, Yunnan, 650500, China.
Environmental Science and Pollution Research International
|August 9, 2021
Summary
Maximum lake surface water temperature (MLSWT) in China's Dianchi Lake is rising, exceeding thresholds for cyanobacteria outbreaks and increasing their duration. This trend impacts aquatic ecosystems and water quality.
Area of Science:
- Environmental Science
- Limnology
- Climate Change Research
Background:
- Lake surface water temperature (LSWT) is crucial for aquatic metabolism and lake ecosystem health.
- Existing research often overlooks extreme LSWT changes, focusing on long-term trends and climate warming impacts.
- Cyanobacteria outbreaks are linked to specific water temperature thresholds.
Purpose of the Study:
- To quantitatively analyze changes in maximum lake surface water temperature (MLSWT) in Dianchi Lake from 2001 to 2018.
- To assess the relationship between MLSWT trends and the water temperature environment conducive to cyanobacteria outbreaks.
- To investigate extreme changes in LSWT trends, which have been understudied.
Main Methods:
- Utilized MODIS 11A2 composite product data for quantitative analysis.
- Analyzed MLSWT data at monthly and yearly timescales from 2001 to 2018.
- Correlated MLSWT data with the known temperature thresholds for cyanobacteria outbreaks.
Main Results:
- Observed a significant increasing trend in Dianchi Lake's MLSWT between 2001 and 2018.
- MLSWT frequently exceeded the 17.6°C threshold for cyanobacterial outbreaks during analyzed periods.
- The duration of high-temperature periods, favorable for cyanobacteria, also increased.
Conclusions:
- Rising MLSWT in Dianchi Lake extends the suitable growth period for cyanobacteria.
- Increased cyanobacteria growth poses complex, long-term risks to water quality and the lake's ecological environment.
- The study highlights the need for focused research on extreme LSWT events and their ecological consequences.
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