GIS Technology Research Center of Resource and Environment in Western China, Ministry of Education, Yunnan Normal University, Yunnan, 650500, China.
School of Information Science and Technology, Yunnan Normal University, Yunnan, 650500, China.
Environ Sci Pollut Res Int. 2022 Jan;29(2):2547-2554. doi: 10.1007/s11356-021-15621-8. Epub 2021 Aug 9.
Lake surface water temperature (LSWT) plays an important role in the metabolism of aquatic organisms, and is also an important indicator in lake ecosystems which affects the ecology and biogeochemical processes of lakes. The current research mainly focuses on the long-term trends of LSWT and the impact of climate warming on LSWT. Researchers have not paid enough attention to the study of extreme changes in trend of LSWT. An ice-free lake in China called Dianchi Lake was selected as our research area. We carried out a quantitative analysis of and provided a discussion on the changes in the maximum lake surface water temperature (MLSWT) from 2001 to 2018 at two timescales (month and year) based on MODIS 11A2 composite product data and water temperature environment of cyanobacteria outbreaks. The results showed that the MLSWT of Dianchi Lake increased between 2001 and 2018 and continued to exceed the temperature threshold (17.6°C) for cyanobacterial outbreaks during some timeframes and that the duration of high temperatures also increased. This phenomenon will extend the suitable growth period of cyanobacteria and will have a complex and long-term impact on water quality, the lake ecological environment, and the growth of aquatic organisms.
湖泊表层水温（LSWT）在水生生物代谢中起着重要作用，也是影响湖泊生态系统的重要指标，它影响着湖泊的生态学和生物地球化学过程。目前的研究主要集中在 LSWT 的长期趋势和气候变暖对 LSWT 的影响上。研究人员尚未充分关注 LSWT 趋势的极端变化。本研究选取中国无冰湖泊滇池作为研究区，利用 MODIS11A2 合成产品数据和水华爆发水温环境，基于月和年两个时间尺度，对 2001-2018 年滇池最大湖表水温（MLSWT）的变化进行了定量分析和讨论。结果表明，滇池 MLSWT 在 2001-2018 年间呈上升趋势，且在部分时间段内持续超过蓝藻水华爆发的温度阈值（17.6°C），高温持续时间也有所增加。这种现象将延长蓝藻的适宜生长期，并对水质、湖泊生态环境和水生生物的生长产生复杂而长期的影响。
