大型浅水湖泊叶绿素a浓度对高温热浪响应的模拟研究OA
Simulation study on the response of chlorophyll-a concentration to extreme heatwaves in a large shallow lake
随着全球变暖加剧,热浪事件频率与强度显著增加.探究热浪对湖泊营养盐、叶绿素a(Chl.a)及浮游植物生长等生态过程的影响,有助于揭示湖泊在热浪条件下的生态响应机制,并为气候变化下湖泊的管理与调控提供科学支撑.本研究基于GOTM-WET模型,模拟了2022年夏季热浪对北太湖(梅梁湾)Chl.a浓度的影响,重点分析了不同热浪强度对Chl.a的影响效应及其可能机制.结果表明,2022年夏季热浪显著抑制了Chl.a浓度,且抑制效应随热浪强度的增加而增强.进一步分析发现,2022年热浪期间最高水温超过37 ℃,可能超出了大多数藻类的最适生长温度,从而抑制藻类生长.此外,热浪期间水柱分层加剧,导致总氮和总磷浓度在表层水体降低而在底层积累,这种营养盐垂直分异限制了表层藻类生长所需的营养供给,同样也会抑制Chl.a浓度的升高.本研究揭示了极端高温条件下水温和营养盐双重因素对湖泊藻类生长 的潜在影响机制,深化了对热浪事件影响湖泊生态系统过程的理解.
The world is getting hotter and hotter,causing more and more heatwaves.It is very important to study how these factors affect the environment,for example the nutrients in lakes,the concentration of chlorophyll-a(Chl.a)in water,and the growth of phytoplankton.This will help us to understand how lakes respond to and recover from heatwaves,and it will provide scientific sup-port for the management and regulation of lakes under climate change.This study used the GOTM-WET model to see what effect the 2022 summer heatwave had on the amount of Chl.a in northern Lake Taihu.It looked at how different levels of heatwave inten-sity affected Chl.a and what might be causing this.The results showed that the 2022 summer heatwave greatly reduced the concen-tration of Chl.a in water,and the effect of this was stronger with the higher heatwave intensity.Further analysis showed that the maximum water temperature during the 2022 heatwave exceeded 37 ℃,which could have been too hot for most algae to grow.The heatwave also made the water more mixed up,with less nitrogen and phosphorus in the surface layer and more in the bottom layer.This meant there was less nutrition available for surface algae growth,which also meant there was less Chl.a.This study looked at how water temperature and nutrients can affect the growth of algae in lakes when it is very hot.It helps us to understand more about how heatwaves affect the natural processes in lakes.
Yue Lintan;Qin Boqiang;Yang Yifan;Zhuang Xinfeng;Chen Weiyu;Kong Xiangzhen;Deng Jianming;Zhao Zhonghua;Lu Yingcheng;Zhu Guangwei
School of Geography and Ocean Science,Nanjing University,Nanjing 210023,P.R.ChinaSchool of Geography and Ocean Science,Nanjing University,Nanjing 210023,P.R.China||Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135,P.R.ChinaSchool of Geography and Ocean Science,Nanjing University,Nanjing 210023,P.R.ChinaNanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135,P.R.ChinaSchool of Civil Engineering and Civil Engineering,Jiangsu Open University,Nanjing 210036,P.R.ChinaNanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135,P.R.ChinaNanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135,P.R.China||School of Atmospheric Sciences,Nanjing University,Nanjing 210023,P.R.ChinaNanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135,P.R.ChinaInternational Institute of Earth System Science,Nanjing University,Nanjing 210023,P.R.ChinaNanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135,P.R.China
太湖夏季热浪叶绿素a总氮总磷GOTM-WET模型梅梁湾
Lake Taihusummer heatwavechlorophyll-atotal nitrogentotal phosphorusGOTM-WET modelMeiliang Bay
《湖泊科学》 2026 (1)
65-77,中插11-中插13,16
国家重点研发计划项目(2022YFC3202004)、湖泊与流域水安全全国重点实验室重点项目(NKL2023-KP01)和国家自然科学基金项目(42371016,42220104010)联合资助.
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