| 富春江库区高温热浪变化特征及对藻类水华潜在影响研究 |
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| 引用本文： | 黄群芳,国超旋,李娜,李渊.富春江库区高温热浪变化特征及对藻类水华潜在影响研究[J].环境科学研究,2022,35(2):530-539. |
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| 作者姓名： | 黄群芳 国超旋 李娜 李渊 |
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| 作者单位： | 1.江苏第二师范学院城市与资源环境学院，江苏 南京 210013 |
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| 基金项目： | 国家自然科学基金项目(No.41901198,41771514,41830757)~~； |
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| 摘 要： | 随着全球气候变暖，夏季高温热浪出现频次、强度和持续时间明显增加. 为探明气候变暖引起的夏季高温热浪对藻类水华及淡水生态系统的影响， 基于长期气象观测、高频浮标水温监测、藻华过程浮游植物生物量连续监测以及卫星遥感反演，分析了富春江库区夏季高温热浪长期变化特征以及2016年高温热浪对富春江水库藻类水华的影响过程. 结果表明:①1972—2020年近50年富春江水库呈现明显的区域增温，平均气温增速为0.35 ℃/(10 a)，2016年达最高值(18.13 ℃)；与此同时，高温热浪频次和天数也显著增加，且起始时间显著提前，结束时间显著推迟，2016年经历了近50年来较严重的高温热浪事件. ②野外实测和卫星遥感反演表明，2016年7—8月富春江水库暴发严重的藻类水华，库区叶绿素a浓度在8月19日达最高值〔(65.3±21.3) μg/L〕. ③因果分析显示，高温热浪引起的气温和水温增加、降水和风速减少以及热力分层强化等直接或者间接诱发和促进了浮游植物生物量累积及蓝藻水华形成. 研究显示，夏季高温热浪加剧了富春江水库藻类水华暴发，未来全球变暖背景下高温热浪频次和强度将继续增加，需开展高频同步监测和受控试验，深入揭示高温热浪对藻类水华形成的驱动机制.
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| 关 键 词： | 高温热浪 气候变暖 藻类水华 叶绿素a 富春江水库 遥感估算 |
| 收稿时间： | 2021-10-13 |
Characteristics of Summer Heat Waves and Potential Effect on Algal Blooms in Fuchunjiang Reservoir |
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| HUANG Qunfang,GUO Chaoxuan,LI Na,LI Yuan.Characteristics of Summer Heat Waves and Potential Effect on Algal Blooms in Fuchunjiang Reservoir[J].Research of Environmental Sciences,2022,35(2):530-539. |
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| Authors: | HUANG Qunfang GUO Chaoxuan LI Na LI Yuan |
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| Affiliation: | 1.College of Urban, Resources and Environmental Science, Jiangsu Second Normal University, Nanjing 210013, China2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China3.School of Tourism and Urban & Rural Planning, Zhejiang Gongshang University, Hangzhou 310018, China |
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| Abstract: | Global climate warming has caused a significant increase in the frequency, intensity, and duration of summer heat waves. To investigate the effects of summer heat wave caused by climate warming on algal bloom and freshwater ecosystem, we present the long-term trend of summer heat waves and explore the effect of summer heat waves on algal blooms in the Fuchunjiang Reservoir in 2016 based on long term meteorological observation, high frequency buoy water temperature observation, continuous field monitoring and remote sensing estimation of phytoplankton biomass during algal bloom. The results show that: (1) In the past 50 years (1972-2020), the annual average air temperature increased significantly (0.35 °C per decade) and the highest temperature in the Fuchunjiang Reservoir was 18.13 °C in 2016. Meanwhile, the frequency and number of days of heat waves significantly increased, the start dates significantly advanced, and the end dates significantly delayed, resulting in a significant increase in heat waves duration. Overall, the Fuchunjiang Reservoir experienced relatively severe heat waves in 2016 in the past 50 years. (2) Both field monitoring and remote sensing estimation showed serious algal blooms in the Fuchunjiang Reservoir during July-August. Chlorophyll a concentration reached a maximum of (65.3±21.3) μg/L at the peak of the summer heatwave on August 19th. (3) Causal analysis showed that the increases in air and water temperature, the decreases in wind speed and rainfall, thermal stratification strengthening driven by heat waves induced and boosted phytoplankton growth, biomass accumulation and algal blooms. Therefore, the close relationship between the heat waves and algal blooms in 2016 summer indicated that heat waves might aggravate the occurrence of algal blooms. However, more studies are needed to examine the driving mechanism of heat waves on algal bloom formation using high-frequency synchronous monitoring and controlled experiments with lake heat waves projected to increase in frequency, duration, and spatial extent with global climate change. |
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