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| 大型浅水湖泊叶绿素a浓度对高温热浪响应的模拟研究 |
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岳林坦1, 杨逸帆1, 庄新凤2, 陈韦钰3, 孔祥臻2, 邓建明4,2, 赵中华2, 陆应诚5, 朱广伟2, 秦伯强1,2
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1.南京大学地理与海洋科学学院;2.中国科学院南京地理与湖泊研究所;3.江苏开放大学建筑工程学院;4.南京大学大气科学学院;5.南京大学国际地球系统科学研究所
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| 摘要: |
| 全球变暖加剧，热浪事件频率与强度显著增加，探究其对湖泊营养盐、叶绿素a（Chla）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）Chla浓度的影响，重点分析了不同热浪强度对Chla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Chla浓度，且抑制效应随热浪强度的增加而增强。通过进一步分析发现，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佳生长温度，从而抑制了藻类生长。此外，热浪期间水柱分层加剧，导致总氮（TN）和总磷（TP）浓度在表层减少而在底层积累，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Chla浓度的增长。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。 |
| 关键词: 夏季热浪 Chla TN TP GOTM-WET 梅梁湾 |
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| 基金项目:“十四五”国家重点研发计划(2022YFC3202004)、湖泊与流域水安全重点实验室重点项目（NKL2023-KP01）、国家自然科学基金项目(42371016、42220104010) |
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| Simulation study on the response of chlorophyll-a concentration to extreme heatwaves in ａlarge shallow lake |
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Yue Lintan,Yang Yifan,Zhuang Xinfeng,Chen Weiyu,Kong Xiangzhen,Deng Jianming,Zhao Zhonghua,Lu Yingcheng,Zhu Guangwei,Qin Boqiang
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1.School of Atmospheric Sciences, Nanjing University;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences
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| Abstract: |
| The intensification of global warming has led to a significant increase in the frequency and intensity of heatwave events. Exploring their impact on ecological processes such as lake nutrient salts, chlorophyll-a (Chla), and phytoplankton growth is crucial for understanding the ecological response and feedback mechanisms of lakes under heatwave conditions and providing scientific support for lake management and regulation under climate change. This study, based on the GOTM-WET model, simulated the impact of the 2022 summer heatwave on Chla concentration in North Taihu Lake, with a focus on analyzing the effects of different heatwave intensities on Chla and their possible mechanisms. The results indicated that the 2022 summer heatwave significantly suppressed Chla concentration, and the inhibitory effect intensified with the increase in heatwave intensity. Further analysis revealed that the maximum water temperature during the 2022 heatwave exceeded 37°C, possibly surpassing the optimal growth temperature for most algae, thereby inhibiting their growth. Additionally, the heatwave intensified water column stratification, leading to a reduction in total nitrogen (TN) and total phosphorus (TP) concentrations in the surface layer and their accumulation in the bottom layer. This vertical differentiation of nutrients limited the nutrient supply required for surface algae growth, further suppressing the increase in Chla concentration. This study revealed the potential impact mechanisms of dual factors of water temperature and nutrients on lake algae growth under extreme high-temperature conditions, deepening the understanding of the effects of heatwave events on lake ecosystem processes. |
| Key words: Summer Heatwave Chla TN TP meiliang bay |
