Teleconnection between climate oscillations and riverine nutrient dynamics in Southeast China based on wavelet analysis
Teleconnection between climate oscillations and riverine nutrient dynamics in Southeast China based on wavelet analysis
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DOI：
10.1007/s11356-021-13715-x
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发表时间：
2021-03
影响因子：
5.8
通讯作者：
Yun Hao;Jun Lu
中科院分区：
文献类型：
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作者：
Yun Hao;Jun Lu
非点源污染主要由水文过程驱动，气候振荡会影响区域水循环过程。但气候振荡与水体污染之间的关系尚不清楚，这增加了水质预测和管理的难度。采用Mann-Kendall检验和小波变换分析方法，研究了2003 - 2016年中国东南部某农业流域ENSO（厄尔尼诺-南方涛动）现象与河流径流负荷动态的遥相关关系。结果表明，年降水量，径流量和河流营养盐负荷显着增加，在研究期间。河流TN和TP长期负荷的变化点分别出现在2009年和2007年。降雨、径流、营养盐负荷和Niño 3.4海温（SST）具有10 - 16个月的共同周期。南方涛动指数（SOI）和Niño3.4海温具有28 - 36个月的周期。此外，Niño3.4 SST与河流营养盐负荷呈10-16个月的正相关，SOI与河流营养盐负荷呈28-36个月的弱负相关。这些结果表明，暖ENSO事件的发生频率增加将增加中国东南部河流营养盐输出的风险，在农业营养盐污染预测和农业流域水质管理中应更多地关注大尺度气候振荡。
Nonpoint source (NPS) pollution is mainly driven by hydrological processes; climate oscillation can affect regional water cycle processes. However, the relationship between climate oscillation and NPS pollution is still unclear, which increases the difficulty of water quality prediction and management. In this study, Mann-Kendall test and wavelet transform were adopted to investigate the teleconnection between ENSO (El Niño–Southern Oscillation) phenomenon and riverine NPS load dynamics in an agricultural watershed of Southeast China from 2003 to 2016. Results showed that annual precipitation, streamflow, and riverine nutrient load increased significantly during the study period. The change point for long-term riverine TN load and TP load appeared in 2009 and 2007, respectively. Rainfall, streamflow, nutrient loads, and Niño 3.4 sea temperature (SST) shared a common periodicity of 10–16 months. The southern oscillation index (SOI) and Niño 3.4 SST shared a common periodicity of 28–36 months. Moreover, Niño 3.4 SST showed a positive correlation with riverine nutrient loads at a periodicity of 10–16 months, while SOI showed a weakly negative correlation with riverine nutrient loads at a periodicity of 28–36 months. These findings indicate that the increasing frequency of warm ENSO events would enhance the risk of nutrient export to rivers in Southeast China and more attention should be paid to large-scale climate oscillation in the prediction of agricultural nutrient pollution and management of water quality in agricultural watersheds.