环境科学
气候变化
降水
氮气
地表径流
全球变暖
氮气循环
水循环
营养水平
生态系统
大气科学
生态学
地理
化学
气象学
生物
地质学
有机化学
作者
Gang Zhao,Julian Merder,Tristan Ballard,A. M. Michalak
标识
DOI:10.1073/pnas.2220616120
摘要
Climate change, especially in the form of precipitation and temperature changes, can alter the transformation and delivery of nitrogen on the land surface and to aquatic systems, impacting the trophic states of downstream water bodies. While the expected impacts of changes in precipitation have been explored, a quantitative understanding of the impact of temperature on nitrogen loading is lacking at landscape scales. Here, using several decades of nitrogen loading observations, we quantify how individual and combined future changes in precipitation and temperature will affect riverine nitrogen loading. We find that, contrary to recent decades, rising temperatures are likely to offset or even reverse previously reported impacts of future increases in total and extreme precipitation on nitrogen runoff across the majority of the contiguous United States. These findings highlight the multifaceted impacts of climate change on the global nitrogen cycle.
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