研究人员利用几十年的氮负荷观测，量化了未来降水和温度的单独和综合变化将如果影响河流的氮负荷。研究发现，与近几十年相反，不断上升的气温可能会抵消甚至扭转先前报道的未来总降水量和极端降水量，增加美国大部分邻近地区氮径流的影响。这些发现强调了气候变化对全球氮循环的多方面影响。
据了解，气候变化，特别是降水和温度变化的形式，可以改变氮在地表和水生系统中的转化和输送，影响下游水体的营养状态。虽然有研究人员已经探索了降水变化的预期影响，但是仍然缺乏温度对氮负荷的影响的定量理解。
附：英文原文
Title: Warming may offset impact of precipitation changes on riverine nitrogen loading
Author: Zhao, Gang, Merder, Julian, Ballard, Tristan C., Michalak, Anna M.
Issue&Volume: 2023-8-7
Abstract: 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.
DOI: 10.1073/pnas.2220616120
Source: https://www.pnas.org/doi/10.1073/pnas.2220616120