Nutrient management offsets the effect of deoxygenation and warming on nitrous oxide emissions in a large US estuary

被引:0
|
作者
Tang, Weiyi [1 ,3 ]
Da, Fei [1 ]
Tracey, John C. [1 ,4 ]
Intrator, Naomi [1 ]
Kunes, Moriah A. [1 ]
Lee, Jenna A. [1 ]
Wan, Xianhui Sean [1 ,5 ]
Jayakumar, Amal [1 ]
Friedrichs, Marjorie A. M. [2 ]
Ward, Bess B. [1 ]
机构
[1] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA
[2] William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA USA
[3] Univ S Florida, Coll Marine Sci, St Petersburg, FL USA
[4] US DOE, Fusin Energy Sci, Germantown, MD USA
[5] Xiamen Univ, Coll Ocean & Earth Sci, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
来源
SCIENCE ADVANCES | 2024年 / 10卷 / 51期
基金
美国国家科学基金会;
关键词
FRESH-WATER; CLIMATIC INFLUENCES; AMMONIA OXIDATION; MARINE ECOSYSTEMS; CHESAPEAKE BAY; OXYGEN; IMPACTS; DENITRIFICATION; NITRITE; OCEAN;
D O I
10.1126/sciadv.adq5014
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Many estuaries experience eutrophication, deoxygenation and warming, with potential impacts on greenhouse gas emissions. However, the response of N2O production to these changes is poorly constrained. Here we applied nitrogen isotope tracer incubations to measure N2O production under experimentally manipulated changes in oxygen and temperature in the Chesapeake Bay-the largest estuary in the United States. N2O production more than doubled from nitrification and increased exponentially from denitrification when O-2 was decreased from >20 to <5 micromolar. Raising temperature from 15 degrees to 35 degrees C increased N2O production 2- to 10-fold. Developing a biogeochemical model by incorporating these responses, N2O emissions from the Chesapeake Bay were estimated to decrease from 157 to 140 Mg N year(-1 )from 1986 to 2016 and further to 124 Mg N year(-1 )in 2050. Although deoxygenation and warming stimulate N2O production, the modeled decrease in N2O emissions, attributed to decreased nutrient inputs, indicates the importance of nutrient management in curbing greenhouse gas emissions, potentially mitigating climate change.
引用
收藏
页数:12
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