首页|Characteristics of atmospheric nitrous oxide observed at Mt.Waliguan GAW global station in the inland Eurasia during eighteen years

Characteristics of atmospheric nitrous oxide observed at Mt.Waliguan GAW global station in the inland Eurasia during eighteen years

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This study presents atmospheric N2O mole fractions measured from discrete air samples from 2001 to 2018 at Mt.Waliguan(WLG)station(36°17′N,100°54′E,3816 m asl)in China,which is a global background station of the World Meteorological Organization/Global Atmosphere Watch Programme(WMO/GAW)in central Eurasia.Observed N2O char-acteristics of annual means,interannual variability,and seasonal cycles were investigated.Our results show that N2O at WLG possess a distinct increasing trend and a statistically significant seasonal cycle,with an average growth rate of 0.9±0.01 ppb yr-1(1 σ)(1ppb=10-9),which is close to the global mean.The detrended seasonal cycle shows a trough of-0.25±0.04(1σ)ppb in June and a peak of 0.13±0.07(1 σ)ppb in September,with an amplitude of 0.38 ppb.The pattern is due to combined effects of variation in surface sources,vertical convection within the boundary layer and stratosphere to troposphere transportation(STE).The interannual variability in growth rate was partly driven by quasi-biennial oscillation(QBO)of tropical zonal wind through stratospheric transport into the troposphere.According to a cluster analysis of back trajectories and the corresponding average N2O load,most air masses cover arid and semi-arid areas in inner Asia with low N2O emissions,indicating that the atmospheric N2O at the WLG represents the background N2O level in central Eurasia.

Nitrous oxide(N2O)ObservationLong-term trendSeasonal variationInterannual variability

Miao LIANG、Shuangxi FANG、Lixin LIU、Yong ZHANG、Jianqiong WANG、Shuo LIU、Hongyang WANG、Liangchun DENG

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Meteorological Observation Centre(MOC),China Meteorological Administration(CMA),Beijing 100081,China

College of Environment,Zhejiang University of Technology,Hangzhou 310014,China

Mt.Waliguan Background Station,China Meteorological Administration(CMA),Xining 810001,China

State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

Center for Environmental Progress,Wuhan 430070,China

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National Natural Science Foundation of China

41730103 & 41805129

2024

10.1007/s11430-023-1197-7

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(1)
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