4.7 Article

Long-term atmospheric inorganic nitrogen deposition in West African savanna over 16 year period (Lamto, Cote d'Ivoire)

期刊

ENVIRONMENTAL RESEARCH LETTERS
卷 16, 期 1, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1748-9326/abd065

关键词

sub Saharan Africa; wet savanna ecosystem; inorganic nitrogen; wet and dry depositions; trends

资金

  1. CNRS/INSU (Centre National de la Recherche Scientifique/Institut National des Sciences de l'Univers)
  2. ACTRIS-FR Research Infrastructure and IRD (Institut de Recherche pour le D'eveloppement)

向作者/读者索取更多资源

The study presents a long-term trend analysis of atmospheric inorganic nitrogen deposition in Sub Saharan Africa from 2000 to 2015, showing decreasing trends in dry nitrogen deposition but increasing trends in wet nitrogen deposition, indicating changes in agricultural practices in the area.
We present a long term assessment trend of atmospheric inorganic nitrogen deposition in Sub Saharan Africa (2000-2015) using observational and model data. This work proposes a compilation of International Network to study Deposition and Atmospheric chemistry in Africa wet and dry nitrogen deposition fluxes collected at the wet savanna site of Lamto (Cote d'Ivoire). Total deposition calculation takes in account: (a) gaseous (NO2, NH3, HNO3) dry deposition fluxes estimated by considering nitrogen compound concentrations at the monthly scale and modeling average monthly dry deposition velocities, (b) particulate PM10 (pNO(3)(-), pNH(4)(+)) dry deposition fluxes calculated using the same inferential method and (c) wet deposition (WD) fluxes including ions concentration measurements (NO3-, NH4+) in rainwater combined with rainfall amount. We demonstrate for the first time the monthly and annual decreasing trends for dry nitrogen deposition of N-NO2 (-2.33% month(-1) and -2.54% yr(-1)) and N-NH3 (-2.55% month(-1) and -2.89% yr(-1)), but increasing trends for dry deposition of N-HNO3 (+1.00% month(-1)) and WD of N-NO3- (+1.67% month(-1) and +2.13% yr(-1)) and N-NH4+ (+2.33% month(-1) and +3.36% yr(-1)). Dry season N-NO2 deposition flux decline shows agreement with long term trend in NOx emissions by biomass burning. Increasing trends for wet N deposition signals a gradual increase of nitrogen fertilizers use in agricultural practices in the Lamto area. Results also show no significant trend in total N deposition over the 16 year study period explained by the compensation of decreasing and increasing trends for dry and wet N deposition, respectively. However, at the annual scale, the mean total N deposition flux is estimated to 10.3 +/- 1.2 kgN ha(-1) yr(-1) over the 16 year period, indicating an increase of 8% compared to the period 2000-2007.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据