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Distinguishing the impacts of natural and anthropogenic aerosols on global gross primary productivity through diffuse fertilization effect.
- Source :
- Atmospheric Chemistry & Physics Discussions; 9/16/2021, p1-35, 35p
- Publication Year :
- 2021
-
Abstract
- Aerosols can enhance ecosystem productivity by increasing diffuse radiation. Such diffuse fertilization effects (DFEs) vary among different aerosol compositions and sky conditions. Here, we apply a suite of chemical, radiation, and vegetation models in combination with ground- and satellite-based measurements to assess the impacts of natural and anthropogenic aerosol species on gross primary productivity (GPP) through DFE during 2001-2014. Globally, aerosols increase GPP by 8.9 Pg C yr<superscript>-1</superscript> at clear skies but only 0.95 Pg C yr<superscript>-1</superscript> at all skies. Anthropogenic aerosols account for 41% of the total GPP enhancement though they contribute only 25% to the increment of diffuse radiation. Sulfate/nitrate aerosols from anthropogenic sources make dominant contributions of 33% (36%) to aerosol DFE at all (clear) skies, followed by the ratio of 18% (22%) by organic carbon aerosols from natural sources. In contrast to other species, black carbon aerosols decrease global GPP by 0.28 (0.12) Pg C yr<superscript>-1</superscript> at all (clear) skies. Long-term simulations show that aerosol DFE is increasing 2.9% yr<superscript>-1</superscript> at all skies mainly because of a downward trend in cloud amount. This study suggests that the impacts of aerosols and cloud should be considered in projecting future changes of ecosystem productivity under varied emission scenarios. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16807367
- Database :
- Complementary Index
- Journal :
- Atmospheric Chemistry & Physics Discussions
- Publication Type :
- Academic Journal
- Accession number :
- 152532798
- Full Text :
- https://doi.org/10.5194/acp-2021-701