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Title: Enhanced water use efficiency in global terrestrial ecosystems under increasing aerosol loadings

Abstract

Aerosols play a crucial role in the climate system, affecting incoming radiation and cloud formation. Based on a modelling framework that couples ecosystem processes with the atmospheric transfer of radiation, we analyze the effect of aerosols on surface incoming radiation, gross primary productivity (GPP), water losses from ecosystems through evapotranspiration (ET) and ecosystem water use efficiency (WUE, defined as GPP/ET) for 2003–2010 and validate them at global FLUXNET sites. The total diffuse radiation increases under relatively low or intermediate aerosol loadings, but decreases under more polluted conditions. We find that aerosol-induced changes in GPP depend on leaf area index, aerosol loading and cloudiness. Specifically, low and moderate aerosol loadings cause increases in GPP for all plant types, while heavy aerosol loadings result in enhancement (decrease) in GPP for dense (sparse) vegetation. On the other hand, ET is mainly negatively affected by aerosol loadings due to the reduction in total incoming radiation. Finally, WUE shows a consistent rise in all plant types under increasing aerosol loadings. Overall, the simulated daily WUE compares well with observations at 43 eddy-covariance tower sites (R 2=0.84 and RMSE=0.01gC (kg H 2O) -1) with better performance at forest sites. In addition to the increasing portions ofmore » diffuse light, the rise in WUE is also favored by the reduction in radiation- and heat-stress caused by the aerosols, especially for wet and hot climates.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1368118
Report Number(s):
PNNL-SA-126321
Journal ID: ISSN 0168-1923
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Agricultural and Forest Meteorology; Journal Volume: 237-238; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Lu, Xiaoliang, Chen, Min, Liu, Yaling, Miralles, Diego G., and Wang, Faming. Enhanced water use efficiency in global terrestrial ecosystems under increasing aerosol loadings. United States: N. p., 2017. Web. doi:10.1016/j.agrformet.2017.02.002.
Lu, Xiaoliang, Chen, Min, Liu, Yaling, Miralles, Diego G., & Wang, Faming. Enhanced water use efficiency in global terrestrial ecosystems under increasing aerosol loadings. United States. doi:10.1016/j.agrformet.2017.02.002.
Lu, Xiaoliang, Chen, Min, Liu, Yaling, Miralles, Diego G., and Wang, Faming. Mon . "Enhanced water use efficiency in global terrestrial ecosystems under increasing aerosol loadings". United States. doi:10.1016/j.agrformet.2017.02.002.
@article{osti_1368118,
title = {Enhanced water use efficiency in global terrestrial ecosystems under increasing aerosol loadings},
author = {Lu, Xiaoliang and Chen, Min and Liu, Yaling and Miralles, Diego G. and Wang, Faming},
abstractNote = {Aerosols play a crucial role in the climate system, affecting incoming radiation and cloud formation. Based on a modelling framework that couples ecosystem processes with the atmospheric transfer of radiation, we analyze the effect of aerosols on surface incoming radiation, gross primary productivity (GPP), water losses from ecosystems through evapotranspiration (ET) and ecosystem water use efficiency (WUE, defined as GPP/ET) for 2003–2010 and validate them at global FLUXNET sites. The total diffuse radiation increases under relatively low or intermediate aerosol loadings, but decreases under more polluted conditions. We find that aerosol-induced changes in GPP depend on leaf area index, aerosol loading and cloudiness. Specifically, low and moderate aerosol loadings cause increases in GPP for all plant types, while heavy aerosol loadings result in enhancement (decrease) in GPP for dense (sparse) vegetation. On the other hand, ET is mainly negatively affected by aerosol loadings due to the reduction in total incoming radiation. Finally, WUE shows a consistent rise in all plant types under increasing aerosol loadings. Overall, the simulated daily WUE compares well with observations at 43 eddy-covariance tower sites (R2=0.84 and RMSE=0.01gC (kg H2O)-1) with better performance at forest sites. In addition to the increasing portions of diffuse light, the rise in WUE is also favored by the reduction in radiation- and heat-stress caused by the aerosols, especially for wet and hot climates.},
doi = {10.1016/j.agrformet.2017.02.002},
journal = {Agricultural and Forest Meteorology},
number = C,
volume = 237-238,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}