Effects of increasing aerosol optical depth on the gross primary productivity in China during 2000–2014

Zhang, Jing; Ding, Juhua; Zhang, Jiang; Yuan, Minshu; Xiao, Zhongyong; Peng, Changhui; Chen, Huai; Wang, Meng; Zhu, Qiuan

doi:10.1016/j.ecolind.2019.105761

Cited by 24 publications

(17 citation statements)

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“…Global extrapolation of the diffuse fertilization effect is challenged by these kinds of episodic, regional events and requires more continuous observational data over a range of conditions. Site-level observed sensitivities, like those presented here, may be useful for global modeling in smoke and aerosol-loaded regions, especially in rapidly growing economies with air pollution challenges (Zhang et al, 2020). Our study focuses on ecosystem-integrated productivity and does not address the question of crop yield, which may not respond to diffuse fraction the same way as overall ecosystem productivity.…”

Section: 1029/2019jg005380mentioning

confidence: 99%

Wildfire‐Smoke Aerosols Lead to Increased Light Use Efficiency Among Agricultural and Restored Wetland Land Uses in California's Central Valley

2020

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There are few observational studies measuring the ecosystem‐scale productivity effects of changes in incident diffuse photosynthetically active radiation (PARdiffuse), especially related to wildfire smoke. Climate change‐induced increases to the duration and intensity of fire conditions have made smoke a common occurrence across western North America, with largely unquantified ecosystem feedbacks. Under equivalent amounts of radiation, increased atmospheric particulate matter could lead to a boost in productivity as scattering redistributes photons throughout multilayer canopies. In this work, we leverage a meso‐network of eddy covariance measurement sites across a unique array of managed and restored C3 and C4 canopy types to understand how recent wildfire smoke affected ecosystem productivity during the summer of 2018, an especially smoky year in the agriculturally productive Central Valley. We find that diffuse PARdiffuse increased by more than a third compared to the previous growing season, while total PAR was only slightly diminished. These conditions caused nearly a doubling of light use efficiency over the range of diffuse fraction observed, with the highest sensitivity to diffuse fraction exhibited by corn and alfalfa crops. We utilized an empirical model to assess the trade‐off between enhanced diffuse fraction and reduced total PAR. Under mean radiation conditions, daily integrated gross ecosystem productivity increased by 1.2–4.2% compared to the previous growing season. Finally, we explore the potential negative effect of heightened ozone, a copollutant often associated with wildfire. In addition to the effects of wildfire smoke, the results of this natural experiment can help validate future predictions of aerosol‐productivity feedbacks.

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Section: 1029/2019jg005380mentioning

confidence: 99%

Wildfire‐Smoke Aerosols Lead to Increased Light Use Efficiency Among Agricultural and Restored Wetland Land Uses in California's Central Valley

2020

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“…To investigate the effects of aerosols on diffuse radiation, the diffuse radiation fraction was calculated as follows [27]:…”

Section: Diffuse Radiation Fractionmentioning

confidence: 99%

“…The atmosphere gradually recovered after 1994 [22]. Zhang et al [27] studied the effects of aerosols on radiation by using medium resolution imaging spectrometer products and obtained meteorological data in China from 2000 to 2014. They found that the AOD positively influenced the diffuse radiation and diffuse fraction, and that increasing the diffuse radiation promoted the gross primary productivity of forests.…”

Section: Plos Onementioning

confidence: 99%

Long-term variations in solar radiation, diffuse radiation, and diffuse radiation fraction caused by aerosols in China during 1961–2016

et al. 2021

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The effects of atmospheric aerosols on the terrestrial climate system are more regional than those of greenhouse gases, which are more global. Thus, it is necessary to examine the typical regional effects of how aerosols affect solar radiation in order to develop a more comprehensive understanding. In this study, we used global AErosol RObotic NETwork (AERONET) data and robust radiation observational evidence to investigate the impact of aerosols on total radiation, diffuse radiation, and the diffuse radiation fraction in China from 1961 to 2016. Our results showed that there were different temporal changes in the aerosol optical depth (AOD), total solar radiation, diffuse radiation and diffuse radiation fraction over the past 56 years. Specifically, the 550 nm AOD from 2005 to 2016 decreased significantly, with annual average AOD of 0.51. Meanwhile, the average total solar radiation reduced by 2.48%, while there was a slight increase in average diffuse radiation at a rate of 3.10 MJ·m-2·yr-1. Moreover, the spatial heterogeneities of AOD, total radiation, diffuse radiation, and the diffuse radiation fraction in China were significant. Aerosol particle emissions in the developed eastern and southern regions of China were more severe than those in the western regions, resulting in higher total radiation and diffuse radiation in the western plateau than in the eastern plain. In addition, aerosols were found to have negative effects on total radiation and sunshine hours, and positive effects on diffuse radiation and diffuse radiation fraction. Further, the diffuse radiation fraction was negatively correlated with sunshine hours. However, there was a positive correlation between AOD and sunshine hours. These results could be used to assess the impacts of climate change on terrestrial ecosystem productivity and carbon budgets.

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“…The putative driving factors of large-scale variability in GPP are determined by location and biome type. For example, AOD is positively correlated with GPP in forests but negatively correlated with GPP in grasslands over China [27]. Furthermore, although the sensitivity of GPP to LCC is positive at a global scale, a negative effect is observed in the rainforests of South America and Eurasia [25].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to studies of GPP variability, the attribution of GPP anomalies has recently gained significant attention. Several putative drivers have been attributed to GPP changes including surface air temperature (Ts) [22], precipitation (Pt) [23,24], atmospheric carbon dioxide (CO2) concentrations [25,26], aerosol optical depth (AOD) [27], plant phenology and physiology [28], and land-cover change (LCC) [25]. Generally, increases in atmospheric CO2 concentrations dominate GPP changes via CO2 fertilization effects; the Ts and Pt produce similar but lowermagnitude positive GPP effects; solar radiation (Rs) is associated with an overall decrease in GPP; and LCC is positively correlated with GPP [25].…”

Section: Introductionmentioning

confidence: 99%

Distribution and Attribution of Gross Primary Productivity Increase Over the Mongolian Plateau, 2001-2018

2022

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Gross primary productivity (GPP) over the Mongolian Plateau (MP) is a vital component of the global terrestrial carbon cycle. Using the latest satellite-based GPP estimates at the best achievable spatial resolution along with several ancillary datasets, we investigated GPP variations in the MP region during 2001-2018 and attributed these changes to land-surface temperature (Ts), total precipitation (Pt), land-cover change (LCC), and atmospheric carbon dioxide (CO2) concentrations. The 18-year-averaged annual cumulative GPP in the MP region was 357.02 ± 24.76 gC m -2 yr -1 during the study period, ranging from 60.51 ± 6.10 gC m -2 yr -1 in deserts to 596.41 ± 35.49 gC m -2 yr -1 in forests. A linear regression analysis indicated a significant overall increase in GPP, at a rate of 3.91 gC m -2 yr -1 (p < 0.01). In comparison, GPP increased at a rate of 0.79 gC m -2 yr -1 in deserts (p < 0.01), 4.79 gC m -2 yr -1 in forests (p < 0.01), and 5.76 gC m -2 yr -1 in grasslands (p < 0.01). Our detailed attribution analysis indicates that GPP is positively sensitive to surface air temperature (0.15 gC °C-1 ) and total precipitation (0.25 gC mm -1 ) but negatively sensitive to atmospheric CO2 concentrations (-0.20 gC mol -1 ) and LCC (-0.93 gC class -1 ). Furthermore, we reported large differences in the spatial patterns and magnitudes among individual variables in the GPP attribution analysis, with LCC proving to be the dominant factor followed by CO2 fertilization effects; climatic factors had comparatively little influence on GPP variations during the study period. Overall, the findings of this study contribute to our understanding of the responses of sensitive ecosystems to the competing effects of climate change and human disturbance at regional scales.

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Effects of increasing aerosol optical depth on the gross primary productivity in China during 2000–2014

Cited by 24 publications

References 50 publications

Wildfire‐Smoke Aerosols Lead to Increased Light Use Efficiency Among Agricultural and Restored Wetland Land Uses in California's Central Valley

Wildfire‐Smoke Aerosols Lead to Increased Light Use Efficiency Among Agricultural and Restored Wetland Land Uses in California's Central Valley

Long-term variations in solar radiation, diffuse radiation, and diffuse radiation fraction caused by aerosols in China during 1961–2016

Distribution and Attribution of Gross Primary Productivity Increase Over the Mongolian Plateau, 2001-2018

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