Influence of aerosol dry deposition on photosynthetically active radiation available to plants: A case study in the Yangtze delta region of China

TitleInfluence of aerosol dry deposition on photosynthetically active radiation available to plants: A case study in the Yangtze delta region of China
Publication TypeJournal Article
Year of Publication2001
AuthorsMH Bergin, R Greenwald, J Xu, Y Berta, and WL Chameides
JournalGeophysical Research Letters
Volume28
Start Page3605
Issue18
Pagination3605 - 3608
Date Published09/2001
Abstract

In this paper, a new mechanism is proposed by which aerosols decrease the amount of photosynthetically active radiation (PAR) available to plants for photosynthesis. The mechanism involves the scattering and absorption of PAR by water insoluble aerosol particles (WIA) which deposit on leaves and are not washed off by precipitation. A simple model is developed that predicts the change in the transmittance of PAR, T PAR, for plant leaves due to WIA dry deposition as a function of aerosol chemical, physical, and optical properties. Model estimates for the agricultural Yangtze delta region of China indicate that over a 2-month period during a growing season, dry deposition of WIA may account for a ~35% reduction in PAR available for plant photosynthesis. Although, the estimate is sensitive to several factors that are uncertain including aerosol dry deposition velocity, leaf area index, and removal rate of particles by precipitation. Results suggest that impacts on crop yields due to aerosol dry deposition could be considerable in this region and suggest a previously neglected economic incentive for China to mitigate air pollution. Additionally, WIA dry deposition may influence carbon uptake by plants in other locations that experience regional haze.

DOI10.1029/2001GL013461
Short TitleGeophysical Research Letters