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DOI	10.5194/acp-22-2333-2022
	Biogeochemical and biophysical responses to episodes of wildfire smoke from natural ecosystems in southwestern British Columbia, Canada
	Lee, Sung-Ching; Knox, Sara H.; McKendry, Ian; Black, T. Andrew
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2333
结束页码	2349
卷号	22 期号:4 页码:17
英文摘要	Area burned, number of fires, seasonal fire severity, and fire season length are all expected to increase in Canada, with largely unquantified ecosystem feedbacks. However, there are few observational studies measuring ecosystem-scale biogeochemical (e.g., carbon dioxide exchanges) and biophysical (e.g., energy partitioning) properties during smoke episodes and hence assessing responses of gross primary production (GPP) to changes in incoming diffuse photosynthetically active radiation (PAR). In this study, we leveraged two long-term eddy covariance measurement sites in forest and wetland ecosystems to study four smoke episodes, which happened at different times and differed in length, over 4 different years (2015, 2017, 2018, and 2020). We found that the highest decrease in shortwave irradiance due to smoke was about 50 % in July and August but increased to about 90 % when the smoke arrived in September. When the smoke arrived in the later stage of summer, impacts on sensible and latent heat fluxes were very different than the earlier ones. Smoke generally increased the diffuse fraction (DF) from similar to 0.30 to similar to 0.50 and turned both sites into stronger carbon dioxide (CO2) sinks with increased GPP up to similar to 18 % and similar to 7 % at the forest and wetland site, respectively. However, when DF exceeded 0.80 as a result of dense smoke, both ecosystems became net CO2 sources as total PAR dropped to low values. The results suggest that this kind of natural experiment is important for validating future predictions of smoke-productivity feedbacks.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000760568700001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273210
作者单位	University of British Columbia; University of British Columbia
推荐引用方式 GB/T 7714	Lee, Sung-Ching,Knox, Sara H.,McKendry, Ian,et al. Biogeochemical and biophysical responses to episodes of wildfire smoke from natural ecosystems in southwestern British Columbia, Canada[J],2022,22(4):17.
APA	Lee, Sung-Ching,Knox, Sara H.,McKendry, Ian,&Black, T. Andrew.(2022).Biogeochemical and biophysical responses to episodes of wildfire smoke from natural ecosystems in southwestern British Columbia, Canada.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(4),17.
MLA	Lee, Sung-Ching,et al."Biogeochemical and biophysical responses to episodes of wildfire smoke from natural ecosystems in southwestern British Columbia, Canada".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.4(2022):17.