气候变化领域集成服务门户(CCPortal): Satellite-derived constraints on the effect of drought stress on biogenic isoprene emissions in the southeastern US

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DOI	10.5194/acp-22-14189-2022
	Satellite-derived constraints on the effect of drought stress on biogenic isoprene emissions in the southeastern US
	Wang, Yuxuan; Lin, Nan; Li, Wei; Guenther, Alex; Lam, Joey C. Y.; Tai, Amos P. K.; Potosnak, Mark J.; Seco, Roger
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	14189
结束页码	14208
卷号	22 期号:21 页码:20
英文摘要	While substantial progress has been made to improve our understanding of biogenic isoprene emissions under unstressed conditions, large uncertainties remain with respect to isoprene emissions under stressed conditions. Here, we use the US Drought Monitor (USDM) as a weekly drought severity index and tropospheric columns of formaldehyde (HCHO), the key product of isoprene oxidation, retrieved from the Ozone Monitoring Instrument (OMI) to derive top-down constraints on the response of summertime isoprene emissions to drought stress in the southeastern United States (SE US), a region of high isoprene emissions that is also prone to drought. OMI HCHO column density is found to be 6.7 % (mild drought) to 23.3 % (severe drought) higher than that under non-drought conditions. A global chemical transport model, GEOS-Chem, with version 2.1 of the Model of Emissions of Gases and Aerosols from Nature (MEGAN2.1) emission algorithm can simulate this direction of change, but the simulated increases at the corresponding drought levels are 1.1-1.5 times that of OMI HCHO, suggesting the need for a drought-stress algorithm in the model. By minimizing the model-OMI differences in HCHO to temperature sensitivity under different drought levels, we derived a top-down drought stress factor (gamma(d_OMI)) in GEOS-Chem that parameterizes using water stress and temperature. The algorithm led to an 8.6 % (mild drought) to 20.7 % (severe drought) reduction in isoprene emissions in the SE US relative to the simulation without it. With gamma(d_OMI) the model predicts a nonlinear increasing trend in isoprene emissions with drought severity that is consistent with OMI HCHO and a single site's isoprene flux measurements. Compared with a previous drought stress algorithm derived from the latter, the satellite-based drought stress factor performs better with respect to capturing the regional-scale drought-isoprene responses, as indicated by the near-zero mean bias between OMI and simulated HCHO columns under different drought conditions. The drought stress algorithm also reduces the model's high bias in organic aerosol (OA) simulations by 6.60 % (mild drought) to 11.71 % (severe drought) over the SE US compared to the no-stress simulation. The simulated ozone response to the drought stress factor displays a spatial disparity due to the isoprene-suppressing effect on oxidants, with an <1 ppb increase in O-3 in high-isoprene regions and a 1-3 ppbv decrease in O-3 in low-isoprene regions. This study demonstrates the unique value of exploiting long-term satellite observations to develop empirical stress algorithms on biogenic emissions where in situ flux measurements are limited.
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:000879457900001
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/273143
作者单位	University of Houston System; University of Houston; University of California System; University of California Irvine; Chinese University of Hong Kong; Chinese University of Hong Kong; Chinese University of Hong Kong; DePaul University; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Centro de Investigacion y Desarrollo Pascual Vila (CID-CSIC); CSIC - Instituto de Diagnostico Ambiental y Estudios del Agua (IDAEA)
推荐引用方式 GB/T 7714	Wang, Yuxuan,Lin, Nan,Li, Wei,et al. Satellite-derived constraints on the effect of drought stress on biogenic isoprene emissions in the southeastern US[J],2022,22(21):20.
APA	Wang, Yuxuan.,Lin, Nan.,Li, Wei.,Guenther, Alex.,Lam, Joey C. Y..,...&Seco, Roger.(2022).Satellite-derived constraints on the effect of drought stress on biogenic isoprene emissions in the southeastern US.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(21),20.
MLA	Wang, Yuxuan,et al."Satellite-derived constraints on the effect of drought stress on biogenic isoprene emissions in the southeastern US".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.21(2022):20.