气候变化领域集成服务门户(CCPortal): Source and variability of formaldehyde (HCHO) at northern high latitudes: an integrated satellite, aircraft, and model study

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DOI	10.5194/acp-22-7163-2022
	Source and variability of formaldehyde (HCHO) at northern high latitudes: an integrated satellite, aircraft, and model study
	Zhao, Tianlang; Mao, Jingqiu; Simpson, William R.; De Smedt, Isabelle; Zhu, Lei; Hanisco, Thomas F.; Wolfe, Glenn M.; St Clair, Jason M.; Abad, Gonzalo Gonzalez; Nowlan, Caroline R.; Barletta, Barbara; Meinardi, Simone; Blake, Donald R.; Apel, Eric C.; Hornbrook, Rebecca S.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	7163
结束页码	7178
卷号	22 期号:11 页码:16
英文摘要	Here we use satellite observations of formaldehyde (HCHO) vertical column densities (VCD) from the TROPOspheric Monitoring Instrument (TROPOMI), aircraft measurements, combined with a nested regional chemical transport model (GEOS-Chem at 0.5 x 0.625 degrees resolution), to better understand the variability and sources of summertime HCHO in Alaska. We first evaluate GEOS -Chem with in-situ airborne measurements during the Atmospheric Tomography Mission 1 (ATom-1) aircraft campaign. We show reasonable agreement between observed and modeled HCHO, isoprene, monoterpenes and the sum of methyl vinyl ketone and methacrolein (MVK+MACR) in the continental boundary layer. In particular, HCHO profiles show spatial homogeneity in Alaska, suggesting a minor contribution of biogenic emissions to HCHO VCD. We further examine the TROPOMI HCHO product in Alaska in summer, reprocessed by GEOS-Chem model output for a priori profiles and shape factors. For years with low wildfire activity (e.g., 2018), we find that HCHO VCDs are largely dominated by background HCHO (58 %-71 %), with minor contributions from wildfires (20 %-32 %) and biogenic VOC emissions (8 %-10 %). For years with intense wildfires (e.g., 2019), summertime HCHO VCD is dominated by wildfire emissions (50 %-72 %), with minor contributions from background (22 %-41 %) and biogenic VOCs (6 %-10 %). In particular, the model indicates a major contribution of wildfires from direct emissions of HCHO, instead of secondary production of HCHO from oxidation of larger VOCs. We find that the column contributed by biogenic VOC is often small and below the TROPOMI detection limit, in part due to the slow HCHO production from isoprene oxidation under low NOx conditions. This work highlights challenges for quantifying HCHO and its precursors in remote pristine regions.
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:000805197400001
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/273301
作者单位	University of Alaska System; University of Alaska Fairbanks; University of Alaska System; University of Alaska Fairbanks; Southern University of Science & Technology; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; University System of Maryland; University of Maryland Baltimore County; Harvard University; Smithsonian Astrophysical Observatory; Smithsonian Institution; University of California System; University of California Irvine; National Center Atmospheric Research (NCAR) - USA
推荐引用方式 GB/T 7714	Zhao, Tianlang,Mao, Jingqiu,Simpson, William R.,et al. Source and variability of formaldehyde (HCHO) at northern high latitudes: an integrated satellite, aircraft, and model study[J],2022,22(11):16.
APA	Zhao, Tianlang.,Mao, Jingqiu.,Simpson, William R..,De Smedt, Isabelle.,Zhu, Lei.,...&Hornbrook, Rebecca S..(2022).Source and variability of formaldehyde (HCHO) at northern high latitudes: an integrated satellite, aircraft, and model study.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(11),16.
MLA	Zhao, Tianlang,et al."Source and variability of formaldehyde (HCHO) at northern high latitudes: an integrated satellite, aircraft, and model study".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.11(2022):16.