气候变化领域集成服务门户(CCPortal): Observations of Greenhouse Gas Changes Across Summer Frontal Boundaries in the Eastern United States

CCPortal

DOI	10.1029/2019JD030526
	Observations of Greenhouse Gas Changes Across Summer Frontal Boundaries in the Eastern United States
	Pal S.; Davis K.J.; Lauvaux T.; Browell E.V.; Gaudet B.J.; Stauffer D.R.; Obland M.D.; Choi Y.; DiGangi J.P.; Feng S.; Lin B.; Miles N.L.; Pauly R.M.; Richardson S.J.; Zhang F.
发表日期	2020
ISSN	2169897X
卷号	125 期号:5
英文摘要	Our knowledge about synoptic-scale variations of atmospheric-CO2 produced by interactions between midlatitude cyclones and regional-scale surface fluxes remains limited due to the scarcity of observations. We synthesized observations of greenhouse gases (GHGs) with respect to frontal passages to understand how GHG distributions change vertically and horizontally during a synoptic event. We use the airborne in situ measurements of GHGs collected during the Atmospheric Carbon and Transport-America summer 2016 field campaign. Using these measurements, we defined three metrics, (1) the differences in the GHG mole fractions across frontal boundaries in the atmospheric boundary layer (BL) and free troposphere (FT), (2) differences in the vertical contrasts in GHGs in warm and cold sectors, and (3) the size and magnitude of enhanced CO2 in the vicinity of frontal boundary. We found that frontal structures are clearly associated with spatially coherent and significant changes in GHG composition. Warm sector CO2 mole fractions [CO2] are higher than those in the cold sector. The cross-frontal [CO2] contrasts are largest in the BL (5–30 ppm) with smaller differences in the FT (3–5 ppm). We found higher [CH4] in the BL in the warm sector than in the cold sector for 5 out of 11 cases. Analyses of vertical profiles revealed higher [CO2] in the FT than in the BL in the cold sector while opposite pattern in the warm sector. Average BL-to-FT [CO2] differences are 12 and −6 ppm in the warm and cold sectors, respectively. The observational analyses presented define new metrics involving horizontal and vertical GHG contrasts across fronts during summer which will be used to evaluate simulations of GHG transport. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	airborne atmospheric measurements; atmospheric boundary layer; cold front; free troposphere; greenhouse gases; midlatitude cyclone
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186144
作者单位	Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, United States; Department of Geosciences, Atmospheric Science Division, Texas Tech University, Lubbock, TX, United States; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States; NASA Langley Research Center, Hampton, VA, United States; Pacific Northwest National Laboratory, Richland, WA, United States; Science Systems and Applications Inc., Lanham, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Pal S.,Davis K.J.,Lauvaux T.,et al. Observations of Greenhouse Gas Changes Across Summer Frontal Boundaries in the Eastern United States[J],2020,125(5).
APA	Pal S..,Davis K.J..,Lauvaux T..,Browell E.V..,Gaudet B.J..,...&Zhang F..(2020).Observations of Greenhouse Gas Changes Across Summer Frontal Boundaries in the Eastern United States.Journal of Geophysical Research: Atmospheres,125(5).
MLA	Pal S.,et al."Observations of Greenhouse Gas Changes Across Summer Frontal Boundaries in the Eastern United States".Journal of Geophysical Research: Atmospheres 125.5(2020).