气候变化领域集成服务门户(CCPortal): Vertical profile observations of water vapor deuterium excess in the lower troposphere

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DOI	10.5194/acp-19-11525-2019
	Vertical profile observations of water vapor deuterium excess in the lower troposphere
	Salmon O.; Welp L.R.; Baldwin M.; Hajny K.; Stirm B.; Shepson P.
发表日期	2019
ISSN	16807316
起始页码	11525
结束页码	11543
卷号	19 期号:17
英文摘要	We use airborne measurements of water vapor (H2Ov) stable isotopologues and complementary meteorological observations to examine how boundary layer (BL) dynamics, cloud processing, and atmospheric mixing influence the vertical structure of-D,-18O, and deuterium excess (d excessD-D 8-18O) in the BL, inversion layer (INV), and lower free troposphere (FT). Flights were conducted around two continental US cities in February March 2016 and included vertical profiles extending from near the surface to-2 km. We examine observations from three unique case study flights in detail. One case study shows observations that are consistent with Rayleigh isotopic distillation theory coinciding with clear skies, dry adiabatic lapse rates within the boundary layer, and relatively constant vertical profiles of wind speed and wind direction. This suggests that the air mass retained the isotopic fingerprint of dehydration during moist adiabatic processes upwind of the study area. Also, observed d-excess values in the free troposphere were sometimes larger than Rayleigh theory predicts, which may indicate mixing of extremely dehydrated air from higher altitudes. The two remaining case studies show isotopic anomalies in the d-excess signature relative to Rayleigh theory and indicate cloud processes and complex boundary layer development. The most notable case study with stratocumulus clouds present had extremely low (negative) d-excess values at the interface of the inversion layer and the free troposphere, which is possibly indicative of cloud or rain droplet evaporation. We discuss how in situ H2Ov stable isotope measurements, and d excess in particular, could be useful for improving our understanding of water phase changes, transport, and mixing that occurs between the BL, INV, and FT. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric chemistry; boundary layer; deuterium; stable isotope; troposphere; vertical profile; water vapor
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/144156
作者单位	Department of Chemistry, Purdue University, 560 Oval Dr, West, Lafayette, IN 47907, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Dr, West Lafayette, IN 47907, United States; Purdue Climate Change Research Center, 203 S Martin Jischke Dr, West Lafayette, IN 47907, United States; School of Aviation and Transportation Technology, Purdue University, 1401 Aviation Dr, West Lafayette, IN 47907, United States; 101 S Webster St, Madison, WI 53703, United States; School of Marine and Atmospheric Sciences, Stony Brook University, 145 Endeavour Hall, Stony Brook, NY 11794, United States
推荐引用方式 GB/T 7714	Salmon O.,Welp L.R.,Baldwin M.,et al. Vertical profile observations of water vapor deuterium excess in the lower troposphere[J],2019,19(17).
APA	Salmon O.,Welp L.R.,Baldwin M.,Hajny K.,Stirm B.,&Shepson P..(2019).Vertical profile observations of water vapor deuterium excess in the lower troposphere.Atmospheric Chemistry and Physics,19(17).
MLA	Salmon O.,et al."Vertical profile observations of water vapor deuterium excess in the lower troposphere".Atmospheric Chemistry and Physics 19.17(2019).