干旱区生态环境知识资源中心(Arid): The magnitude and climate sensitivity of isotopic fractionation from ablation of Antarctic Dry Valley lakes

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DOI	10.1080/15230430.2021.2001899
	The magnitude and climate sensitivity of isotopic fractionation from ablation of Antarctic Dry Valley lakes
	Bellagamba, A. W.; Berkelhammer, M.; Winslow, L.; Doran, P. T.; Myers, K. F.; Devlin, S.; Hawes, I
通讯作者	Bellagamba, AW (corresponding author), Univ Illinois, Dept Earth & Environm Sci, 845 W Taylor St, Chicago, IL 60607 USA.
来源期刊	ARCTIC ANTARCTIC AND ALPINE RESEARCH
ISSN	1523-0430
EISSN	1938-4246
出版年	2021
卷号	53 期号:1 页码:352-371
英文摘要	There has been extensive research on the effects of evaporation on the isotopic ratio of lacustrine and marine water bodies; however, there are limited data on how ablation or sublimation from lake or sea ice influences the isotopic ratio of the residual water body. This is a challenging problem because there remains uncertainty on the magnitude of fractionation during sublimation and because ablation can involve mixed-phase processes associated with simultaneous sublimation, melting, evaporation, and refreezing. This uncertainty limits the ability to draw quantitative inferences on changing hydrological budgets from stable isotope records in arctic, Antarctic, and alpine lakes. Here, we use in situ measurements of the isotopic ratio of water vapor along with the gradient diffusion method to constrain the isotopic ratio of the ablating ice from two lakes in the McMurdo Dry Valleys, Antarctica. We find that during austral summer, the isotopic fractionation of ablation was insignificant during periods of boundary layer instability that are typical during midday when latent heat is highest. This implies that the loss of mass during these periods did not yield any isotopic enrichment to the residual lake mass. However, fractionation increased after midday when the boundary layer stabilized and the latent heat flux was small. This diurnal pattern was mirrored on synoptic timescales, when following warm and stable conditions latent heat flux was low and dominated by higher fractionation for a few days. We hypothesize that the shifting from negligible to large isotopic fractionation reflects the development and subsequent exhaustion of liquid water on the surface. The results illustrate the complex and nonlinear controls on isotopic fractionation from icy lakes, which implies that the isotopic enrichment from ablation could vary significantly over timescales relevant for changing lake volumes. Future work using water isotope fluxes for longer periods of time and over additional perennial and seasonal ice-covered lake systems is critical for developing models of the isotopic mass balance of arctic and Antarctic lake systems.
英文关键词	Dry Valley lakes stable water isotopes isotope fractionation
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000732460900001
WOS关键词	ATMOSPHERIC WATER-VAPOR ; STABLE-ISOTOPE ; POLAR DESERT ; ICE ; OXYGEN ; HYDROGEN ; SUBLIMATION ; BALANCE ; STATION ; EVENTS
WOS类目	Environmental Sciences ; Geography, Physical
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373595
作者单位	[Bellagamba, A. W.; Berkelhammer, M.] Univ Illinois, Dept Earth & Environm Sci, 845 W Taylor St, Chicago, IL 60607 USA; [Winslow, L.] Rensselaer Polytech Inst, Dept Biol Sci, Troy, NY USA; [Doran, P. T.; Myers, K. F.] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA; [Devlin, S.] Univ Montana, Flathead Lake Biol Stn, Polson, MT 59860 USA; [Hawes, I] Univ Waikato, Environm Res Inst, Tauranga, New Zealand
推荐引用方式 GB/T 7714	Bellagamba, A. W.,Berkelhammer, M.,Winslow, L.,et al. The magnitude and climate sensitivity of isotopic fractionation from ablation of Antarctic Dry Valley lakes[J],2021,53(1):352-371.
APA	Bellagamba, A. W..,Berkelhammer, M..,Winslow, L..,Doran, P. T..,Myers, K. F..,...&Hawes, I.(2021).The magnitude and climate sensitivity of isotopic fractionation from ablation of Antarctic Dry Valley lakes.ARCTIC ANTARCTIC AND ALPINE RESEARCH,53(1),352-371.
MLA	Bellagamba, A. W.,et al."The magnitude and climate sensitivity of isotopic fractionation from ablation of Antarctic Dry Valley lakes".ARCTIC ANTARCTIC AND ALPINE RESEARCH 53.1(2021):352-371.