气候变化领域集成服务门户(CCPortal): Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model

CCPortal

DOI	10.5194/tc-8-417-2014
	Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model
	Carmagnola C.M.; Morin S.; Lafaysse M.; Domine F.; Lesaffre B.; Lejeune Y.; Picard G.; Arnaud L.
发表日期	2014
ISSN	19940416
卷号	8 期号:2
英文摘要	In the SURFEX/ISBA-Crocus multi-layer snowpack model, the snow microstructure has up to now been characterised by the grain size and by semi-empirical shape variables which cannot be measured easily in the field or linked to other relevant snow properties. In this work we introduce a new formulation of snow metamorphism directly based on equations describing the rate of change of the optical diameter (dopt). This variable is considered here to be equal to the equivalent sphere optical diameter, which is inversely proportional to the specific surface area (SSA). dopt thus represents quantitatively some of the geometric characteristics of a porous medium. Different prognostic rate equations of dopt, including a re-formulation of the original Crocus scheme and the parameterisations from Taillandier et al. (2007) and Flanner and Zender (2006), were evaluated by comparing their predictions to field measurements carried out at Summit Camp (Greenland) in May and June 2011 and at Col de Porte (French Alps) during the 2009/10 and 2011/12 winter seasons. We focused especially on results in terms of SSA. In addition, we tested the impact of the different formulations on the simulated density profile, the total snow height, the snow water equivalent (SWE) and the surface albedo. Results indicate that all formulations perform well, with median values of the RMSD between measured and simulated SSA lower than 10 m2 kgg'1. Incorporating the optical diameter as a fully fledged prognostic variable is an important step forward in the quantitative description of the snow microstructure within snowpack models, because it opens the way to data assimilation of various electromagnetic observations. © Author(s) 2014.
学科领域	albedo; microstructure; porous medium; seasonal variation; simulation; snowpack; surface area; Crocus
语种	英语
scopus关键词	albedo; microstructure; porous medium; seasonal variation; simulation; snowpack; surface area; Crocus
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120143
作者单位	Météo France Andndash; CNRS, GAME UMR3589, Centre d'Études de la Neige, Grenoble, France; Takuvik Joint International Laboratory, CNRS, Université Laval, Québec, QC, Canada; CNRS, UJF Grenoble, LGGE, Grenoble, France
推荐引用方式 GB/T 7714	Carmagnola C.M.,Morin S.,Lafaysse M.,et al. Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model[J],2014,8(2).
APA	Carmagnola C.M..,Morin S..,Lafaysse M..,Domine F..,Lesaffre B..,...&Arnaud L..(2014).Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model.Cryosphere,8(2).
MLA	Carmagnola C.M.,et al."Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model".Cryosphere 8.2(2014).