气候变化领域集成服务门户(CCPortal): Comparison of a coupled snow thermodynamic and radiative transfer model with in situ active microwave signatures of snow-covered smooth first-year sea ice

CCPortal

DOI	10.5194/tc-9-2149-2015
	Comparison of a coupled snow thermodynamic and radiative transfer model with in situ active microwave signatures of snow-covered smooth first-year sea ice
	Fuller M.C.; Geldsetzer T.; Yackel J.; Gill J.P.S.
发表日期	2015
ISSN	19940416
卷号	9 期号:6
英文摘要	Within the context of developing data inversion and assimilation techniques for C-band backscatter over sea ice, snow physical models may be used to drive backscatter models for comparison and optimization with satellite observations. Such modeling has the potential to enhance understanding of snow on sea-ice properties required for unambiguous interpretation of active microwave imagery. An end-to-end modeling suite is introduced, incorporating regional reanalysis data (NARR), a snow model (SNTHERM89.rev4), and a multilayer snow and ice active microwave backscatter model (MSIB). This modeling suite is assessed against measured snow on sea-ice geophysical properties and against measured active microwave backscatter. NARR data were input to the SNTHERM snow thermodynamic model in order to drive the MSIB model for comparison to detailed geophysical measurements and surface-based observations of C-band backscatter of snow on first-year sea ice. The NARR variables were correlated to available in situ measurements with the exception of long-wave incoming radiation and relative humidity, which impacted SNTHERM simulations of snow temperature. SNTHERM snow grain size and density were comparable to observations. The first assessment of the forward assimilation technique developed in this work required the application of in situ salinity profiles to one SNTHERM snow profile, which resulted in simulated backscatter close to that driven by in situ snow properties. In other test cases, the simulated backscatter remained 4-6 dB below observed for higher incidence angles and when compared to an average simulated backscatter of in situ end-member snow covers. Development of C-band inversion and assimilation schemes employing SNTHERM89.rev4 should consider sensitivity of the model to bias in incoming long-wave radiation, the effects of brine, and the inability of SNTHERM89.Rev4 to simulate water accumulation and refreezing at the bottom and mid-layers of the snowpack. These impact thermodynamic response, brine wicking and volume processes, snow dielectrics, and thus microwave backscatter from snow on first-year sea ice. © 2015 Author(s).
学科领域	backscatter; longwave radiation; microwave imagery; radiative transfer; relative humidity; satellite imagery; sea ice; snow cover; snowpack; thermodynamic property
语种	英语
scopus关键词	backscatter; longwave radiation; microwave imagery; radiative transfer; relative humidity; satellite imagery; sea ice; snow cover; snowpack; thermodynamic property
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/119781
作者单位	Cryosphere Climate Research Group, University of Calgary, Calgary, Canada
推荐引用方式 GB/T 7714	Fuller M.C.,Geldsetzer T.,Yackel J.,et al. Comparison of a coupled snow thermodynamic and radiative transfer model with in situ active microwave signatures of snow-covered smooth first-year sea ice[J],2015,9(6).
APA	Fuller M.C.,Geldsetzer T.,Yackel J.,&Gill J.P.S..(2015).Comparison of a coupled snow thermodynamic and radiative transfer model with in situ active microwave signatures of snow-covered smooth first-year sea ice.Cryosphere,9(6).
MLA	Fuller M.C.,et al."Comparison of a coupled snow thermodynamic and radiative transfer model with in situ active microwave signatures of snow-covered smooth first-year sea ice".Cryosphere 9.6(2015).