Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL074506 |
Effect of Snow Salinity on CryoSat-2 Arctic First-Year Sea Ice Freeboard Measurements | |
Nandan, Vishnu1; Geldsetzer, Torsten1; Yackel, John1; Mahmud, Mallik1; Scharien, Randall2; Howell, Stephen3; King, Joshua3; Ricker, Robert4,5; Else, Brent1 | |
2017-10-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:20 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Germany; France |
英文摘要 | The European Space Agency's CryoSat-2 satellite mission provides radar altimeter data that are used to derive estimates of sea ice thickness and volume. These data are crucial to understanding recent variability and changes in Arctic sea ice. Sea ice thickness retrievals at the CryoSat-2 frequency require accurate measurements of sea ice freeboard, assumed to be attainable when the main radar scattering horizon is at the snow/sea ice interface. Using an extensive snow thermophysical property dataset from late winter conditions in the Canadian Arctic, we examine the role of saline snow on first-year sea ice (FYI), with respect to its effect on the location of the main radar scattering horizon, its ability to decrease radar penetration depth, and its impact on FYI thickness estimates. Based on the dielectric properties of saline snow commonly found on FYI, we quantify the vertical shift in the main scattering horizon. This is found to be approximately 0.07 m. We propose a thickness-dependent snow salinity correction factor for FYI freeboard estimates. This significantly reduces CryoSat-2 FYI retrieval error. Relative error reductions of similar to 11% are found for an ice thickness of 0.95 m and similar to 25% for 0.7 m. Our method also helps to close the uncertainty gap between SMOS and CryoSat-2 thin ice thickness retrievals. Our results indicate that snow salinity should be considered for FYI freeboard estimates. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416761600040 |
WOS关键词 | C-BAND BACKSCATTER ; MICROWAVE BACKSCATTER ; THICKNESS ; COVER ; DEPTH ; ALGORITHM ; KU ; RETRIEVAL ; IMPACT |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26477 |
专题 | 气候变化 |
作者单位 | 1.Univ Calgary, Dept Geog, Cryosphere Climate Res Grp, Calgary, AB, Canada; 2.Univ Victoria, Dept Geog, Victoria, BC, Canada; 3.Environm & Climate Change Canada, Climate Res Div, Toronto, ON, Canada; 4.Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Bremerhaven, Germany; 5.Univ Brest, CNRS, IRD, IFREMER,LOPS,IUEM, Brest, France |
推荐引用方式 GB/T 7714 | Nandan, Vishnu,Geldsetzer, Torsten,Yackel, John,et al. Effect of Snow Salinity on CryoSat-2 Arctic First-Year Sea Ice Freeboard Measurements[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(20). |
APA | Nandan, Vishnu.,Geldsetzer, Torsten.,Yackel, John.,Mahmud, Mallik.,Scharien, Randall.,...&Else, Brent.(2017).Effect of Snow Salinity on CryoSat-2 Arctic First-Year Sea Ice Freeboard Measurements.GEOPHYSICAL RESEARCH LETTERS,44(20). |
MLA | Nandan, Vishnu,et al."Effect of Snow Salinity on CryoSat-2 Arctic First-Year Sea Ice Freeboard Measurements".GEOPHYSICAL RESEARCH LETTERS 44.20(2017). |
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