DOI: 10.5194/tc-14-1519-2020
论文题名: An enhancement to sea ice motion and age products at the National Snow and Ice Data Center (NSIDC)
作者: Tschudi M.A. ; Meier W.N. ; Scott Stewart J.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 5 起始页码: 1519
结束页码: 1536
语种: 英语
英文关键词: algorithm
; concentration (composition)
; ice cover
; NSCAT
; sea ice
; time series
; trend analysis
英文摘要: A new version of sea ice motion and age products includes several significant upgrades in processing, corrects known issues with the previous version, and updates the time series through 2018, with regular updates planned for the future. First, we provide a history of these NASA products distributed at the National Snow and Ice Data Center. Then we discuss the improvements to the algorithms, provide validation results for the new (Version 4) and older versions, and intercompare the two. While Version 4 algorithm changes were significant, the impact on the products is relatively minor, particularly for more recent years. The changes in Version 4 reduce motion biases by ~0.01 to 0.02 cm s-1 and error standard deviations by ~0.3 cm s-1. Overall, ice speed increased in Version 4 over Version 3 by 0.5 to 2.0 cm s-1 over most of the time series. Version 4 shows a higher positive trend for the Arctic of 0.21 cm s-1 per decade compared to 0.13 cm s-1 per decade for Version 3. The new version of ice age estimates indicates more older ice than Version 3, especially earlier in the record, but similar trends toward less multiyear ice. Changes in sea ice motion and age derived from the product show a significant shift in the Arctic ice cover, from a pack with a high concentration of older ice to a sea ice cover dominated by first-year ice, which is more susceptible to summer melt. We also observe an increase in the speed of the ice over the time series ≥30 years, which has been shown in other studies and is anticipated with the annual decrease in sea ice extent. © 2020 BMJ Publishing Group. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164604
Appears in Collections: 气候变化与战略
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作者单位: CCAR, Department of Aerospace Engineering Sciences, University of Colorado Boulder, UCB 431, Boulder, CO 80309, United States; National Snow and Ice Data Center, CIRES, University of Colorado Boulder, UCB 449, Boulder, CO 80309, United States
Recommended Citation:
Tschudi M.A.,Meier W.N.,Scott Stewart J.. An enhancement to sea ice motion and age products at the National Snow and Ice Data Center (NSIDC)[J]. Cryosphere,2020-01-01,14(5)