DOI: 10.5194/tc-11-47-2017
Scopus记录号: 2-s2.0-85009488912
论文题名: Satellite microwave assessment of Northern Hemisphere lake ice phenology from 2002 to 2015
作者: Du J ; , Kimball J ; S ; , Duguay C ; , Kim Y ; , Watts J ; D
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 1 起始页码: 47
结束页码: 63
语种: 英语
英文关键词: algorithm
; AMSR-E
; brightness temperature
; EOS
; global change
; ground-based measurement
; ice cover
; lacustrine environment
; pixel
; satellite data
; Canada
英文摘要: A new automated method enabling consistent satellite assessment of seasonal lake ice phenology at 5km resolution was developed for all lake pixels (water coverage ≥ 90%) in the Northern Hemisphere using 36.5GHz H-polarized brightness temperature (Tb) observations from the Advanced Microwave Scanning Radiometer for EOS and Advanced Microwave Scanning Radiometer 2 (AMSR-E/2) sensors. The lake phenology metrics include seasonal timing and duration of annual ice cover. A moving t test (MTT) algorithm allows for automated lake ice retrievals with daily temporal fidelity and 5km resolution gridding. The resulting ice phenology record shows strong agreement with available ground-based observations from the Global Lake and River Ice Phenology Database (95.4% temporal agreement) and favorable correlations (R) with alternative ice phenology records from the Interactive Multisensor Snow and Ice Mapping System (R Combining double low line 0.84 for water clear of ice (WCI) dates; R Combining double low line 0.41 for complete freeze over (CFO) dates) and Canadian Ice Service (R Combining double low line 0.86 for WCI dates; R Combining double low line 0.69 for CFO dates). Analysis of the resulting 12-year (2002-2015) AMSR-E/2 ice record indicates increasingly shorter ice cover duration for 43 out of 71 (60.6%) Northern Hemisphere lakes examined, with significant (p < 0.05) regional trends toward earlier ice melting for only five lakes. Higher-latitude lakes reveal more widespread and larger trends toward shorter ice cover duration than lower-latitude lakes, consistent with enhanced polar warming. This study documents a new satellite-based approach for rapid assessment and regional monitoring of seasonal ice cover changes over large lakes, with resulting accuracy suitable for global change studies. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75624
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Numerical Terradynamic Simulation Group, College of Forestry and Conservation, University of Montana, Missoula, MT, United States; Department of Geography and Environmental Management, Interdisciplinary Centre on Climate Change, University of Waterloo, Waterloo, ON, Canada
Recommended Citation:
Du J,, Kimball J,S,et al. Satellite microwave assessment of Northern Hemisphere lake ice phenology from 2002 to 2015[J]. Cryosphere,2017-01-01,11(1)