气候变化领域集成服务门户(CCPortal): Regional influence of ocean-atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada

CCPortal

DOI	10.5194/tc-13-2693-2019
	Regional influence of ocean-atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada
	Bevington A.R.; Gleason H.E.; Foord V.N.; Floyd W.C.; Griesbauer H.P.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2693
结束页码	2712
卷号	13 期号:10
英文摘要	We use the twice-daily Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover product to study the regional influence of the Oceanic Niño Index (ONI) and Pacific Decadal Oscillation (PDO) on snow cover in British Columbia (BC). We apply a locally weighted regression (LOWESS) interpolation to the MODIS normalized difference snow index (NDSI) time series to detect the timing and duration of snow. We confirm the general consensus from many previous in situ studies that both ONI and PDO have significant impacts on snow cover in BC. We add to this knowledge by performing seasonal and regional analysis using established hydrozones and explore variation in our results by elevation bins of 500m. We calibrated our method with in situ snow water equivalent (SWE) data and found an optimal NDSI threshold of 30 for detecting continuous snow cover. We separate automatic snow weather station data into calibration (75%) and validation (25%) subsets and obtain mean absolute errors between the MODIS and in situ observations for the start, end, and duration of 8.7, 8.9, and 13.1d for the calibration data and 12.7, 12.6, and 16.6d for the validation data, respectively. In general, the start date of snow is poorly correlated with both ONI and PDO, whereas the end date and duration are strongly negatively correlated. Regional patterns emerge wherein northern and southern BC are most correlated with the PDO and the ONI, respectively. These relationships are generally stronger at lower elevations and vary spatially. This study demonstrates that the suitability of ocean-atmosphere teleconnections as predictors of the timing and duration of snow varies throughout BC. © 2019 American Institute of Physics Inc.. All rights reserved.
学科领域	air-sea interaction; calibration; hydrographic survey; MODIS; Pacific Decadal Oscillation; satellite altimetry; seasonality; snow cover; teleconnection; British Columbia; Canada
语种	英语
scopus关键词	air-sea interaction; calibration; hydrographic survey; MODIS; Pacific Decadal Oscillation; satellite altimetry; seasonality; snow cover; teleconnection; British Columbia; Canada
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118824
作者单位	British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development, Prince George, V2L 1R5, Canada; Natural Resources and Environmental Studies Institute and Geography Program, University of Northern British Columbia, Prince George, V2N 4Z9, Canada; British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development, Nanaimo, V9T 6E9, Canada; Faculty of Geography, Vancouver Island University, Nanaimo, V9R 5S5, Canada
推荐引用方式 GB/T 7714	Bevington A.R.,Gleason H.E.,Foord V.N.,et al. Regional influence of ocean-atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada[J],2019,13(10).
APA	Bevington A.R.,Gleason H.E.,Foord V.N.,Floyd W.C.,&Griesbauer H.P..(2019).Regional influence of ocean-atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada.The Cryosphere,13(10).
MLA	Bevington A.R.,et al."Regional influence of ocean-atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada".The Cryosphere 13.10(2019).