Author:
Tong J.,Déry S. J.,Jackson P. L.
Abstract
Abstract. A spatial filter (SF) is used to reduce cloud coverage in Moderate Resolution Imaging Spectroradiometer (MODIS) 8-day maximum snow cover extent products (MOD10A2) from 2000–2007, which are obtained from MODIS daily snow cover extent products (MOD10A1), to assess the topographic control on snow cover fraction (SCF) and snow cover duration (SCD) in the Quesnel River Basin (QRB) of British Columbia, Canada. Results show that the SF reduces cloud coverage and improves by 2% the accuracy of snow mapping in the QRB. The new product developed using the SF method shows larger SCF and longer SCD than MOD10A2, with higher altitudes experiencing longer snow cover and perennial snow above 2500 m. The gradient of SCF with elevation (d(SCF)/dz) during the snowmelt season is 8% (100 m)−1. The average ablation rates of SCF are similar for different 100 m elevation bands at about 5.5% (8 days)−1 for altitudes <1500 m with decreasing values with elevation to near 0% (8 days)−1 for altitudes >2500 m. Different combinations of slopes and aspects also affect the SCF with a maximum difference of 20.9% at a given time. Correlation coefficients between SCD and elevation attain 0.96 (p<0.001). Mean gradients of SCD with elevation are 3.8, 4.3, and 11.6 days (100 m)−1 for the snow onset season, snowmelt season, and entire year, respectively. The SF decreases the standard deviations of SCDs compared to MOD10A2 with a maximum difference near 0.6 day, 0.9 day, and 1.0 day for the snow onset season, snowmelt season, and entire year, respectively.
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
Reference28 articles.
1. Baral, D. J. and Gupta, R. P.: Integration of satellite sensor data with DEM for the study of snow cover distribution and depletion pattern, Int. J. Remote Sens., 18, 3889–3894, https://doi.org/10.1080/014311697216711, 1997.
2. Barnett, T. P., Adam, J. C., and Lettenmaier, D. P.: Potential impacts of a warming climate on water availability in snow-dominated regions, Nature, 438, 303–309, https://doi.org/10.1038/nature04141, 2005.
3. Blöschl, G., Kirnbauer, R., and Gutknecht, D.: Distributed snowmelt simulations in an alpine catchment 1. Model evaluation on the basis of snow cover patterns, Water Resour. Res., 27(12), 3171–3179, 1991.
4. Brown, R. D.: Northern hemisphere snow cover variability and change 1915–1997, J. Clim., 13, 2339–2355, 2000.
5. Brown, R. D.: Snow cover variability and trends in the Mackenzie Basin, 1945–2005, in: Final Report of the Mackenzie GEWEX Study (MAGS): Proceeding of the Final (11th) Annual Scientific Meeting, edited by: di Cenzo, P., 319–337, 2006.
Cited by
56 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献