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首页> 外文期刊>Remote Sensing >Remote Sensing of 2000?¢????2016 Alpine Spring Snowline Elevation in Dall Sheep Mountain Ranges of Alaska and Western Canada
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Remote Sensing of 2000?¢????2016 Alpine Spring Snowline Elevation in Dall Sheep Mountain Ranges of Alaska and Western Canada

机译:2000年的遥感影像-2016年阿拉斯加和加拿大西部大绵羊山脉的高山春季雪线海拔升高

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The lowest elevation of spring snow (?¢????snowline?¢????) is an important factor influencing recruitment and survival of wildlife in alpine areas. In this study, we assessed the spatial and temporal variability of alpine spring snowline across major Dall sheep mountain areas in Alaska and northwestern Canada. We used a daily MODIS snow fraction product to estimate the last day of 2000?¢????2016 spring snow for each 500-m pixel within 28 mountain areas. We then developed annual (2000?¢????2016) regression models predicting the elevation of alpine snowline during mid-May for each mountain area. MODIS-based regression estimates were compared with estimates derived using a Normalized Difference Snow Index from Landsat-8 Operational Land Imager (OLI) surface reflectance data. We also used 2000?¢????2009 decadal climate grids to estimate total winter precipitation and mean May temperature for each of the 28 mountain areas. Based on our MODIS regression models, the 2000?¢????2016 mean May 15 snowline elevation ranged from 339 m in the cold arctic class to 1145 m in the interior mountain class. Spring snowline estimates from MODIS and Landsat OLI were similar, with a mean absolute error of 106 m. Spring snowline elevation was significantly related to mean May temperature and total winter precipitation. The late spring of 2013 may have impacted some sheep populations, especially in the cold arctic mountain areas which were snow-covered in mid-May, while some interior mountain areas had mid-May snowlines exceeding 1000 m elevation. We found this regional (>500,000 km 2 ) remote sensing application useful for determining the inter-annual and regional variability of spring alpine snowline among 28 mountain areas.
机译:春季降雪的最低高度是影响高山地区野生动植物的募集和生存的重要因素。在这项研究中,我们评估了阿拉斯加和加拿大西北部主要Dall绵羊山区的高山春季雪线的时空变化。我们使用每日MODIS降雪分数产品估算28个山区中每500 m像素2000年的最后一天2016年春季降雪。然后,我们开发了年度(2000年– 2016年)回归模型,预测了每个山区在5月中旬的高山雪线高度。将基于MODIS的回归估算值与使用Landsat-8实用陆地成像仪(OLI)表面反射率数据的归一化雪差指数得出的估算值进行比较。我们还使用2000年至2009年的十年气候网格估算了28个山区中每个山区的冬季总降水量和5月平均温度。根据我们的MODIS回归模型,2016年5月15日的2000年5月15日平均雪线高度范围从寒冰北极类的339 m到内山类的1145 m。来自MODIS和Landsat OLI的春季雪线估算值相似,平均绝对误差为106 m。春季雪线的升高与五月平均温度和冬季总降水量显着相关。 2013年春末可能影响了一些绵羊种群,特别是在寒冷的北极山区,在5月中旬积雪,而在一些内部山区,5月中旬的雪线海拔超过1000 m。我们发现该区域(> 500,000 km 2)遥感应用程序对于确定28个山区之间的春季高山雪线的年际和区域变化很有用。

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