内蒙古草原区积雪资源时空分布和影响因子研究.pdf

摘 要 积雪的时空分布研究是目前全球变化研究的热点，内蒙古草原区是全球气候变 化的敏感区和关键区，其积雪的时空分布对气候变化的影响和响应研究具有重要意 义。本文利用多年MODIS 遥感资料以及近20 年的地面气象台站观测资料，研究了内 蒙古草原区积雪空间和时间分布，分析了原因，得出以下结论： 1、积雪主要分布在内蒙古的中东部地区，集中于草甸草原和典型草原。西部地 区仅有少量积雪覆盖。利用地面气象台站实测数据制作的地面雪深等值面图与利用 MODIS 数据制作的雪盖图的积雪覆盖范围基本吻合。 2、内蒙古草原区年内积雪变化较大，10 月份开始产生积雪，并呈上升趋势， 到第二年的1 月份达到最大，2、3 月份开始下降，4 月份内蒙古草原区基本上就不 再有积雪。 3、用内蒙古草原区五个典型气象台站的资料，分析影响积雪的六个主要气候因 子：平均温度、大风日数、风速、降水、日照时数、水汽压，并建立多元回归方程 模拟积雪深度，所得的模拟值与实测值之间的相关系数较好，均通过了0.01 的显著 性水平检验。 关键词：积雪；时空分布；影响因子；气象台站数据；MODIS 数据 The Analysis of Snow Distribntion and Impact Factors in Inner Mongolia Grassland Abstract Nowadays,spatial and temporal distribution of snow is the focus of global change researches. Inner Mongolia grassland area is a sensitive and key region in global climate change,the research of which have significance on climate change. In this paper, many years of MODIS Remote Sensing data and observations from Ground weather stations in the past 20 years are used.Studied the spatial and temporal distribution of snow in Inner Mongolia grassland area and analyzed the reasons,I make the following conclusions: 1. Snow distributed in central and eastern of Inner Mongolia region, concentrated in Meadow steppe and Steppe.Only a small amount of snow covering the western region. Iso-surface ground snow depth maps that are made from the date of Ground weather stations is basically consistent with the snow coverage in snow cover map made by MODIS Remote Sensing data. 2. Snow in Inner Mongolia grassland changed greatly during the year, Beginning to snow in October, and rising.The next year, Snowfall reaches to the maximum in January, Snow begins to fall during the February and March.In April,there is basica