摘要
基于中分辨率成像光谱仪积雪产品,经过去云处理和精度验证制备出高精度逐日无云二值积雪分布数据,并提取积雪物候参数.使用空间分析和统计方法探究2001-2017水文年中国东北地区积雪物候时空变化规律.结果表明,东北大部分地区从11月份开始出现大面积的降雪,且积雪开始日期(SCOD)随着纬度的升高而提前;积雪覆盖天数(SCD)和积雪结束日期(SCED)均与地形地貌分布趋势相吻合,呈现“山区高SCD(SCED)、平原低SCD(SCED)”的分布特征;纬度上呈现“高纬度高SCD(SCED)、低纬度低SCD(SCED)”的分布规律.辽河平原和松嫩平原SCD和SCED均较小, SCD最低少于10 d,大兴安岭北部SCD较大,最高超过230 d;SCED最早在当年11月, SCED较晚的区域主要分布于大兴安岭和小兴安岭,最晚在次年5月.近20 a来,东北地区SCD呈增加趋势, SCOD和SCED均推迟延后,其中SCED变化趋势更为明显.
Based on the moderate-resolution imaging spectrometer snow products, the high-accuracy daily cloudless binary snow data were prepared after cloud removal and validation, and snow phenological parameters were extracted. Spatial analysis and statistical methods were used to study the temporal and spatial variation of snow phenology in Northeast China in 2001-2017 hydrological years. The results indicated that large areas of snow began to appear in most areas from November and the snow cover onset dates(SCOD) showed an earlier trend as the latitude increased;the snow cover days(SCD) and snow cover end dates(SCED) were consistent with the distribution trend of the topography, showing the distribution characteristics of "mountain-high SCD(SCED)" and "plain-low SCD(SCED)";as far as the latitude was concerned, there was a distribution of "high latitude-high SCD(SCED), low latitude-low SCD(SCED)". SCD and SCED were small in the Liaohe Plain and Songnen Plain, the minimum SCD was less than 10 d, the SCD larger in the north of the Daxing’an Mountains, and the maximum SCD more than 230 d. The earliest SCED was in November of the year, the late SCED was mainly distributed in the Daxing’an Mountains and Xiaoxing’an Mountains, and the latest SCED was in May the next year. During the past 20 years, SCD increased, SCOD and SCED were both delayed and SCED changed more obviously in the Northeast China.
作者
郭慧
郭泽呈
陈思勇
王晓艳
GUO Hui;GUO Ze-cheng;CHEN Si-yong;WANG Xiao-yan(College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;School of Geography and Ocean Science,Nanjing University,Nanjing 210008,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第4期502-509,共8页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金项目(41771373)
资源与环境信息系统国家重点实验室开放基金项目
科技部基础资源调查专项(2017FY100500)。
关键词
积雪覆盖日数
积雪开始日期
积雪结束日期
时空变化
中国东北地区
snow cover day
snow cover onset date
snow cover end date
temporal and spatial variation
Northeast China
