| 2001—2020年三江源地区积雪日数变化及地形分异 |
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| 引用本文： | 曹晓云,肖建设,郝晓华,史飞飞,刘致远,李素雲.2001—2020年三江源地区积雪日数变化及地形分异[J].干旱区地理,2022,45(5):1370-1380. |
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| 作者姓名： | 曹晓云 肖建设 郝晓华 史飞飞 刘致远 李素雲 |
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| 作者单位： | 1.青海省防灾减灾重点实验室,青海 西宁 8100012.青海省气象科学研究所,青海 西宁 8100013.中国科学院西北生态环境资源研究院,甘肃 兰州 7300994.青海师范大学地理科学学院,青海 西宁 810001 |
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| 基金项目： | 青海省防灾减灾重点实验室开放基金项目(QFZ-2021-Z01);国家自然科学基金项目(41761078);国家自然科学基金项目(41861049);风云卫星应用先行计划项目(FY-APP-2021.0409);青海省科技计划项目(2020-ZJ-731);科技部国家科技基础资源调查专项(2017FY100501) |
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| 摘 要： | 基于积雪面积逐日无云遥感产品和气象观测资料,分析了2001—2020年三江源地区积雪日数的水平、垂直分布特征及变化规律,并对积雪日数与气温和降水量进行了相关分析。结果表明：（1） 2001—2020年三江源地区积雪日数呈西高东低,高海拔山脉大于盆地平原的分布格局,高海拔山脉地区积雪日数均值普遍大于200 d,85.48%的区域积雪日数呈波动增加趋势,显著增加区域占比为16.59%,平均增加速率为0.98 d·a-1。（2） 积雪日数及其变化趋势存在明显的海拔和坡向分异,积雪日数随海拔上升呈指数型增加,较低海拔（<3.0 km）区域积雪日数少、呈减少趋势且减少速率随海拔高度上升而加快;高海拔区域积雪日数较多且呈增多趋势,但海拔大于4.4 km后积雪日数增多速率随海拔上升而减缓,且5.5~6.0 km地区积雪日数呈减少趋势,高海拔地区积雪日数存在一定程度的“海拔依赖性”。积雪日数北坡大于南坡、西坡大于东坡,西北坡积雪日数最多,为78.30 d,不同坡向的积雪日数均呈增多趋势,其中西坡的增多速率最快,达1.04 d·a-1。（3） 近20 a三江源地区明显的“暖湿化”气候特征是影响积雪日数变化的主要原因,其中降水量是主要驱动因素,积雪日数增多与降水量增加密切相关,且高海拔地区积雪日数对降水量的依赖性更强。
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| 关 键 词： | 三江源地区 积雪日数 气候变化 地形分异 |
| 收稿时间： | 2021-12-14 |
Variation of snow cover days and topographic differentiation in Sanjiangyuan area from 2001 to 2020 |
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| CAO Xiaoyun,XIAO Jianshe,HAO Xiaohua,SHI Feifei,LIU Zhiyuan,LI Suyun.Variation of snow cover days and topographic differentiation in Sanjiangyuan area from 2001 to 2020[J].Arid Land Geography,2022,45(5):1370-1380. |
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| Authors: | CAO Xiaoyun XIAO Jianshe HAO Xiaohua SHI Feifei LIU Zhiyuan LI Suyun |
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| Institution: | 1. Key Laboratory of Disaster Prevention and Mitigation of Qinghai Province, Xining 810001, Qinghai, China2. Institute of Qinghai Meteorological Science Research, Xining 810001, Qinghai, China3. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730099, Gansu, China4. School of Geographical Sciences, Qinghai Normal University, Xining 810001, Qinghai, China |
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| Abstract: | In this work, based on daily cloudless remote sensing of snow cover and meteorological observation data, the horizontal and vertical distribution characteristics of and variations in snow cover days in the Sanjiangyuan (Three Rivers Headwaters) area of Qinghai, China from 2001 to 2020 are analyzed; the correlation between snow cover days and temperature and precipitation are also analyzed using the same data source. The results showed that: (1) From 2001 to 2020, the number of snow cover days in Sanjiangyuan area was higher in the west and lower in the east; the number of snow cover days is higher in the high-altitude mountain regions than in the basin plain. The average snow cover days in high-altitude mountains was generally greater than 200 d. The number of snow cover days in 85.48% of the areas showed an increasing tendency (with fluctuations), increasing by 16.59%, and the average rate of increase was 0.98 d·a-1. (2) There were clear differences in the number of snow cover days and their variation over the study period based on the altitude and aspectality of the study region. The number of snow cover days increases exponentially with increasing altitude: at low altitude (<3.0 km) the snow covered area was found to be small and shows a decreasing trend. At low altitudes the number of snow cover days rate of reduction accelerates with increasing altitude. At high-altitude areas the number of snow cover days is larger and shows an increasing tendency, but the increase rate in the number of snow cover days at heights of more than 4.4 km decreases as the altitude increases. In the elevation range 5.5-6.0 km, the number of snow covered days showed a tendency to decrease. The number of snow cover days onnorth-facing slopes is greater than that on south-facing slopes; west-facing slopes show a larger number of snow cover days than east-facing slopes. Northwest-facing slopes have the largest number of snow cover days with 78.30 d. The rate at which the number of snow covered days increases was found to be greatest for west-facing slopes (1.04 d·a-1). (3) The warm and humid climatic characteristics of the Sanjiangyuan area over the past 20 years were the main causes of the change in the number of snow cover days; precipitation was also a primary driving factor, and the increase of snow cover days was closely related to the increase in precipitation; snow cover days at high altitudes are more dependent on precipitation. |
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| Keywords: | Sanjiangyuan area snow cover days climate change topographic differentiation |
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