地球信息科学学报 ›› 2017, Vol. 19 ›› Issue (5): 635-645.doi: 10.3724/SP.J.1047.2017.00635
收稿日期:
2015-10-21
修回日期:
2016-11-21
出版日期:
2017-05-20
发布日期:
2017-05-20
通讯作者:
除多
E-mail:chu_d22@hotmail.com
作者简介:
作者简介:除 多(1969- ),男,西藏白朗县人,博士,正研级高级工程师,主要从事卫星遥感应用研究。E-mail:
基金资助:
CHU Duo1,2,*(), DA Zhen3, LABA Zhuoma2
Received:
2015-10-21
Revised:
2016-11-21
Online:
2017-05-20
Published:
2017-05-20
Contact:
CHU Duo
E-mail:chu_d22@hotmail.com
摘要:
利用2000-2014年MOD10A2积雪产品和数字高程模型DEM数据,以积雪覆盖率为指标,在分析西藏高原积雪空间分布特点的基础上,定量研究了高程、坡度和坡向等地形要素对高原积雪时空分布的影响。主要结论有:① 西藏高原积雪的空间分布差异显著,具有中东部念青唐古拉山和周边高山积雪丰富,覆盖率高,而南部河谷和羌塘高原中西部积雪少,覆盖率低的特点。② 海拔越高积雪覆盖率越高,积雪持续时间越长,年内变化越稳定。海拔2 km以下积雪覆盖率不足4%,海拔6 km以上覆盖率达75%。海拔4 km以下年内积雪覆盖呈单峰型分布特点,海拔越高,单峰型越明显;而海拔4 km以上则为双峰型,海拔越高,双峰型越明显。海拔6 km以下积雪覆盖率最低值出现在夏季,而6 km以上则出现在冬季。③ 总体上,高原地形坡度越高积雪覆盖率越高。不同坡向中,北坡积雪覆盖率最高,南坡最低,年内分布呈双峰型,而无坡向的平地积雪覆盖率要小于有坡向的山地,其年内变化呈单峰型分布特点。
除多, 达珍, 拉巴卓玛. 西藏高原积雪覆盖空间分布及地形影响[J]. 地球信息科学学报, 2017, 19(5): 635-645.DOI:10.3724/SP.J.1047.2017.00635
CHU Duo,DA Zhen,LABA Zhuoma. Spatio-temporal Distribution Patterns of Snow Cover on the Tibet and Orographic Impacts[J]. Journal of Geo-information Science, 2017, 19(5): 635-645.DOI:10.3724/SP.J.1047.2017.00635
表2
西藏高原逐月平均积雪覆盖率随坡向分布(%)"
序号 | 范围/° | 注释 | 1月 | 2月 | 3月 | 4月 | 5月 | 6月 | 7月 | 8月 | 9月 | 10月 | 11月 | 12月 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | -1 | 无坡向 | 19.7 | 21.1 | 19.9 | 15.5 | 8.9 | 3.1 | 0.5 | 0.5 | 0.7 | 1.5 | 7.4 | 15.9 |
2 | 0~45 315~360 | 北坡 | 24.9 | 26.8 | 26.5 | 24.4 | 20.8 | 10.6 | 3.6 | 4.7 | 9.6 | 23.3 | 26.5 | 22.4 |
3 | 45~135 | 东坡 | 22.9 | 26.6 | 26.9 | 24.3 | 19.8 | 9.8 | 3.9 | 4.8 | 8.4 | 19.4 | 23.7 | 20.5 |
4 | 135~225 | 南坡 | 17.6 | 21.1 | 19.9 | 17.7 | 15.0 | 7.8 | 2.7 | 3.5 | 6.5 | 14.6 | 16.5 | 14.4 |
5 | 225~315 | 西坡 | 22.6 | 25.9 | 25.7 | 23.4 | 18.7 | 8.6 | 3.1 | 4.1 | 7.7 | 18.9 | 22.8 | 19.6 |
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