干旱区研究 ›› 2022, Vol. 39 ›› Issue (5): 1385-1397.doi: 10.13866/j.azr.2022.05.05
收稿日期:
2022-03-15
修回日期:
2022-06-14
出版日期:
2022-09-15
发布日期:
2022-10-25
通讯作者:
唐志光
作者简介:
王靖文(1998-),男,硕士研究生,主要从事积雪遥感方面的研究. E-mail: 基金资助:
WANG Jingwen1(),TANG Zhiguang1(),DENG Gang1,HU Guojie2,SANG Guoqing1
Received:
2022-03-15
Revised:
2022-06-14
Online:
2022-09-15
Published:
2022-10-25
Contact:
Zhiguang TANG
摘要:
研究融雪末期雪线高度变化有助于预测冰雪系统未来的变化趋势、理解区域和全球气候变化。基于Google Earth Engine(GEE)平台和Landsat卫星数据,发展了区域雪线高度提取模型,提取了天山4个子流域1991—2021年的融雪末期雪线高度,并分析了雪线高度的变化特征及其与气象因素的关系。结果表明:(1) Landsat提取的融雪末期雪线高度与Sentinel-2提取的融雪末期“最小化”积雪范围具有较高的一致性,其总体精度为91.6%,Kappa系数达0.9以上,利用该模型可准确获取融雪末期的区域雪线高度。(2) 研究区近30 a融雪末期雪线高度呈明显的上升趋势,上升速率介于2.7~6.4 m·a-1之间;其中,玛纳斯河流域雪线高度上升速度最快,阿克牙孜河流域雪线高度上升速度最慢。(3) 夏季气温是影响研究区融雪末期雪线高度变化的主要因素(P< 0.05),降水对其影响相对较弱。
王靖文,唐志光,邓刚,胡国杰,桑国庆. 1991—2021年天山融雪末期雪线高度遥感监测研究[J]. 干旱区研究, 2022, 39(5): 1385-1397.
WANG Jingwen,TANG Zhiguang,DENG Gang,HU Guojie,SANG Guoqing. Monitoring of snowline altitude at the end of melting season in Tianshan Mountains from 1991 to 2021[J]. Arid Zone Research, 2022, 39(5): 1385-1397.
表1
研究区域Sentinel-2影像覆盖数量"
覆盖数量 | 分布时间/年-月-日 | |
---|---|---|
琼乌散库什河流域 | 26 | 2019-06-01—2019-09-30 2020-06-01—2020-09-30 2021-06-01—2021-09-30 |
木扎提河流域 | 24 | 2019-06-01—2019-09-30 2020-06-01—2020-09-30 2021-06-01—2021-09-30 |
阿克牙孜河流域 | 26 | 2019-06-01—2019-09-30 2020-06-01—2020-09-30 2021-06-01—2021-09-30 |
玛纳斯河流域 | 24 | 2019-06-01—2019-09-30 2020-06-01—2020-09-30 2021-06-01—2021-09-30 |
表2
Landsat融雪末期雪线高度提取结果精度评价"
研究子区 | Sentinel-2提取的验证样本 | 精度指标 | ||
---|---|---|---|---|
积雪/个数 | 非雪/个数 | |||
琼乌散库什河流域 | 高于Landsat提取雪线高度 | 291 | 76 | Pre=79.29% Rec=85.59% OA=87.5% Kappa=0.86 |
低于Landsat提取雪线高度 | 49 | 584 | ||
木扎提河流域 | 高于Landsat提取雪线高度 | 391 | 68 | Pre=85.19% Rec=96.07% OA=91.6% Kappa=0.90 |
低于Landsat提取雪线高度 | 16 | 525 | ||
阿克牙孜河流域 | 高于Landsat提取雪线高度 | 343 | 51 | Pre=87.06% Rec=93.97% OA=92.7% Kappa=0.92 |
低于Landsat提取雪线高度 | 22 | 584 | ||
玛纳斯河流域 | 高于Landsat提取雪线高度 | 406 | 34 | Pre=92.27% Rec=94.86% OA=94.4% Kappa=0.93 |
低于Landsat提取雪线高度 | 22 | 517 |
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