| 2000—2019年秦岭南北实际蒸散发时空变化特征 |
| |
| 引用本文： | 李双双,张玉凤,张立伟,王婷,延军平.2000—2019年秦岭南北实际蒸散发时空变化特征[J].地理科学进展,2021,40(11):1900-1910. |
| |
| 作者姓名： | 李双双 张玉凤 张立伟 王婷 延军平 |
| |
| 作者单位： | 陕西师范大学地理科学与旅游学院,西安 710119 |
| |
| 基金项目： | 国家自然科学基金项目(41871187);国家自然科学基金项目(41877519) |
| |
| 摘 要： | 基于遥感数据全面认识复杂地形单元实际蒸散发时空规律,对区域可持续水资源管理具有重要的意义。论文基于MODIS实际蒸散发(ET)数据,对2000—2019年秦岭南北ET时空变化特征进行分析,探究不同分区ET对植被变化的响应关系,进而识别ET趋势和年代变化的高相关海气环流因素。结果表明：① 在变化趋势上,以1000 m等高线为界,即秦岭地区北亚热带和山地暖温带的分界线,低海拔河谷地带为ET显著增加区,山地高海拔地区为ET下降区;② 除城市、乡镇周边地区,研究期间秦岭南北下垫面相对稳定,转为生态用地的活跃区主要分布在山地1000 m过渡带,其是ET与NDVI变化显著相关区,而1000 m以上高海拔地区两者相关性较低;③ ENSO、青藏高原北部气压异常,与秦岭山地、汉江谷地ET的趋势变化和年代波动显著相关,而西太平洋副热带高压与ET的趋势显著相关,与年代波动特征相关较弱。即发生中部型厄尔尼诺事件时,西太平洋副热带高压偏强,对流层低层形成异常反气旋,导致中国东部雨带北移,秦岭山地和汉江谷地降水偏少,气温偏高,ET往往偏大。研究结果启示：秦岭南北科学适应气候变化时,应关注秦岭山地、汉江谷地ET变化显著相关的环流信号;应深刻理解秦岭高海拔地区蒸散发下降趋势对区域水资源管理的影响。
|
| 关 键 词： | 气候变化 蒸散发 植被恢复 厄尔尼诺 时空变化 秦岭南北 |
| 收稿时间： | 2021-01-13 |
| 修稿时间： | 2021-03-03 |
Spatio-temporal variation of actual evapotranspiration in the south and north of the Qinling Mountains during 2000-2019 |
| |
| LI Shuangshuang,ZHANG Yufeng,ZHANG Liwei,WANG Ting,YAN Junping.Spatio-temporal variation of actual evapotranspiration in the south and north of the Qinling Mountains during 2000-2019[J].Progress in Geography,2021,40(11):1900-1910. |
| |
| Authors: | LI Shuangshuang ZHANG Yufeng ZHANG Liwei WANG Ting YAN Junping |
| |
| Institution: | School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China |
| |
| Abstract: | Remote sensing-based analysis on characterizing the spatio-temporal variation of actual evapotranspiration (ET) is essential for sustainable water resource management. The Qinling Mountains are transitional, and different land use patterns provide typical cases for understanding the relationship between ecological restoration and evapotranspiration under the global climate change and human activities. Based on MODIS ET and normalized difference vegetation index (NDVI) data, this study analyzed the spatiotemporal variation of ET in the north and south of the Qinling Mountains from 2000 to 2019, explored the relationship of ET with vegetation restoration in different regions, and analyzed the key ocean-atmosphere indices that influence the tendency and inter-annual change of ET in the study region. The results show that: 1) The contour of 1000 m is the boundary between the northern subtropical zone and the warm temperate zone of the mountains. High altitude mountainous areas (>1000 m) are the areas where the ET decreases significantly (P < 0.01), and low altitude valley areas (< 1000 m) are the areas where the ET increases significantly (P < 0.01). 2) Except for the surrounding areas of cities and towns, the underlying Earth surface of the north and south Qinling Mountains is relatively stable in recent 20 years. The active areas of land use cover change are mainly distributed in the mountainous transition zone of 1000 m, where ET and NDVI changes are significantly correlated, while the correlation between ET and NDVI is relatively low in high altitude areas above 1000 m. 3) ENSO and the atmospheric pressure anomaly in the northern Qinghai-Tibet Plateau can be used as teleconnection factors to explain the trend changes and interannual fluctuations of ET in the Qinling Mountains and the Hanjiang Valley. The correlation between western Pacific subtropical high and annual fluctuation characteristics of ET is weaker than the trend variation of ET in the Qinling Mountains and the Hanjiang Valley. When the central Pacific El Niño events occur, the subtropical high intensity in western Pacific is stronger, and the anomalous anticyclone is formed in the lower layer of the troposphere, which leads to the northward shift of rain belt, less precipitation, higher temperature, and larger evapotranspiration in the Qinling Mountains and the Hanjiang Valley. Our research results imply two useful perspectives for adapting to climate change in north and south of Qinling Mountains. Firstly, we should pay attention to the large-scale circulation anomalies with teleconnection impact associated with the variation of ET in Qinling Mountains and the Hanjiang Valley. Secondly, we need explicitly consider the decreasing of ET in the high altitude of Qinling Mountains influencing on the regional water-cycle components. |
| |
| Keywords: | climate change evapotranspiration vegetation restoration El Niño spatio-temporal variation south and north of the Qinling Mountains |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地理科学进展》浏览原始摘要信息 |
| 点击此处可从《地理科学进展》下载免费的PDF全文 |
|
