西北地区陆表水体退化对区域气溶胶时空格局的影响  

Effects of degraded land surface water on spatiotemporal distribution of regional aerosols over northwest China

作　　者：王敬哲 丁建丽[3] 陈香月 葛翔宇 伍杨屹 WANG Jingzhe;DING Jianli;CHEN Xiangyue;GE Xiangyu;WU Yangyi(School of Artificial Intelligence,Shenzhen Polytechnic University,Shenzhen 518055,Guangdong,China;State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;Xinjiang Key Laboratory of Oasis Ecology,Xinjiang University,Urumqi 830017,China;College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;College of Geography and Remote Sensing Sciences,Xinjiang University,Urumqi 830017,China;School of Urban Design,Wuhan University,Wuhan 430072,China)

机构地区：[1]深圳职业技术大学人工智能学院,深圳518055 [2]中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京100101 [3]新疆大学新疆绿洲生态自治区重点实验室,乌鲁木齐830017 [4]兰州大学大气科学学院,兰州730000 [5]新疆大学地理与遥感科学学院,乌鲁木齐830017 [6]武汉大学城市设计学院,武汉430072

出　　处：《地理学报》2025年第1期147-166,共20页Acta Geographica Sinica

基　　金：天山创新团队项目(2022TSYCTD0001);新疆维吾尔自治区自然科学基金重点项目(2021D01D06);国家自然科学基金项目(42171269);广东省基础与应用基础研究基金项目(2023A1515011273);深圳市高等院校稳定支持计划(20220811173316001);资源与环境信息系统国家重点实验室开放基金。

摘　　要：陆表水资源的减少,尤其是干旱区湖泊及其毗邻湿地的退化可能会导致产生新的盐/沙尘暴热点。全球变化背景下,西北地区陆表水体退化对区域气溶胶时空格局的影响尚不清晰。本文基于MODIS地表反射率数据(MOD09A1)提出了基于多种遥感指数动态阈值的水体识别方法对区域水体进行提取,在此基础上联合MAIAC气溶胶光学厚度(AOD)产品,系统分析了区域长时序陆表水体与AOD的动态变化;随后使用偏最小二乘路径模型(PLSPM)综合评估了不同时空尺度下陆表水体退化对盐/沙尘气溶胶的影响机制。研究发现:①2000—2020年西北地区陆表水体呈持续增长趋势,陆表水资源98%以上分布在青海、新疆两省区。②西北地区的AOD呈显著的季节性特征,所有省区AOD值均在春季达到了峰值,而在秋季为全年最低,高值主要集中分布在塔克拉玛干沙漠和黄土高原地区。③在以自然景观为主的整个西北地区及青海湖和艾比湖典型湖区,陆表水体面积的增(减)能够直接且显著地抑制(促进)气溶胶的增长。研究结果对理解干旱区不同地理单元盐/沙尘气溶胶的释放、传输过程与机制具有重要意义,同时也为干旱区水土资源管理及生态保育提供科学依据。The degradation of surface water resources,particularly in lakes and wetlands of arid regions,poses the risk of salt and dust storms.However,the impacts of the diminution of surface water on the spatiotemporal dynamics of regional aerosol patterns,especially in northwest China in the context of global environmental change is still unclear.Utilizing MODIS surface reflectance data(MOD09A1),this study introduces a dynamic threshold-based methodology for water body identification using multiple remote sensing indices.This framework is coupled with Multiangle Implementation of Atmospheric Correction(MAIAC)Aerosol Optical Depth(AOD)product to systematically assess the temporal dynamics of both surface water bodies and AOD.Employing a partial least squares path modeling(PLSPM)approach,this study comprehensively evaluates the mechanisms of surface water degradation on salt/sand and dust aerosols across various spatiotemporal scales.The results indicate that:(1)Surface water in the study area has exhibited a consistent upward trend from 2000 to 2020,with over 98%of resources localized in Qinghai and Xinjiang.(2)AOD levels in the northwest region demonstrate marked seasonality,peaking in spring and registering annual lows in autumn.High AOD concentrations are primarily in the Taklamakan Desert and the Loess Plateau.(3)In northwest China,as well as the typical regions of Qinghai Lake and Ebinur Lake featured by natural landscapes,fluctuations in surface water area directly and significantly correlate with aerosol growth.These findings have substantial implications for understanding salt and dust aerosol release and transmission mechanisms in arid regions while providing a scientific basis for resource management and ecological conservation.

关 键 词：陆表水体 气溶胶 时空格局 PLSPM 中国西北地区 

分 类 号：P425.55[天文地球—大气科学及气象学] X16[环境科学与工程—环境科学] X143