喀喇昆仑冰川夏季反照率的时空变化及其原因

发布时间：2021-05-21 21:19

　　冰川表面吸收的太阳辐射能量由表面反照率确定。因此反照率在调节冰川的热量平衡中扮演了重要角色。由于全球气候变化,全世界的冰川和冰帽的物质损失速率持续加快。山岳冰川虽然大约占地球总冰量3%,冰川融化对海平面上升有重要贡献。全球范围内冰川变化将对气候和海平面产生影响,因此定量监测冰川变化对了解气候变化具有重要的指导意义。太阳辐射是最主要的热量来源,是冰川退缩的主要原因。最近的研究表明,喀喇昆仑山脉的冰川因气候变化和人为活动而融化,部分人为活动使冰川变黑,也成为冰川退缩的原因之一。当反照率减小时,冰川的表面融化极有可能发生。过去的数项研究估算了世界各地冰川表面反照率的时空变化,但是很少有研究关注喀喇昆仑山区冰川的反照率变化。因此有必要了解整个喀喇昆仑地区的地表反照率（估算冰川表面融化的必要条件）的时空变化。本文首次全面研究并讨论了该地区和整个巴基斯坦喀喇昆仑冰川地区主要冰川的夏季反照率的变化情况。本研究的主要目的是评估巴基斯坦喀喇昆仑山冰川在2000-2018年夏季（6月,7月和8月）地表反照率的时空变化。使用中分辨率成像光谱仪（MODIS）数据估算冰川表面反照率。并结合了MODIS Terr... 

【文章来源】：南京大学江苏省 211工程院校 985工程院校 教育部直属院校

【文章页数】：88 页

【学位级别】：硕士

【文章目录】：
ABSTRACT
摘要
CHAPTER ONE INTRODUCTION
    1.1 Albedo
    1.2 Factors Controlling Surface Albedo
        1.2.1 Cloud Cover
        1.2.2 Solar Zenith Angle(SZA)
        1.2.3 Snow Grain Size
        1.2.4 Meteorological factors
        1.2.5 Anthropogenic Activities
    1.3 Literature Review
        1.3.1 Glacier Albedo
        1.3.2 MODIS-Observed Glacier Albedo
    1.4 Aim of the Research
CHAPTER TWO DATA AND METHODS
    2.1 Study Area
        2.1.1 Geographic location
        2.1.2 Geological Setting and Geomorphology
        2.1.3 Climate
        2.1.4 Hydrology and glaciers
    2.2Data
        2.2.1 MODIS Daily Snow Product(MOD10A1/MYD10A1)
        2.2.2 Climate Data
        2.2.3 Digital Elevation Model
    2.3 Methods
        2.3.1 MODIS Data Processing Scheme
        2.3.2 Clouds Elemination
CHAPTER THREE GLACIER ALBEDO VARIATIONS
    3.1 Glacier surface albedo variations
    3.2 Trend of the glacier surface albedo variation
    3.3 Albedo difference between2000 and2018
    3.4 Albedo Variations with Elevation
    3.5 Siachen Glacier
        3.5.1 Interannual variation at Siachen Glacier
        3.5.2 Albedo change between2000 and2018
        3.5.3 Albedo trend with increasing elevation
    3.6 Baltoro Glacier
        3.6.1 Interannual albedo variations at Baltoro glacier
        3.6.2 Albedo Change between2000 and2018
        3.6.3 Albedo trend with elevation
    3.7 Biafo Glacier
        3.7.1 Interannual albedo variations at Biafo glacier
        3.7.2 Albedo change between2000 and2018
        3.7.3 Albedo variation with elevation
    3.8 Hispar Glacier
        3.8.1 Interannual albedo variations at Hispar glacier
        3.8.2 Albedo change between2000 and2018
        3.8.3 Albedo trend with elevation
    3.9 Panmah Glacier
        3.9.1 Interannual variations in albedo at Panmah glacier
        3.9.2 Albedo change between2000 and2018
        3.9.3 Albedo trend with elevation
CHAPTER FOUR POTENTIAL CAUSES FOR ALBEDO VARIATION
    4.1 Climatic Factors
    4.2 Other factors influencing surface albedo
CHAPTER FIVE CONCLUSION AND OUTLOOK
REFERENCES
ACKNOWLEDGEMENT



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