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Remote Sensing for Natural Resources    2024, Vol. 36 Issue (4) : 260-271     DOI: 10.6046/zrzyyg.2023189
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Impacts of changes in land cover on solar radiation absorption in northwestern China
SHI Ying1(), BIE Qiang1,2,3(), SU Xiaojie1, LI Xinzhang1
1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China
2. National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, China
3. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China
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Abstract  

The changes in land cover types will affect the amount of solar radiant energy absorbed by the land surface and then influence the radiative equilibrium of the surface ecosystem. Under the background of dramatic changes in land cover, the patterns and changes of the solar radiation absorptivity of land exert significant influence on the thermal equilibrium of the land surface. Based on the MODIS MCD12Q1 land cover data, the MCD43A3 surface albedo data, and the MCD43A2 solar zenith angle data from 2001 to 2020, along with two adjacent phases of spatiotemporal changes in the surface cover types and the solar radiant energy absorbed by land surface across northwestern China, this study analyzed and explored the impacts of the changes in land cover types on solar radiation absorption. The results indicate that the changes in land cover types in the study area are primarily characterized by reduced bare land area and the expansion of other land cover types, with the largest areal change occurring in the shift from bare land to grassland. Different types of land cover display varying solar radiation absorptivities. Water bodies exhibit the greatest solar radiation absorptivity, followed by woodland, cultivated land, grassland, and construction land, with bare land and permanent ice and snow presenting the poorest solar radiation absorptivities. The conversion of land cover types will lead to different radiation absorptivities. Specifically, the transfer from grassland, cultivated land, bare land, and permanent ice and snow primarily exhibits an increasing trend in solar radiation absorptivity, while that of water bodies and forest land largely displays a decreasing trend. The same land cover type differs in the time series of solar radiation absorption, which primarily increases for construction land, grassland, cultivated land, bare land, and water bodies but decreases for woodland and permanent ice and snow. The results of this study will provide a scientific basis and reference for research on climatic change, ecological construction, and sustainable development in northwestern China.
Keywords change in surface cover      blue sky albedo      solar radiation absorptivity      northwestern China     
ZTFLH:  TP79  
Issue Date: 23 December 2024
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Ying SHI
Qiang BIE
Xiaojie SU
Xinzhang LI
Cite this article:   
Ying SHI,Qiang BIE,Xiaojie SU, et al. Impacts of changes in land cover on solar radiation absorption in northwestern China[J]. Remote Sensing for Natural Resources, 2024, 36(4): 260-271.
URL:  
https://www.gtzyyg.com/EN/10.6046/zrzyyg.2023189     OR     https://www.gtzyyg.com/EN/Y2024/V36/I4/260
Fig.1  Flow chart
Fig.2  Location of the study area
归并后 值 描述 对应IGBP地表覆被类型
林地 1 树木覆盖率>60% 1常绿针叶林、2常绿阔叶林、3落叶针叶林、4落叶阔叶林、5混交林、6郁闭灌木丛、7开放灌木丛
草地 2 草本植物为主,树木
覆盖率10%~60%		 8多树草地、9稀树草地、10草地
耕地 3 种植农作物土地 12耕地、14农田/自然植被
水体 4 永久湿地与水域 11永久湿地、17水域
建设用地 5 居民点、交通等用地 13城市区和建筑用地
永久冰雪 6 冰与积雪 15永久冰雪
裸地 7 未利用土地 16裸地
Tab.1  Reclassify information
Fig.3-1  Spatial distribution of land cover classification
Fig.3-2  Spatial distribution of land cover classification
时间 类型
林地 草地 耕地 水体 建设用地 永久冰雪 裸地
2001年 68 418.15 1 135 276.41 151 978.12 16 918.54 8 129.77 15 056.37 1 613 118.60
2005年 71 313.26 1 135 107.04 159 211.47 16 846.20 8 192.02 22 361.85 1 595 864.12
2010年 76 573.25 1 135 563.62 170 331.43 17 215.41 8 288.61 21 068.10 1 579 855.52
2015年 79 796.14 1 132 188.33 180 304.04 17 715.99 8 474.08 22 984.58 1 567 432.80
2020年 87 243.72 1 146 912.84 180 416.95 18 555.95 8 690.67 25 400.34 1 541 675.48
Tab.2  Changes in the area of different land cover types(km2)
2001年 2020年
林地 草地 耕地 水体 建设用地 永久冰雪 裸地 合计
林地 — 2 691.18 24.9 41.43 0 60.75 79.21 2 897.47
草地 18 465.15 — 47 131.31 952.23 196.63 172.8 14 965.57 81 883.69
耕地 2 497.34 18 492.2 — 29.62 355.69 0 27.69 21 402.54
水体 98.74 291.72 12.88 — 0 309.32 752.16 1 464.82
建设用地 0 0 0 0 — 0 0 0
永久冰雪 0.64 62.04 0.86 10.52 0 — 1 600.49 1 674.55
裸地 661.15 71 982.99 2 671.43 2 068.45 8.59 11 475.65 — 88 868.26
合计 21 723.02 93 520.13 49 841.38 3 102.25 560.91 12 018.52 17 425.12 198 191.33
  
Fig.4-1  Spatial distribution of land cover classification changes
Fig.4-2  Spatial distribution of land cover classification changes
Fig.5  Changes in land cover type shifts during 2001—2020
Fig.6  Spatial distribution of solar radiation absorbed by the Earth’s surface
Fig.7  Numerical ranges of average annual absorption of solar radiation by different land cover types
Fig.8  Spatial distribution of surface albedo changes
Fig.9  Spatial distribution of changes in solar radiation absorption by different surface types
Fig.10  Changes in solar radiation absorption by different surface types
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