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WU Fangying, YOU Qinglong, CAI Ziyi, et al. 2022. Characteristics of Elevation Dependent Warming over the Tibetan Plateau Based on the MODIS Daytime Land Surface Temperature Data [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 46(2): 442−454. doi: 10.3878/j.issn.1006-9895.2111.21157
Citation: WU Fangying, YOU Qinglong, CAI Ziyi, et al. 2022. Characteristics of Elevation Dependent Warming over the Tibetan Plateau Based on the MODIS Daytime Land Surface Temperature Data [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 46(2): 442−454. doi: 10.3878/j.issn.1006-9895.2111.21157

Characteristics of Elevation Dependent Warming over the Tibetan Plateau Based on the MODIS Daytime Land Surface Temperature Data

  • Based on the moderate-resolution imaging spectroradiometer daytime land surface temperature (MODIS daytime LST) and maximum surface air temperature data of 122 meteorological stations from 2001 to 2018, the applicability of the MODIS daytime LST over the Tibetan Plateau (TP) was evaluated on an annual scale, and the elevation-dependent warming (EDW) characteristics of the MODIS daytime LST over five dry and wet subregions over the TP are studied. The main conclusions are as follows: (1) The MODIS daytime LST can capture the spatiotemporal and EDW characteristics of the observed maximum temperature over the TP. (2) On the whole, there is a significant EDW over the TP derived from the MODIS daytime LST. The temperature trend increases by 0.02°C (10a)−1 per 100 m, which is dominated by the snow albedo feedback. (3) In terms of subregions, EDW characteristics are stronger in the humid region than in the arid region, which also stronger in monsoon regions than in westerly regions. The characteristics of EDW are: semihumid region > humid /semihumid region > semiarid region > humid region > arid region. The MODIS daytime LST trend in the above regions increases by 0.06, 0.03, 0.03, 0.01, and 0.01°C(10a)−1 per 100 m, respectively. Annual mean temperatures in semihumid and humid/semihumid regions are about 0°C, and the snow albedo feedback is the strongest in a warming climate, dominating the EDW of the above regions. Annual mean temperatures in the arid and semiarid regions are relatively lower, and the influence of climate warming on the snow cover is relatively weaker with a weak snow albedo feedback. The increase in the snow cover in the humid region may be due to the increase in snowfall (solid precipitation) offsetting the loss of snow melting. Other factors such as cloud radiation and water vapor dominate its EDW over these regions.
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