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Study of aerosol effect on accelerated snow melting over the Tibetan Plateau during boreal spring

机译：北方春季气溶胶对青藏高原积雪加速融化的研究

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In the present study, a coupled atmosphere-ocean global climate model (CSIRO-Mk3.6) is used to investigate the role of aerosol forcing agents as drivers of snow melting trends in the Tibetan Plateau (TP) region. Anthropogenic aerosol-induced snow cover changes in a warming climate are calculated from the difference between historical run (HIST) and all forcing except anthropogenic aerosol (NoAA). Absorbing aerosols can influence snow cover by warming the atmosphere, reducing snow reflectance after deposition. The warming the rate of snow melt, exposing darker surfaces below to short-wave radiation sooner, and allowing them to heat up even faster in the Himalayas and TP. The results show a strong spring snow cover decrease over TP when absorbing anthropogenic aerosol forcing is considered, whereas snow cover fraction (SCF) trends in NoAA are weakly negative (but insignificant) during 1951-2005. The enhanced spring snow cover trends in HIST are due to overall effects of different forcing agents: When aerosol forcing (AERO) is considered, a significant reduction of SCF than average can be found over the western TP and Himalayas. The large decreasing trends in SCF over the TP, with the maximum reduction of SCF around 12-15% over the western TP and Himalayas slope. Also accelerated snow melting during spring is due to effects of aerosol on snow albedo, where aerosol deposition cause decreases snow albedo. However, the SCF change in the "NoAA" simulations was observed to be less.
机译：在本研究中，采用大气海洋耦合全球气候模型（CSIRO-Mk3.6）来研究气溶胶强迫剂在青藏高原（TP）地区融雪趋势的驱动作用。根据历史运行（HIST）与除人类活动气溶胶（NoAA）以外的所有强迫之间的差异，计算人为气溶胶引起的积雪在气候变暖中的变化。吸收的气溶胶可通过使大气变暖而影响积雪，从而降低沉积后的积雪反射率。雪融化速度加快，使下面较暗的表面更快地暴露于短波辐射中，使它们在喜马拉雅山和TP的加热速度甚至更快。结果表明，在考虑人为气溶胶强迫的条件下，春季春季积雪比TP强烈减少，而1951-2005年期间NoAA的积雪趋势（SCF）微弱（但微不足道）。 HIST中春季积雪趋势的增强归因于不同强迫因素的整体影响：当考虑气溶胶强迫（AERO）时，西部TP和喜马拉雅山脉的SCF明显低于平均水平。 TP上SCF的下降趋势很大，西部TP和喜马拉雅山斜坡上SCF的最大减少幅度约为12-15％。春季期间雪融化加速还归因于气溶胶对雪反照率的影响，其中气溶胶沉积导致雪反照率降低。但是，观察到“ NoAA”模拟中的SCF变化较小。

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