Abstract：
Biomass burning play a key role in the global carbon cycle by altering the atmospheric composition, and affect regional and global climate. Despite its importance, a very few high-resolution records are available worldwide, especially for recent climate change. This study analyzes levoglucosan, a specific tracer of biomass burning emissions, in a 38-year ice core retrieved from the Shulehe Glacier No. 4, northeastern Tibetan Plateau. The levoglucosan concentration in the Shulehe Glacier No. 4 ice core ranged from 0.1 to 55 ng mL-1, with an average concentration of 8 ± 8 ng mL-1. The concentrations showed a decreasing trend from 2002 to 2018. Meanwhile, regional wildfire activities in Central Asian also exhibited a declining trend during the same period, suggesting the potential correspondence between levoglucosan concentration of the Shulehe Glacier No. 4 ice core and the fire activity of Central Asia. Furthermore, a positive correlation also exists between the levoglucosan concentration of the Shulehe Glacier No. 4 ice core and the wildfire counts in Central Asia from 2002 to 2018. While backward air mass trajectory analysis and fire spots data showed a higher distribution of fire counts in South Asia compared to Central Asia, but the dominance of westerly circulation in the northern TP throughout the year. Therefore, the levoglucosan in the Shulehe Glacier No. 4 provides clear evidence of Central Asian wildfire influence on Tibetan Plateau glaciers through westerlies. This highlights a great importance of ice core data for wildfire history reconstruction in the Tibetan Plateau Glacier regions.
摘要：
生物质燃烧通过改变大气成分在全球碳循环中起着关键作用，并影响区域和全球气候。尽管它很重要,世界上很少有高分辨率的记录，尤其是最近的气候变化。本研究分析了左旋葡聚糖，生物质燃烧排放物的特定示踪剂，在从舒勒河冰川编号中检索到的38年冰芯中。4、青藏高原东北部。舒乐河冰川No.4个冰芯的范围为0.1至55ngmL-1，平均浓度为8±8ngmL-1。浓度从2002年到2018年呈下降趋势。同时,同期，中亚地区野火活动也呈下降趋势，表明舒勒河冰川编号的左旋葡聚糖浓度之间的潜在对应关系。4．中亚的冰芯和火活动。此外，舒乐河冰川号的左旋葡聚糖浓度之间也存在正相关。从2002年到2018年，中亚有4个冰芯和野火。虽然向后的空气质量轨迹分析和火点数据显示，与中亚相比，南亚的火灾数量分布更高，但全年北半球西风环流占主导地位。因此,舒勒河冰川中的左旋葡萄糖山图4提供了中亚野火通过西风对青藏高原冰川影响的明确证据。这凸显了冰芯数据对青藏高原冰川地区野火历史重建的重要性。
