Li Chaoliu, Hu Zhaofu, Kang Shichang, Kirillova Elena N, Yan Fangping, Chen Pengfei, Shen Guofeng, Jake Thompson T, Gustafsson Örjan
Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
Department of Earth and Planetary Sciences, Yale University, New Haven, Connecticut 06511, United States.
Environ Sci Technol. 2025 Mar 11;59(9):4571-4577. doi: 10.1021/acs.est.4c10040. Epub 2025 Feb 25.
Black carbon (BC) significantly contributes to atmospheric warming and glacier melting. However, the atmospheric lifetime of BC from different fuel sources remains poorly constrained. By analyzing ΔC of BC in PM and precipitation samples collected for three years at a remote site in the Tibetan Plateau, we found that BC from fossil fuel contribution ( BC) in PM exhibited greater seasonal variation than those from South Asia and emission inventories. Precipitation-induced fractionation between fossil fuel combustion-derived BC (BC) and biomass burning-derived BC (BC) resulted in an increase of BC to 68 ± 7% during the wet monsoon season, which is significantly higher than levels measured at a background site in South Asia and in simultaneously collected precipitation samples. Our findings provide direct evidence that the lifetime of BC is longer than that of BC during the monsoon season. These results emphasize the increased climate forcing of BC relative to BC at remote sites receiving long-range transported BC.
黑碳（BC）对大气变暖及冰川融化有显著影响。然而，不同燃料源产生的黑碳在大气中的寿命仍存在很大的不确定性。通过分析在青藏高原一个偏远站点采集的三年期颗粒物（PM）和降水样本中的黑碳ΔC，我们发现，颗粒物中来自化石燃料的黑碳（BC）的季节变化比来自南亚和排放清单中的黑碳更大。降水导致化石燃料燃烧源黑碳（BC）和生物质燃烧源黑碳（BC）之间出现分馏，使得雨季时BC增加至68±7%，这显著高于在南亚一个背景站点及同时采集的降水样本中测得的水平。我们的研究结果提供了直接证据，表明季风季节中BC的寿命比BC更长。这些结果强调了在接收远距离传输黑碳的偏远站点，相对于BC，BC对气候的强迫作用增强。
