Longer Lifetime of BC from Fossil Fuel Combustion than from Biomass Burning: Δ14C Evidence

IF 11.3 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

环境科学与技术 Pub Date : 2025-02-25 DOI:10.1021/acs.est.4c10040

Chaoliu Li, Zhaofu Hu, Shichang Kang, Elena N. Kirillova, Fangping Yan, Pengfei Chen, Guofeng Shen, Thompson T. Jake, Örjan Gustafsson

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Abstract

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 Δ¹⁴C of BC in PM_2.5 and precipitation samples collected for three years at a remote site in the Tibetan Plateau, we found that BC from fossil fuel contribution (f_fossil BC) in PM_2.5 exhibited greater seasonal variation than those from South Asia and emission inventories. Precipitation-induced fractionation between fossil fuel combustion-derived BC (BC_ff) and biomass burning-derived BC (BC_bb) resulted in an increase of f_fossil 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_ff is longer than that of BC_bb during the monsoon season. These results emphasize the increased climate forcing of BC_ff relative to BC_bb at remote sites receiving long-range transported BC.

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化石燃料燃烧比生物质燃烧产生的BC寿命更长：Δ14C证据

黑碳（BC）对大气变暖和冰川融化有显著贡献。然而，来自不同燃料来源的BC的大气寿命仍然没有得到很好的限制。通过分析PM2.5中BC的Δ14C和青藏高原偏远地区3年的降水样本，我们发现PM2.5中来自化石燃料贡献（化石BC）的BC比来自南亚和排放清单的BC具有更大的季节变化。降水引起的化石燃料燃烧衍生BC （BCff）和生物质燃烧衍生BC （BCbb）之间的分馏导致化石BC在潮湿季风季节增加到68±7%，这明显高于南亚背景站点和同时收集的降水样本的水平。我们的研究结果为季风季节bcbff的寿命比BCbb的寿命更长提供了直接证据。这些结果强调了在接收远距离输送的BC的偏远站点，相对于BCbb， BCff的气候强迫增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

环境科学与技术环境科学-工程：环境

CiteScore

17.50

自引率

9.60%

发文量

12359

审稿时长

2.8 months

期刊介绍： Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.