Nitrogen dominates global atmospheric organic aerosol absorption.

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Science Pub Date : 2025-02-28 Epub Date: 2025-02-27 DOI:10.1126/science.adr4473

Yumin Li, Tzung-May Fu, Jian Zhen Yu, Aoxing Zhang, Xu Yu, Jianhuai Ye, Lei Zhu, Huizhong Shen, Chen Wang, Xin Yang, Shu Tao, Qi Chen, Ying Li, Lei Li, Huizheng Che, Colette L Heald

引用次数: 0

Abstract

Atmospheric organic aerosols (OAs) influence Earth's climate by absorbing sunlight. However, the link between their evolving composition and their absorptive effects is unclear. We demonstrate that brown nitrogen (BrN), the absorptive nitrogenous component of OAs, dominates their global absorption. Using a global model, we quantified BrN abundance, tracked its optical evolution with chemical aging, and assessed its radiative absorption. BrN contributes 76% of OAs' surface light absorption over the US and 61% of their global absorptive optical depth. Moreover, the observed variability of OAs' absorptive capacity is primarily driven by the sources and aging of BrN. BrN represents 18% of the global absorptive direct radiative effect of carbonaceous aerosols, with biomass burning being the largest contributor. Our research establishes a nitrogen-centric framework for attributing the climate impacts of OAs.

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氮在全球大气有机气溶胶吸收中占主导地位。

大气有机气溶胶（OAs）通过吸收阳光影响地球气候。然而，它们的进化组成和吸收作用之间的联系尚不清楚。研究结果表明，褐色氮（brown nitrogen, BrN）是oa的吸收性氮组分，在它们的全球吸收中占主导地位。利用全球模型，我们量化了BrN丰度，跟踪了其随化学老化的光学演变，并评估了其辐射吸收。BrN占美国oa表面光吸收的76%，占其全球吸收光学深度的61%。此外，观测到的oa吸收能力的变化主要由BrN的来源和老化驱动。BrN占碳质气溶胶全球吸收直接辐射效应的18%，其中生物质燃烧是最大的贡献者。我们的研究建立了一个以氮为中心的框架来归因于oa的气候影响。

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

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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