Seasonal, regional and vertical characteristics of high carbon monoxide plumes along with their associated ozone anomalies as seen by IAGOS between 2002 and 2019

IF 5.2 1区地球科学 Q1 ENVIRONMENTAL SCIENCES

Atmospheric Chemistry and Physics Pub Date : 2024-01-15 DOI:10.5194/egusphere-2023-2949

Thibaut Lebourgeois, Bastien Sauvage, Pawel Wolff, Béatrice Josse, Virginie Marécal, Yasmine Bennouna, Romain Blot, Damien Boulanger, Hannah Clark, Jean-Marc Cousin, Philippe Nedelec, Valérie Thouret

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引用次数: 0

Abstract

Abstract. In-situ measurements from IAGOS are used to characterise extreme values of carbon monoxide (CO) in the troposphere between 2002 and 2019. The SOFT-IO model, combining the FLEXPART lagrangian dispersion model with emission inventories over the footprint region is used to identify the origins of the CO in the sampled plumes. The impact of biomass burning and anthropogenic emissions on such CO plumes are characterised through CO mixing ratios and simultaneously recorded ozone (O₃) ones. In the Northern Hemisphere, maximum of CO are reached in DJF in the lower troposphere because of the elevated anthropogenic emissions and reduced convective activity of the season. Due to the low photochemistry and the fresh age of the air mass the O₃ values of these plumes are low. CO plumes in the upper troposphere result from intense emissions and efficient vertical transport, peaking during JJA. Among the anomalies detected in the UT in JJA, the ones with the higher associated O₃ values are the ones associated with biomass burning emissions. The middle troposphere combines the two previous vertical levels with contributions from both local emissions and long-range transport. The emission regimes and meteorological conditions are fundamentally different within the troposphere over Africa. Convection is no longer the limiting factor and the transport of the CO plumes is driven by the ITCZ shift, trade winds and the upper branch of the Hadley cell redistributing the pollution to higher latitudes.

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一氧化碳高羽流的季节、区域和垂直特征，以及 IAGOS 在 2002 年至 2019 年期间观测到的相关臭氧异常现象

摘要。利用 IAGOS 的原位测量来描述 2002 年至 2019 年对流层中一氧化碳（CO）极端值的特征。SOFT-IO 模型结合了 FLEXPART 拉格朗日散布模型和足迹区域的排放清单，用于确定采样羽流中一氧化碳的来源。通过一氧化碳混合比和同时记录的臭氧（O3）混合比，确定了生物质燃烧和人为排放对这些一氧化碳羽流的影响。在北半球，由于人为排放增加和对流活动减少，对流层低层的一氧化碳在 DJF 中达到最大值。由于光化学作用较弱和气团年龄较新，这些羽流的 O3 值较低。对流层上部的 CO 羽流来自高强度的排放和高效的垂直传输，在 JJA 期间达到峰值。在 JJA 期间对流层上部探测到的异常中，O3 值较高的是与生物质燃烧排放有关的异常。对流层中层结合了前两个垂直层次，既有本地排放的贡献，也有长程飘移的贡献。非洲对流层内的排放机制和气象条件有着本质的不同。对流不再是限制因素，CO 烟羽的传输是由 ITCZ 移动、信风和哈德利细胞上支将污染重新分配到更高纬度所驱动的。

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

Atmospheric Chemistry and Physics 地学-气象与大气科学

CiteScore

10.70

自引率

20.60%

发文量

702

审稿时长

6 months

期刊介绍： Atmospheric Chemistry and Physics (ACP) is a not-for-profit international scientific journal dedicated to the publication and public discussion of high-quality studies investigating the Earth''s atmosphere and the underlying chemical and physical processes. It covers the altitude range from the land and ocean surface up to the turbopause, including the troposphere, stratosphere, and mesosphere. The main subject areas comprise atmospheric modelling, field measurements, remote sensing, and laboratory studies of gases, aerosols, clouds and precipitation, isotopes, radiation, dynamics, biosphere interactions, and hydrosphere interactions. The journal scope is focused on studies with general implications for atmospheric science rather than investigations that are primarily of local or technical interest.