Bromine monoxide (BrO) measurements made using a MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy) instrument in the austral summer of 2016/17 during the Antarctic Circumnavigation Expedition (ACE).

<strong>Dataset abstract</strong> To achieve the objectives of the project, we installed a MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy) instrument on the vessel “Akademik Tryoshnikov”. This instrument is based on the DOAS technique, which is used to measure trace gas concentrations in the atmosphere. The method consists of the analysis of the spectral absorption lines that each trace gas produces in the solar spectra. The DOAS technique uses the narrowband features that every trace gas has in their spectral absorption coefficients. This differential cross section is unique and acts like a fingerprint for the trace gases, allowing to differentiate between them and to estimate their concentrations (for further details see Platt and Stutz, 2008). In the past decades, atmospheric chemists have come to realize that halogen species (like Cl, Br or I and their oxides ClO, BrO and IO) exert a powerful influence on the chemical composition of the troposphere and through that influence affect the evolution of pollutants, hence having a significant impact on climate. These reactive halogen species are potent oxidizers for organic and inorganic compounds throughout the troposphere. In particular, halogen cycles can act on several compounds (such as methane, ozone, particles…), all of which are climate forcing agents through direct and indirect radiative effects. Dynamic exchange of halogens between ocean, sea ice, snowpack and atmosphere is the main driver for the frequent occurrence of Ozone Depletion Events (ODEs) and Atmospheric Mercury Depletion Events (AMDEs) (Saiz-Lopez and von Glasow, 2012). In this dataset we present the mixing ratio and vertical column density of bromine monoxide (BrO) recorded in the austral summer of 2016/2017 in the Southern Ocean and Atlantic Ocean, averaged over one-hour time periods. <strong>Dataset contents</strong> ace_bromine_monoxide_atmospheric_measurements.csv, data file, comma-separated values data_file_header.txt, metadata, text README.pdf, metadata, PDF/A-1a README.txt, metadata, text <strong>Dataset license</strong> This dataset of atmospheric bromine monoxide measurements from ACE is made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full text can be found at https://creativecommons.org/licenses/by/4.0/数据集摘要：为达成本项目的研究目标，我们在“Akademik Tryoshnikov”号科考船上搭载了多轴差分光学吸收光谱仪（MAX-DOAS, Multi-AXis Differential Optical Absorption Spectroscopy）。该仪器基于差分光学吸收光谱（DOAS, Differential Optical Absorption Spectroscopy）技术，用于测量大气中的痕量气体浓度。该方法通过分析每种痕量气体在太阳光谱中产生的特征吸收谱线实现检测。DOAS技术利用了每种痕量气体在光谱吸收系数中所具备的窄带特征，该差分截面具有唯一性，可作为痕量气体的“指纹”，以此区分不同气体并估算其浓度（详细信息参见Platt与Stutz 2008年的研究）。 近数十年来，大气化学家逐渐认识到，卤素物种（如氯、溴、碘及其氧化物ClO、BrO与IO）对对流层的化学组成具有显著调控作用，并通过该作用影响污染物的演化过程，进而对气候产生重要影响。这类活性卤素物种是对流层中有机与无机化合物的强氧化剂。具体而言，卤素循环可作用于多种化合物（如甲烷、臭氧、气溶胶颗粒等），而这些化合物均可通过直接与间接辐射效应成为气候强迫因子。海洋、海冰、积雪与大气之间的卤素动态交换，是臭氧耗竭事件（ODEs, Ozone Depletion Events）与大气汞耗竭事件（AMDEs, Atmospheric Mercury Depletion Events）频发的主要驱动因素（参见Saiz-Lopez与von Glasow 2012年的研究）。 本数据集收录了2016/2017年南半球夏季于南大洋与大西洋海域测得的一氧化溴（BrO）混合比与垂直柱密度数据，所有数据均按1小时间隔进行平均处理。 数据集内容： ace_bromine_monoxide_atmospheric_measurements.csv：数据文件，逗号分隔值格式 data_file_header.txt：元数据，文本文件 README.pdf：元数据，PDF/A-1a格式 README.txt：元数据，文本文件 数据集许可： 本数据集收录的ACE大气一氧化溴测量数据，采用知识共享署名4.0国际许可协议（CC BY 4.0）进行发布，协议完整文本可访问https://creativecommons.org/licenses/by/4.0/查看。