氧化溴（BrO）在极地和海洋边界层化学过程和生物地球化学循环中起着十分重要的作用，但BrO在大陆中低纬度地区的浓度分布及其对全球对流层化学的影响，目前还不十分清楚。在大气BrO柱浓度和垂直分布的监测方面，多轴差分吸收光谱仪(Multi-Axis Differential Optical Absorption Spectroscopy，简称MAX-DOAS)一直扮演着主要角色。本项目拟在中国科学院纳木错多圈层综合研究观测站和中国气象局瓦里关大气本底基准观象台两个站点，开展为期一年的MAX-DOAS地基遥感观测，研究我国青藏高原地区上空对流层BrO的浓度水平、垂直分布和季节变化特征，以及高原盐（咸）水湖对对流层BrO的影响。项目研究有益于进一步揭示全球对流层BrO的来源、分布和形成机制，推动我国在大气成分地基遥感观测和对流层卤素化学方面的研究进展，提高我国在全球大气化学研究领域的国际影响。

Bromine oxide (BrO) plays an important role in tropospheric chemistry as well as biogeochemical cycles. However, the distribution of BrO in the mid- and lower- latitudes over the continents and its effects on tropospheric chemistry at global scales are not yet completely understood. The Multi-Axis Differential Optical Absorption Spectroscopy instruments (MAX-DOAS) have been widely used to retrieve the columns and vertical distributions of BrO in the atmosphere. Under this project, we plan to carry out one-year ground-based MAX-DOAS measurements at the two stations of the Tibetan plateau,the Nam Co Station for Multisphere Observation and Research of CAS and the Waliguan Global Atmosphere Watch Baseline Observatory of CMA. We will investigate the levels, vertical distributions and seasonal variations and the effects of salt lakes on tropospheric BrO over the plateau. Our research is expected to make a contribution to the understanding of the sources, distributions and formation mechanisms of tropospheric BrO at global scales. The project can also stimulate a promotion in the fields of atmospheric composition remote sensing and tropospheric halogen chemistry in China and thus increase the reputation of Chinese scientists in international global atmospheric chemistry community.