GOME Observations of Tropospheric BrO in Northern

• Main Authors: Hemispheric Spring, Andreas Richter, Folkard Wittrock, Michael Eisinger, John P. Burrows
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic; Hudson; Hudson Bay
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.476.5667; http://gome1.physik.uni-bremen.de/doas/paper/grl_98_richter.pdf

Abstract. Measurements from the Global Ozone Monitor-ing Experiment GOME have been analysed for tropospheric BrO in the northern hemispheric spring and summer 1997. Tropospheric excess columns have been determined by sub-tracting measurements from a longitude range which is as-sumed to represent background conditions. From February until the end of May enhanced tropospheric BrO columns are observed over the Hudson Bay area and parts of the Canadian Arctic. This large and persistent event has not been reported before and can only be explained by a large local source of bromine. In addition, from March to May other smaller and shorter tropospheric BrO events are de-tectable along the coast lines of the Arctic Sea and over the polar ice. They correspond to the ground-based observa-tions of enhanced tropospheric BrO reported from several stations in the high Arctic.