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The Rann of Kutch (India and Pakistan)is one of the largest salt deserts in the world. Being a so-called "seasonalsalt marsh", it is regularly flooded during the Indian summer monsoon. Wepresent 10 years of bromine monoxide (BrO) satellite observations by theOzone Monitoring Instrument (OMI) over the Great and Little Rann of Kutch.OMI spectra were analysed using Differential Optical AbsorptionSpectroscopy (DOAS) and revealedrecurring high BrO vertical column densities (VCDs) of up to1.4  ×  10<sup>14</sup> molec cm<sup>−2</sup> during April/May, but no significantly enhancedcolumn densities during the monsoon season (June–September). In thefollowing winter months, the BrO VCDs are again slightly enhanced while thesalty surface dries up. We investigate a possible correlation of enhancedreactive bromine concentrations with different meteorological parameters andfind a strong relationship between incident UV radiation and the total BrOabundance. In contrast, the second Global Ozone Monitoring Instrument(GOME-2) shows about 4 times lower BrO VCDs over the Rann of Kutch than foundby OMI and no clear seasonal cycle is observed. One reason for this findingmight be the earlier local overpass time of GOME-2 compared to OMI (around09:30 vs. 13:30 LT), as the ambient conditions significantly differ for bothsatellite instruments at the time of the measurements. Further possiblereasons are discussed and mainly attributed to instrumental issues. OMIadditionally confirms the presence of enhanced BrO concentrations over theDead Sea valley (Israel/Jordan), as suggested by former ground-basedobservations. The measurements indicate that the Rann of Kutch salt marsh isprobably one of the strongest natural point sources of reactive brominecompounds outside the polar regions and is therefore supposed to have asignificant impact on local and regional ozone chemistry

Seasonal variation of tropospheric bromine monoxide over the Rann of Kutch salt marsh seen from space