The main source of the biogenic sulphur flux from the oceans to the atmosphere is the production of dimethylsulphide (DMS) in the euphotic zone. It has been suggested that DMS plays an important role in regulating the climate, through the formation of aerosols, which can act as cloud condensation nuclei (The CLAW hypothesis). However, climatic effects (via solar radiation) on DMS are complex. Photosynthetically active radiation (PAR) and ultraviolet radiation (UV) have positive and negative effects on DMS production. In particular, UV radiation can depress DMS production through DNA damage in phytoplankton species and photochemical removal of DMS to other photolysis products. Conversely, UV can act to inhibit the biological removal of both DMSP and DMS. In this study we investigate the net effect of UV radiation on atmospheric DMS using a 10-year record of observed DMS at Amsterdam Island in the southern Indian Ocean, in conjunction with satellite based retrievals of surface UV and PAR. Using composite analysis of days of high and low UV events we have attempted to isolate the influence of UV from other meteorological factors including wind speed and PAR. Results show that anomalously high (low) UV radiation is associated with low (high) atmospheric DMS. This may confirm pervious laboratory studies. These results are discussed in the context of stratospheric ozone depletion over the last two decades and the attendant increases in surface UV radiation