Methanethiol and Dimethyl sulfide mole fractions at Weybourne Atmospheric Observatory, UK Summer 2024

Biological activity in the surface ocean leads to emissions of methanethiol (MeSH) and dimethyl sulfide (DMS). Measurements of MeSH in the marine atmosphere are sparse. We present measurements of MeSH and DMS at a coastal site with NOx concentrations up to 24.3 ppb in the United Kingdom during May and June. Winds coming from the seaward (northerly) direction showed a median (25th quantiles) MeSH mole fraction of 15.7 (7.9-26.9) ppt. Mole fractions were generally higher in winds coming from the sea over those from land. The measurements reveal significantly lower MeSH during daytime. Trace gas measurements and meteorological parameters for the study period are also included. Deatails on the dataset are included in the "READ ME" file.