Long 1, midchain alkane-diols have been analyzed from sediment trap CBeu (off Mauritania) samples collected from 2003-2008 (CBeu1-5). The changes in diol composition and diol indices have been compared with changes in environmental parameters. New and hardly available data are deposited here. These include the diol flux data, the corrected UK'37 record, the relative abundances of upwelling indicating species and the 11 years moving average of wind speed and direction from Nouadhibou Airport. Data that are readily available from the World Ocean Atlas 2018, NOAA and earlier publications on CBeu have not been deposited here. These include solar insolation, sea surface temperatures, as well as water temperature, salinity and phosphate for different water depths.