The ship campaign MSM114/2 (ARC) with the German research vessel Maria S. Merian took place from 22 January to 23 February, 2023. The campaign started in Mindelo, Cape Verde, and ended in Punta Arenas, Chile. During the campaign, the Intertropical Convergence Zone (ITCZ) was completely crossed three times at an almost constant longitude of 23˚W yielding three profiles of the ITCZ. Afterwards, a storm was passed in the Roaring Forties, in the South Atlantic. Here, we present data from the Microtops as part of a series of standardised data sets of the atmospheric and oceanographic observations gathered during the ARC campaign.These data are republished from the Maritime Aerosol Network (MAN): https://aeronet.gsfc.nasa.gov/new_web/maritime_aerosol_network_v3.html. We present here the series level 2 data processed by MAN for the aerosol optical thickness at 380, 440, 500, 675, and 870 nm, the Angstrom exponent, and the column-integrated water vapour.