ASITs experiments data for the 2023 POLAR-CHANGE campaign

This file contains data from the February-March 2023 PolarChange campaign on board of the RV Hesperides. Expriments were leads in two Air-Sea Interface Tanks (ASITs) installed on deck and connected to a set of air analysis instruments. One of the ASITs was covered by a lid blocking UV radiation. Clean filtered air is continuously flushing the ASITs with a residence time of 40 minutes. Local seawater was either continuously introduced in half of the ASIT volume or stocked for several days. More details are available on Chamba et al. (submitted). The methodology of these ASITs experiments is described in Sellegri et al. (2023).

Local_time is from Punta Arenas, Chile (UTC-3)

The first columns presents data from the ship (lon; lat; wind speed and direction, air temperature and water temperature and salinity). 

Others measurements were done close to the Air-Sea-Interface-Tanks (ASITs) experiments with radiation and air temperature and humidity inside the ASITs. 

The same instrument set including QPTR-MS, various CPC, PSM and Ozone analyser was used for both ASITs, flushing air (filtered) and ambient air, monitored by a 4-way valve switching every 20 minutes.

Position of the valve is indicated in columb valve_pos, 1= Control-ASIT, 2=Flushing-air, 3= noUV-ASIT, 4= Ambient-air