DOORS-2 Open Sea Survey in Western Black Sea, 2023 - Cruise 2 / Leg2 (10th - 20th September 2023, MN248) : Underway GHG (CH4 and CO2) investigation

Here, we present the underway GHG (CH4 and CO2) measurements data of MN249 cruise on board of R/V Mare Nigrum in early autumn of 2023. The underway methane and CO2 measurements were performed using a cavity ring-down spectroscopy (CRDS)- Picarro G2301- gas analyzer coupled to a custom made air-water equilibrator system (AWES - Amiston Ltd. Air Water Equilibration System) based on a 3M™ Liqui-Cel™ membrane contractor and a water system feed. Also, in support for disolved CH4 and CO2 calculations we used a system for sea surface temperature and  salinity monitoring and a meteo staion. During this cruise we covered part of the south Romanian sector and part of north Bulgarian sector and was done in the framework of Doors project (10th - 20th September,2023).  This study was supported by the European Union H2020 project DOORS, grant agreement no. 101000518