Glider-based observations of CO<sub>2</sub> in the Labrador Sea

Abstract. Ocean gliders can provide high-spatial- and temporal-resolution data target specific ocean regions at a low cost compared to ship-based measurements. An important gap, however, given the need for carbon measurements, is lack of capable sensors glider-based CO2 We develop robust methods evaluate novel gliders. Here we present results from testing performance optode sensor (Atamanchuk et al., 2014), deployed on Slocum glider, in Labrador Sea Newfoundland Shelf. This paper (1) investigates two glider deployments, (2) demonstrates utility using autonomous SeaCycler profiler mooring (Send 2013; Atamanchuk 2020) improve situ data, (3) presents moored mobile platforms resolve fine scales temporal spatial variability O2 pCO2 Sea. The Aanderaa an early prototype that has not undergone rigorous but compact uses little power. Our analysis shows suffers instability slow response times (τ95>100 s), affected by different behavior when profiling through small (<3 ∘C) vs. large (>10 changes temperature over similar time intervals. compare observations estimate uncertainty as ± 6.14 44.01 µatm, respectively. From mission, point short timescales (<7 d) distance (<15 km) drivers change this region.