Biogeochemical and hydrographic data collected using the autonomous surface vehicle C-worker 4 in Belize - 2019.

Data were collected to obtain high-resolution surface hydrography and biogeochemistry measurements from the Belize river mouth out to the barrier reef using the autonomous surface vehicle (ASV) C-worker 4. The data were collected with the aim to understand and unpick controls on biogeochemistry of Belize's coastal zone and the influence of the river. Data were collected in October 2019 over five days, with five transects - during daylight hours, with the aim of capturing wet season influence of the river, however Belize experienced a drought. Data collection was planned by Sarah Cryer and Filipa Carvalho and collected in country by Sarah with technical assistance provided by Terry Wood and James Strong. The payload deployed comprised of sensors for conductivity, temperature, depth (CTD), dissolved oxygen (DO), pH, nitrate, chlorophyll fluorescence, Coloured Dissolved Organic Matter (CDOM), Turbidity, Dissolved Organic Carbon (DOC) and current profiling. The payload is lowered out of the bottom of the vehicle, which is set on transects and all sensors are flow through. If required, data has been compensated for temperature, salinity and/or pressure, and calibrated using manufacturer provided equations, but has not been calibrated using bottle data. Data was collected as part of the Commonwealth Marine Economies Programme Belize (CMEP Belize). The ASV C-worker 4 and all sensors are part of the CMEP Containerised Autonomous Marine Environmental Laboratory (CAMEL) facility.