Temperature logger data from sediments and low water masses collected on the Denman Marine Voyage of the RSV Nuyina, 2025

These data were collected on voyage 3 of the RSV Nuyina in the 2024/2025 season. The voyage was colloquially known as the "Denman Marine Voyage", as it operated in the vicinity of the Denman Glacier.
During voyage NUY202425080 to the region offshore the Denman glacier, miniature temperature loggers (MTLs) were deployed on kasten core and multicore deployments to record temperatures in the sediment and lowermost water masses. Probes were calibrated on CTD deployments twice during the voyage. The goal was to measure in situ temperatures while the corers were in the seafloor sediments, to understand geological (heat flux) and oceanographic (bottom waters) processes which leave records in the thermal gradient of the sediments below the seafloor.
For a summary of the MTLs used on each deployment see NUY2025_V03_TemperatureProbeDeploymentSummary.xlsx.  For MTL positioning on the corers and CTD see NUY2025_V03_MiniTempProbeDeploymentConfig.pdf.
Probes were attached to the corers so that MTLs with smaller ID numbers were at the top of the corer and larger ID numbers at the bottom.
Temperature records were recovered from kasten core (KCXX), and multicore (MCXX) deployments during the voyage (where XX is the sequential deployment number). No temperatures were recorded during multicore deployments 02 or 12. The topmost sensors failed on KC01 and MUC04 and data failed to download from the topmost MTL on KC06.
Data is recorded under the deployment record number e.g. Kasten Core 01 data is in KC01 folder. Raw data from the MTL and winch is in the RawData folder.
Data for each MTL was downloaded in the native WinTemp format (.wtf) and exported to a text file (.dat). MTL data were recorded with times in Australian Eastern Standard Time (AEST) and note that there was a switch from daylight saving time to standard AEST on April 6. The MTLs logged time and temperature only, so depths, and the period when the probes were in or on the seafloor need to be extracted from the winch wire out data. This is in KCXX_winchout.csv file, which has times in UTC.
The MTLs were each calibrated twice during the voyage, during a CTD deployment, so temperature drift per instrument could be measured against the two CTD temperature loggers. These data can be found under Calibration/CTDXX, where XX refers to the CTD deployment number.
In the case of the kasten core measurements, to enable conversion of temperature gradients to heat fluxes, the thermal conductivity of the kasten core sediments were measured in 20 cm intervals. These records can be found in the kasten core records.

Tags: AMD, AMD/AU, CEOS, CONTINENT > ANTARCTICA > DENMAN GLACIER, DENMAN, DMV, EARTH SCIENCE > OCEANS > MARINE SEDIMENTS, EARTH SCIENCE > OCEANS > MARINE VOLCANISM > BENTHIC HEAT FLOW, EARTH SCIENCE > OCEANS > OCEAN HEAT BUDGET > HEAT FLUX, EARTH SCIENCE > OCEANS > OCEAN HEAT BUDGET > HEAT FLUX > GEOTHERMAL HEAT FLUX, EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE, EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENT CORE, EARTH SCIENCE > SOLID EARTH > GEOTHERMAL DYNAMICS > GEOTHERMAL TEMPERATURE, GEOGRAPHIC REGION > POLAR, OCEAN > SOUTHERN OCEAN > EAST ANTARCTIC CONTINENTAL SHELF, R/V Nuyina > R/V Nuyina, SEDIMENT CORERS > SEDIMENT CORERS, TEMPERATURE LOGGERS > TEMPERATURE LOGGERS
Organization: Australian Ocean Data Network