Metadata record for data from ASAC Project 133 See the link below for public details on this project. Surface carbon dioxide (CO2) observations are integral to understanding the role of the Southern Ocean in the global carbon cycle, and to developing reliable predictions of biogeochemical responses to altered climatic conditions. Carbon dioxide (CO2) observations made in surface waters of the Australian sector of the Southern Ocean between the years 1991 and 2002 were used to estimate the seasonal variability in the fugacity of CO2 (fCO2) and net air-sea carbon fluxes. The results showed a net annual uptake of CO2 by the surface ocean over the entire region. The greatest seasonal uptake and lowest fCO2 values were observed in Spring/Summer in the sub-Antarctic zone (SAZ: 44 degrees S-50 degrees S) and in the Seasonal Sea-ice Zone (SIZ: south of 62 degrees S). The seasonal maximum in uptake for these regions is consistent with increased phytoplankton biomass and shoaling mixed layers over the Spring/Summer period. The High Nutrient Low Chlorophyll waters between 50 degrees S and 62 degrees S, also had maximum uptake in summer, but less compared to the SAZ and SIZ regions. Winter surface waters were close to or slightly above equilibrium, with respect to atmospheric CO2. The reduced uptake in winter appeared due to deeper mixing, lower biomass, and air-sea CO2 exchange. The highest fCO2 values in Winter were observed under or near the seasonal sea-ice where entrainment of deeper CO2-rich waters and ice cover would maintain high surface fCO2 values. The smallest seasonal amplitude in the surface fCO2 and net air-sea fluxes was found from 51 degrees S to 54 degrees S, a region on the southern edge of the SAZ and between the North sub-Antarctic Front and North Polar Front. The uptake estimates derived from the data were in good agreement with the CO2 flux climatology of Takahashi (2002), except in the SAZ and SIZ where we observed greater and less uptake, respectively. Data for this project are available for download - the dataset consists of a data files, and some excel files, which provide further information about each data file (cruise, dates, etc). Furthermore, the column headings used in the data files are as follows: Cruise - name of the cruise which collected the data Date - UTC Time - in UTC Latitude - decimal Longitude - decimal Sst - Sea Surface Temperature in degrees C Teq - Temperature of surface water at which the CO2 measurement is made. Sal - Salinity Patm - atmospheric pressure in hectopascals Shipspd - ship speed in knots Windspd - wind speed in knots Winddir - wind direction in degrees xCO2 - Mole fraction of CO2 in air (dry) equilibrated with surface water and at equilibrator water temperature xCO2air - Mole fraction of CO2 in atmosphere, dry pCO2 - partial pressure of carbon dioxide in surface water

Ice Stations 1-4 Two Davis weather stations are placed either side of a sea-ice ridge. The closest station to the ship is called 'unit 1', and the further station is 'unit 2'. Each weather station includes an anemometer at 2m, temperature/humidity sensor at 1.6m and solar sensor at 1m. Ice Station 6-8 For the last three stations we assembled the two weather stations onto one mast. This is so we can look at wind profiles and hopefully gain some understanding of wind shear and drag on the ice. Anemometers were set 1m apart at 1m and 2m heights. Temperature/humidity sensors were also set 1m apart. Only one solar sensor was used, at the same height as previous deployments. Additional data information : metadata record 201213001 For convenience, and easy loading of the data into any data processing software, the .csv where pre-processed and variables where stored into new ascii files without extensions. Each ascii file corresponds to a given station and a given mast unit. There are 20 columns, separated by tabs. Content of the files: Column 1 : Day of year [] Column 2 to 7 : Date [YYYY MM DD hh mm ss] Column 8 : Barometric Pressure [hPa] Column 9 : Outside Temperature [C] Column 10 : High Outside Temperature [C] Column 11 : Low Outside Temperature [C] Column 12 : Outside Humidity [%] Column 13 : Dew Point [C] Column 14 : Wind Speed [m/s] Column 15 : High Wind Speed [m/s] Column 16 : Low Wind Speed [m/s] Column 17 : High Wind Direction [degrees with respect to North, e.g. East = 90, South = 180, etc...] Column 18 : Dominant Wind Direction [degrees with respect to North, e.g. East = 90, South = 180, etc...] Column 19 : Solar Radiation [W/m^2] Column 20 : High Solar Radiation [W/m^2] List of raw data files (.csv files): 20120925_IceStation1_Met1.csv 20120925_IceStation1_Met2.csv 20120928_IceStation2_Met1_full.csv 20120928_IceStation2_Met2_full_v2.csv 20121008_IceStation4_Met1.csv 20121008_IceStation4_Met2.csv 20121014_IceStation6_Met1_v2.csv 20121014_IceStation6_Met2.csv 20121019_IceStation7_Met1.csv 20121019_IceStation7_Met2.csv 20121104_station8_Met1_full.csv 20121104_station8_Met2_full.csv List of pre-processed data files (ascii files): 20120925_IceStation1_Met1 20120925_IceStation1_Met2 20120928_IceStation2_Met1_full 20120928_IceStation2_Met2_full_v2 20121008_IceStation4_Met1 20121008_IceStation4_Met2 20121014_IceStation6_Met1_v2 20121014_IceStation6_Met2 20121019_IceStation7_Met1 20121019_IceStation7_Met2 20121104_station8_Met1_full 20121104_station8_Met2_full

Note - these data should be used with caution. The chief investigator for the dataset has indicated that a better quality dataset exists, but the AADC have been unable to attain it for archive. Matlab files containing raw data collected using the program "HC2S3snowwind.CR1" running on Campbell Scientific CR1000 dataloggers. Datalogger "C" was used during all ice stations. On the 8th of October a second mast and logger ("A") were installed on what became the final day of Ice Station 4, and both loggers were deployed at stations 6 and 7, with "C" containing the longer records for each station as it was always installed first and (conditions permitting) left out longer. The sensors on these masts consist of: RM Young "Wind Sentry" Vane and Anemometer set (on top of each mast), no serial numbers Rotronics HC2S3 temperature and relative humidity sensors with standard polyethylene filters Upper sensor, mast "C": s/n 60837541 Lower sensor, mast "C": s/n 60837536 Upper sensor, mast "A": s/n 60837468 Lower sensor, mast "A": s/n 60834204 RM Young "Wind Sentry" anemometers (without vane) at 3 additional elevations on each mast Wenglor YHO3NCT8 photoelectric sensors at 4 heights on each mast. The upper sensor and the third sensor from the top were oriented facing up, while the others faced down. The upper three sensors were purchased in 2012, from a batch of these sensors manufactured in a new Eastern European factory while the lowest sensor on each mast came from a lot purchased in 2007, manufactured in Wenglor's German factory and extensively tested for use in snow. Data contained in these .mat files includes the following variables, with units: Textdates: CSI formatted dates, UTC except for station 2, which was (accidentally) UTC+12 Datenm: Matlab "datenumber", all UTC except for station 2, which is also UTC+12 hours. Battvolt: battery voltage Wptemp: temperature of the Wiring Panel thermister, degrees C Temp 1: air temperature above approximately 50cm, ventilated HC2S3 rotronics sensor, degrees C RH1: relative humidity (WRT water) above approximately 50cm, ventilated HC2S3 rotronics sensor, % Temp 2: air temperature above approximately 200cm, ventilated HC2S3 rotronics sensor, degrees C RH2: relative humidity (WRT water) above 197cm, ventilated HC2S3 rotronics sensor, % Snow1: snow particles per 10second interval at approximately 10cm Snow2: snow particles per 10second interval at approximately 50cm Snow3: snow particles per 10second interval at approximately 100cm Snow4: snow particles per 10second interval at approximately 200cm Wind1: average speed (m/s) at approximately 250cm during 10s interval Wind1max: maximum speed at approximately 250cm during 10s interval Wind2: average speed (m/s) at approximately 100cm during 10s interval Wind2max: maximum speed at approximately 100cm during 10s interval Wind3: average speed (m/s) at approximately 120cm during 10s interval Wind3max: maximum speed at approximately 120cm during 10s interval Wind4: average speed (m/s) at approximately 50cm during 10s interval Wind4max: maximum speed at approximately 50cm during 10s interval WindDir: wind direction at approximately 250cm, degrees, relative to mast orientation (needs correction to true) Measurement heights varied by ice station and by mast being used.

This document describes the deployment of five Ice Mass Balance Buoys (IMBs) and two automatic weather stations. These were primarily deployed on floes 2012103 and 20121029, as well as on helicopter flights (refer to buoy metadata for these). IMBs are labelled WHOI-1 to WHOI-6. WHOI-1 was not deployed and WHOI-3 and WHOI-5 failed and were recovered. TAS-2 was exchanged for WHOI-1 Deployments (successful): TAS-2 deployed on helo flight 20 km from ship WHOI-4 deployed on helo flight 20 km from ship WHOI-6 Deployed next to AWS-1 on ice station 1013 on 11/04 WHOI-2 Deployed next to AWS-2 on ice station 1029 on 11/01 Each AWS record air temp, relative humidity, wind speed and direction, total incident short wave, snow depth, GPS position and snow particles near ground level and at about 1m height. AWS-1 deployed on 1013 AWS-2 deployed on 1029 IMBs record GPS position and temperature in air,snow,ice, and ocean. Sensors also have a heating mode that permit determination of media they are embedded in so that snow and ice thickness can be determined. REFER TO MAKSYM LOGBOOK SCANS FOR MORE DETAILS

Data are automatically and manually collected from a range of sensors on board Australian Antarctic Program vessels. From the 2021-2022 season onwards, this typically means the RSV Nuyina. The RSV Nuyina presently has approximately 90 instruments available to produce data. The instruments that contribute data to a specific dataset can be found in that voyages instrument coverage document. In addition the data from the instruments, the RSV Nuyina can also record data from spaces on the ship such as the containerised laboratories or the Wet Well. The RSV Nuyina also has a science tender which includes four instruments as well. Previous datasets from the Aurora Australis generally comprised only "underway data" - such as weather data, water temperatures, and so on. Data from the Nuyina are much broader in scope and more detailed. For full details for each dataset, see the associated child record. Oceanographic instruments that typically record data continuously throughout RSV Nuyina voyages include the Eco fluorometer, LISST-200X particle size analyser, Phytoflash flurometer, SeaFET pH sensor, SBE38 thermometer, SBE45 thermosalinograph, SBE63 oxygen sensor and the PC02 system. Oceanographic and mapping instruments that typically record data intermittently throughout voyages include the ADCP38, ADCP150, EK80 hull system, EK80 dropkeel system, Hydrophones dropkeel system, MS70 fisheries sonar, Multibeam EM712, Multibeam EM122, TOPAS sub-bottom profiler, SH90 fish finding sonar, sound velocity sensors, Ice Wave Radar and the ISAR infrared sea surface temperature system. Meteorological instruments that typically record data continuously throughout voyages include the WMT700 ultrasonic anemometers, UVB radiometer, CGR3 pyrgeometer, CMP3 global solar radiometer, CUV5 broadband UV radiometer, PQS1 photosynthetically active radiometer, CL31 Ceilometer, HMP155 air temperature and humidity sensor, PWD22 present weather and visibility sensor, PTB330 digital barometer and the all sky imager. Deployable instruments that typically record data intermittently throughout voyages include the XBT, RBR concerto CTD, sound velocity profiler, NUTTS instruments and CTD instruments. Operational and positioning instruments that record data continuously throughout voyages include the Gyro compass, GPS compass, IPMS alarm system and webcams. Operational and positioning instruments that record data intermittently throughout voyages include the winches, USBL, Hydrophones hull system, draught sensor, speedlog, echosounder 50 KHz, echosounder 200 KHz, seapath380 systems, acoustic net monitors, Arc-X radar and the hull stress and ice load monitor.

This dataset contains the Voyage Data from Voyage 2 2021-22 collected during RSV Nuyina’s maiden voyage to Antarctica. This purpose of this voyage was a combination of commissioning trials, ice trials and a resupply voyage. The voyage departed Hobart and visited Davis station, Casey station, and the Vanderford Glacier before returning to Hobart. Throughout the voyage, operations related to ice trials and commissioning the science systems were conducted. As the instruments were commissioned, the data produced was included in the Voyage Dataset. It should be noted that many of the instruments were uncalibrated and, therefore, data recorded from these instruments may be erroneous. Oceanographic instruments that recorded data continuously throughout RSV Nuyina voyages include the Eco fluorometer, LISST-200X particle size analyser, Phytoflash flurometer, SeaFET pH sensor, SBE38 thermometer, SBE45 thermosalinograph and the SBE63 oxygen sensor. Oceanographic and mapping instruments that recorded data intermittently throughout the voyage include the ADCP38, ADCP150, EK80 hull system, EK80 dropkeel system, hydrophones dropkeel system, MS70 fisheries sonar, multibeam EM712, multibeam EM122, TOPAS sub-bottom profiler and the sound velocity sensor drop keel system. Meteorological instruments that record data continuously throughout the voyage include the WMT700 ultrasonic anemometers, UVB radiometer, CGR3 pyrgeometer, CMP3 global solar radiometer, CUV5 broadband UV radiometer, PQS1 photosynthetically active radiometer, CL31 Ceilometer, HMP155 air temperature and humidity sensor, PWD22 present weather and visibility sensor, PTB330 digital barometer and the all sky imager. Deployable instruments that recorded data throughout the voyage include the XBT, RBR concerto CTD, sound velocity profiler, NUTTS instruments and CTD instruments. Operational and positioning instruments that recorded data continuously through the voyage include the gyro compass, IPMS alarm system and webcams. Operational and positioning instruments that recorded data intermittently throughout the voyage include the winches, USBL, hydrophones hull system, draught sensor, speedlog, echosounder 50 kHz, echosounder 200 kHz and seapath380 systems. A list of the instruments used on the voyage is available in the file, "instrument_coverage_202122020.pdf" at the top level of the dataset. To find information on the science systems themselves and the headers for the data please refer to "voyage_202122020_data_description.pdf".

This dataset contains the Voyage Data from voyage 202122050 undertaken by the RSV Nuyina between February 12th and March 27th 2022. The principal objectives of the voyage were to retrieve equipment and exchange personnel from Davis Station, and resupply Macquarie Island Station. The EK80 acoustic instruments, underway oceanographic instruments in the OceanPack system, the ice and wave radar, and meteorological instruments were all run during this voyage. Whole of voyage data from the RSV Nuyina underway instruments. Includes uncontaminated seawater, meteorological, and wave radar data interpolated to 1 minute measurements. Wherever possible, each parameter and its associated unit of measurement complies with the NetCDF Climate and Forecast (CF) Metadata Convention Standard Name Table (Version 29) - “voyage_202122050\underway_merger\netcdf\202122050_1min_all.nc