The CTD data were acquired when the RMT instrument was in the water. Data Acquisition: There is a FSI CTD sensor housed in a fibreglass box that is attached to the top bar of the RMT. The RMT software running in the aft control room establishes a Telnet connection to the aft control terminal server which connects to the CTD sensor using various hardware connections. Included are the calibration data for the CTD sensor that were used for the duration of the voyage. The RMT software receives packet of CTD data and every second the most recent CTD data are written out to a data file. Additional information about the motor is also logged with the CTD data. Data are only written to the data file when the net is in the water. The net in and out of water status is determined by the conductivity value. The net is deemed to be in the water when the conductivity averaged over a 10 second period is greater than 0. When the average value is less than 0 the net is deemed to be out of the water. New data files were automatically created for each trawl. Data Processing: 1. Adjustment of the net open time. If the net did not open when first attempted then the net was 'jerked' open. This meant the winch operator adjusted the winch control so that it was at maximum speed and then turned it on for a very short time. This had the effect of dropping the net a short distance very quickly. This dislodges the net hook from its cradle and the net opens. The scientist responsible for the trawl would have noted the time in the trawl log book that the winch operator turned on the winch to jerk the net. The data files will have started the 'net open' counter 10 seconds after the user clicks the 'Net Open' button. If this time did not match the time written in the trawl log book by the scientist, then the net open time in the CSV file was adjusted. The value in the 'Net Open Time' column will increment from the time the net started to open to the time that the net started to close. The pressure was also plotted to ensure that the time written down in the log book was correct. When the net opens there is a visible change in the CTD pressure value received. The net 'flies' up as the drag in the water increases as the net opens. If the time noted was incorrect then the scientist responsible for the log book, So Kawaguchi, was notifed of the problem and the data file was not adjusted. 2. Removing unused columns from the original log files. The original log files that were produced by the RMT software were trimmed to remove any columns that did not pertain to the CTD data. These columns include the motor information and the ITI data. The ITI data gives information about the distance from the net to the ship but was not working for the duration of the BROKE-West voyage. This trimming was completed using a purpose built java application. This java class is part of the NOODLES source code. Dataset Format: The dataset is in a zip format. There is a .CSV file for each trawl, 125 in total. There were 51 Routine trawls and 74 Target Trawls. The file naming convention is as follows: [Routine/Target]NNN-rmt-2006-MM-DD.csv Where, NNN is the trawl number from 001 to 124. MM is the month, 01 or 02 DD is the day of the month. Also included in the zip file are the calibration files for each of the CTD sensors and the current documentation on the RMT software. Each CSV file contains the following columns: Date (UTC) Time (UTC) Ship Latitude (decimal degrees) Ship Longitude (decimal degrees) Conductivity (mS/cm) Temperature (Deg C) Pressure (DBar) Salinity (PSU) Sound Velocity (m/s) Fluorometer (ug/L chlA) Net Open Time (mm:ss) If the net is not open this value will be 0, else the number of minutes and seconds since the net opened will be displayed. When the user clicks the 'Net Open' button there is a delay of 10 seconds before the net starts to open. The value displayed in the 'Net Open Time' column starts incrementing once this 10 seconds delay has passed. Similarly when the user clicks the 'Net Close' button there is a delay of 6 seconds before the net starts to close. Thus the counter stops once this 6 seconds has passed. Acronyms Used: CTD: Conductivity, Temperature, Pressure RMT: Rectangular Midwater Trawl CSV: Comma seperated value FSI: Falmouth Scientific Inc ITI: Intelligent Trawl Interface This work was completed as part of ASAC projects 2655 and 2679 (ASAC_2655, ASAC_2679).

Metadata record for data from ASAC Project 2381 See the link below for public details on this project. ---- Public Summary from Project ---- This project will compare sea ice electrical conductivities measured in-situ over lateral scales of tens of metres with those determined by small-scale laboratory measurements on core samples. These measurements will be used to determine appropriate bulk sea ice conductivities for interpretation of sea ice thickness from electromagnetic sounding data. Data collection for this project took place on voyage 1 of the Aurora Australis in the 2003/2004 season. A word document thoroughly detailing the project and the data are included in the download file. The fields in this dataset are: Latitude Longitude Time Date Conductivity Temperature

This dataset contains CTD (conductivity, temperature, depth) and nutrient (nitrate, nitrite, phosphate, silicate, manganese) data obtained from the Antarctic Division BIOMASS Experiment III (ADBEX III) cruise of the Nella Dan, during Sep - Dec 1985. This cruise is the fifth cruise out of a series of six, conducting a long term field survey on krill and other zooplankton. 50 CTD casts were taken in the Prydz Bay region, and nutrient data were collected at 25 of the stations. Casts were made to 2000 m or to near bottom over the continental shelf. The oceanographic and nutrient programs were subordinate to other programs and so the locations of the CTD stations were not always ideal for oceanographic purposes. The fields in this dataset are: pressure temperature salinity volume geopotential samples deviation conductivity

Data collected from O'Gorman rocks near Davis Station between February 2004 to January 2005. Data were collected using a Yellow Science Industries 6600 Sonde. Vertical profiles of Temperature, Salinity, Conductivity, Dissolved Oxygen, Photosynthetically Active Radiation were collected. Each Sampling date/time and depths were recorded. The data are stored in spreadsheet form, and saved as a comma separated values text file. This work was carried out as part of ASAC project 40. The fields in this dataset are: Date Time Temperature Conductivity Salinity Dissolved Oxygen Depth Photosynthetically Active Radiation

Oceanographic measurements around the 'BROKE-West' survey area along the Antarctic continental margin between 30 degrees and 80 degrees south were conducted aboard Aurora Australis cruise au0603 (voyage 3 2005/2006, 2nd January to 12th March 2006). A total of 120 CTD vertical profile stations were taken, most to within 15 m of the bottom. Over 2500 Niskin bottle water samples were collected for the measurement of salinity, dissolved oxygen, nutrients (phosphate, nitrate+nitrite, silicate and ammonia), 18O, dissolved inorganic carbon, alkalinity, particulate organic carbon/nitrogen/silicate, dimethyl sulphide, and biological parameters, using a 24 bottle rosette sampler. Full depth current profiles were collected by an LADCP attached to the CTD package, while near surface current profile data were collected by a ship mounted ADCP. Data from the array of ship's underway sensors are included in the data set. This report describes the processing/calibration of the CTD and ADCP data, and details the data quality. An offset correction is derived for the underway sea surface temperature and salinity data, by comparison with near surface CTD data. LADCP data are not discussed in this report. Note that the data processor was not a cruise participant, thus this report does not describe all details of the shipboard field data collection or the problems encountered. CTD station positions are shown in Figures 1a and b, while CTD station information is summarised in Table 1. Niskin bottle sampling at each station is summarised in Table 2. (see word document detailed below for figures and tables) Further information is available in a word document available as part of the download. This work was completed as part of ASAC projects 2655 and 2679 (ASAC_2655, ASAC_2679).

Antarctic marine diatoms are sensitive to environment change. This project will determine the environmental niches occupied by key diatom species in Antarctic sediments. This will allow climate changes in the past to be interpreted from Holocene sediments and future changes in diatom biogeography to be predicted. Environmental manipulation and competition experiments using diatoms will identify the response of key taxa to environment modification. Understanding the environmental factors governing their distribution and natural variability will provide a basis to interpret palaeo-environment records, and allow predictions how this temperature-sensitive ecosystem will respond to future change. Diatoms for the experiments were collected in 2002 (Aurora Australia, Voyage 1) and 2003 (Aurora Australis, Voyage 1). On each occasion water from the ship's online seawater tap was filtered through a 20 micrometre plankton net for up to one hour into a sample jar. A portion of the sample was preserved in lugol's iodine for later phytoplankton analysis, and the rest of the sample maintained alive in the dark in seawater at a constant low temperature. The live sample is maintained at the AAD for culturing and environment manipulation and competition experiments. Project 2302 Twenty-two water samples were collected from 24/10/02 to 11/11/02, in open seawater between 53 degrees 50 degrees S and 65 degrees 50 degrees S. At each site, the following were recorded from the ship's data logger: latitude, longitude, date, UCT time, local time, water depth, salinity, water temperature, chlorophyll A, UV radiation, and conductivity.

This dataset contains locations of sampling sites for ASAC project 40 on voyage 3 of the Aurora Australis in the 2004/2005 season. Samples were collected between December and February of 2004/2005. It also contains information on chlorophyll, carotenoids, coccolithophorids and species identification and counts. Public Summary from the project: This program aims to determine the role of single celled plants, animals, bacteria and viruses in Antarctic waters. We quantify their vital role as food for other organisms, their potential influence in moderating global climate change through absorption of CO2 and production of DMS, and determine their response to effect of climate change. For more information, see the other metadata records related to ASAC project 40 (ASAC_40). There are three spreadsheets in this download file - one for the CLIVAR I9 transect, and another for a survey in the region of the Princess Elizabeth Trough. A third spreadsheet contains pigment data. Each spreadsheet contains several worksheets. PET - CTD Station details, CTD profiles, CTD Surface Samples. I9 - CTD Station details, CTD profiles, CTD Surface Samples, Transect Surface Samples. CLIVAR_CTD_Pigs_CHEMTAX - Pigment data: Concentrations of various pigments (ug/L) analysed by HPLC (see protocol); Interpretation: Interpretation of pigment data using CHEMTAX to estimate the amount (ug/L) of chlorophyll a present in a range of algal types. There is also a word document detailing some of the HPLC procedures used. The fields in this dataset are: Station Latitude Longitude Time (Universal Time) Sounder depth Sounder offset Bottles Depths (dB) Label Fmax Tmin HPLC Fluorescence FCM Visc/TEP Phyto ID Lugols Glut Bacteria Water Temperature Salinity Conductivity Net Sample Depth (m) Species Chlorophyll a Pigments HPLC

Environmental manipulation and competition experiments on cultured and natural diatoms will identify the response of key taxa to environment modification. Understanding the environmental factors governing diatom distribution and natural variability will provide a basis to interpret palaeo-environment records, and allow predictions how this temperature-sensitive ecosystem will respond to future change. Environmental manipulation and competition experiments using diatoms will identify the response of key taxa to environment modification. Understanding the environmental factors governing their distribution and natural variability will provide a basis to interpret palaeo-environment records, and allow predictions how this temperature-sensitive ecosystem will respond to future change. Diatoms for the experiments were collected in 2002 (Aurora Australia, Voyage 1) and 2003 (Aurora Australis, Voyage 1). On each occasion water from the ship's online seawater tap was filtered through a 20 micrometre plankton net for up to one hour into a sample jar. A portion of the sample was preserved in lugol's iodine for later phytoplankton analysis, and the rest of the sample maintained alive in the dark in seawater at a constant low temperature. The live sample is maintained at the AAD for culturing and environment manipulation and competition experiments. Project 2364 Twelve water samples were collected from 23/10/03 to 27/10/03, in open seawater between 60 degrees 45' S and 50 degrees 02' S. At each site, the following data were recorded from the ship's data logger: latitude, longitude, UTC time, local time, water depth, salinity, water temperature, fluorescence, UVB, and conductivity.

This dataset contains CTD (conductivity, temperature, depth) and nutrient (nitrate, phosphate, silicate) data obtained from the Antarctic Division BIOMASS Experiment I (ADBEX I) cruise of the Nella Dan, during Nov - Dec 1982. This cruise is the second in a series of six, conducting a long term field survey of krill and other zooplankton. 79 CTD casts were taken in the Prydz Bay region, and nutrient data were collected at 28 out of the 79 CTD stations. Casts within the shelf zone were made to the bottom and down to 2000 m offshore. Oceanographic sampling was subordinate to other programs such as the phytoplankton survey, hence the locations of the CTD stations were not always ideal for oceanographic purposes. Nutrient samples were collected to provide information for the interpretation of phytoplankton distribution and abundance. The fields in this dataset are: Pressure temperature salinity volume geopotential samples deviation conductivity

Metadata record for data from ASAC Project 1342 See the link below for public details on this project. ---- Public Summary from Project ---- This project involves field trialling of software written as part of ASAC project 1212 (2000-2001) to determine sea-ice thickness in real-time from ship-borne electromagnetic induction measurements. Computer simulation of ship- and helicopter-borne electromagnetic induction measurements over realistic sea-ice structures will also be performed in order to assess the suitability and cost-effectiveness of helicopter-mounted systems for future Antarctic sea-ice thickness measurements. Equipment used in this study were the IBEO PS100 infrared laser altimeter and the Geonics EM31 geophysical electromagnetic induction device. The fields in this dataset are: DAY is Julian day TIME is in seconds after midnight (UTC). LASER is the laser altitude above the snow/ice (metres). A zero reading indicates no return (open water). PITCH is pitch of the system in degrees. ROLL is roll of the system in degrees. COND-A is analogue conductivity from the EM31 (not used). PHASE-A is analogue in-phase response from the EM31 (not used). COND is the estimated depth to seawater (metres) from the EM31-ICE processing module. PHASE is the EM31 in-phase response (expressed as parts per thousand of the primary field). A value of 9.99 indicates the magnetic field was too large to be recorded. SITE LATITUDE LONGITUDE SNOW THICKNESS ICE THICKNESS FREEBOARD a is the electrode spacing. R is the measured resistance. Rho is the apparent conductivity (not true conductivity) = 2 aR. CONDUCTIVITY = 1/Rho.