This record describes gravity data collected on RV Investigator Event voyage IN2014_E04 which departed Hobart on the 26 Nov 2014 and returned to Hobart on the 28 Nov 2014. The gravity meter instrument is a MicroG Lacoste Air-Sea system II. Data are stored in .ENV and .DAT files at CSIRO Oceans and Atmosphere. There are 10 files totalling 78 MB of raw data in this dataset. At wharf, the calibration data can be found in wharf_tie_2014_12_02.TXT Additional information regarding this dataset is contained in the GSM data acquisition and processing report.

This record describes echosounder data collected on RV Investigator voyage IN2014_E04 which departed Hobart on the 26 Nov 2014 and returned to Hobart on the 28 Nov 2014. The Simrad ME70 echosounder was used to acquire water column data in Storm Bay and east of Hobart. Data are stored in Simrad *.raw raw format at CSIRO Oceans and Atmosphere. There are 23 files totalling 20 GB of raw data in this dataset. Additional information regarding this dataset is contained in the GSM data acquisition and processing report.

This record describes multibeam echosounder data collected on RV Investigator Event voyage IN2014_E04 which departed Hobart on the 26 Nov 2014 and returning to Hobart on the 28 Nov 2014. The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry and backscatter information East of Hobart. Ping rate varied according to depth. Data are stored in *.all raw format at CSIRO Oceans and Atmosphere. There are 24 files totalling 0.86 GB of raw data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Tide corrections were not applied to the processed data. Processed data are available in XYZ and GSF format. Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products available on request.

This record describes multibeam echosounder data collected on RV Investigator voyage IN2014_E04 which departed Hobart on the 26 Nov 2014 and returned to Hobart on the 28 Nov 2014. The Kongsberg EM710 multibeam echosounder was used to acquire seafloor bathymetry and backscatter information East of Hobart. Ping rate varied according to depth. Data are stored in *.all raw format at CSIRO Oceans and Atmosphere. There are 50 files totalling 4.89 GB of raw data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Tide corrections were not applied to the processed data. Processed data are available in XYZ and GSF format. Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products available on request.

This record describes Underway (UWY) data collected from the Marine National Facility RV Investigator Event voyage IN2014_E04. This is the third trial voyage for the RV Investigator departing Hobart on the 26th November and returning to Hobart on the 28th November 2014 The overall voyage objectives are to safely develop optimal procedures for servicing deep ocean moorings from RV Investigator including three IMOS Southern Ocean Time Series Moorings. The UWY data from this trial voyage was assessed and will not be processed as the quality is too variable to make it feasible/useful. The unprocessed UWY data is part of the EOV archive and will not be released. Additional information regarding this dataset is contained in the cruise report.

This record describes some Underway (UWY) data collected from the Marine National Facility (MNF) RV Investigator, which are not part of research datasets and have not been processed or quality-controlled. This includes data from most "Gear trials" voyages (identified by the survey name suffix "_eNN"). Underway data from these voyages are usually not processed unless requested. While RV Investigator is at sea, standard Underway data are continuously recorded, consisting of: (1) Navigation data (NAV): Latitude, Longitude, Speed, Heading, Course Over Ground, Gyros, and Doppler Log (dual GPS instrument). (2) Thermosalinograph (TSG): Water Salinity, Flow-Rate, Temperature, Fluorescence, pCO2 and Optode/Oxygen. (3) Atmospheric (MET): Humidity, Wind Speed and Direction (vane and ultrasonic), Radiometer/Sea Surface Temperature, Pyranometer/Solar Radiation, Photosynthetically Active Radiation (PAR), Air Temperature, Air Pressure, Rain, Ozone and Trace Gases (port and starboard instruments). During the voyage, near real-time data are available from the MNF tool NRUD (Near Real-Time Underway Data) via the link "Visualisation tool for Underway Data" below. To request access after the voyage please contact the data custodian. The Underway data collected during research voyages (identified by the survey name suffix "_vNN") are processed and quality-controlled by the Marine National Facility (MNF). The processed datasets from these voyages are made available at time intervals of 5 sec (NetCDF format), 5 sec, 10 sec, 1 min and 5 min (ASCII/CSV format) through a voyage-specific metadata record. Additional information regarding processed datasets is available in the Voyage Summary and/or the Data Processing Reports linked to the relevant metadata records.

The Radon measurements are obtained from a sensor mounted on the Research Vessel RV Investigator of the Australian Marine National Facility (MNF) managed by CSIRO Oceans and Atmosphere (O&A), and processed by ANSTO's Institute for Environmental Research. The dataset includes quality-controlled data collected from 2014 onwards. The RV Investigator voyages where data was collected and processed are listed below in this record. Potential users of the dataset are encouraged to discuss any aspects of its application with the contact persons listed in the dataset “Notes” tab: we are very enthusiastic and keen to support and participate in your science! REFERENCES: Zahorowski, W. and Whittlestone, S. (1999). Radon database 1987-1996: A review. In: Baseline Atmospheric Program (Australia) 1996 (eds. Gras, JL, Derek N, Tindale, NW, and Dick, AL). Bureau of Meteorology and CSIRO Atmospheric Research, Melbourne, 71-80. Zahorowski, W. et al. (2013). Constraining annual and seasonal radon-222 flux density from the Southern Ocean using radon-222 concentrations in the boundary layer at Cape Grim. Tellus B, 65. ISSN 1600-0889. doi:http://dx.doi.org/10.3402/tellusb.v65i0.19622. Chambers, SD, Hong, SB, Williams, AG, Crawford, J, Griffiths, AD, & Park, SJ (2014). Characterising terrestrial influences on Antarctic air masses using Radon-222 measurements at King George Island. Atmospheric Chemistry and Physics, 14(18), 9903-9916. doi:http://dx.doi.org/10.5194/acp-14-9903-2014. Chambers, S, Williams, AG, Zahorowski, W, Griffiths, A and Crawford, J. (2011). Separating remote fetch and local mixing influences on vertical radon measurements in the lower atmosphere. Tellus B, 63: 843-859. doi:10.1111/j.1600-0889.2011.00565.x. Griffiths AD, Chambers SD, Williams AG and Werczynski SR. (2016). Increasing the accuracy and temporal resolution of two-filter radon-222 measurements by correcting for the instrument response. Atmos. Meas. Tech., 9:2689-2707. doi:10.5194/amt-9-2689-2016.