This data set contains depth sounding data (water depths) for Ellis Fjord, one of the fjords of the Vestfold Hills. The data were collected between 1994 and 1999. See the links in the related links section for copies of maps (PDF and TIFF) of Ellis Fjord soundings, sounding transects and bathymetric contours. Map 15623: Ellis Fjord, Vestfold Hills - Depth Soundings Map 15624: Ellis Fjord, Vestfold Hills - Sounding transects Map 15625: Ellis Fjord, Vestfold Hills - Sounding transects overlaying topography Map 15626: Ellis Fjord, Vestfold Hills - Transect coordinates and ground control Map 15627: Ellis Fjord, Vestfold Hills - Bathymetric Contours

Depth related changes in sediment characteristics and the composition of infaunal invertebrate communities were investigated at two sites in the Windmill Islands around Casey station, East Antarctica, during the 2006/07 summer. Sediment characteristics were investigated via sediment cores (5cm deep x 5cm diameter) collected from 4 depths (7m, 11m, 17, and 22m) from each of three transects at two sites (McGrady Cove and O'Brien Bay 1). Measured sediment characteristics included grain size distribution, total organic carbon and the concentration of a range of heavy metals. This work was conducted as part of ASAC 2201 (ASAC_2201).

This metadata record is a modified child record of an original parent record originating from custodians of data associated with Geoscience Australia (The identifier of the parent record is ANZCW0703006701, and can be found on the Australian Spatial Data Directory website - see the URL given below). A bathymetric grid of the Macquarie Island Region (Longitudes 151 E and 167 E, Latitudes 48 S and 62 S) was produced. In doing so, the individual datasets used were closely examined and any deficiencies noted for further follow up or were rectified immediately and the changes documented. These datasets include modern multibeam data, coastline data obtained from georeferenced SPOT imagery, hydrographic quality data, echosounder data from research and fishing vessels and satellite derived bathymetric data. A hierarchical system was employed whereby the best and most extensive datasets were gridded first and applied as a mask to the next best dataset. A new masking grid would be formed from these datasets to pass non-overlapping data in the next best dataset. This procedure was employed until finally the satellite data were masked. All the various levels of masked data were then brought together by the gridding algorithm (Intrepid and Desmond Fitzgerald Associates) and an ERMapper format grid produced. A grid cell size of 0.00225 (nominal 250m) was used with many iterations of minimum curvature gridding and several passes of smoothing. The final grid is available in geotiff, ArcInfo ascii and xyz text formats. A detailed report of the work completed is also available.

Depth related changes in the composition of infaunal invertebrate communities were investigated at two sites in the Windmill Islands around Casey station, East Antarctica, during the 2006/07 summer. Sediment cores (10cm deep x 10cm diameter) were collected from 4 depths (7m, 11m, 17, and 22m) from each of three transects at two sites (McGrady Cove and O'Brien Bay 1). Cores were sieved through a 500 micron mesh and extracted fauna were preserved in 8% formalin and were later counted and identified to species or to morphospecies established through previous infaunal research at Casey. This work was conducted as part of ASAC 2201 (ASAC_2201).

3 litres of seawater were collected every 2nd CTD (conductivity, temperature and depth) cast on every CTD transect of the BROKE-West voyage. 7 CTD transects were completed on the BROKE-West voyage, all on southwards legs. Samples were collected at 6 depths in the top 200 m of the water column using niskin bottles. 2 litres were filtered through polycarbonate filters and 1 litre was filtered through a fibreglass filter. Chemical digestion of the polycarbonate filter enabled us to determine the particulate silicon concentration for each sample (using the nutrient autoanalyser onboard the Aurora Australis, see hydrochemistry section), fibreglass filters have been dried and stored for CHN analysis back on shore. This work was completed as part of ASAC projects 2655 and 2679 (ASAC_2655, ASAC_2679).

These data contain results from grazing dilution experiments conducted during BROKE-West. Experiments were conducted at 22 locations on the BROKE-West transect. Data are presented in an excel spreadsheet containing sample collection information (longitude, latitude, UTC date and time, depth), experiment details (incubation time, dilution series), experiment results (chlorophyll a, bacterial concentrations, heterotrophic flagellate concentrations, phytoplankton concentrations, microzooplankton concentrations, geometric mean predator density, phytoplankton growth rates, microzooplankton grazing rates for bacteria and phytoplankton, bacterial growth rates). This work was completed as part of ASAC projects 2655 and 2679 (ASAC_2655, ASAC_2679).