Science Keywords>BIOLOGICAL CLASSIFICATION
Southern Ocean Continuous Zooplankton RecordsEntry ID: AADC-00099
Abstract: This dataset contains results from Continuous Plankton Recorder (CPR) surveys in the Southern Ocean. When the opportunity arises, zooplankton species, numbers and abundance data are recorded on a continuous basis as vessels steam through the area between Australia and Antarctica, including Heard and Macquarie Islands. Observations have been made since June 1990 and are ongoing. Obviously the ... observations are not continuous over the region with time.
Many of the original CPR logbooks from the various voyages have also been scanned, and are available via the Australian Antarctic Data Centre's Reports Register.
The fields in this dataset are:
Distance (nautical miles)
A detailed description of the fields in the dataset is as follows:
Two letter code which defines the ship used.
AA - Aurora Australis
HM - Hakuho Maru
KM - Kaiyo Maru
SH - Shirase
TA - Tangaroa
UM - Umitaka Maru (no data yet)
Time of segment sample in GMT (UTC).
Date of segment sample in GMT (UTC).
A useful field to allow searches by month and for comparison between months, and also the same month between years.
Another useful field to search for individual years for comparison between years.
Similar to the Year field, but allows search for data from a particular Antarctic season, based around the austral summer, i.e. the 2002/03 season.
Individual segment number for each tow, and renumbered for each tow. This field is probably only of value in checking data in the database against the original laboratory counts.
This is the true segment length as used in the Geocoding program used to cut the silk, and to calculate positions and average environmental data for each segment. In theory, all segments are 5 nautical miles long. However, this wasn't always the case with early Aurora Australis tows, where it was assumed that each marked segment was 5 nautical miles whereas each tow had subtle variations in silk advancement, depending on the wear of the cassette or travel with or against a current. True segment length has since been recalculated. At other times, some silks have been incorrectly cut and the true length has again been recalculated. The last segment of each tow may be less than 5 nautical miles. This field can be used to standardise species counts to say 5 nautical miles or to a theoretical volume filtered by multiplying the distance travelled by aperture area (12.5 x 12.5 mm).
Volume Filtered = Distance (n miles) x 1852 metres x 0.0125 m2.
A 5 nautical mile segment theoretical represents 1.45 m3.
Zooplankton have been identified to lowest possible taxon, usually species, and counted for each segment. For copepods, copepodites and for some species nauplii (e.g. Rhincalanus gigas) have been counted separately, and for euphausiids, naupliar, calyptopis and furcilia developmental stages are identified. "Total Abundance" of all zooplankton in a segment has been included as a data field.
The last four fields are the averaged environmental data for each segment. Three fields, fluorometry (Flu_Value), salinity (TSG_Sal) and sea water temperature (W_Temp_Hi) are common to all research vessels used to date. Note: there doesn't seem to be any fluorometry data for Hakuho Maru. The fourth field is light as PAR (LICOR), which was recorded on all vessels except Shirase, but has been included as a useful parameter to help select data from night and day. Caution: Fluorometry is measured differently on each vessel and are thus not directly comparable between vessels. On Aurora Australis the fluorometry value is arbitrary, although the fluorometer is routinely calibrated. On Tangaroa and Kaiyo Maru, fluorometry has been expressed as a concentration of chlorophyll a. Salinity on AA has been calculated by thermosalinograph. Temperature on AA is measured by a high resolution thyristor near the entrance of a dedicated seawater line, to avoid the problems of heating of the water in by the ship as it passes through pipes. Again the data may not be fully comparable with other vessels. Light as PAR is recorded as micro-Einsteins m-1 s-1.
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