The carbon cycle in the Australian sector of the Southern Ocean.Entry ID: ASAC_1302
Abstract: ---- Public Summary from Project ----
The Southern Ocean is one the most significant regions on earth for regulating the build up of anthropogenic CO2 in the atmosphere, and the capacity for carbon uptake in the region could be altered by climate change. The project aims to establish a time series of anthropogenic carbon accumulation. The work will be used to identify processes regulating the CO2 ... uptake and to test models that predict future uptake.
Data collection for this project was solely carried out on voyage three of the 2001/2002 season.
Total dissolved inorganic carbon (TCO2) and titration alkalinity (TA) measurements were made on the CLIVAR SR3 section between Hobart and Antarctica. The carbon samples were taken from a 24 bottle rosette and have an approximate horizontal resolution of 60nm with closer spacing in regions where horizontal gradients were large. Many of the stations sampled for carbon had multiple casts to improve vertical resolution.
The CRM analyses were used to calibrate the titration cell volume. Preliminary analysis of Certified Reference Material (CRM) Seawater from Scripps Institution of Oceanography show data quality was generally good. For TCO2 the measurements on Batch 52 CRM's the average concentration was 2005.65 +/- 1.36 micromol/kg (n=65; 1 s.d.). For TA the average CRM values were 2224.76 +/- 1.17 micromol/kg (n=45, 1 s.d.). The certified values for Batch 52 was 2005.57 +/- 0.39 and 2224.72 +/- 0.81 micromol/kg for TCO2 and TA, respectively.
The fields in this dataset follow standard WOCE naming practices. See the url given below for further details.
The fields in this dataset are:
The Southern Ocean is a critical region on earth for taking up anthropogenic carbon dioxide (CO2) from the atmosphere. Over the past year, underway equipment has been used on a number of Aurora Australis voyages to estimate the air-sea exchange of CO2 and to characterise the variability in the exchange. The information is part of a large long term international effort to determine how much CO2 is being taken up by the ocean and to improve predictions of how the uptake and CO2 storage will change in future.
An underway CO2 system was run on a number of voyages on Aurora Australis.
(Click for Interactive Map)
Start Date: 2001-11-20Stop Date: 2001-12-11
Start Date: 2008-09-30Stop Date: 2010-03-31
Quality Data are quality controlled following WOCE guidelines. Flags are included with these data (good=2, bad =4, suspicious =3) and are preliminary.
Plans to install an aerosol sampler have been delayed because the equipment needed to be redesigned to handle Southern Ocean conditions, and there are difficulties getting people to operate the equipment on voyages. It ... is not certain this part of the project will be possible in 2009/2010.
Underway CO2 measurements were made during transits on Aurora Australis voyages, V1, V2(return), V3, and V5.
Difficulties affecting project:
The aerosol sampler needed to be redesigned to handle the conditions. Particulate contamination from stack gas is also a concern for the aerosol sampling.
Flooding of the oceanographic lab due to poor drainage is an ongoing problem and is causing loss of data. A problem with the ship's thermosalinograph when operated in the ice was identified a couple of years ago and is still not corrected, degrading the data quality. Cavitation in the seawater pump is also a problem that will degrade data quality for oxygen and perhaps CO2. While the problem persists it is unlikely oxygen measurements will be of much value on the ship.
The underway equipment is usually run by volunteers. The work is not arduous and requires about 20 minutes per day when the ship is underway. The Deputy Voyage Leaders often volunteer, but they are not always available. Organising volunteers and difficulty finding them has resulted in us needing to leave the systems off at times.
Access Constraints The dataset is not yet publicly available. It has also been submitted to the Carbon Dioxide Information Analysis Center where it is undergoing further quality checks.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at the URL below when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 101 kb
Distribution Format: csv
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 5273
Fax: +61 3 6232 5000
Email: Bronte.Tilbrook at csiro.au
CSIRO Marine and Atmospheric Research GPO BOX 1538
Province or State: Tasmania
Postal Code: 7001
Creation and Review Dates
DIF Creation Date: 2001-04-09
Last DIF Revision Date: 2009-04-20