INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1
Measurements of salinity, temperature, phytoplankton biomass and speciation, dissolved nitrate, dimethylsulphide (DMS) in seawater and air, and dimethylsulphoniopropionate (DMSP), were made in the subantarctic zone of the Southern Ocean from 40|-54|S, and 140|-153|E during the Southern Hemisphere Ma...
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ftepa:oai:epaEIMS:107133 2023-05-15T18:25:09+02:00 INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 G Jones MAJ Curran H Swan R Greene F Griffiths L Clementson 2006-08-16T18:48:15Z http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=107133 unknown NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY Text 2006 ftepa 2007-11-21T14:47:31Z Measurements of salinity, temperature, phytoplankton biomass and speciation, dissolved nitrate, dimethylsulphide (DMS) in seawater and air, and dimethylsulphoniopropionate (DMSP), were made in the subantarctic zone of the Southern Ocean from 40|-54|S, and 140|-153|E during the Southern Hemisphere Marine Aerosol Characterisation Experiment (ACE-1). DMSP concentrations were highest in subtropical convergence zone (STCZ) waters, intermediate in subantarctic waters, and lowest in polar waters. DMSP appeared to decrease at frontal regions between these major water masses. In subantarctic waters high levels of DMSP were generally associated with an increase in dinoflagellate biomass and low microzooplankton grazing rates. Lower DMSP concentrations occurred in polar waters when the diatom biomass and grazing rates were high. DMS levels measured on Southern Surveyor ranged from not detectable (nd) to 5.6 nM (mean 1.7 nM), with below average levels in subantarctic waters (mean 1.25 nM), and above average levels (mean=1.93 nM) in polar waters. Pulses of DMS occurred as Southern Surveyor travelled south into polar waters, with a large pulse (mean=2.3 nM) highlighted as the vessel travelled back into subantarctic waters (46-47|S, 148-151|E) in early December. By using the dissolved DMSP (DMSPd) to DMS ratio as an index of the bacterial conversion of DMSPd to DMS some evidence was found that, in polar waters, increased microzooplankton (MZP) grazing in diatom dominated waters, may lead to above average concentrations of DMS. This does not appear to be the case when the biomass was dominated by dinoflagellates in subantarctic waters. Text Southern Ocean Environmental Protection Agency (EPA): Science Inventory Southern Ocean |
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Open Polar |
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Environmental Protection Agency (EPA): Science Inventory |
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ftepa |
language |
unknown |
description |
Measurements of salinity, temperature, phytoplankton biomass and speciation, dissolved nitrate, dimethylsulphide (DMS) in seawater and air, and dimethylsulphoniopropionate (DMSP), were made in the subantarctic zone of the Southern Ocean from 40|-54|S, and 140|-153|E during the Southern Hemisphere Marine Aerosol Characterisation Experiment (ACE-1). DMSP concentrations were highest in subtropical convergence zone (STCZ) waters, intermediate in subantarctic waters, and lowest in polar waters. DMSP appeared to decrease at frontal regions between these major water masses. In subantarctic waters high levels of DMSP were generally associated with an increase in dinoflagellate biomass and low microzooplankton grazing rates. Lower DMSP concentrations occurred in polar waters when the diatom biomass and grazing rates were high. DMS levels measured on Southern Surveyor ranged from not detectable (nd) to 5.6 nM (mean 1.7 nM), with below average levels in subantarctic waters (mean 1.25 nM), and above average levels (mean=1.93 nM) in polar waters. Pulses of DMS occurred as Southern Surveyor travelled south into polar waters, with a large pulse (mean=2.3 nM) highlighted as the vessel travelled back into subantarctic waters (46-47|S, 148-151|E) in early December. By using the dissolved DMSP (DMSPd) to DMS ratio as an index of the bacterial conversion of DMSPd to DMS some evidence was found that, in polar waters, increased microzooplankton (MZP) grazing in diatom dominated waters, may lead to above average concentrations of DMS. This does not appear to be the case when the biomass was dominated by dinoflagellates in subantarctic waters. |
format |
Text |
author |
G Jones MAJ Curran H Swan R Greene F Griffiths L Clementson |
spellingShingle |
G Jones MAJ Curran H Swan R Greene F Griffiths L Clementson INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 |
author_facet |
G Jones MAJ Curran H Swan R Greene F Griffiths L Clementson |
author_sort |
G Jones |
title |
INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 |
title_short |
INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 |
title_full |
INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 |
title_fullStr |
INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 |
title_full_unstemmed |
INFLUENCE OF DIFFERENT WATER MASSES AND BIOLOGICAL ACTIVITY ON DIMETHYLSULPHIDE AND DIMETHYLSULPHONIOPROPIONATE IN THE SUBANTARCTIC ZONE OF THE SOUTHERN OCEAN DURING ACE-1 |
title_sort |
influence of different water masses and biological activity on dimethylsulphide and dimethylsulphoniopropionate in the subantarctic zone of the southern ocean during ace-1 |
publishDate |
2006 |
url |
http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=107133 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY |
_version_ |
1766206388073136128 |