Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling
Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the SAZ Project, a multidisciplinary, multiship inve...
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Online Access: | https://researchdata.ands.org.au/subantarctic-zone-oceanography-phosphate-modeling/699808 https://data.aad.gov.au/metadata/records/ASAC_2256_Phosphate http://nla.gov.au/nla.party-617536 |
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ftands:oai:ands.org.au::699808 2023-05-15T13:46:57+02:00 Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling TRULL, THOMAS WILLIAM (hasPrincipalInvestigator) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-42.0; southlimit=-55.0; westlimit=141.5; eastLimit=141.5; projection=WGS84 Temporal: From 1998-03-01 to 1998-03-31 https://researchdata.ands.org.au/subantarctic-zone-oceanography-phosphate-modeling/699808 https://data.aad.gov.au/metadata/records/ASAC_2256_Phosphate http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.ands.org.au/subantarctic-zone-oceanography-phosphate-modeling/699808 101e1c7d-9b33-441f-99c8-dbbf87f02992 ASAC_2256_Phosphate https://data.aad.gov.au/metadata/records/ASAC_2256_Phosphate http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY PHOSPHATE SAZ SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:16:44Z Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the SAZ Project, a multidisciplinary, multiship investigation carried out south of Australia in the austral summer of 1997-1998. Taken from the abstracts of the referenced paper: We developed and applied a one-dimensional (z) biophysical model to the Subantarctic Zone (SAZ) and the Polar Frontal Zone (PFZ) to simulate seasonal phosphate export production and resupply. The physical component of our model was capable of reproducing the observed seasonal amplitude of sea surface temperature and mixed layer depth. In the biological component of the model we used incident light, mixed layer depth, phosphate availability, and estimates of phytoplankton biomass from the Sea-viewing Wide Field-of-view Sensor to determine production and tuned the model to reproduce the observed seasonal cycle of phosphate. We carried out a series of sensitivity studies, taking into account uncertainties in both physical fields and biological formulations (including potential influence of iron limitation), which led to several robust conclusions (as represented by the ranges below). The major growing season contributed 66-76% of the annual export production in both regions. The simulated annual export production was significantly higher in the PZF (68-83 mmol P m-2) than in the SAZ (52-61 mmol P m-2) despite the PFZ's having lower seasonal nutrient depletion. The higher export production in the PFZ was due to its greater resupply of phosphate to the upper ocean during the September to March period (27-37 mmol P m-2) relative to that in the SAZ (8-15 mmol P m-2). Hence seasonal nutrient depletion was a better estimate of seasonal export production in the SAZ, as demonstrated by its higher ratio of seasonal depletion/export (64-78%) relative to that in the PFZ (34-47%). In the SAZ, vertical mixing was the dominant mechanism for supplying phosphate to the euphotic zone, whereas in the PFZ, vertical mixing supplied only 37% of the phosphate to the euphotic zone, whereas in the PFZ, vertical mixing supplied only 37% of the phosphate to the euphotic zone and horizontal transport supplied the remaining 63%. Dataset Antarc* Antarctic aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Antarctic Austral Southern Ocean The Antarctic ENVELOPE(141.5,141.5,-42.0,-55.0) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY PHOSPHATE SAZ SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
spellingShingle |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY PHOSPHATE SAZ SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling |
topic_facet |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY PHOSPHATE SAZ SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
description |
Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the SAZ Project, a multidisciplinary, multiship investigation carried out south of Australia in the austral summer of 1997-1998. Taken from the abstracts of the referenced paper: We developed and applied a one-dimensional (z) biophysical model to the Subantarctic Zone (SAZ) and the Polar Frontal Zone (PFZ) to simulate seasonal phosphate export production and resupply. The physical component of our model was capable of reproducing the observed seasonal amplitude of sea surface temperature and mixed layer depth. In the biological component of the model we used incident light, mixed layer depth, phosphate availability, and estimates of phytoplankton biomass from the Sea-viewing Wide Field-of-view Sensor to determine production and tuned the model to reproduce the observed seasonal cycle of phosphate. We carried out a series of sensitivity studies, taking into account uncertainties in both physical fields and biological formulations (including potential influence of iron limitation), which led to several robust conclusions (as represented by the ranges below). The major growing season contributed 66-76% of the annual export production in both regions. The simulated annual export production was significantly higher in the PZF (68-83 mmol P m-2) than in the SAZ (52-61 mmol P m-2) despite the PFZ's having lower seasonal nutrient depletion. The higher export production in the PFZ was due to its greater resupply of phosphate to the upper ocean during the September to March period (27-37 mmol P m-2) relative to that in the SAZ (8-15 mmol P m-2). Hence seasonal nutrient depletion was a better estimate of seasonal export production in the SAZ, as demonstrated by its higher ratio of seasonal depletion/export (64-78%) relative to that in the PFZ (34-47%). In the SAZ, vertical mixing was the dominant mechanism for supplying phosphate to the euphotic zone, whereas in the PFZ, vertical mixing supplied only 37% of the phosphate to the euphotic zone, whereas in the PFZ, vertical mixing supplied only 37% of the phosphate to the euphotic zone and horizontal transport supplied the remaining 63%. |
author2 |
TRULL, THOMAS WILLIAM (hasPrincipalInvestigator) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling |
title_short |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling |
title_full |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling |
title_fullStr |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling |
title_full_unstemmed |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Phosphate Modeling |
title_sort |
subantarctic zone oceanography - saz project 1997-1998 - phosphate modeling |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.ands.org.au/subantarctic-zone-oceanography-phosphate-modeling/699808 https://data.aad.gov.au/metadata/records/ASAC_2256_Phosphate http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-42.0; southlimit=-55.0; westlimit=141.5; eastLimit=141.5; projection=WGS84 Temporal: From 1998-03-01 to 1998-03-31 |
long_lat |
ENVELOPE(141.5,141.5,-42.0,-55.0) |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic aurora australis Southern Ocean |
genre_facet |
Antarc* Antarctic aurora australis Southern Ocean |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.ands.org.au/subantarctic-zone-oceanography-phosphate-modeling/699808 101e1c7d-9b33-441f-99c8-dbbf87f02992 ASAC_2256_Phosphate https://data.aad.gov.au/metadata/records/ASAC_2256_Phosphate http://nla.gov.au/nla.party-617536 |
_version_ |
1766245854761451520 |