The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX)
To better understand the role of iron in driving marine ecosystems, the Southern Ocean Iron Experiment (SOFeX) fertilized two surface water patches with iron north and south of the Antarctic Polar Front Zone (APFZ). Using 1-D coupled biological-physical simulations, we examine the biogeochemical dyn...
Published in: | Journal of Marine Systems |
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2008
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Online Access: | https://escholarship.org/uc/item/9zb0c589 https://escholarship.org/content/qt9zb0c589/qt9zb0c589.pdf https://doi.org/10.1016/j.jmarsys.2007.07.002 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt9zb0c589 2024-09-15T17:46:53+00:00 The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) Krishnamurthy, Aparna Moore, J Keith Doney, Scott C 112 - 130 2008-05-01 application/pdf https://escholarship.org/uc/item/9zb0c589 https://escholarship.org/content/qt9zb0c589/qt9zb0c589.pdf https://doi.org/10.1016/j.jmarsys.2007.07.002 unknown eScholarship, University of California qt9zb0c589 https://escholarship.org/uc/item/9zb0c589 https://escholarship.org/content/qt9zb0c589/qt9zb0c589.pdf doi:10.1016/j.jmarsys.2007.07.002 CC-BY Journal of Marine Systems, vol 71, iss 1-2 Life Below Water SOFeX southern ocean HNLC marine ecosystem model nutrient limitation light limitation mixed layer depth Phytoplankton community iron fertilization Oceanography article 2008 ftcdlib https://doi.org/10.1016/j.jmarsys.2007.07.002 2024-06-28T06:28:20Z To better understand the role of iron in driving marine ecosystems, the Southern Ocean Iron Experiment (SOFeX) fertilized two surface water patches with iron north and south of the Antarctic Polar Front Zone (APFZ). Using 1-D coupled biological-physical simulations, we examine the biogeochemical dynamics that occurred both inside and outside of the fertilized patches during and shortly after the SOFeX field campaign. We focus, in particular, on three main issues governing the biological response to deliberate iron fertilization: the interaction among phytoplankton, light, macronutrient and iron limitation; dilution and lateral mixing between the fertilized patch and external, unfertilized waters; and the effect of varying mixed layer depth on the light field. At the patch south of the APFZ, sensitivity simulations with no dilution results in the maximum bloom magnitude, whereas dilution with external water extends the development of the north patch bloom by relieving silicon limitation. In model sensitivity studies for both sites, maximum chlorophyll concentration and dissolved inorganic carbon depletion inside the fertilized patches are inversely related to mixed layer depth, similar to the patterns observed across a number of iron fertilization field experiments. Our results suggest that Southern Ocean phytoplankton blooms resulting from natural or deliberate iron fertilization will tend to become iron-light co-limited unless the mixed layer depth is quite shallow. © 2007 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of California: eScholarship Journal of Marine Systems 71 1-2 112 130 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Life Below Water SOFeX southern ocean HNLC marine ecosystem model nutrient limitation light limitation mixed layer depth Phytoplankton community iron fertilization Oceanography |
spellingShingle |
Life Below Water SOFeX southern ocean HNLC marine ecosystem model nutrient limitation light limitation mixed layer depth Phytoplankton community iron fertilization Oceanography Krishnamurthy, Aparna Moore, J Keith Doney, Scott C The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) |
topic_facet |
Life Below Water SOFeX southern ocean HNLC marine ecosystem model nutrient limitation light limitation mixed layer depth Phytoplankton community iron fertilization Oceanography |
description |
To better understand the role of iron in driving marine ecosystems, the Southern Ocean Iron Experiment (SOFeX) fertilized two surface water patches with iron north and south of the Antarctic Polar Front Zone (APFZ). Using 1-D coupled biological-physical simulations, we examine the biogeochemical dynamics that occurred both inside and outside of the fertilized patches during and shortly after the SOFeX field campaign. We focus, in particular, on three main issues governing the biological response to deliberate iron fertilization: the interaction among phytoplankton, light, macronutrient and iron limitation; dilution and lateral mixing between the fertilized patch and external, unfertilized waters; and the effect of varying mixed layer depth on the light field. At the patch south of the APFZ, sensitivity simulations with no dilution results in the maximum bloom magnitude, whereas dilution with external water extends the development of the north patch bloom by relieving silicon limitation. In model sensitivity studies for both sites, maximum chlorophyll concentration and dissolved inorganic carbon depletion inside the fertilized patches are inversely related to mixed layer depth, similar to the patterns observed across a number of iron fertilization field experiments. Our results suggest that Southern Ocean phytoplankton blooms resulting from natural or deliberate iron fertilization will tend to become iron-light co-limited unless the mixed layer depth is quite shallow. © 2007 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Krishnamurthy, Aparna Moore, J Keith Doney, Scott C |
author_facet |
Krishnamurthy, Aparna Moore, J Keith Doney, Scott C |
author_sort |
Krishnamurthy, Aparna |
title |
The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) |
title_short |
The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) |
title_full |
The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) |
title_fullStr |
The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) |
title_full_unstemmed |
The effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-D simulations of the southern ocean iron experiment (SOFeX) |
title_sort |
effects of dilution and mixed layer depth on deliberate ocean iron fertilization: 1-d simulations of the southern ocean iron experiment (sofex) |
publisher |
eScholarship, University of California |
publishDate |
2008 |
url |
https://escholarship.org/uc/item/9zb0c589 https://escholarship.org/content/qt9zb0c589/qt9zb0c589.pdf https://doi.org/10.1016/j.jmarsys.2007.07.002 |
op_coverage |
112 - 130 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Journal of Marine Systems, vol 71, iss 1-2 |
op_relation |
qt9zb0c589 https://escholarship.org/uc/item/9zb0c589 https://escholarship.org/content/qt9zb0c589/qt9zb0c589.pdf doi:10.1016/j.jmarsys.2007.07.002 |
op_rights |
CC-BY |
op_doi |
https://doi.org/10.1016/j.jmarsys.2007.07.002 |
container_title |
Journal of Marine Systems |
container_volume |
71 |
container_issue |
1-2 |
container_start_page |
112 |
op_container_end_page |
130 |
_version_ |
1810495317949284352 |