Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr
A size-structured ecosystem model was developed and fitted to an extensive set of observations of size-fractionated biomass, primary and heterotrophic bacterial production, respiration, particle flux, and zooplankton herbivory obtained on a cruise in the NE Atlantic during 20 days of the spring bloo...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.419.3248 2023-05-15T17:41:36+02:00 Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr Michael J. R. Fasham Philip W. Boyd The Pennsylvania State University CiteSeerX Archives 1999 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.3248 http://www.aslo.org/lo/toc/vol_44/issue_1/0080.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.3248 http://www.aslo.org/lo/toc/vol_44/issue_1/0080.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_44/issue_1/0080.pdf text 1999 ftciteseerx 2016-01-08T03:52:09Z A size-structured ecosystem model was developed and fitted to an extensive set of observations of size-fractionated biomass, primary and heterotrophic bacterial production, respiration, particle flux, and zooplankton herbivory obtained on a cruise in the NE Atlantic during 20 days of the spring bloom. Rates of water-column-integrated primary production and heterotrophic bacterial production were used to force the model, and the model parameters were determined by optimizing the model to the remaining observations. A unique model solution was not possible in the absence of dissolved organic carbon (DOC) measurements. By setting a weak constraint on the DOC concentrations (that they should remain broadly constant), a solution was obtained that predicted a small DOC increase during the bloom period; this increase was similar in magnitude to observations in other areas and produced a good fit with the other data. Major conclusions: (1) gross primary production (GPP) was over twice the measured 14C production estimates; (2) phytoplankton exudation was a major source of DOC, and 35 % of the GPP flowed through the DOC and was utilized by the bacteria, with a low gross growth efficiency (17%); (3) 62 % of the community respiration came from organisms �5 �m in size; (4) the major source of food for microzooplankton was phytoplankton 1–5 �m in size, but the mesozooplankton ingested more microzooplankton than phytoplankton; and (5) only 8 % of the total net primary production was grazed by mesozooplankton. These results provide quantitative Text Northeast Atlantic Unknown |
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English |
description |
A size-structured ecosystem model was developed and fitted to an extensive set of observations of size-fractionated biomass, primary and heterotrophic bacterial production, respiration, particle flux, and zooplankton herbivory obtained on a cruise in the NE Atlantic during 20 days of the spring bloom. Rates of water-column-integrated primary production and heterotrophic bacterial production were used to force the model, and the model parameters were determined by optimizing the model to the remaining observations. A unique model solution was not possible in the absence of dissolved organic carbon (DOC) measurements. By setting a weak constraint on the DOC concentrations (that they should remain broadly constant), a solution was obtained that predicted a small DOC increase during the bloom period; this increase was similar in magnitude to observations in other areas and produced a good fit with the other data. Major conclusions: (1) gross primary production (GPP) was over twice the measured 14C production estimates; (2) phytoplankton exudation was a major source of DOC, and 35 % of the GPP flowed through the DOC and was utilized by the bacteria, with a low gross growth efficiency (17%); (3) 62 % of the community respiration came from organisms �5 �m in size; (4) the major source of food for microzooplankton was phytoplankton 1–5 �m in size, but the mesozooplankton ingested more microzooplankton than phytoplankton; and (5) only 8 % of the total net primary production was grazed by mesozooplankton. These results provide quantitative |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael J. R. Fasham Philip W. Boyd |
spellingShingle |
Michael J. R. Fasham Philip W. Boyd Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr |
author_facet |
Michael J. R. Fasham Philip W. Boyd |
author_sort |
Michael J. R. Fasham |
title |
Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr |
title_short |
Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr |
title_full |
Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr |
title_fullStr |
Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr |
title_full_unstemmed |
Modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a Lagrangian JGOFS station in the Northeast Atlantic: the importance of DOC. Limnol. Oceanogr |
title_sort |
modeling the relative contributions of autotrophs and heterotrophs to carbon flow at a lagrangian jgofs station in the northeast atlantic: the importance of doc. limnol. oceanogr |
publishDate |
1999 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.3248 http://www.aslo.org/lo/toc/vol_44/issue_1/0080.pdf |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
http://www.aslo.org/lo/toc/vol_44/issue_1/0080.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.3248 http://www.aslo.org/lo/toc/vol_44/issue_1/0080.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766143251567345664 |