IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL
Diatoms play an essential role in marine biogeochemical cycles by their large contribution to primary production and particle export. Under nutrient limitation, diatom biomass often exhibits large deviations from the Redfield ratio. Here a biogeochemical ocean general circulation model is applied to...
Main Authors: | , , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
Association for the Sciences of Limnology and Oceanography
2012
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/35068/ https://hdl.handle.net/10013/epic.43150 |
id |
ftawi:oai:epic.awi.de:35068 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:35068 2023-05-15T18:25:29+02:00 IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL Wang, Tingting Völker, Christoph Hauck, Judith Hohn, Sönke Wolf-Gladrow, Dieter 2012-07 https://epic.awi.de/id/eprint/35068/ https://hdl.handle.net/10013/epic.43150 unknown Association for the Sciences of Limnology and Oceanography Wang, T. , Völker, C. orcid:0000-0003-3032-114X , Hauck, J. orcid:0000-0003-4723-9652 , Hohn, S. and Wolf-Gladrow, D. orcid:0000-0001-9531-8668 (2012) IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL , 2012 ASLO Aquatic Sciences Meeting, Japan, 8 July 2012 - 13 July 2012 . hdl:10013/epic.43150 EPIC32012 ASLO Aquatic Sciences Meeting, Japan, 2012-07-08-2012-07-13Shiga, Japan, Association for the Sciences of Limnology and Oceanography Conference notRev 2012 ftawi 2021-12-24T15:39:24Z Diatoms play an essential role in marine biogeochemical cycles by their large contribution to primary production and particle export. Under nutrient limitation, diatom biomass often exhibits large deviations from the Redfield ratio. Here a biogeochemical ocean general circulation model is applied to investigate the influence of variations in diatom stoichiometry. The ecosystem model allows for variable Chl:C:N:Si stoichiometry in phytoplankton biomass regulated by light and availability of macronutrients (nitrate, silicic acid) and iron. Two size classes of phytoplankton are considered with the larger representing diatoms. After 5 years of simulation, the surface distributions of both phytoplankton groups are in a reasonable cyclostationary state. Compared to the ‘steady’ state, a sensitivity simulation with fixed diatom stoichiometry for Si:N of 1.2:1 showed a slight shift from small phytoplankton to diatoms leading to a shift in primary production between two groups. Total primary and export production were conservative, indicating a tendency for compensation. In the Southern Ocean, less opal production and decreased particle export ratio of Si:N resulted in raising silicic acid to the south of Subantarctic Front elucidating the importance of decoupling of different elemental cycles. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Southern Ocean |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Diatoms play an essential role in marine biogeochemical cycles by their large contribution to primary production and particle export. Under nutrient limitation, diatom biomass often exhibits large deviations from the Redfield ratio. Here a biogeochemical ocean general circulation model is applied to investigate the influence of variations in diatom stoichiometry. The ecosystem model allows for variable Chl:C:N:Si stoichiometry in phytoplankton biomass regulated by light and availability of macronutrients (nitrate, silicic acid) and iron. Two size classes of phytoplankton are considered with the larger representing diatoms. After 5 years of simulation, the surface distributions of both phytoplankton groups are in a reasonable cyclostationary state. Compared to the ‘steady’ state, a sensitivity simulation with fixed diatom stoichiometry for Si:N of 1.2:1 showed a slight shift from small phytoplankton to diatoms leading to a shift in primary production between two groups. Total primary and export production were conservative, indicating a tendency for compensation. In the Southern Ocean, less opal production and decreased particle export ratio of Si:N resulted in raising silicic acid to the south of Subantarctic Front elucidating the importance of decoupling of different elemental cycles. |
format |
Conference Object |
author |
Wang, Tingting Völker, Christoph Hauck, Judith Hohn, Sönke Wolf-Gladrow, Dieter |
spellingShingle |
Wang, Tingting Völker, Christoph Hauck, Judith Hohn, Sönke Wolf-Gladrow, Dieter IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL |
author_facet |
Wang, Tingting Völker, Christoph Hauck, Judith Hohn, Sönke Wolf-Gladrow, Dieter |
author_sort |
Wang, Tingting |
title |
IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL |
title_short |
IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL |
title_full |
IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL |
title_fullStr |
IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL |
title_full_unstemmed |
IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL |
title_sort |
impact of diatom si:n stoichiometry on marine production and particle export in a global model |
publisher |
Association for the Sciences of Limnology and Oceanography |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/35068/ https://hdl.handle.net/10013/epic.43150 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC32012 ASLO Aquatic Sciences Meeting, Japan, 2012-07-08-2012-07-13Shiga, Japan, Association for the Sciences of Limnology and Oceanography |
op_relation |
Wang, T. , Völker, C. orcid:0000-0003-3032-114X , Hauck, J. orcid:0000-0003-4723-9652 , Hohn, S. and Wolf-Gladrow, D. orcid:0000-0001-9531-8668 (2012) IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL , 2012 ASLO Aquatic Sciences Meeting, Japan, 8 July 2012 - 13 July 2012 . hdl:10013/epic.43150 |
_version_ |
1766206985689104384 |