Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic
Recent field observations suggest that the radiative forcing of aerosol and clouds in the Arctic may be seasonally regulated by the oceanic emissions of the climatically-important biogenic trace gas dimethylsulfide (DMS). However, the validity of the proposed argument is challenged by the limited sp...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/10486 2023-05-15T14:41:21+02:00 Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic Hayashida, Hakase Steiner, Nadja S. Monahan, Adam Hugh 2018 application/pdf https://dspace.library.uvic.ca//handle/1828/10486 English en eng https://dspace.library.uvic.ca//handle/1828/10486 Available to the World Wide Web oceanography sea ice arctic biogeochemistry dimethylsulfide numerical modelling DMS ecosystem Thesis 2018 ftuvicpubl 2022-05-19T06:14:41Z Recent field observations suggest that the radiative forcing of aerosol and clouds in the Arctic may be seasonally regulated by the oceanic emissions of the climatically-important biogenic trace gas dimethylsulfide (DMS). However, the validity of the proposed argument is challenged by the limited spatio-temporal coverage of these earlier studies in this difficult-to-access region. In particular, little is known about the pan-Arctic distribution of the oceanic DMS emissions, its temporal variability, and the impacts of sea-ice biogeochemistry on these emissions. In this dissertation, I investigated these unexplored subjects through numerical modelling. Using a one-dimensional (1-D) column modelling framework, I developed a coupled sea ice-ocean biogeochemical model and assessed the impacts of bottom-ice algae ecosystems on the underlying pelagic ecosystems and the associated production and emissions of DMS. The model was calibrated by time-series measurements of snow and melt-pond depth, ice thickness, bottom-ice and under-ice concentrations of chlorophyll-a and dimethylsulfoniopropionate (DMSP), and under-ice irradiance obtained on the first-year landfast sea ice in Resolute Passage during May-June of 2010. Many of the model parameters for the DMSP and DMS production and removal processes were derived from recent field measurements in the Arctic, which is advantageous over the previous Arctic-focused DMS model studies as their model parameters were based on the measurements in extra-polar regions. The impacts of sea-ice biogeochemistry on the DMS production in the underlying water column and its potential emissions into the overlying atmosphere were quantified through sensitivity experiments. To extend the study domain to the pan-Arctic, I implemented the sea-ice ecosystem and the coupled sea ice-pelagic DMS cycling components of the 1-D column model into a three-dimensional (3-D) regional modelling framework. A multi-decadal model simulation was performed over the period 1969-2015 using realistic atmospheric ... Thesis Arctic ice algae Sea ice University of Victoria (Canada): UVicDSpace Arctic Resolute Passage ENVELOPE(-95.585,-95.585,74.702,74.702) |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
oceanography sea ice arctic biogeochemistry dimethylsulfide numerical modelling DMS ecosystem |
spellingShingle |
oceanography sea ice arctic biogeochemistry dimethylsulfide numerical modelling DMS ecosystem Hayashida, Hakase Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic |
topic_facet |
oceanography sea ice arctic biogeochemistry dimethylsulfide numerical modelling DMS ecosystem |
description |
Recent field observations suggest that the radiative forcing of aerosol and clouds in the Arctic may be seasonally regulated by the oceanic emissions of the climatically-important biogenic trace gas dimethylsulfide (DMS). However, the validity of the proposed argument is challenged by the limited spatio-temporal coverage of these earlier studies in this difficult-to-access region. In particular, little is known about the pan-Arctic distribution of the oceanic DMS emissions, its temporal variability, and the impacts of sea-ice biogeochemistry on these emissions. In this dissertation, I investigated these unexplored subjects through numerical modelling. Using a one-dimensional (1-D) column modelling framework, I developed a coupled sea ice-ocean biogeochemical model and assessed the impacts of bottom-ice algae ecosystems on the underlying pelagic ecosystems and the associated production and emissions of DMS. The model was calibrated by time-series measurements of snow and melt-pond depth, ice thickness, bottom-ice and under-ice concentrations of chlorophyll-a and dimethylsulfoniopropionate (DMSP), and under-ice irradiance obtained on the first-year landfast sea ice in Resolute Passage during May-June of 2010. Many of the model parameters for the DMSP and DMS production and removal processes were derived from recent field measurements in the Arctic, which is advantageous over the previous Arctic-focused DMS model studies as their model parameters were based on the measurements in extra-polar regions. The impacts of sea-ice biogeochemistry on the DMS production in the underlying water column and its potential emissions into the overlying atmosphere were quantified through sensitivity experiments. To extend the study domain to the pan-Arctic, I implemented the sea-ice ecosystem and the coupled sea ice-pelagic DMS cycling components of the 1-D column model into a three-dimensional (3-D) regional modelling framework. A multi-decadal model simulation was performed over the period 1969-2015 using realistic atmospheric ... |
author2 |
Steiner, Nadja S. Monahan, Adam Hugh |
format |
Thesis |
author |
Hayashida, Hakase |
author_facet |
Hayashida, Hakase |
author_sort |
Hayashida, Hakase |
title |
Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic |
title_short |
Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic |
title_full |
Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic |
title_fullStr |
Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic |
title_full_unstemmed |
Modelling sea-ice and oceanic dimethylsulfide production and emissions in the Arctic |
title_sort |
modelling sea-ice and oceanic dimethylsulfide production and emissions in the arctic |
publishDate |
2018 |
url |
https://dspace.library.uvic.ca//handle/1828/10486 |
long_lat |
ENVELOPE(-95.585,-95.585,74.702,74.702) |
geographic |
Arctic Resolute Passage |
geographic_facet |
Arctic Resolute Passage |
genre |
Arctic ice algae Sea ice |
genre_facet |
Arctic ice algae Sea ice |
op_relation |
https://dspace.library.uvic.ca//handle/1828/10486 |
op_rights |
Available to the World Wide Web |
_version_ |
1766313142015492096 |