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| Titel |
A modelling study of carbon dioxide up take in a temporate seasonally stratified shelf sea |
| VerfasserIn |
Holly Pelling, Mattias Green, Tom Rippeth, Hilary Kennedy |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250032036
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| Zusammenfassung |
| Recent observations indicate seasonally stratified temperate and polar shelf seas display a
significant summer dissolved inorganic carbon (DIC) deficit, which maintains a major CO2
sink. Here we couple a simple vertical exchange model with the CO2SYS carbon chemistry
model to investigate the role of the diapycnal nutrient flux in maintaining the summer surface
water DIC deficit. Two mixing mechanisms are parameterised within the model; (i)
barotropic tidal mixing is introduced through two semi-diurnal constituents to simulate the
effect of the spring-neap cycle on the water column stratification and (ii) ‘internal wave’
mixing is implemented directly, by adding energy, within the thermocline. The results
highlight the potential importance of the magnitude and temporal variability of diapycnal
mixing in determining the strength of the CO2 pump, through the introduction of nutrients
from the dark lower layer into the photic zone, thus highlighting the importance of the
correct parameterisation of vertical mixing in shelf sea biogeochemical models. |
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