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Non-Redfieldian Dynamics Explain Seasonal pCO2 Drawdown in the Gulf of Bothnia

Artikel i vetenskaplig tidskrift
Författare Filippa Fransner
Erik Gustafsson
Letizia Tedesco
Marcello Vichi
Robinson Hordoir
Fabien Roquet
Kristian Spilling
Ivan Kuznetsov
Kari Eilola
Carl Magnus Mörth
Christoph Humborg
Jonas Nycander
Publicerad i Journal of Geophysical Research: Oceans
Volym 123
Sidor 166-188
ISSN 21699275
Publiceringsår 2018
Publicerad vid
Sidor 166-188
Språk en
Ämnesord coastal sea, DOC, modeling, pCO drawdown 2, primary production, stoichiometry
Ämneskategorier Oceanografi, Klimatforskning

Sammanfattning

© 2017. American Geophysical Union. All Rights Reserved. High inputs of nutrients and organic matter make coastal seas places of intense air-sea CO2exchange. Due to their complexity, the role of coastal seas in the global air-sea CO2exchange is, however, still uncertain. Here, we investigate the role of phytoplankton stoichiometric flexibility and extracellular DOC production for the seasonal nutrient and CO2partial pressure (pCO2) dynamics in the Gulf of Bothnia, Northern Baltic Sea. A 3-D ocean biogeochemical-physical model with variable phytoplankton stoichiometry is for the first time implemented in the area and validated against observations. By simulating non-Redfieldian internal phytoplankton stoichiometry, and a relatively large production of extracellular dissolved organic carbon (DOC), the model adequately reproduces observed seasonal cycles in macronutrients and pCO2. The uptake of atmospheric CO2is underestimated by 50% if instead using the Redfield ratio to determine the carbon assimilation, as in other Baltic Sea models currently in use. The model further suggests, based on the observed drawdown of pCO2, that observational estimates of organic carbon production in the Gulf of Bothnia, derived with the14C method, may be heavily underestimated. We conclude that stoichiometric variability and uncoupling of carbon and nutrient assimilation have to be considered in order to better understand the carbon cycle in coastal seas.

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