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Modeling the CO2 dynamics in the Laptev Sea, Arctic Ocean: Part II. Sensitivity of fluxes to changes in the forcing

Artikel i vetenskaplig tidskrift
Författare Irene Wåhlström
Anders Omstedt
Göran Björk
Leif G Anderson
Publicerad i Journal of Marine Systems
Volym 111-112
Sidor 1-10
ISSN 0924-7963
Publiceringsår 2013
Publicerad vid Institutionen för geovetenskaper
Institutionen för kemi och molekylärbiologi
Sidor 1-10
Språk en
Länkar dx.doi.org/10.1016/j.jmarsys.2012.0...
Ämnesord Carbon dioxide, Arctic Ocean, Laptev Sea, Biogeochemistry
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Substantial increase in atmospheric temperature has been observed over the Siberian Arctic during the last decades, likely a manifestation of climate change as a result of amplified concentration of greenhouse gases in the atmosphere. This has raised questions about possible feedbacks to the atmospheric carbon dioxide concentration by processes acting in the ocean and the river drainage basins. Addressing these questions, simulations with different forcings have been performed utilizing a one-dimensional, time dependent coupled physical- biogeochemical model that has been optimized for the carbon system in the Laptev Sea of the Arctic Ocean. The forcings applied are: increased air temperature, wind or river discharge; increased concentration of dissolved organic carbon or nutrients in river runoff; increased partial pressure of carbon dioxide in the atmosphere or the runoff as well as a combination of five of these forcings. The model simulations reveal a net outgasing of CO2 from the ocean to the atmosphere when the dissolved organic carbon and the partial pressure of carbon dioxide in river runoff are doubled. However, an increase in the oceans ability to take up carbon dioxide occurs if concentration of nutrients in runoff increases, which is a result of increased primary productivity. The ocean also acts as a stronger sink for atmospheric carbon dioxide when increasing the air temperature, wind speed or the atmospheric partial pressure of carbon dioxide. To reflect the conditions at the end of this century a simulation with changes of several forcings parameters were performed, i.e. with doubled atmospheric partial pressure of carbon dioxide, 4oC temperature increase in the air, doubling the runoff dissolved organic carbon concentration, increasing the river discharge by 25 % and increasing the wind speed by 10 %. This simulation increased the uptake of the ocean by more than five times, from -0.9 ( 0.3) to -4.6 (1.3) molC m-2 y-1.

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