Seasonal variation of CO2 saturation in the Gulf of Bothnia: Indications of marine net heterotrophy

Algesten, Grete,1974-Umeå universitet,Institutionen för ekologi, miljö och geovetenskap (author)

Seasonal variation of CO2 saturation in the Gulf of Bothnia : Indications of marine net heterotrophy

Seasonal variation of pCO2 and primary and bacterioplankton production were measured in the Gulf of Bothnia during an annual cycle. Surface water was supersaturated with CO2 on an annual basis, indicating net heterotrophy and a source of CO2 to the atmosphere. However, the Gulf of Bothnia oscillated between being a sink and a source of CO2 over the studied period, largely decided by temporal variation in bacterial respiration (BR) and primary production (PP) in the water column above the pycnocline. The calculated annual respiration-production balance (BR-PP) was very similar to the estimated CO2 emission from the Gulf of Bothnia, which indicates that these processes were major determinants of the exchange of CO2 between water and atmosphere. The southern basin (the Bothnian Sea) had a lower net release of CO2 to the atmosphere than the northern Bothnian Bay (7.1 and 9.7 mmol C m−2 d−1, respectively), due to higher primary production, which to a larger extent balanced respiration in this basin.

Wikner, JohanUmeå universitet,Institutionen för ekologi, miljö och geovetenskap,Umeå marina forskningscentrum (UMF),UMFpub(Swepub:umu)jowi0002 (author)
Sobek, SebastianUppsala universitet,Limnologi(Swepub:uu)sebasobe (author)
Tranvik, Lars J.Uppsala universitet,Limnologi(Swepub:uu)larstran (author)
Jansson, MatsUmeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)maja0002 (author)
Umeå universitetInstitutionen för ekologi, miljö och geovetenskap (creator_code:org_t)

In:Global Biogeochemical CyclesWashington, D.C : American Geophysical Union (AGU)18, s. 4021-40280886-62361944-9224

By the author/editor: Algesten, Grete, ...; Wikner, Johan; Sobek, Sebastian; Tranvik, Lars J.; Jansson, Mats

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Oceanography Hyd ...

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