Markager, S. National Environmental Research Institute, markager@dmu.dk

 
DOC AS REGULATING FACTOR FOR AREA PRIMARY PRODUCTION IN COASTAL AREAS
 
Danish coastal areas encompass a gradient of DOC from 1 to 6 mg C /liter from the North Sea to the Baltic Sea and the inner parts of fjords. On several stations along this gradient a photon budget was constructed and the impact of DOC for area primary production was estimated. The fraction of surface light (PAR) absorbed by DOC increased from 17% to c. 40%. This caused the fraction of light captured by phytoplankton to decrease by a factor of two at a constant chlorophyll concentration. Model calculations show that the variation in DOC concentration observed in Danish coastal areas can change area primary production by 50% at a constant chlorophyll concentration of 1 microgram/liter. Thus, DOC is an important factor for the regulation of primary production. Variation in DOC concentrations spatially and over a historical time scale should be considered in models for primary productions in marine areas.
 
Day: Thursday, Feb. 4
Time: 09:00 - 09:15am
Location: Sweeney Center
 
Code: SS39TH0900S