Optical impact of an Emiliania huxleyi bloom in the frontal region of the Barents Sea

Erlend K. Hovland, Kasper Hancke, Morten O. Alver, Ken Drinkwater, Jo Høkedal, Geir Johnsen, Mark Moline, Egil Sakshaug

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

782 Downloads (Pure)

Abstrakt

The impact on downwelling irradiance of phytoplankton, cromophoric dissolved organic matter (CDOM) and particulate inorganic carbon (PIC) in the form of coccoliths, is described using a radiative transfer model and field data from the Barents Sea (BS). While annual Emiliania huxleyi blooms in the BS have been detected with satellite remote sensing, this is the first bio-optical field study on E. huxleyi from this area. Bio-optical variables were measured in August 2007 along a transect through the Polar Front from Arctic Water (ArW) into an E. huxleyi bloom in Atlantic Water (AW). The depth of the euphotic zone was on average 52m in ArW, 45m in frontal mixed water (FMW) and 21m in AW. At the 10% irradiance depth in AW, phytoplankton had attenuated 40%, CDOM 17% and PIC 18% of the irradiance from 400 to 700nm. Numbers from ArW were 36%, 26% and <1%, respectively. The relative potential for Primary Production (PP pot) in AW was 1.8× higher than in ArW, and PIC had reduced PP pot in AW by 20-40% at stations with ~100-130mg PIC m -3. A novel approach for estimating PIC based on a theoretical relationship between diffuse attenuation and irradiance reflectance is also described.

OriginalsprogEngelsk
TidsskriftJournal of Marine Systems
Vol/bind130
Sider (fra-til)228-240
ISSN0924-7963
DOI
StatusUdgivet - 2014

Fingeraftryk Dyk ned i forskningsemnerne om 'Optical impact of an Emiliania huxleyi bloom in the frontal region of the Barents Sea'. Sammen danner de et unikt fingeraftryk.

Citationsformater