 |
| Titel |
Control of primary production in the Arctic by nutrients and light: insights from a high resolution ocean general circulation model |
| VerfasserIn |
E. E. Popova, A. Yool, A. C. Coward, Y. K. Aksenov, S. G. Alderson, B. A. Cuevas, T. R. Anderson |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 11 ; Nr. 7, no. 11 (2010-11-11), S.3569-3591 |
| Datensatznummer |
250005058
|
| Publikation (Nr.) |
 copernicus.org/bg-7-3569-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
Until recently, the Arctic Basin was generally considered to be a low
productivity area and was afforded little attention in global- or even
basin-scale ecosystem modelling studies. Due to anthropogenic climate change
however, the sea ice cover of the Arctic Ocean is undergoing an unexpectedly
fast retreat, exposing increasingly large areas of the basin to sunlight. As
indicated by existing Arctic phenomena such as ice-edge blooms, this decline
in sea-ice is liable to encourage pronounced growth of phytoplankton in
summer and poses pressing questions concerning the future of Arctic
ecosystems. It thus provides a strong impetus to modelling of this region.
The Arctic Ocean is an area where plankton productivity is heavily influenced
by physical factors. As these factors are strongly responding to climate
change, we analyse here the results from simulations of the 1/4°
resolution global ocean NEMO (Nucleus for European Modelling of the Ocean)
model coupled with the MEDUSA (Model for Ecosystem Dynamics, carbon
Utilisation, Sequestration and Acidification) biogeochemical model, with a
particular focus on the Arctic basin. Simulated productivity is consistent
with the limited observations for the Arctic, with significant production
occurring both under the sea-ice and at the thermocline, locations that are
difficult to sample in the field.
Results also indicate that a substantial fraction of the variability in
Arctic primary production can be explained by two key physical factors: (i)
the maximum penetration of winter mixing, which determines the amount of
nutrients available for summer primary production, and (ii) short-wave
radiation at the ocean surface, which controls the magnitude of phytoplankton
blooms. A strong empirical correlation was found in the model output between
primary production and these two factors, highlighting the importance of
physical processes in the Arctic Ocean. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|