The general objective of this research project is to understand the dynamics of the phytoplankton spring bloom and determine its role in the Arctic Ocean of tomorrow, including for human populations.
Climate change has triggered fundamental modifications of marine biotopes in the Arctic Ocean (AO). The decrease in the extent of the ice pack during summer has led to a 20% increase in pan-Arctic primary production (PP) over the last decade. Phytoplankton blooms now occur earlier in several parts of the AO. In other parts, the structure of the phytoplankton community is shifting toward smaller species, typical of more oligotrophic conditions and some species found in warmer waters now migrate into the Arctic Ocean.
Phytoplankton grow in the top tens of meters of both ice-free and ice-covered waters. The phytoplankton spring bloom (PSB) that develops at the ice-edge accounts for >50% of annual primary production in the AO and is generally associated with both large energy transfer to higher trophic levels and export of carbon to the bottom. In turn, the culture, health and economic capacity building of Northerners are closely associated with marine resources supported by the PSB. The Arctic PSB develops in the seasonally-covered ice zone (SIZ), the extent of which is expected to increase significantly during the next years, possibly over the whole AO as early as in 2030. How the PSB will evolve in this context is currently unknown.
Or will the modifications in physical properties of the AO limit the PSB and PP?
Will it thereby make the AO ecosystems more productive?
How will biodiversity respond to and/or impact on those changes?
To be able to answer these questions, it is necessary to understand with great details and quantitatively the physical, chemical and biological processes involved in the preconditioning, development and decline of the PSB. Since this is a transient phenomenon occurring in a remote, complex and harsh environment, such a detailed understanding has not yet been achieved.
The general objective of this research project is to understand the dynamics of the PSB and
determine its role in the Arctic Ocean of tomorrow, including for human populations. More
specifically, we want to:
1
understand the key physical, chemical and biological processes governing/which governed the
PSB,
2
identify the key phytoplankton species involved in the PSB and model their growth under
various environmental conditions,
3
predict the fate of the PSB and related carbon transfer through the food web and toward the
bottom sediments over the next decades.
First, a PSB event will be monitored during 2015 in the Baffin Bay from its onset under melting sea
ice in May to its conclusion within the SIZ in July. The distribution of relevant physical, chemical
and biological properties will be described at various time and space scales using a fleet of
profiling floats and gliders and an autonomous underwater vehicle, all equipped with a suite of
physical and bio-optical sensors. Process studies will be conducted from an ice camp and then from a
research icebreaker to document phytoplankton growth, nutrient assimilation and the transfer of
carbon through the food web and toward the sediment.
Second, key phytoplankton species will be isolated and grown in the laboratory under various
conditions to model their response to environmental factors and to understand their succession
during spring.
Third, a coupled physical-biological model will be optimized for simulating the PSB in the Arctic
Ocean and for predicting changes in phytoplankton communities and food web dynamics. In parallel,
past and present trends in the intensity and spatial distribution of the PSB will be documented
using a paleoceanographic approach, and using remote sensing.
Finally, interviews and bilateral discussion with local Inuit communities will enable the
documentation of changing marine productivity from a social perspective and feed into a multi-scale
integrated analysis of environment-human interactions.
Aknowledgements:
Ice camp 2015-2016
The GreenEdge project is funded by the following French and Canadian programs and agencies: ANR
(Contract #111112), CNES (project #131425), IPEV (project #1164), CSA, Fondation Total,
ArcticNet, LEFE and the French Arctic Initiative (GreenEdge project). This project would not
have been possible without the support of the Hamlet of Qikiqtarjuaq and the members of the
community as well as the Inuksuit School and its Principal Jacqueline Arsenault. The project is
conducted under the scientific coordination of the Canada Excellence Research Chair on Remote
sensing of Canada's new Arctic frontier and the CNRS & Université Laval Takuvik Joint
International laboratory (UMI3376). The field campaign was successful thanks to the contribution
of J. Ferland, G. Bécu, C. Marec, J. Lagunas, F. Bruyant, J. Larivière, E. Rehm, S.
Lambert-Girard, C. Aubry, C. Lalande, A. LeBaron, C. Marty, J. Sansoulet, D. Christiansen-Stowe,
A. Wells, M. Benoît-Gagné, E. Devred and M.-H. Forget from the Takuvik laboratory, C.J. Mundy
and V. Galindo from University of Manitoba as well as F. Pinczon du Sel and E. Brossier from
Vagabond. We also thank Michel Gosselin, Québec-Océan, the CCGS Amundsen and the Polar
Continental Shelf Program for their in-kind contribution in polar logistic and scientific
equipment.
Amundsen 2016
The GreenEdge project is funded by the following French and Canadian programs and agencies: ANR
(Contract #111112), ArcticNet, CERC on Remote sensing of Canada's new Arctic frontier, CNES
(project #131425), French Arctic Initiative, Fondation Total, CSA, LEFE and IPEV (project
#1164). This project was conducted using the Canadian research icebreaker CCGS Amundsen with the
support of the Amundsen Science program funded by the Canada Foundation for Innovation (CFI)
Major Science Initiatives (MSI) Fund. We wish to thank officers and crew of CCGS Amundsen. The
project is conducted under the scientific coordination of the Canada Excellence Research Chair
on Remote sensing of Canada's new Arctic frontier and the CNRS & Université Laval Takuvik Joint
International Laboratory (UMI3376). The field campaign was successful thanks to the contribution
of G. Bécu, J. Lagunas, D. Christiansen-Stowe, J. Sansoulet, E. Rehm, M. Benoît-Gagné, M.-H.
Forget and F. Bruyant from Takuvik laboratory and J. Bourdon, C. Marec and M. Picheral from
CNRS. We also thank Québec-Océan and the Polar Continental Shelf Program for their in-kind
contribution in terms of polar logistics and scientific equipment.