[en] Polynyas are an important yet poorly understood phenomena of high latitude oceans. A storm event during late December 2013 with down-fjord winds of up to 25m/s forced the collapse of the landfast ice over the Young Sound (YS) fjord outlet in northeast Greenland. This storm created a coastal polynya that was further maintained by several consecutive wind events until early March 2014. During the polynya period, three landfast ice-tethered oceanographic moorings recorded an enhanced surface layer (~0-40m) transport towards the mouth of YS and a layer below (~40-140m) flowing into the fjord and supplying the interior with cool and saline water from the polynya. Subsequent CTD transects in May 2014 reveal that this lower layer contained polynya originated cool, saline and oxygen enriched water with oxygen concentrations significantly exceeding values from the previous summer. Salt balance bulk estimates show that the polynya generated a sufficient amount of brine to ventilate the fjord interior.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Dmitrenko, Igor A.; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada
Kirillov, Sergey A.; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada
Rysgaard, Søren; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada ; Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland ; Arctic Research Centre, Aarhus University, Århus, Denmark
Barber, David G.; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada
Babb, David G.; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada
Pedersen, Leif Toudal; Danish Meteorological Institute (DMI), Copenhagen, Denmark
Koldunov, Nikolay V.; Institute of Oceanography, University of Hamburg, Germany
Boone, Wieter; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada
Crabeck, Odile ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) ; Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada
Mortensen, John; Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland
Language :
English
Title :
Polynya impacts on water properties in a Northeast Greenland fjord
Aagaard K., Coachman L.K. The east Greenland current north of Denmark strait, part I. Arctic 1968, 21:181-200.
Aagaard K., Coachman L.K., Carmack E. On the halocline of the Arctic Ocean. Deep Sea Res. Part A 1981, 28(6):529-545. 10.1016/0198-0149(81)90115-1.
Anderson L.G., Falck E., Jones E.P., Jutterström S., Swift J.H. Enhanced uptake of atmospheric CO2 during freezing of seawater: a field study in Storfjorden, Svalbard. J.Geophys. Res. 2004, 109:C06004. 10.1029/2003JC002120.
Bauch D., Hölemann J.A., Dmitrenko I.A., Janout M.A., Nikulina A., Kirillov S.A., Krumpen T., Kassens H., Timokhov L. Impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters. J.Geophys. Res. 2012, 117:C00G12. 10.1029/2011JC007282.
Barber D.G., Massom R.A. The role of sea ice in Arctic and Antarctic Polynyas. Elsevier Oceanography Series 2007, vol. 74:1-54. 10.1016/S0422-9894(06)74001-6. W.O. Smith, D.G. Barber (Eds.).
Beitsch A., Kaleschke L., Kern S. Investigating high-resolution AMSR2 sea ice concentrations during the February 2013 fracture event in the Beaufort sea. Remote Sens. 2014, 6(5):3841-3856. 10.3390/rs6053841.
Bendtsen J., Mortensen J., Rysgaard S. Seasonal surface layer dynamics and sensitivity to runoff in a high Arctic fjord (Young Sound/Tyrolerfjord, 74°N). J.Geophys. Res. 2014, 10.1002/2014JC010077.
Cottier F.R., Nilsen F., Inall M.E., Gerland S., Tverberg V., Svendsen H. Wintertime warming of an Arctic shelf in response to large-scale atmospheric circulation. Geophys. Res. Lett. 2007, 34:L10607. 10.1029/2007GL029948.
Cottier F.R., Nilsen F., Skogseth R., Tverberg V., Skarthhamar J., Svendsen H. Arctic Fjords: a Review of the Oceanographic Environment and Dominant Physical Processes 2010, vol. 344(1):51-60. Geological Society, London, Special Publications. 10.1144/SP344.54.
Dmitrenko I., Tyshko K., Kirillov S., Hölemann J., Eicken H., Kassens H. Impact of flaw polynyas on the hydrography of the Laptev Sea. Glob. Planet. Change 2005, 48:9-27. 10.1016/j.gloplacha.2004.12.016.
Dmitrenko I.A., Kirillov S.A., Tremblay L.B., Bauch D., Willmes S. Sea-ice production over the Laptev Sea shelf inferred from historical summer-to-winter hydrographic observations of 1960s-1990s. Geophys. Res. Lett. 2009, 36:L13605. 10.1029/2009GL038775.
Dmitrenko I.A., Kirillov S.A., Tremblay L.B., Bauch D., Hölemann J.A., Krumpen T., Kassens H., Wegner C., Heinemann G., Schröder D. Impact of the Arctic Ocean Atlantic water layer on Siberian shelf hydrography. J.Geophys. Res. 2010, 115(C8):C08010. 10.1029/2009JC006020.
Dmitrenko I.A., Wegner C., Kassens H., Kirillov S.A., Krumpen T., Heinemann G., Helbig A., Schröder D., Hölemann J.A., Klagge T., Tyshko K., Busche T. Observations of supercooling and frazil ice formation in the Laptev Sea coastal polynya. J.Geophys. Res. 2010, 115:C05015. 10.1029/2009JC005798.
Farmer D.M., Freeland H.J. The physical oceanography of fjords. Prog. Oceanogr. 1983, 12:147-220.
Fer I., Skogseth R., Haugan P.M. Mixing of the Storfjorden overflow (Svalbard Archipelago) inferred from density overturns. J.Geophys. Res. 2004, 109:C01005. 10.1029/2003JC001968.
Fofonoff P., Millard R.C. Algorithms for computation of fundamental properties of seawater. UNESCO Tech. Pap. Mar. Sci. 1983, 44:53.
Glud R.N., Rysgaard S., Kühl1 M. Alaboratory study on O2 dynamics and photosynthesis in ice algal communities: quantification by microsensors, O2 exchange rates, 14C incubations and a PAM fluorometer. Aquat. Microb. Ecol. 2002, 25:301-311.
Krumpen T., Hölemann J.A., Willmes S., Morales Maqueda M.A., Busche T., Dmitrenko I.A., Gerdes R., Haas C., Heinemann G., Hendricks S., Kassens H., Rabenstein L., Schröder D. Sea ice production and water mass modification in the eastern Laptev Sea. J.Geophys. Res. 2011, 116:C05014. 10.1029/2010JC006545.
Martin S., Kauffman P. Afield and laboratory study of wave dumping by grease ice. J.Glaciol. 1981, 27:283-313.
Mauritzen C. Production of dense overflow waters feeding the North Atlantic across the Greenland Sea - Scotland Ridge. Part 1: evidence for a revised circulation scheme. Deep-Sea Res. 1996, 43:769-806.
Pedersen J.B.T., Kaufmann L.H., Kroon A., Jakobsen B.H. The Northeast Greenland sirius water polynya dynamics and variability inferred from satellite imagery. Dan. J. Geogr. 2010, 110(2):131-142.
Rudels B. Haline convection in the Greenland Sea. Deep Sea Res. Part A 1990, 37(9):1491-1511. 10.1016/0198-0149(90)90139-M.
Rudels B., Fahrbach E., Meincke J., Budeus G., Eriksson P. The East Greenland current and its contribution to the Denmark strait overflow. ICES J. Mar. Sci. 2002, 59:1133-1154.
Rysgaard S., Glud R.N. Carbon cycling in arctic marine ecosystems. Case study young sound. Meddelelser Greenl., Bioscience 2007, 58:214. The Comm. for Sci. Res. in Greenl., Copenhagen.
Rysgaard S., Vang T., Stjernholm M., Rasmussen B., Windelin A., Kiilsholm S. Physical conditions, carbon transport and climate change impacts in a NE Greenland fjord. Arct. Antarct. Alp. Res. 2003, 35:301-312.
Shcherbina A.Y., Talley L.D., Rudnick D.L. Dense water formation on the northwestern shelf of the Okhotsk Sea: 2. Quantifying the transports. J.Geophys. Res. 2004, 109:C09S09. 10.1029/2003JC002197.
Skogseth R., Nilsen F., Smedsrud L.H. Supercooled water in an Arctic polynya: observations and modeling. J.Glaciol. 2009, 55(189):43-52. 10.3189/002214309788608840.
Skogseth R., Fer I., Haugan P.M. Dense-water production and overflow from an Arctic coastal polynya in Storfjorden. The Nordic Seas: an Integrated Perspective 2013, American Geophysical Union, Washington, D. C. 10.1029/158GM07. H. Drange, T. Dokken, T. Furevik, R. Gerdes, W. Berger (Eds.).
Straneo F., Heimbach P. North Atlantic warming and the retreat of Greenland's outlet glaciers. Nature 2013, 504:36-43.
Tamura T., Ohshima K.I. Mapping of sea ice production in the Arctic coastal polynyas. J.Geophys. Res. 2011, 116:C07030. 10.1029/2010JC006586.
Winsor P., Bjoerk G. Polynya activity in the Arctic Ocean from 1958 to 1997. J.Geophys. Res. 2000, 105:8789-8803. 10.1029/1999JC900305.
