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The Kongsfjorden Transect: Seasonal and Inter-annual Variability in Hydrography

  • Vigdis TverbergEmail author
  • Ragnheid Skogseth
  • Finlo Cottier
  • Arild Sundfjord
  • Waldemar Walczowski
  • Mark E. Inall
  • Eva Falck
  • Olga Pavlova
  • Frank Nilsen
Chapter
Part of the Advances in Polar Ecology book series (AVPE, volume 2)

Abstract

The Kongsfjorden conductivity, temperature and depth (CTD) Transect has been monitored annually since 1994. It covers the full length of the fjord and the shelf, and the upper part of the shelf slope outside Kongsfjorden. In addition to CTD profiles, data from vessel-mounted Acoustic Doppler Current Profiler (ADCP) and moorings have been collected. Previous studies noted that Atlantic Water (AW) from the West Spitsbergen Current was observed in the fjord every summer, but to a varying extent. The prolonged monitoring provided by the Kongsfjorden Transect data set examined here reveals continuous variations in AW content and vertical distribution in the fjord, both on seasonal and inter-annual timescales. Our focus in this paper is on this variable content of AW in Kongsfjorden, the forcing mechanisms that may govern the inflow of this water mass, and its distribution in the fjord. We classify three winter types linked to three characteristic scenarios for winter formation of water masses. During the historically typical winters of type “Winter Deep”, deep convection, often combined with sea ice formation, produces dense winter water that prevents AW from entering Kongsfjorden. Summer inflow of AW starts when density differences between fjord and shelf water allows for it, and occurs at some intermediate depth. During winters of type “Winter Intermediate”, AW advects into the fjord along the bottom via Kongsfjordrenna. Winter convection in Kongsfjorden will then be limited to intermediate depth, usually producing very cold intermediate water. Deep AW inflow continues during the following summer. A winter of type “Winter Open” seems to develop when open water convection produces very dense shelf water, and AW winter advection into Kongsfjorden occurs at the surface. Summer AW inflow is rather shallow after such winters. We find that variations between Winter Deep and Winter Intermediate winters are due to inherent natural variability. However, the Winter Open winters seem to be a consequence of the general trend of atmospheric and oceanic warming, and, more specifically, of the decreasing sea ice cover in the Arctic region. The Winter Open winters have all occurred after an unusual flooding of AW onto the West Spitsbergen shelf in February 2006.

Keywords

Kongsfjorden Atlantic Water Hydrography Water masses Exchange 

Abbreviations

ADCP

Acoustic Doppler Current Profiler

ArW

Arctic Water

AW

Atlantic Water

CTD

Conductivity Temperature Depth

ESC

East Spitsbergen Current

GSW

Gibbs SeaWater

IOPAN

Institute of Oceanology, Polish Academy of Sciences

IW

Intermediate Water

LW

Local Water

NPI

Norwegian Polar Institute

PSS78

Practical Salinity Scale 1978

SAMS

Scottish Association for Marine Science

SNR

Signal to Noise Ratio

SPC

Spitsbergen Polar Current

SW

Surface Water

TAW

Transformed Atlantic Water

TEOS-10

Thermodynamic Equation of SeaWater 2010

TS

Temperature-Salinity

UiB

University of Bergen

UNIS HD

UNIS Hydrographic Database

UNIS

The University Centre in Svalbard

WCW

Winter Cooled Water

WSC

West Spitsbergen Current

Notes

Acknowledgements

Ragnheid Skogseth (RS) prepared and shared CTD data from the UNIS Hydrographic database (UNIS HD) with data collected by NPI, UNIS, IOPAN and SAMS or extracted from public databases like The Norwegian Marine Data Centre (NMDC at the imr.no), the PANGAEA database (AWI) and ICES. Funding for RS and the construction of the UNIS HD merits REOCIRC (Remote Sensing of Ocean Circulation and Environmental Mass Changes, a Research Council of Norway project no. 222696/F50). The Norwegian Polar Institute provided CTD data from July 2015 and July 2016 through the MOSJ program. The work contributes as well to the project FjoCon 225218/E40, financed by the Norwegian Research Council. We thank Colin Griffiths for overseeing the SAMS mooring programme supported by the UK Natural Environment Research Council (Oceans 2025 and Northern Sea Program) and the Research Council of Norway (projects Cleopatra: 178766, Cleopatra II: 216537, and Circa: 214271/F20). Contribution by FC and MEI was undertaken through the Scottish Alliance for Geoscience Environment and Society (SAGES).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Vigdis Tverberg
    • 1
    Email author
  • Ragnheid Skogseth
    • 2
  • Finlo Cottier
    • 3
    • 4
  • Arild Sundfjord
    • 5
  • Waldemar Walczowski
    • 6
  • Mark E. Inall
    • 3
    • 7
  • Eva Falck
    • 2
    • 8
  • Olga Pavlova
    • 5
  • Frank Nilsen
    • 2
    • 8
  1. 1.Faculty of Biosciences and AquacultureNord UniversityBodøNorway
  2. 2.The University Centre in SvalbardLongyearbyenNorway
  3. 3.Scottish Association for Marine Science, Scottish Oceans InstituteObanUK
  4. 4.Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and EconomicsUiT The Arctic University of NorwayTromsøNorway
  5. 5.Norwegian Polar Institute, Fram CentreTromsøNorway
  6. 6.Institute of Oceanology, Polish Academy of ScienceSopotPoland
  7. 7.Department of GeosciencesUniversity of EdinburghEdinburghUK
  8. 8.Geophysical InstituteUniversity of BergenBergenNorway

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