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ZENODO
Other literature type . 2020
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Project deliverable . 2020
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Optimization of the Greenland‐Scotland Ridge inflow arrays (D2.8)

Authors: Larsen, Karin Margretha; Hansen, Bogi; Jónsson, Steingrímur; Macrander, Andreas; Berx, Barbara; Walicka, Kamila; Østerhus, Svein;

Optimization of the Greenland‐Scotland Ridge inflow arrays (D2.8)

Abstract

Ocean warm and saline Atlantic water (AW) flows northward towards the Arctic. This water crosses the Greenland‐Scotland Ridge in three inflow branches:  the Iceland branch,  the Faroe branch and  the Shetland branch. The first monitoring of these branches was obtained along standard hydrographic sections and in the 1990s these observations were complemented by – at that time the state‐of‐the‐art technology – Acoustic Doppler Current Profilers (ADCPs) that could measure ocean currents directly. For many years the ADCPs were the backbone in transport estimates of the inflowing AW, but in order to get reliable estimates, a high number of moorings were necessary which was costly both in consumables and man‐power. Alternative methods were therefore needed. The process to optimise the inflow arrays began several years ago by the integration of Satellite Altimetry data . Over the years, more data have been obtained at the inflow arrays, including new data types, and within Blue‐Action analyses have been performed utilizing the available data in order to optimise the monitoring of the inflow arrays both with respect to cost and in order to produce more accurate estimates of AW volume, heat and salt transports. Resulting from the work undertaken in Blue‐Action, the recommendations for future monitoring the three inflow branches are as follows: Iceland branch: Combined observations from one or two ADCP moorings (including hydrographicobservations at intermediate depth) and four annual hydrographic surveys. Faroe branch: Combined observations from satellite altimetry, one ADCP mooring, three PIES (Pressure Inverted Echo Sounders), one bottom temperature logger and at least three annual hydrographic surveys. Shetland branch: A combination of gridded geostrophic surface velocities from satellite altimetry, at least three annual hydrographic cruises along the section and continued ADCP deployments at key sites (such as in the Shetland slope current).

The Blue-Action project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 727852

Jónsson,  S.  and  H.  Valdimarsson  (2012).  Water  mass  transport  variability  to  the  North  Icelandic  shelf,  1994‐

2010. ICES Journal of Marine Science. 69. 809‐815. 10.1093/icesjms/fss024. 

Macrander,  A.,  H.  Valdimarsson,  and  S.  Jónsson  (2014),  Improved  transport  estimate  of  the  East  Icelandic 

Current 2002-2012, J. Geophys. Res. Oceans, 119, 3407-3424, doi:10.1002/2013JC009517.  monitoring of volume,  heat, and salt  transport across  the GreenlandScotland Ridge  towards the Arctic” 

report)  Jochumsen, K. &  Østerhus, S. 2019b.  Monitoring the  hydrographic  structure of the Faroe  Current. Havstovan  Technical Report Nr.:  19‐02. 

report)  2019a. Monitoring  the velocity structure  of the Faroe Current.  Havstovan Technical  Report Nr.: 19‐01 

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Funded by
EC| Blue-Action
Project
Blue-Action
Arctic Impact on Weather and Climate
  • Funder: European Commission (EC)
  • Project Code: 727852
  • Funding stream: H2020 | RIA
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