Stefanie Semper Héðinn Valdimarsson Steingrímur Jónsson Kent Moore Bob Pickart Circulation and convection in the Iceland Sea in winter 201516 Iceland Sea August 2015 Semper et al submitted for publication ID: 798915
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Slide1
<Foliennummer>
Kjetil Våge
Stefanie Semper
Héðinn Valdimarsson
Steingrímur JónssonKent MooreBob Pickart
Circulation and convection in the Iceland Sea in winter 2015-16
Iceland Sea
August 2015
Slide2Semper et al. (submitted for publication)
Slide33 gliders deployed from summer/fall 2015 to spring 2016
Slide4Double cyclonic gyre in the Iceland Sea
de Jong et al. (2018)
Slide5Iceland Sea Gyre circulation
Slide6Slide7Slide8Transport: 1.9 Sv
Slide9Transport: 1.6 Sv
Slide10Swift and Aagaard (1981)
Volumetric analysis
Mean temperature and salinity above σ
θ
= 28.05 kg/m3 in summer 1974
Slide11Swift and Aagaard (1981)
Volumetric analysis
Mean temperature and salinity above σ
θ
= 28.05 kg/m3 in winter 1975
Mean temperature and salinity above σθ = 28.05 kg/m3 in summer 1974
Slide12Volumetric analysis
Swift and Aagaard (1981)
Slide13Volumetric analysis
Swift and Aagaard (1981)
Slide14Volumetric analysis
Swift and Aagaard (1981)
Slide15Volumetric analysis
Increase in upper Arctic Intermediate Water (-1 – 2 ⁰C, 34.7 – 34.9) from 10 or 12% to 22%
Swift and Aagaard (1981)
Slide16Data from gliders, ships, and Argo floats
Slide17Slide18Slide19Slide20Slide21Slide22Increase in upper Arctic Intermediate Water from 46% to 57%.
The larger volume of this water mass is due to deepening of 28.05 kg/m
3
isopycnal from about 300 m to 600 m between winters 1974-75 and 2015-16
Winter 1974-75: ~2 Sv formation of upper AIWWinter 2015-16: ~0.5 Sv formation of upper AIW
2⁰C
-1⁰C
34.7
34.9
Slide23Heat fluxes from the Japanese 55-year reanalysis (JRA-55) over the Iceland Sea
Winter 1974-75: 131 W/m
2
Winter 2015-16: 61 W/m
2
Slide24Slide25Slide26Slide27Production of ≈ 0.7 Sv
Slide28Slide29Decrease of ≈ 0.1 Sv
Slide30Historical hydrographic data (1980-2015)
Slide31Historical hydrographic data (1980-2015)
Slide32Slide33Slide34Slide35Slide36Slide37Slide38Slide39Local water mass transformation in the Iceland Sea may not be so important as a source for the NIJ. Rather, the Iceland Sea appears to be more of a transit region for denser water masses formed to the west and the north.