1 ICES/NAFO Symposium Santander May 11 2011 Seasonal to interannual variability of temperature and salinity in the Nordic Seas: heat and freshwater budgets Katrin Latarius Detlef Quadfasel ZMAW Institut für Meereskunde Hamburg Funding: Deutsche Forschungsgemeinschaft (SFB512) EU-MERSEA, EuroArgo, THOR
ICES/NAFO Symposium Santander May 11 2011. Seasonal to interannual variability of temperature and salinity in the Nordic Seas: heat and freshwater budgets Katrin Latarius Detlef Quadfasel ZMAW Institut für Meereskunde Hamburg Funding: Deutsche Forschungsgemeinschaft (SFB512) - PowerPoint PPT Presentation
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ICES/NAFO Symposium Santander May 11 2011
Seasonal to interannual variability of temperature and salinityin the Nordic Seas:heat and freshwater budgets
Katrin LatariusDetlef QuadfaselZMAWInstitut für Meereskunde Hamburg
The development of the heat and freshwater content in the ocean is derived from ARGO-float profile data
Lateral exchange and vertical convective mixing is estimated as the residuumsummer: only lateral exchangewinter: lateral + vertical exchange
Seasonal cycle of heat and freshwaterfluxes,from 7 meteorological models
annual mean:-53 ± 10 W/m2 22 ± 15 mm/mon
Latarius & Quadfasel, 2010
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Greenland Sea Gyre: heat is imported laterally (50-1500m) and exported to the atmosphere and in the upper 50m freshwater is imported from the atmosphere and
exported laterally
The surrounding of the gyre between 50 – 1500m looses heat and salt by exchange with the Greenland Sea Gyre
Nordic Seas:~ 25/14% of total heat/freshwatertransformation∆T=3°C∆S=0.05
~ 50%west ~ 15% east ~ 35%
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Conclusion
Greenland Sea, Norwegian Basin, Lofoten Basin (and the Iceland Plateau) of the Nordic Seas transform and redistribute the water masses at least down to 600m
residence time within the basins is long winter cooling forces deep vertical mixing
~ 50% of the water mass transformation of the Nordic Seas takes please in the basins (they account for only 25% of the total area)
contribution of the Nordic Seas to the total water mass transformation from Atlantic inflow to the overflow is only approx. 25%transformation in the eastern part is dominant
climate induced increase of freshwater in the surface layer of the western part will at most influence 15% of the total tranformation!
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Thank you for your attention!
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Dataset
Dataprocessing:
Receiving data from Argos, converting from hex to decimal and real-time quality check at Coriolis Data Centre(within 1 day after profile is measured)
Quality check by eye
Delayed mode quality control for S at ARGO standard: Objective mapping procedure to compare with recent and historical CTD data (Böhme, Send, 2005), correction if difference is larger than 0.01 psu.(every ½ to 1 year)
Using only profiles within f/h contour of GS gyre
Computing monthly mean values of all floats in the gyre
Deleting extreme values
2 from 8 floats have been corrected because of distinct offset/trend in S