Diurnal warming in the Arctic Ocean: Observations at CMS

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Presentation transcript:

Diurnal warming in the Arctic Ocean: Observations at CMS Sonia Péré Centre de Météorologie Spatiale, Météo-France, Lannion, France SST variability meeting, Lannion 3 Nov. 2011

Outline Introduction : How to quantify DW in the Arctic ? Reference: Previous « night » vs foundation SST? Buoy observations (drifters) Application to satellite data Modelling Conclusion Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Buoys observations : drifters DW vs lst in arctic What is DW ? Buoys observations : drifters DW vs lst in arctic DW = sst -ref_sst Ref_sst= previous « night » SST : the mean SST value between 20 lst the day before and 10 lst the same day Previous night SST is DW contaminated (most of the time) Can we use foundation SST as a reference ? DW latitude >66 with drifters Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

How to determine foundation SST ? Time series for drifter 62926: lat 70.6 lon 41 Threshold on wind speed? Reference SST? Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

How to determine foundation SST Wind threshold ? Residual DW after 21 lst WIND Which Wind value leads to close the cycle ? Wind above 5m/s Summer 2012 Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

How to determine foundation SST We adopt a wind threshold > 7m/s and 10 day centered averages. Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Satellite observations Buoy 62926 Metop SST Buoy 62926 Time serie from 16 to 19 of july Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Previous night vs foundation SST Wind > 7 m/s +- 5 days Dw =sst-Foundation sst Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Previous night vs foundation SST Daily reference : The previous « night » SST Dw =SST-daily reference Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Reference vs foundation SST 03/12/2018

Previous night vs foundation SST 03/12/2018

Relative number of clear sky cases with wind > 7ms-1 July 2012 Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Modelling : swr Buoy :62926 wind Non solar fluxes Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Modelling Wind =0 on 20120717 from 00h to 19h Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Modelling Wind =0 on 20120717 from 00h to 19h + Non solar fluxes=0 Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Modelling Wind =0 on 20120717 from 00h to 19h + Non solar fluxes=0 + surface salinity =0 Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Salinity assumption? Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011

Conclusion With drifter data, a « solar warming amplitude» over several days can be determined with SST foundation With satellite data, the scarcity of wind >7m/s in clear sky does not permit to determine SST foundation (and solar warming events are difficult to quantify) The use of daily reference permits to detect Diurnal Warming. Localized amplitudes as large as 4 to 5 K are observed up to 80 North It 's difficult to simulate such amplitudes unless we make extreme assumptions. Further work : understand the origin of such large amplitudes contribute to the Lake Vanern paper Arctic SST workshop, Exeter 18-19 December 2013 SST variability meeting, Lannion 3 Nov. 2011