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Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Saskia Esselborn, Andrea Homberg, Tilo Schöne and Roland Schmidt.

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Presentation on theme: "Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Saskia Esselborn, Andrea Homberg, Tilo Schöne and Roland Schmidt."— Presentation transcript:

1 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Saskia Esselborn, Andrea Homberg, Tilo Schöne and Roland Schmidt GFZ Potsdam Basin Scale Mass Variations in the Atlantic Ocean from Altimeter, in situ and GRACE Data

2 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Total: Jason-1 Steric: Argo drifter Mass specific: GRACE

3 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Data Monthly mean deviations 2002 to April 2007 (52 months common), spatial Hamming filter (700 km half length width) Altimeter: Jason-1, state of the art correction models, updated radiometer correction, JGN3 orbit GRACE: GFZ-RL04, water level equivalent, monthly GAB-correction readded, geocenter motion correction from GPS (Heflin, JPL) In-situ data (steric): gridded Argo data, level of no motion at 1950 m (CORIOLIS project, Ifremer )

4 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 RMS [cm] Jason-1Argo

5 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 RMS [cm] GRACE 3 Jason-1 minus Argo 6

6 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Mean Sea Level North Atlantic Blue: total (Jason-1) Purple: total (steric+mass ) Red: steric (Argo) Green: mass (GRACE)

7 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 RMS [cm] annual cycle substracted Argo Jason-1

8 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 RMS [cm] annual cycle substracted GRACE 3 Jason-1 minus Argo 6

9 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Annual cycle Amplitude [cm] ArgoJason-1

10 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Annual cycle Amplitude [cm] GRACE 3 Jason-1 minus Argo 6

11 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Crosscorrelation explained variance [%] Jason-1 minus Argo,GRACE Jason-1, ArgoJason-1, GRACE 7560

12 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Crosscorrelation without annual cycle Jason-1 minus Argo,GRACE Jason-1, ArgoJason-1, GRACE

13 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Subtropics Subpolar Subtropics Subpolar

14 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Mass related sea level deviations Red: GRACE Blue: Jason-1 minus Argo (total-steric )

15 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Sea level deviations Blue: total (Jason-1) Purple: total (steric+mass) Red: steric (Argo) Green: mass (GRACE) NA SubtropicsNA Subpolar

16 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Trends mm/year SAtlantic NAtlantic total (Jason-1) 4.60.6 steric (Argo) 1.40.2 mass (GRACE)-0.21.1 mass (GRACE )-0.60.4 without geocenter correction

17 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Sea level differences [cm] Blue: total (Jason-1) Green: mass (GRACE) South Atlantic minus North Atlantic SAtlantic Subtropics minus Subpolar

18 Grace Science Team Meeting+DFG Schwerpunktprogramm 1257 Symposium, 15-17. September 2007 Summary Good agreement between total and steric sea level for most areas and times Argo: Problems with data coverage and bias/trend, improvements expected soon Mass related sea level from altimetry and Argo data is probably less accurate than GRACE data Geocenter correction influences the trend estimation from GRACE data Agreement between the three data sets is sufficient for most times in the subpolar and subtropic North Atlantic Total and mass related sea level difference between North and South Atlantic is in phase

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