1. 2600 High Latitude Issues

2. 2610 Data Editing AlgorithmInterestApplicability E1E2ENTPJ1J2G1C2 MSS based editingImproved data editingXXXxxxxx Fine tuned range and geophysical editing criterias Improved data screeningxXxxxxx High latitude data editing improved considerably with ENVISAT compared with the ERS satellites, there is however still editing problems close to sea ice. A new editing based on deviation from a MSS will be implemented. Evaluate the proposed new algorithms in WP2000 in high latitudes.

3. Refine data editing

4. 2620 Range and Geophysic Corr AlgorithmInterestApplicability E1E2ENTPJ1J2G2C2 Seasonal correctionBetter mean sea surface XXXx Improved ocean tide correction Better sea level retrieval. XXXXXXXX Strong seasonality in i.e., ICESAT means. Compute MSS independent of seasonality

5. Seasonal SSH correction Derived by zonal amplitude adjustment of GECCO using satellite altimetry. Download ftp.space.dtu.dk/pub/DTU10

6. New Ocean tide Model DTU10OT Dataset and Number Wave Resolution (°) and RMSe (cm) DTU10FES2004EOT10aTPXO7.2GOT4.7AOTIM 0.125° 0.25°0.5°5 km (150) Arctic (184) M2S2K1O1M2S2K1O1 5.29 2.88 2.73 1.74 5.80 2.93 2.84 1.89 5.79 2.93 2.84 1.90 13.36 4.22 3.73 8.25 7.28 3.47 3.70 1.85 18.77 7.61 4.32 2.11 RSS6.847.347.3316.689.06 CADA00.10 10 km (36) Antarctic (37) M2S2K1O1M2S2K1O1 2.83 3.84 4.03 4.67 3.17 3.82 4.31 4.85 3.15 3.82 4.28 4.82 4.65 4.56 5.18 4.73 4.86 4.40 6.72 5.46 4.05 4.55 4.78 3.93 RSS7.808.178.139.5710.86 Adjustment of FES2004 using: 18Y: T/P+J1+J2, 4Y: T/P+J1, 14Y: E2+N1, 6Y: G1 Use of seasonal cycle significantly improves Arctic tidal modelling – particularly K1/P1 Download ftp.space.dtu.dk/pub/DTU10

7. 2630 Improved Sea Level in areas of sea ice InterestApplicability E1E2ENTPJ1J2G2C2 Ice sheet concentration & thickess reduction improved spatial and temporal SSH mapping Xx Option: Sea-ice retracking improved spatial and temporal SSH mapping. XXX Methods for integrating information of sea ice coverage and thickness through corporation with the Sea Ice ECV will be used to define regions WHERE improved sea level determination can be carried out. Within reasonably sea ice concentration sea surface height can be estimated/improved by i.e. using info from open leads in the ice.

8. Improved sea level (July 1-7, 2009) Left is CorSSH, 7 Days JA+N1 data Right DUACS grid East-west dipole structure visible. Dipole visible in many weekly grids Grid based on CLS01 MSS Mean SLA offset (CorSSH = 5.8 cm DUACS 6.1 cm)

9. Using DTU10 MSS Raw CorSSH dataRaw RADS data. Substitute CLS01 with DTU10MSS (consistent range corrections applied) Mean SLA offset: CorSSH = 0.0 cm RADS = 0.1 cm Reason for dipole: Difference in applied range corrections for SLA product and CLS01MSS determination

10. Enhanced processing. Left CorSSH (7 Days J1+N1 data)Right RADS data. Interpolated, J1-N1 mission bias adjustment, Large Wavelength Corr replaced with regional X-over adjustment Using remove/restore with seasonal SSH effect. Difference: Editing ???? – Corr: RADS and CorSSH are nearly identical

11. 2640 Improved Sea Level Trend InterestApplicability E1E2ENTPJ1J2G2C2 MSS / MDTImproved MSS /MDT XXXx Sea Level TrendImproved sea level trend. XXx Algorithms for improved data editing (WP2610), and corrections of seasonal sea-ice cover and seasonal sea level signal renders data independent of seasonal icecover (WP2620). Improved determination of SSH in moderate concentration of sea ice (WP2630). Time series of sea level anomalies and computations of sea level trends (through the satellite periods) at high latitudes will be carried out WORK IN PROGRESS