Cryosat-2 SAR altimetry processing and use in the Arctic Ocean. Ole Andersen, M. Jain & Lars Stenseng
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1 Cryosat-2 SAR altimetry processing and use in the Arctic Ocean Ole Andersen, M. Jain & Lars Stenseng
2 Context We investigate satellite altimetry in the Arctic Ocean for 1) Studies of long term changes 2) Mean sea surface determination. 3) MDT determination with GOCE 4) Ocean circulation. 5) Ocean tide modelling Large portion covered by sea ice Large variation in surface types
3 1 Hz Data in Arctic Ocean (April 2013) RADS etc C-2 Jason 1 & 2 HY-2 (3 days) AltiKa
4 Cryosat-2 20 Hz SAR L1B satellite altimetry (2012)
5 Large variation in surface/waveform types Classification Pulse peakiness From Laxon and Rapley (1987)
6 Classification: Stack Standard Deviation From Wingham(2006)
7 Arctic Cryosat-2 Classification Stack Standard Deviation vs Pulse Peakiness
8 Lead/Ocean classsification Summer vs Winter January May S S S September S S Distribution lead/ocean is determined by SSMI/S mask
9 Cryosat-2 SAR satellite altimetry for 2012 Percentage
10 Applying 6 SAR Empirical Retrackers Simple and rough retrackers R1 - Traditional OCOG Rtrk R2 - Traditional Threshold Rtrk R3 - Five parameter Beta Rtrk R4 Primary Peak OCOG Rtrk R5 Primary Peak Threshold Rtrk R6 - ESA Retracker Reflection Power A Pdiff < Th_stop Add next 4 points R7 Simple Threshold Retracking Range Bin Number
11 1-Hz Std deviation LEAD All values in cm OCEAN All values in cm Minumum of 6 obs/sec required, Default corr applied.
12 Peak Thress-hold retrack (R5) average 1Hz std.dev in 2º blocks 6 cm 1 cm Summer (5 month) Winter (7 month)
13 Ocean retracking (R5) 1Hz std.dev 12 cm 5 cm Summer (5 month) Winter (7 month) Ocean data could/should be retracked using i.e. SAMOSA retrackers. Notice: Only few will result in 1 Hz data
14 Retracker offsets -> absolute height. Track offset (>65N) in meters UCL04/CLS01MSS (WGS84) DTU10MSS (T/P ref frame) Found considerably higher scatter in track mean for UCL04/CLS01 MSS than DTU10MSS. We found 0.7 meter constant value (retracker offset)
15 C2 relative to UCL04/CLS01 MSS (ESA default)
16 C2 relative to DTU10MSS)
17 Mean sea surface (DTU13MSS DTU10MSS To get proper 20 Year referencing. Adjusting all C2 data to DTU10MSS Using GOCE to get MDT (Here DTU12MDT) For ocean currents.
18 Conclusion " Compared with conventional 1 Hz altimetry the 20 Hz Cryosat-2 SAR provide a wealth of new data and important information up to 88N. " Bascially the 20 Hz C2 lead data has 2-3 cm noise same or better precision as conventional 1 Hz observation " Ocean data should be retracked by SAMOSA or other retracker " Suggestion for discussion: reconsider 1 Hz computation for Arctic: " Requirement of 16 obs in 1 Hz => Removes 88% " Requirement of 10 obs in 1 Hz => Removes 59% " Requirement of 6 obs in 1 Hz => Removes 31% " New DTU13MSS/MDT to be released at ESA Living Planet Symposium in September.
19 Summary: MSS: Evaluate LFIB effects on MSS, New DTU13 MSSs (both LFIB and NoLFIB) to be released at ESA Living Planet Symposium. MDT: New DTU13 MDTs to be released at ESA Living Planet Symposium, Develop marine geoid for absolute referencing of SSHs (including error characteristics), Improve marine geoid using in-situ gravity data. The DTU12MDT mean dynamic topography model is available at:
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