ESA Sea Level Climate Change Initiative. Sea Level CCI project. Phase II 1 st annual review

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1 ESA Sea Level Climate Change Initiative Sea Level CCI project Phase II 1 st annual review

2 ESA Sea Level Climate Change Initiative Improvements in coastal sea level measurements WP2300 Improvement of sea level measurements in coastal areas Paolo Cipollini, Francisco Mir Calafat, National Oceanography Centre, UK Joana Fernandes, Clara Lázaro, Faculdade de Ciências, Universidade do Porto, Portugal

3 Rationale Sea Level changes impact society mostly at the coast impacts on coastal management/defences changes in occurrence of extreme events SL_cci will truly be complete if and when it fills the gap between the open ocean and the coast Fortunately, coastal altimetry is now reaching the level of maturity that makes possible the extension of the Sea Level ECV to the coastal zone

4 WP2300: sub-wps focus on improvements in data screening, data filtering and corrections WP2310: improved Wet Tropo correction in the coastal zone (UoP) dedicated sub-wp as this correction has exceptional impact WP2320: screening/filtering of high-rate data and identification of other crucial corrections (NOC, with review by UoP) (excluding retracking, dealt with in WP2700) WP2330: Total relative sea level at the coast (NOC, with review by UoP)

5 (X) (X) 1 It is expected that at least some of the corrections and processing recommendations from WP2320 will apply also to those missions (GFO, Cryosat-2, AltiKa), although their data will not be directly analyzed.

6 Validation regions for WP2300 Reg A Reg B

7 WP2310 Wet Tropo GPD example Variance differences (cm 2 ) function of distance from coast GPD Comp ERS-1 GPD ERA See Joana s Presentation - next ERS-2 GPD Comp GPD ERA Envisat GPD Comp GPD ERA

8 WP2320 Improvement of screening/corrections in coastal areas Evaluate all Phase 1 corrections (except Wet Tropo) i.e. switch them on/off and compute Sea Level Evaluation is by comparison with TGs in RegA and RegB, with correlations as function of coastal distance and coastal proximity parameter Identify most significant contributors to error budget (we already expect Dry Tropo and SSB to be important) Investigation of screening and filtering of hi-rate data again by comparison with TGs, looking in particular at the correct recovery of sea level trends try different screening thresholds and strategies, various filter sizes find optimum trade-off between quality and quantity

9 Output SSH and most significant corrections as identified in this WP, over RegA and RegB, for TP,J1,J2, ERS-1/2, Envisat. recommendations on optimal screening and filtering Internal report for ATBD (D2.1) contribution. Oral presentation during a project meeting (PM4 May 2015).

10 WP2330 Total Relative Sea Level (TRSL) at the coast TRSL = sum of the global mean rise plus the regional variability plus the local vertical land motion an important parameter in the design of defence infrastructures only few stations have climate-quality vertical land movement information early list in Santamari a-go mez et al., 2012 updated info on SONEL web site: absolute/relative SL trends for GPS-monitored sites We select ~10 amongst those available in RegA and RegB and verify the performance of the

11 Stability of stations is available Map/list of selected from stations

12 Stability of stations is available from

13 The final question Can we reliably compute this curve (and the rate) for the global coastal zone? Scharroo, CAW-3, 2009