IAG-IASPEI 2017

講演情報

Oral

Joint Symposia » J01. Monitoring of the cryosphere

[J01-3] Monitoring of the cryosphere III

2017年8月2日(水) 13:30 〜 15:00 Room 403 (Kobe International Conference Center 4F, Room 403)

Chairs: Eric Larour (Jet Propulsion Laboratory/California Institute of Technology/NASA) , Takahiro Abe (Hokkaido University)

14:00 〜 14:15

[J01-3-03] A 25-year Arctic Sea-level Record (1991-2016) and first look at Arctic Sea Level Budget Closure

Ole Andersen1, Stine K. Rose1, Marcello Passaro2, Jerome Benveniste3 (1.DTU Space, 2.TUM Munich, 3.ESA Esrin)

A new initiative within the ESA Sea Level Climate Change initiative (SL-cci) framework to improve the Arctic sea level record has been initiated as a combined effort to reprocess and retrack past altimetry to create a 25-year combined sea level record for sea level research studies. One of the objectives is to retracked ERS-2 dataset for the high latitudes based on the ALES retracking algorithm through adapting the ALES retracker for retracking of specular surfaces (leads). Secondly a reprocessing using tailored editing to Arctic Conditions will be carried out also focusing on the merging of the multi-mission data. Finally an effort is to combine physical and empirical retracked sea surface height information to derive an experimental spatio-temporal enhanced sea level product for high latitude. The first results in analysing Arctic Sea level variations on annual inter-annual scales for the 1992-2015 from a preliminar version of this dataset is presented. By including the GRACE water storage estimates and NOAA halo- and thermo-steric sea level variatios since 2002 a preliminary attempt to close the Arctic Sea level budget is presented here. Closing the Arctic sea level budget is by no mean trivial as both steric data and satellite altimetry is both sparse temporally and limited geographically.