Day 4

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Paper title Exploitation of enhanced altimetry datasets for investigating ocean mesoscale variability in the Nordic Seas
Authors
  1. Antonio Bonaduce Nansen Environmental and Remote Sensing Center Speaker
  2. Andrea Storto CNR ISMAR
  3. Andrea Cipollone Centro Euro-Mediterraneo sui Cambiamenti Climatici, CMCC, Italy
  4. Roshin Raj Nansen Center
  5. Johnny A. Johannessen Nansen Environmental and Remote Sensing Center
Form of presentation Poster
Topics
  • A8. Ocean
    • A8.07 Oceanographic Change of the Arctic Ocean From Space
Abstract text The inter-annual changes of the Arctic Ocean (e.g. dense water formation, meridional heat redistribution) are well-known proxies of global climate change. The ocean circulation in the high latitude seas and Arctic Ocean has significantly changed during recent decades, with significant impact on the socio-economic activities for the locals. Monitoring the Arctic environment is however non-trivial: the Arctic observing network is notably lacking the capability to provide a full picture of the ocean variability due to technological and economical limitations to sample the seawater beneath the sea ice or in the marginal ice zones. This leads to the obvious need of optimizing the exploitation of data from space-borne sensors. For more than two decades, altimetric radars measuring the sea level at millimetric precision have revolutionized our knowledge of the global mean sea level rise and oceanic circulation. Technological solutions are continuously needed and pursued to enhance the spatial resolution of the altimetric signal and enable the solution of the mesoscale dynamics, either in the design of the altimeter itself (e.g. wide-swath altimeters and SAR altimeters) or in the combined use of altimeter data from multiple bands. Newly reprocessed along-track measurements of Sentinel-3A, CryoSat-2, and SARAL/AltiKa altimetry missions (AVISO/TAPAS), optimized for the Arctic Ocean (retracking) have recently been produced in the framework of CNES AltiDoppler project. The tracks of the different satellite mission are then merged to provide altimetry maps with enhanced spatial coverage and resolution. This study is devoted to the exploitation of such satellite altimetry data in high-latitude regions. We investigate the benefits of the reprocessed altimetry dataset with augmented signal resolution in the context of ocean mesoscale dynamics. In particular, we perform a fit-for purpose assessment of this dataset investigating the contribution of eddy-induced anomalies to ocean dynamics and thermodynamics. This is done by co-locating eddies with Argo float profilers, in the areas representing the gateways for the Atlantic waters entering the Arctic and comparing them to fields derived from conventional altimetry maps in order to assess the added value of the enhanced altimetry reprocessing in the northern high latitude seas.