Overview and details of the sessions for this conference. Please select a date and a session for detailed view (with abstracts and downloads if available).
11:00 - 11:45 Oral ID: 150 / S.2.3: 1 Dragon 6 Oral Presentation OCEAN & COASTAL ZONES: 95373 - Marine dynamic environment monitoring combining conventional and new generation radar altimeters over the coastal and polar ocean
Research On Width Swath Radar Altimeter Data Analysis And Multi-altimeters Data Fusion
Jungang Yang1, Ole Andersen2, Yongjun Jia3, Shengjun Zhang4
1First Insititute of Oceanography, Ministry of Natural Resources, China; 2Technical University of Denmark, Denmark; 3National Satellite Ocean Application Service, China; 4Northeastern University, China
The emergence of wide swath radar altimeter provides a new observation method for ocean dynamic environment monitoring, which can achieve two-dimensional synchronous observation of sea surface height, wave height and sea surface wind speed. The SWOT satellite launched in December 2022 is equipped with Ka-band Radar Interferometer (KaRIn), which can achieve two-dimensional observation of marine dynamic environment. Based on SWOT ocean observation data, the spectral analysis method is used to evaluate the observation ability of ocean sub-mesoscale processes in sea surface height data, and buoy data is used to evaluate the accuracy of significant wave height and sea surface wind speed.
The spatial and temporal distribution of satellite altimeter along track observation data is sparse, making it difficult to comprehensively capture the spatial and temporal structure of ocean circulation. The fusion of multi-source altimetry data can compensate for the shortcomings of single satellite altimetry observation data and obtain more comprehensive sea surface height information. Based on ocean reanalysis data, the spatiotemporal correlation scale of global ocean dynamic processes is calculated and the variable spatiotemporal scale optimal interpolation method is developed for multi-source satellite altimetry data fusion. Research on multi-source satellite altimetry data fusion based on two-dimensional variational method, efficiently fusing multi-source satellite altimetry data by fully utilizing the error characteristics and covariance information of background field and observation data, optimizing the accuracy of fusion results and improving their spatial resolution. Temporal dynamic interpolation of sea surface height anomalies based on quasi geostrophic models is developed by introducing SST data as physical constraints to more accurately describe SLA temporal evolution and improve the temporal resolution of fusion results. The Northwest Pacific Ocean is taken as study area to conduct data fusion experiments and evaluate the developed data fusion method.
11:45 - 12:30 Oral ID: 169 / S.2.3: 2 Dragon 6 Oral Presentation OCEAN & COASTAL ZONES: 95451 - Lofoten Basin eddies and its impact on Atlantic Water heat transport towards the Arctic (LoWa)
Lofoten Basin eddies and its influence on the Atlantic Water heat transport towards the Arctic (LOWA)
Roshin P. Raj1, Huizi Dong2, Julien Brajard1, Antonio Bonaduce1, Laurent Bertino1, Meng Zhou2, Johnny Johannessen1
1Nansen Environmental and Remote Sensing Center (NERSC), Norway, Norway; 2Shanghai Jiao Tong University, Shanghai, China
The Lofoten Basin (LB) is located along the advective path of Atlantic Water (AW) is the most eddy active part of the Nordic Seas. A main feature of the LB circulation is the spinning up off eddies from the Norwegian Atlantic Current, which in turn transports warm AW into the basin. The AW transported into the basin interior is found to penetrate deep down to 1000 m, and not surprisingly, the LB is the largest heat reservoir in the Nordic Seas. The eddy shedding from the slope current to the deeper areas of the basin, transports heat to the basin interior and thus mediates the gradual cooling of the slope current on its way toward the Arctic. This is of great importance since AW transported to the Arctic Ocean through the Nordic Seas plays a major role in the global climate system. Furthermore, this also links to the “Atlantification”, a commonly used term for the increasing influence of AW in the Arctic Ocean, having a large impact on the Arctic marine ecosystem.
The overall objective of LoWa is to quantify the impact of ocean eddies on the heat transport across the LB affecting Atlantification. To address the overall objective LoWa uses a holistic approach, thanks to the outstanding opportunities offered by the: available satellite constellations with multi-sensor covariability/synergies; in-situ observational networks, gliders and ARGO drifters; co-location of in-situ and remote-sensed data and data driven Artificial Intelligence (AI) methods. Such an approach also extends the possibility to not only investigate ocean mesoscale eddies but also the sub-mesoscale eddies that are even less studied in comparison to mesoscale eddies.
We will report ongoing activities associated with mesoscale eddies in the Lofoten Basin. In addition, we will also present results of a recent study (Dong et al., 2025, manuscript in revision, Nature Communication), focusing on the Warm Rings in Mesoscale Eddies in a Cold Straining Ocean. In here we show the role of submesoscale heat transport as the primary mechanism for substantial heat loss from AW in the Lofoten Basin.
