Sea Ice Experiment: Dynamic Nature of the Arctic (SEDNA)
SEDNA was a international collaborative effort to improve understanding of the interaction between sea ice dynamics and Arctic climate. Read more about SEDNA. (see the bottom of this document)
The SEDNA data set is unique in that ice thickness data collection was inter-calibrated and coordinated with monitoring of the ice pack strain-rate (horizontal deformation) and measurements of internal ice stress. This experimental was designed to improve our understanding of the relationship between sea ice thickness and dynamics, investigating stress and strain-rate relationships with a comprehensive suite of spatiotemporal coincident observations.
Learn more about Sea ice Experiment - Dynamic Nature of the Arctic (SEDNA)
This is a backup of the offical SEDNA site, use the link above for the full SEDNA web page. Click here (SEDNA) for the offical data portal. Use this page only if the offical page is unavailable. This site is not quite complete nor being kept up to date.
Resources
- Download a synoptic overview or the field report of the SEDNA field campaign.
- AGU EOS Article describing the SEDNA Experiment
- Data is provided in 3 formats: Original - usually ascii with separate file format information; NetCDF - Almost all sets are converted to a common data format using NetCDF Convetion developed by co-investigator Andrew Roberts. ASCII - Most sets also contain an ascii format for researchers who do not use NetCDF. The basic format is to dump the NetCDF header with lists the variables, their units and descriptive names. Comments associated with the data set are also part of this long header". Then each column is labeled (not the case with many original submissions) and data is presented in a formatted fashion. When the orginal files are well made spreadsheets or the data is images or large gridded data, an ascii version is not provided.
SEDNA Data Portal
The SEDNA experiment was designed to observe sea ice deformation over a set of nested, cascading scales. Read more on data organization. (see the bottom of this document)
| Variable | Point | 1km | 10km | 100km | Regional | Reference |
|---|---|---|---|---|---|---|
| Growth/Melt | IMB Buoy | HEM: inner flight | HEM: outer flight | 3.3, 4.2.3, 4.2.2 | ||
| Surface Stress | Meteorological Tower ADCP | NCEP/NCAR, ECMWF, NARR | NCEP/NCAR, ECMWF, NARR | 7,8 | ||
| Internal Ice Stress | Stress Buoy | Stress Sensor Array | Stress Sensor Array | Stress Sensor Array | 3.2 | |
| Strain Rate | SAR | GPS, SAR | GPS, SAR | SAR, IABP | 2.1, 3.1 | |
| Ridge Parameters | Blocks and Dives | AUV | 5, 6 | |||
| Thickness Distribution | Drill holes | Calibration transects, GPR data, Snow data, HEM | HEM: inner flight | HEM: outer flight |
ICESat HEM: Transects |
4, 2.5 |
Links to datasets
| Source | Data Type | Data (Archive) | Contact Details | Metadata & Misc |
|---|---|---|---|---|
| Buoy | IMB Buoy | ASCII, NetCDF | Don Perovich, CRREL |
Ice mass balance Metadata More on 2007B: CRREL website on Mass Balance Buoys |
| Internal Ice Stress | NetCDF, ASCII, Images | Jackie Richter-Menge, CRREL Cathy Geiger, U. Delaware | Stress sensor array About |
|
| Strain Rate | originals, ascii, netcdf | Jennifer Hutchings, UAF | Strain rates computed from GPS Drifters About | |
| GPS Drifters | NetCDF, Original files | Jennifer Hutchings, UAF | Coordinates and derived velocities from various buoys About | |
| IABP | NetCDF, ASCII, Original files | Ignatius Rigor, UW | About | |
| Cooler Buoys | ASCII | Jennifer Hutchings, UAF | ||
| Camp | ADCP | NetCDF, ASCII, originals, images | Jennifer Hutchings, UAF | about |
| Meteorological Data | NetCDF, ascii | Andrew Roberts, UAF | About Meteorological Data Synoptic overview (pdf) |
|
| CTD | NetCDF, Original files | Jeremy Wilkinson, SAMS Oban, UK | About CTD (pdf) | |
| GPS | NetCDF, ASCII, Original files | Jennifer Hutchings, UAF | About Camp GPS Data (pdf) | |
| Thermistor | Images, NetCDF | Harper Simmons, UAF | ||
| Calibration Transects | drill hole data | original,netcdf,ascii | Steffan Hendriks, Torge Martin, AWI Bruce Elder,Jackie Richter-Menge, CRREL Cathy Geiger, U. Delaware | about |
| em-31 data | NetCDF, Originals | Jackie Richter-Menge, CRREL | ||
| Coincident Airborne-Ground EM | NetCDF, Originals | Cathy Geiger, U. Delaware | readme | |
| GPR | Images, Originals | Cathy Geiger, U. Delaware | Poster, post processing information | |
| snow data | Snow bulk density (csv) Snow pit soot survey (xls) |
Cathy Geiger, U. Delaware | 2007 AGU Snow Poster | |
| Ridge Study | Blocks | ASCII, NetCDF, Originals | Alice Orlich, UAF | photo analysis and in-situ About |
| Dives | ASCII, NetCDF, Originals | Alice Orlich, UAF | About | Ice Draft and Freeboard | NetCDF, Originals | Martin Doble, Obs-VLFR | About |
| Ridge Study Holes | NetCDF, ASCII, Original files | Jennifer Hutchings, UAF | About Camp GPS Data (pdf) | NWRA lead study | Ice Tracking Buoy | Originals, ASCII, netcdf, images | Matt Pruis, NWRA | About |
| Floe Perimeter | EM | original, netcdf | Andrew Roberts, UAF | on foot readme.txt |
| Photo | PerimeterTransects | Andrew Roberts, UAF | on foot The SEDNA perimeter survey |
|
| Blocks | netcdf, ascii, original | Alice Orlich, UAF | on foot Ridge and Perimeter |
|
| Ice Thickness | HEM | Stefan Hendriks, AWI | About (pdf) | |
| Lidar | FRS, PDF, PS | Rene Forsberg, National Space Institute, DTU Space | About | |
| Submarine | Originals, netcdf, images | Peter Wadhams, U. Cambridge | About Submarine data | |
| Satellite | Radar Sat Derived | VIMS | Chandra Kambhatmettu, Cathy Geiger, U. Delware | original source about |
| Radar Sat Derived ArcGIS | arcgis | Rudiger Gens, Alaska Satellite Facility, Geophysical Institute, UAF | about arcgis | |
| ICESat | Monthly derived; series of tracks | Ronald Kwok; Ben Holt, Jet Propulsion Laboratory Jay Zwally NASA Goddard Space Flight Center | About About ICESat data ICESat metadata ICESat GRL link | |
| EnviSat | Zip file and Originals (tif/aux) | Nick Hughes, Norwegian Meteorological Institute | About EnviSat data | |
| MODIS | GeoTIFF, Quicklook & Raw TAR Files | National Ice Center | About MODIS data | |
| SSMI | tif image files | National Ice Center | DMSP Satellite | |
| QuickScat | Zip files | National Ice Center | ||
| Ice Analysis | OLS | Zip files | National Ice Center | NGDC NSIDC |
| Ice Analysis | Jpeg images | National Ice Center | NIC Egg Code | |
| PIP Drifts | Shape files | National Ice Center |
About SEDNA
The mass balance of sea ice and evolution of the sea ice thickness distribution is a key component of the Arctic system. It is controlled by thermodynamic ice growth and melt, mechanical redistribution through ridging and rafting, and transport. The SEDNA experiment was designed in a regional Lagrangian frame of reference, and tracked the evolution of a region of ice surrounding the APLIS 2007 ice camp, such that we can isolate the role of mechanical redistribution on the ice thickness distribution.
Data Organization
The backbone of the experiment was an array of buoys deployed in 3 rings around the ice camp. The inner buoy array included 6 GPS ice drifters deployed 10km from the camp, with 3 CRREL stress gauges in the ring. The outer buoy array was 6 GPS ice drifters deployed 70km from the camp. In the SEDNA data portal, data is organized according to the scale over which it was collected. Some data was recorded at particular points, and a set of calibration transects were performed over 1km scales. The 10km and 100km scales were defined by the inner and outer buoy arrays. Regional scale is the entire Beaufort Sea, including the 100nm buoy array, and long-range transects. Please note particular data sets fit into multiple scales. For example, before the SEDNA experiment we did not know what scales stress gauges monitor dynamic ice stress over. Also, satellite, reanalysis and model data sets can be analyzed to resolve a range of scales.
