RESEARCH COMPONENTS

SEDNA Data Portal

Sea Ice Experiment Dynamic Nature of the ArcticSea 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.

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 consiste of either complete spreadsheets or the data are in an image format or comprised of large gridded data blocks, an ascii version is not provided.

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)


SEDNA Data Portal

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, Images, ASCII Jennifer Hutchings, UAF Coordinates and derived velocities from various buoys About
IABP NetCDF, ASCII, Original files Ignatius Rigor, UW About
Cooler Buoys ASCII,Original,NetCDF Jennifer Hutchings, UAF about
Camp ADCP NetCDF, ASCII, originals, images Jennifer Hutchings, UAF about
Meteorological Data NetCDF, ascii Andrew Roberts, UAF About Meteorological Data
Synoptic overview (pdf)
CTD 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 about
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 about
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
AUV - Ice Draft and Freeboard NetCDF, Originals Martin Doble, Obs-VLFR About
Ridge Study Holes NetCDF, ASCII, Original files Jennifer Hutchings, UAF About
NWRA lead study Ice Tracking Buoy Originals, ASCII, NetCDF, images Matt Pruis, NWRA About
Floe Perimeter EM original, netcdf Andrew Roberts, UAF readme.txt
Photo PerimeterTransects Andrew Roberts, UAF The SEDNA perimeter survey
Blocks netcdf, ascii, original Alice Orlich, UAF About Perimeter
Ice Thickness HEM Images, NetCDF, ASCII

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,hdf,tar, National Ice Center About MODIS data
SSMI tif image files and gridded netcdf National Ice Center DMSP Satellite
QuickScat GeoTiff files National Ice Center JPL Website
Ice Analysis OLS geotiff files National Ice Center NGDC NSIDC
Ice AnalysisJpeg 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.