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| 2009 | 2008 | 2007 | 2006 |
23 April 2009
Both the AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures and AMSR-E/Aqua Daily Global Quarter-Degree Gridded Brightness Temperatures data sets have been updated. This update extends the time series of both data sets to 31 March 2009. The data in this update are still considered Version 3.
06 October 2008
NSIDC has released a new data set: Near-Real-Time DMSP SSM/I Pathfinder Daily EASE-Grid Brightness Temperatures. This data set provides daily, near-real-time Special Sensor Microwave/Imager (SSM/I) brightness temperatures in the 25 km Equal-Area Scalable Earth-Grid (EASE-Grid). For more information, please see the data set documentation or contact NSIDC User Services.
05 August 2008
Due to an error in an ancillary data file, the following Version 2 AMSR-E Level 3 snow products were removed from NSIDC's archives:
The bad ancillary data file creates an incorrect Snow Water Equivalent (SWE) flag. Any AMSR-E Level 3 snowfall data using the Transitional 08 Algorithm (T08) received from NSIDC prior to 23 July 2008 should not be used. The filename has the variable T08 in it.
Beginning 28 July 2008, new Version 2 AMSR-E Level 3 snow products were generated for 21 July 2008 and will continue with forward processing. Reprocessing will beginning with 19 June 2002, the start of the AMSR-E mission, and continue through 20 July 2008. The algorithm will remain at the T08 level.
For more information, contact NSIDC User Services.
04 August 2008
As of 06 July 2008, Version 2 of AMSR-E Level 3 land, rain, ocean, snow, and sea ice products are now available at NSIDC, and are considered Transitional (T) or Validated (V). The following is a listing of the Level 3 products.
Land Product (Algorithm: T05)
Rain Product (Algorithm: V06 - Stage 2)
Ocean Products (Algorithm: V03 - Stage 2)
Sea Ice Products (Algorithm: T07)
Snow Products (Algorithm: T08)
Delivered Algorithm Packages (DAPs) are also available for these products. If you are interested in receiving the DAP, or for more information, contact NSIDC User Services.
22 February 2008
NSIDC has released the Global EASE-Grid 8-day Blended SSM/I and MODIS Snow Cover data set suitable for continental- to hemispheric-scale seasonal fluctuations of snow covered area (SCA) and snow water equivalent (SWE). This data set comprises global, 8-day SWE data from 2000 through 2007, enhanced with snow-covered area derived from MODIS visible wavelength bands.
The new data set blends visible and microwave data at higher temporal resolution (8-day) than NSIDC has offered before; and it is our first snow cover product to be released in netCDF format, specifically at the request of modelers.
Produced in the 25-kilometer Equal-Area Scaleable Earth Grid (EASE-Grid), the new product is unique in blending information from both passive microwave and visible sensors on a global scale for the period when both types of sensor data are available.
16 January 2008
The AVHRR Polar Pathfinder Twice-Daily 5 km EASE-grid Composites data set has been updated. This update extends the time series to 30 June 2005. The data in this update is still considered Version 3. This update includes:
20 September 2007
The complete times series of Version 2 data for the Near-Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent product is now available from the Data Pool and will remain available indefinitely. The time series extends from 04 May 1995 through present.
8 December 2006
AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures: NSIDC produces AMSR-E gridded brightness temperature data by interpolating AMSR-E data to the output grids from swath space using an inverse-distance squared method. Data for the Northern Hemisphere and Southern Hemisphere EASE-Grid projections, at 25 km resolution, are now available. Data begin 19 June 2002, and processing is ongoing.
7 February 2006
Arctic EASE-Grid Freeze and Thaw Depths, 1901 - 2002: This FGDC data set contains mean, median, minimum and maximum freeze and thaw depths for each year from 1901 to 2002 on the 25 km EASE-Grid for areas north of 50°. Freeze and thaw depths are estimated using a variant of the Stefan solution that uses an edaphic factor and freezing or thawing indices as inputs.
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