News
| 2011 | 2010 | 2009 | 2008 |
2011 Data News
23 June 2011
NSIDC is pleased to announce that the DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures data set has been updated. This quarterly update extends the time series of the data set through 31 March 2011. Both the data and associated documentation are available via the product catalog page. For assistance, please contact NSIDC User Services.
18 February 2011
Brightness Temperatures from the F17 satellite are now available for the DMSP SSM/I-SSMIS Polar Gridded Brightness Temperatures data set, and span the period 14 December 2006 through 19 August 2010. This recently updated data set, now at Version 4, includes brightness temperatures obtained by the Special Sensor Microwave Imager/Sounder (SSMIS) on the Defense Meteorological Satellite Program F17 (DMSP-F17) satellite.
With SSMIS, a new 91.7 GHz high-resolution channel replaces the 85.5 GHz channel of the former SSM/I instrument. NSIDC has analyzed the intercalibrated SSM/I and SSMIS data for a complete intercomparison of the F13 and F17 brightness temperatures. For more details and data access, refer to the product summary Web page.
If you have any questions, please contact NSIDC User Services.
2010 Data News
24 September 2010
Interactive Data Language (IDL) expert, David Fanning, has created a new tool for NSIDC, called the NSIDC DataViewer, that allows data users to conveniently view, display, and manipulate satellite images in a user-defined grid. The tool can be used with a variety of NSIDC passive microwave data sets ranging from brightness temperatures to sea ice motion vectors, and in three different projections, including Polar Stereographic, EASE-Grid, and Quarter-Degree.
Up to 64 images can be displayed simultaneously in the DataViewer resizeable graphics window, allowing data users to page through a series of images. Images can then be scaled and manipulated either individually or as a group. By moving the cursor over an image, a data user can obtain the latitude and longitude coordinates as well as the image value at the cursor location. After an image or series of images is manipulated, the contents of the graphics window(s) can be saved in a variety of image formats, including PostScript, PNG, JPEG, and TIFF.
The NSIDC DataViewer can be run in IDL with an IDL license, via the freely distributed IDL Virtual Machine, or as a run-time application. The NSIDC DataViewer is available via FTP in both Windows- and UNIX-compatible versions: dataviewer.zip and dataviewer.tar.gz, respectively.
2009 Data News
14 April 2009
Data are now available through June 2008 for the DMSP SSM/I Daily and Monthly Polar Gridded Sea Ice Concentrations data set. The Special Sensor Microwave Imager (SSM/I) derived ice concentrations are daily total and monthly-averaged ice fractions for both hemispheres with a temporal coverage record now spanning from June 1987 to June 2008.
18 February 2009
On 16 February 2009, NSIDC noticed significant problems with the Near-Real-Time (NRT) sea ice product. Upon investigation, the problem was found to be due to an issue with the DMSP F15 SSM/I 22 GHz frequency brightness temperature fields used as inputs into the sea ice algorithm. The problem began around 1 January 2009 and gradually worsened until it became noticeable in the sea ice product. NSIDC is working to correct the issue and provide reliable NRT sea ice data. In the meantime, F15 data since 1 January 2009 should not be used. The data sets affected by this problem are the following: The Sea Ice Index, Near-Real-Time DMSP SSM/I Daily Polar Gridded Brightness Temperatures, and Near-Real-Time DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations.
2008 Data News
13 November 2008
NSIDC has recently updated the Northern Hemisphere TOVS Pathfinder Path-P Daily and Monthly Polar Gridded Atmospheric Parameters data set. The data now span July 1979 to December 2005. Additional changes to the Northern and Southern TOVS data include a new file naming convention and a new FTP directory structure. Data set documentation and FTP access are available from the data set Web page. If you have any questions, please contact NSIDC User Services.
14 October 2008
NSIDC is pleased to announce that the DMSP SSM/I Daily Polar Gridded Brightness Temperatures data set has been updated through June 2008. Data set documentation and FTP data access are available from the data set documentation. If you have any questions, please contact NSIDC User Services.
29 September 2008
NSIDC is pleased to announce a recent update to the Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I data set. The daily and monthly data have been updated and now span 26 October 1978 through 31 December 2007 for the northern and southern hemispheres.
For additional information on this data set or to access the data, please see the data set documentation.
20 June 2008
NSIDC has recently updated the Sea Ice Trends and Climatologies from SMMR and SSM/I data products. These value-added products are now only derived from the Goddard Space Flight Center (GSFC) sea ice data sets: the NASA Team Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave data set and the Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I data set. The NASA Team sea ice data now span 1979 – 2007, and the Bootstrap sea ice data now span 1979 – 2006.
For additional information on the sea ice trends and climatologies, please see the Sea Ice Trends and Climatologies from SMMR and SSM/I product Web site.
If you have any questions, please contact NSIDC User Services.
09 June 2008
Data are now available through December 2007 for the Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave data set.
