Data Updates & Announcements

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2007

29 December 2007

Erroneous MODIS Version 005 Snow Cover Data

The MODIS/Terra and MODIS/Aqua Snow Cover Daily L3 Global 0.05Deg CMG data products (MOD10C1.v005 and MYD10C1.v005) and the Snow Cover 8-Day L3 Global 0.05Deg CMG data products (MOD10C2.v005 and MYD10C2.v005) were processed with corrupted tile indices as a result of incorrect static input files. Static input files determine and map each tile pixel to the corresponding 0.05-degree pixel in the CMG lat-lon grid.

Reprocessing of the erroneous data for 2003 and 2004 is complete. NSIDC expects to receive 2007 reprocessed data by 07 December 2007. For more detailed information about the errors, please visit the MODIS Land Science Data Discipline Team Web site.

Affected Dates for Terra Product
Year Julian Day Through Year Julian Day
2003
065
through 2003
137
2004
192
through 2004
263
2007
001
through 2007
307


Affected Dates for Aqua Product
Year Julian Day Through Year Julian Day
2003
065
through 2003
137
2004
192
through 2007
260
2007
001
through 2007
307

17 December 2007

World Glacier Inventory: More than 34,000 glaciers in China have been added to the World Glacier Inventory. For more information, please see the Quality Assessment and History of Updates section of the data set documentation. To access the new data from this update, proceed to the World Glacier Inventory search page and select "CAREERI, Lanzhou, China. Che/Wu" from the Data Contributor pull-down menu.

11 December 2007

Loss of AMSR-E Aqua GBAD Data

On 2 December 2007, an anomaly developed on the Aqua spacecraft which prevented the production of Ground Based Attitude Determination (GBAD) data. Due to the loss of GBAD data, AMSR-E data production was stopped. Data production resumed on 7 December 2007; however, products are slightly delayed. Production is expected to return to normal by 12 December. All data for 2 December through 6 December is expected to be recovered and will be available from NSIDC.

27 November 2007

NSIDC is exhibiting at the 2007 American Geophysical Union (AGU) Fall Meeting in San Francisco from December 11 - 14. Please stop by and visit NSIDC staff at Booth No. 139.

12 November 2007

NOAA@NSIDC has published Sea Ice Charts of the Russian Arctic in Gridded Format, 1933-2006. These data, from the Arctic and Antarctic Research Institute in St. Petersburg, Russia, are an important new data source for those studying the role of sea ice in climate change.

30 October 2007

NSIDC Metadata Now Accessible: Collection-level metadata are now available on NSIDC's Web site for all data products. You can view this metadata in three different ways: from the catalog page, from a utility, or from an FTP site. The catalog page for each data set now includes a View Metadata Record link below the data set summary, which accesses a dynamically-generated Web page with metadata that conform to the Global Change Master Directory (GCMD) Directory Interchange Format (DIF) standard (see example). Additional metadata output options on this Web page include DIF in plain text, DIF in Extensible Markup Language (XML), and U.S. Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM) in Hypertext Markup Language (HTML), plain text, and XML. Also, included on this Web page is an interactive Google Map that displays the spatial coverage for the data set.

The second way to view metadata is by using the same utility that created the dynamically-generated Web page to construct your own Web page with your own format and style. For more information on how to do this, please see the get_metadata.pl Web page. In addition, metadata for all of our holdings are also available in XML files for both DIF and FGDC standards at the following FTP site: ftp://sidads.colorado.edu/pub/incoming/metadata/. Updated on a daily basis, these FTP folders are provided to allow other organizations to regularly harvest our metadata collection for inclusion in data discovery and access portals.

18 October 2007

ICESat/GLAS: Release-28 data for the Laser 3C time period (20 May 2005 to 23 June 2005) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3C data*, and it is another release of GLAS data with the satellite's attitude in "airplane" mode. Please contact User Services for a more complete description. *Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information.

27 September 2007

Today's update to the Glacier Photograph Collection includes 50 photographs taken between 1890 and 1996. Represented in this batch are Colorado glacier photographs taken by Junius Henderson, Oscar A. Randolph, Rudolph Johnson, and Russell Allen. The glaciers are Andrews, Arapaho, Fair, Isabel, Mills, Saint Vrain and Taylor. Other photos include a series of Franz Josef Glacier (1951-1964), and Harry Fielding Reid images of John Muir's cabin taken in 1890.

25 September 2007

ICESat/GLAS: Release-28 data for the Laser 3F time period (24 May 2006 to 26 June 2006) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3F data*, and it is also the first release of GLAS data with the satellite's attitude in "airplane" mode. Depending on the time of year, the satellite's attitude is changed from airplane to sailboat to accommodate sun angle changes and for power and thermal stability. *Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products.

20 September 2007

The complete times series of Version 4 data for the MODIS/Terra Snow Cover 8-day L3 Global 500m Grid (MOD10A2) product and the MODIS/Terra Snow Cover 8-day L3 Global 0.05Deg CMG (MOD10C2) product are now available from the Data Pool and will remain available indefinitely. The time series extends from Feb 2000 through Dec 2006.

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.

04 September 2007

ICESat/GLAS: Release-28 data for the Laser 3H time period (12 March 2007 to 14 April 2007) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3H data. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products.

September 2007

NOAA@NSIDC is pleased to announce updates to the Glacier Photograph Collection. More than 1,200 photographs of Greenland glaciers have been digitized from slides and are available online for viewing and downloading. The Greenland photograph collection was donated to the World Data Center for Glaciology, Boulder in the mid 1980s by Captain Ron Kollmeyer of the U.S. Coast Guard. Captain Kollmeyer was the lead for the Greenland Glacier Survey. The photographs of western Greenland glaciers were taken between 1969 and 1980, from ground observation stations and from U.S. Coast Guard helicopters at an altitude between 100 and 1,000 feet. To access the new data from this update, proceed to http://nsidc.org/data/glacier_photo/photo_query.html and select "Country" from the available search options. On the next screen choose "Greenland (DK)" from the Country pull-down menu.

07 August 2007

AMSR/ADEOS-II L1A Raw Observation Counts (AMSR-L1A), Version 2: This data set is now available from NSIDC. The data are available for 28 January until 24 October 2003, when the satellite was lost, and are restricted to NASA approved users. For information on becoming a NASA approved user, please go to the Order Data Web page, and refer to the information under the column heading: First Time Users of AMSR/ADEOS-II Data.

August 2007

The World Glacier Inventory has recently been updated. Over 1,600 glaciers from the former Soviet Union were added and errors with 368 glacier IDs were identified and corrected. For more information, please see the "Quality Assessment and History of Updates" section in the data set "Documentation" for further details about these updates. To access the new data from this update, proceed to the World Glacier Inventory search page, and select "Institute of Geography, Russian Academy of Science. Chernova" from the Data Contributor pull-down menu.

26 July 2007

Trapped Gas Composition and Chronology of the Vostok Ice Core: This AGDC data set includes a time scale for the Vostok ice core, retrieved from Vostok Station on the East Antarctic Plateau. Investigators analyzed the molecular oxygen to nitrogen (O2/N2) ratios and the delta oxygen-18 (δ18O) record for approximately the past 115,000 to 400,000 years in the Vostok ice core.

10 July 2007

Carbon-13 Isotopic Composition of Atmospheric Methane in Firn Air, Siple Dome, Antarctica: This AGDC data set includes records of the delta carbon-13 (d13C) of methane (CH4) in firn air from the South Pole and trapped in bubbles in a short ice core from Siple Dome, Antarctica. Using two firn air samples, investigators reconstructed records of the isotopic composition of paleoatmospheric methane covering the last 2 centuries, from 1820 to 2001.

10 July 2007

Radar Investigations of Antarctic Ice Stream Margins, Siple Dome, 1998: This AGDC data set consists of surface-based radar measurements, including geometry of the bed, surface, and internal layers, and bed reflectivity measurements at two sites along ice stream margins at Siple Dome, Antarctica.

30 June 2007

March through August Ice Edge Positions in the Nordic Seas, 1750-2002: This new NOAA data set contains ice edge positions from ship logbooks, diaries, and other sources, in addition to more recent satellite data products. Data are available as ASCII text, browse images, and as shapefiles (GIS format). This long record sheds light on ice edge variability through regional shifts in climate.

21 June 2007

GLAS/ICESat Laser Altimetry Digital Elevation Models (DEMs) of Antarctica and Greenland: These two new digital elevation models (DEMs) of Antarctica and Greenland were derived from GLAS/ICESat laser altimetry profile data and provide new surface elevation grids of the ice sheets and coastal areas, with greater latitudinal extent and fewer slope-related effects than radar altimetry. These DEM data sets were generated from the first seven operational periods (from February 2003 through June 2005) of the GLAS instrument. They are provided on polar stereographic grids at 500 m grid spacing for Antarctica and 1 km grid spacing for Greenland.

8 June 2007

Cosmogenic Radionuclides in the Siple Dome A Ice Core: This AGDC data set includes a record of cosmogenic radionuclide concentrations in the Siple Dome A ice core collected as part of the West Antarctic ice core program. The investigators measured profiles of both 10Be and 36Cl in the entire ice core, which spans the time period from the present to about 100,000 years before present.

22 May 2007

Paleoenvironment, Geomorphic Processes, and Carbon Stocks of Drained Thaw-lake Basins in the Arctic Coastal Plain, Alaska, USA, 2002-2005: This ARCSS data set is from a study of the origin and associated geomorphological, ecological, and pedological processes of thaw-lake basins of the Arctic Coastal Plain, Alaska. Investigators used radiometric dating, microfossil analysis, and soil development to determine whether carbon accumulation rates respond to regional changes in climate, or if they are influenced by local rates of plant succession.

18 May 2007

High-Resolution Rectified Aerial Photography for Collaborative Research of Environmental Change at Barrow, Alaska, USA: This ARCSS data set includes aerial photography of Barrow, Alaska, which has been geocorrected to a 2002 QuickBird satellite image or Interferometric Synthetic Aperture Radar (IFSAR) imagery. Photography included in the set is from eight specific dates, which span from 1948 to 1997: 4 August 1948, 29 July 1949, 12-14 August 1955, 12-24 August 1962, 14 July 1964, 15 July 1979, 31 August 1984, and 16 July 1997.

9 May 2007

ICESat/GLAS: Release-28 data for the Laser 1 time period (20 February 2003 to 21 March 2003) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products.

7 May 2007

NSIDC Atlas of the Cryosphere: The NSIDC Atlas of the Cryosphere is a dynamic mapping Web site that allows the visitor to explore the Earth's frozen regions. Viewed from a polar perspective, the available scenes includes snow cover, sea ice extent and concentration, glaciers, permafrost, and other critical components of the Earth's cryosphere. The user can zoom in to a specific region on the Earth as well as overlay country borders, major cities, and other geographic information.

24 April 2007

ICESat/GLAS: Release-28 data for the Laser 3G time period (25 October 2006 to 27 November 2006) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products.

22 April 2007

Good Days on the Trail, 1938-1942 was shown as part of the University of Colorado International Film Series. The film, with color footage of CU students on alpine hikes, provides a glimpse into the mountaineering lifestyle of an earlier time, along with shots of Arapaho Glacier and other Front Range glaciers. Scientists from NSIDC and the CU Institute of Arctic and Alpine Research narrated. The film is being preserved and digitized with support from the NOAA National Geophysical Data Center and the Climate Database Modernization Program.

30 March 2007

ICESat/GLAS: Release-28 data for the Laser 2A time period (25 September 2003 to 18 November 2003) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products.

19 March 2007

Vertical Strain at Siple Dome, Antarctica, 1999-2002: This AGDC data set consists of a table of long-term average strain rates measured between 1999 and 2002 at Siple Dome, Antarctica as a part of the West Antarctic Ice Sheet Cores (WAISCORES) project for deep ice coring in West Antarctica.

19 March 2007

Model Output Assessing Net Carbon Exchange Across the Arctic Tundra-Boreal Forest Transition in Alaska, 1981-2000: This ARCSS data set includes simulated temporal and spatial patterns of net carbon exchange in Alaskan ecosystems that span the transition from Arctic tundra to boreal forest. Investigators modeled net carbon storage along with vegetation and soil carbon and nitrogen pools in tundra, shrub tundra, and tree line evergreen conifer forest ecosystems using the Terrestrial Ecosystem Model (TEM) 5.0.

16 February 2007

Oxygen and Deuterium Isotope Measurements from Siberia, 2002-2004: This ARCSS data set contains measurements from a stable isotope analysis of rain, snow, the Kolyma River, and a local stream near Cherskii, Siberia. As part of the Russian-American Initiative on Shelf-land Environments (RAISE) program, this research was designed to quantify the impacts of disturbance on the seasonal cycle of atmospheric carbon dioxide and the discharge of carbon and nitrogen into the Arctic Ocean in forest and shrubby tundra regions.

26 January 2007

Mooring and Drifting Buoy Data: Beaufort Gyre Freshwater Experiment, 2003: This brokered product, supported by the ADCC, contains temperature time series, salinity, current, sea ice draft, and bottom pressure measurements. Investigators established an observational program to measure the freshwater content (in sea ice and in the ocean) of freshwater fluxes in the Beaufort Gyre using moorings and drifting buoys during the summer of 2003.

17 January 2007

ICESat/GLAS: Release-28 data for the Laser 3A time period (03 October 2004 to 08 November 2004) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3A data for some altimetry products. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products.

16 January 2007

MODIS/Terra: The complete time series of MODIS/Terra Snow Cover Daily L3 Global 0.05Deg CMG V004 (MOD10C1 V004) data is now available through the online Data Pool and will remain there indefinitely.

16 January 2007

MODIS/Aqua Version 5 Snow and Sea Ice Products: NSIDC is pleased to announce the release of Version 5 (V005) reprocessed MODIS/Aqua snow products, which contain several improvements over the previous versions. For example, monthly snow products are available in a Climate Modeling Grid (CMG) format, fractional snow cover was added to MYD10_L2 and MYD10A1 products, browse images are available for all products, Sea Ice by Ice Surface Temperature (IST) and combined sea ice fields were removed, and all products use HDF compression making the file size much smaller.