2017-01-20T23:20:49Z http://mercury.ornl.gov/oai/provider

oai:mercury-ops2.ornl.gov:ornldaac_1218 2017-01-20T09:44:43Z ORNLDAAC

TAIGA_TUNDRA_TREE_COVER Tree Canopy Cover for the Circumpolar Taiga-Tundra Ecotone: 2000-2005 RANSON, K.J.; MONTESANO, P.M.; NELSON, R.F. Tree Canopy Cover for the Circumpolar Taiga-Tundra Ecotone: 2000-2005 2014 Oak Ridge, Tennessee, U.S.A. Oak Ridge National Laboratory Distributed Active Archive Center Online Files doi:10.3334/ORNLDAAC/1218 1218

ABSTRACT: This data set provides a map of selected areas with defined tree canopy cover over the circumpolar taiga-tundra ecotone (TTE). Canopy cover was derived from the 500-meter MODIS Vegetation Continuous Fields (VCF) product as averaged over six years from 2000-2005 and processed as described in Ranson et al. (2011). This process identified patches of low tree canopy cover which are indicative of the transition from forest to tundra and differentiate the circumpolar taiga–tundra ecotone for the 2000–2005 period. The TTE is the Earth's longest vegetation transition zone and stretches for more than 13,400 km around Arctic North America, Scandinavia, and Eurasia. In Eurasia, the map extends from 60 degrees N to 70 degrees N, and in North America from 50 degrees N to 70 degrees N, excluding Baffin Island in northeastern Canada and the Aleutian Peninsula in southwestern Alaska. Note that for this product, taiga is being used one and the same as boreal forest. This circumpolar TTE area was classified according to VCF tree canopy cover.

2000-01-01 2005-12-31 COMPLETE 50 70 -180 180 ESIP Earth Science Information Partners Program EOSDIS Earth Observing System Data Information System TECHNICAL CONTACT ORNL DAAC User Services ORNL DAAC USER SERVICES OFFICE OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE 37831 USA DIF AUTHOR ORNL DAAC User Services ornldaac@ornl.gov (865) 241-3952 (865) 574-4665

ORNL DAAC User Services Office

P.O. Box 2008, MS 6407

Oak Ridge National Laboratory

Oak Ridge Tennessee 37831-6407 USA 2014-05-08 ORNL_DAAC THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) http://daac.ornl.gov/ 1218 DATA CENTER CONTACT ORNL DAAC USER SERVICES ornldaac@ornl.gov +1(865)241-3952 +1(865)574-4665

ORNL DAAC USER SERVICES OFFICE

P.O. Box 2008, MS 6407

Oak Ridge National Laboratory

Oak Ridge Tennessee 37831-6407 USA EARTH SCIENCE BIOSPHERE VEGETATION CANOPY CHARACTERISTICS EARTH SCIENCE BIOSPHERE VEGETATION VEGETATION COVER MODIS TERRA EARTH SCIENCE MOSAICS MAPPING CANOPY COVER TAIGA TUNDRA GET DATA http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1218 VIEW RELATED INFORMATION https://daac.ornl.gov//VEGETATION/guides/Taiga_Tundra_Ecotone_Tree_Cover.html Tree Canopy Cover for the Circumpolar Taiga-Tundra Ecotone: 2000-2005 USA/NASA ENGLISH GCMD CEOS IDN DIF VERSION 9.0