{"status": "Complete", "organizations": [{"category": "Academic", "logo_name": "9trmurq3zu_agc_logo_144.gif", "name": "Alaska Geobotany Center", "description": null}], "links": [], "collections": [{"hidden": false, "name": "Circumpolar Arctic Vegetation Map", "description": "A geoecological map of the entire Arctic with a unified legend. It is the first vegetation map of an entire global biome at a comparable resolution. "}, {"hidden": false, "name": "All Maps", "description": "Map data"}], "description": "Trend in Arctic biomass was calculated from a linear regression of biomass values for all years 1982-2010 (Epstein et al 2012). Pixels with significant trends (p < 0.05) were retained. Biomass was calculated from the relationship between AVHRR NDVI and ground sampling of biomass, as described below: Aboveground phytomass was sampled on transects along the Arctic bioclimate gradient in North America (1750 km long, 8 locations sampled 2003\u20132006) and Eurasia (1500 km, 5 locations sampled 2007\u20132010). The study locations were chosen to represent each of the five Arctic bioclimate subzones as displayed on the Circumpolar Arctic Vegetation Map (CAVM) \u2013 from Subzone A in the north where shrubs are absent, mosses and lichens are dominant, and bare ground is common, to Subzone E in the south which is characterized by complete ground cover and abundant dwarf shrubs (Circumpolar Arctic Vegetation Map (CAVM) Team 2003). The relationship between landscape-level zonal phytomass sampled along the Arctic transects and satellite NDVI values were compared using logarithmic regression (y = 0.383 Inx + 0.994,R2 = 0.94, p < 0.001).\r\n\r\nBack to [Circumpolar Arctic Vegetation Map](/catalog/entries/5503-circumpolar-arctic-vegetation-map-cavm-team-2003)\r\n\r\n**Map Themes:**\r\n[AVHRR Biomass 2010](/catalog/entries/5495-circumpolar-arctic-biomass-raynolds-et-al-2012), [AVHRR Biomass Trend 1982-2010](/catalog/entries/5496-circumpolar-arctic-biomass-trend-1982-2010-eps), [AVHRR False Color-Infrared 1993-1995](/catalog/entries/5520-circumpolar-arctic-avhrr-false-color-infrared), [AVHRR NDVI 1993-1995](/catalog/entries/5512-arctic-alaska-avhrr-ndvi-map), [AVHRR NDVI Trend 1982-2010](/catalog/entries/5424-circumpolar-arctic-avhrr-ndvi-trend-1982-2008), [AVHRR Summer Warmth Index 1982-2003](/catalog/entries/5497-circumpolar-arctic-avhrr-summer-warmth-index-19), [Bioclimate Subzone](/catalog/entries/5517-circumpolar-arctic-bioclimate-subzones), [Coastline and Treeline](/catalog/entries/5421-circumpolar-arctic-coastline-and-treeline-map), [Elevation](/catalog/entries/5518-circumpolar-arctic-elevation-map), [Floristic Provinces](/catalog/entries/5493-circumpolar-arctic-floristic-provinces-map), [Lake Cover](/catalog/entries/5420-circumpolar-arctic-lake-cover-map), [Landscape](/catalog/entries/5508-circumpolar-arctic-landscape-map), [Landscape Age](/catalog/entries/5519-circumpolar-landscape-age-map-raynolds-et-al), \r\n[Substrate pH](/catalog/entries/5423-circumpolar-arctic-substrate-ph), [Vegetation Layer](/catalog/entries/5422-circumpolar-arctic-vegetation-map-vegetation-l) \r\n\r\n**References**\r\n\r\nEpstein, H. E., M. K. Raynolds, D. A. Walker, U. S. Bhatt, C. J. Tucker, and J. E. Pinzon. 2012. Dynamics of aboveground phytomass of the circumpolar arctic tundra during the past three decades. Environmental Research Letters 7:015506 (015512 pp).", "end_date": null, "title": "Circumpolar Arctic Biomass Trend 1982-2010 (Epstein et al. 2012)", "other_contacts": [{"phone": null, "name": "Howard Epstein", "email": "hee2b@virginia.edu"}, {"phone": "", "name": "Alaska Geobotany Center (AGC)", "email": "uaf-agc@alaska.edu"}], "iso_topics": ["002", "008", "010"], "tags": ["biomass", "CAVM", "trends", "circumpolar north"], "bounds": [], "start_date": null, "regions": ["Arctic"], "other_agencies": "", "data_types": [{"name": "GIS", "description": null}, {"name": "Image", "description": null}, {"name": "Map", "description": null}], "archived_at": null, "primary_contacts": [{"phone": "", "name": "Martha Raynolds", "email": "mkraynolds@alaska.edu"}], "type": {"color": "#3a87ad", "name": "Data", "description": "catalog record for projects with associated data/observation files"}, "slug": "circumpolar-arctic-biomass-trend-1982-2010-epstein-et-al-2012", "attachments": [{"category": "Public Download", "file_name": "aga_circumpolar_avhrr_biomass_trend_1982-2010_tif.zip", "description": "GIS Data", "file_size": 60608}, {"category": "Primary Thumbnail", "file_name": "aga_circumpolar_avhrr_biomass_trend_1982_2010.png", "description": "Map Preview", "file_size": 216666}, {"category": "Public Download", "file_name": "Epstein_et_al_2012_ERL_biomass_trend.pdf", "description": "Publication", "file_size": 756714}, {"category": "Public Download", "file_name": "aga_circumpolar_avhrr_biomass_trend_1982-2010.png", "description": "Map Image", "file_size": 216666}]}