SNOWDATA GeoTIFF Annual Snow Free Date (year)
type: Dataset
description: This dataset includes Snow Free Date(sfdy) for northern Alaska in GeoTiff format, covering the years 1980-2012. Snow Free Date is defined as day of the end of the core snow period(day of year). The core snow season is defined to be the longest period of continuous snow cover in each year. The dataset was generated by the Arctic LCC SNOWDATA: Snow Datasets for Arctic Terrestrial Applications project. "Day-of-year" (doy) output is expressed in Ordinal dates ("1" on 1 January, and "365" on 31 December). Dates have not been corrected for leap years. This output is appropriate for display purposes, as it is readily interpreted as calendar day of year. It is not recommended as input for analysis, as it may produce incorrect statistics; "day-of-simulation" (dos) files should be used for that purpose. "Day-of-year" (doy) is converted from "day-of-simulation" (dos) by the following sequence of process steps: if (dos <= 122) then doy = dos + 243 else doy = dos – 122 endif The dataset is delivered in the ZIP archive file format. Each year is output in a separate GeoTiff file, where the year is indicated by the filename. Over the last 20 years, under a variety of NOAA, NSF, and NASA research programs, a snow-evolution modeling system has been developed that includes the MicroMet micrometeorological model, the SnowModel snow-process model, and the SnowAssim data assimilation model. These modeling tools can be thought of as physically-based mathematical descriptions that create value-added information (e.g., snow depth, snow density, snow hardness, rain-on-snow events, and snow cover duration) from basic meteorological variables (e.g., air temperature, humidity, precipitation, and wind speed and direction). The resulting products are based on a physical understanding of environmental processes and features, and their interactions with the atmosphere and surrounding land surface. SnowModel is unique in its representation of blowing snow processes; it includes SnowTran-3D, a model …
keyword: academics-scientific-researchers
keyword: air-temperature
keyword: albedo
keyword: amerigeo
keyword: amerigeoss
keyword: ckan
keyword: climatologymeteorologyatmosphere
keyword: cryosphere-models
keyword: federal-resource-managers
keyword: geo
keyword: geoss
keyword: glacier-mass-balance-ice-sheet-mass-balance
keyword: glaciers
keyword: models
keyword: national
keyword: north-america
keyword: precipitation
keyword: precipitation-amount
keyword: rain
keyword: snow
keyword: snow-cover
keyword: snow-density
keyword: snow-depth
keyword: snow-energy-balance
keyword: snow-ice
keyword: snow-ice-temperature
keyword: snow-melt
keyword: snow-water-equivalent
keyword: united-states
issued: 2025-11-20T14:00:02.800764
modified: 2019-09-09T00:25:44-08:00
theme: {geospatial}
contact point: Organization
  fn: (Point of Contact, Originator); Arctic Landscape Conservation Cooperative (Point of Contact, Publisher)
spatial: Location

US Migrating
type: Agent

SNOWDATA GeoTIFF Annual Snow Free Date (year)
type: Distribution
description: Direct Download link for SNOWDATA GeoTIFF Annual Snow Free Date (year)
format: ZIP
access URL: http://data.arcticlcc.org/2012-02/SNOWDATA_GeoTIFF_snow_free_date_doy.zip
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Web page for Arctic Landscape Conservation Cooperative
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