Type:

Other

Description:

This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over North America from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior days value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a grey cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in landcover.

Subjects:

  • Science > General

Education Levels:

    Keywords:

    SeaWiFS Monthly Land Reflectance,NSDL,Aqua-MODIS Sea Ice Extent and IST Daily L3 Global 4km EASE-Grid Day (MYD29E1D),NSDL_SetSpec_456144,Physical sciences,Graduate/Professional,Space Science,Physics,Snow Cover,Science,Astronomy,Cryology,Undergraduate (Lower Division),Higher Education,Sea Ice Temperature,Undergraduate (Upper Division),SeaStar-SeaWiFS,HDTV,oai:nsdl.org:2200/20061002142129952T,Aqua-MODIS,Terra-MODIS Snow Cover Daily L3 Global 0.05Deg CMG (MOD10C1),Chemistry,Space sciences,Terra-MODIS,Technology,Geoscience,Earth science

    Language:

    English

    Access Privileges:

    Public - Available to anyone

    License Deed:

    Creative Commons Attribution Non-Commercial Share Alike

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