Baltic Sea Ice Extent from Observations Reprocessing
type: Dataset
keyword: EARTH SCIENCE>OCEANS>SEA ICE>ICE EXTENT
keyword: target-application#seaiceinformation
keyword: Oceanographic geographical features
keyword: satellite-observation
keyword: sea_ice_extent
keyword: multi-year
keyword: weather-climate-and-seasonal-forecasting
keyword: coastal-marine-environment
keyword: marine-resources
keyword: marine-safety
keyword: baltic-sea
keyword: N/A
keyword: Not Applicable
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qualified relation: Atom format
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  type: Relationship
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qualified relation: JSON-LD (GeoDCAT-AP) metadata
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qualified relation: RDF/XML metadata
  type: Relationship
  relation: https://fedeo.ceos.org/collections/BALTIC_OMI_SI_extent
  format: application/rdf+xml
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qualified relation: Turtle metadata
  type: Relationship
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qualified relation: Landing Page in JSON media type.
  type: Relationship
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description: '''DEFINITION'''Sea ice extent is defined as the area covered by sea ice, that is the area of the ocean having more than 15% sea ice concentration. Sea ice concentration is the fractional coverage of an ocean area covered with sea ice. Daily sea ice extent values are computed from the daily sea ice concentration maps. All sea ice covering the Baltic Sea is included, except for lake ice. The data used to produce the charts are Synthetic Aperture Radar images as well as in situ observations from ice breakers (Uiboupin et al., 2010). The annual course of the sea ice extent has been calculated as daily mean ice extent for each day-of-year over the period October 1992 – September 2014. Weekly smoothed time series of the sea ice extent have been calculated from daily values using a 7-day moving average filter.'''CONTEXT'''Sea ice coverage has a vital role in the annual course of physical and ecological conditions in the Baltic Sea. Moreover, it is an important parameter for safe winter navigation. The presence of sea ice cover sets special requirements for navigation, both for the construction of the ships and their behavior in ice, as in many cases, merchant ships need icebreaker assistance. Temporal trends of the sea ice extent could be a valuable indicator of the climate change signal in the Baltic Sea region. It has been estimated that a 1 °C increase in the average air temperature results in the retreat of ice-covered area in the Baltic Sea about 45,000 km2 (Granskog et al., 2006). Decrease in maximum ice extent may influence vertical stratification of the Baltic Sea (Hordoir and Meier, 2012) and affect the onset of the spring bloom (Eilola et al., 2013). In addition, statistical sea ice coverage information is crucial for planning of coastal and offshore construction. Therefore, the knowledge about ice conditions and their variability is required and monitored in Copernicus Marine Service.'''CMEMS KEY FINDINGS'''Sea ice coverage in the Baltic Sea is strongly seasona…
qualified attribution: Attribution
  agent: Organization
    has name: CMEMS
    has URL: http://marine.copernicus.eu/
temporal: PeriodOfTime
  start date: 1993-01-01T00:00:00.000Z
  end date: 2022-12-31T23:59:59.999Z
license: other