The grey shaded areas show the maximum range of variability of sea ice extent for the first decade of the satellite era (1979-88) and the recent decade (2008-17), illustrating the long-term change in sea ice extent over the entire period since 1979. The data files are in comma delimited ASCII text format (.csv).These files contain the daily average extent data for 1981 to 2010. The Sea Ice Index archive contains the following: Monthly images of extent, concentration, anomalies, and trends from November 1978 through last month. From the Shapefiles are available for Northern and Southern hemispheres, polylines only.Compare satellite images of September sea ice minimum extents for the last thirty years for both the Arctic and the Antarctic.View Arctic and Antarctic sea ice extents from 1979 through present for the months March (maximum sea ice extents) and September (minimum sea ice extents). Sea Ice Index from the National Snow and Ice Data Center; Sea Ice Archive from the Nansen Environmental and Remote Sensing Center (Johannessen et al., 1999, Science). Sea ice area is now significantly below the level of the 1980s and earlier. quite well during the winter months.Sea ice extent trend for the Northern Hemisphere.

ice and the dark shades of grey are older multi-year ice. The recent years represent a unique event because they show a year-to-year persistence of minimum ice extents (graph below). As is the rule with operational centers, gaps in production can occur without warning. I am of the opinion that the sea ice extent and extent gain in January 2020 can be regarded as an event - Extent gain on this day 48 k, 12 k more than the average gain (of the last 10 years) of 36 k, - Extent gain in this freezing season to date is 9,771 k, 721 k (8.0%) MORE than the average last 10 years gain to date of 9,050 k. GeoTIFF and shapfile sea ice coverage by region. The maps below show the areas for September (shaded) relative to the median extent (purple line). motion of large ice floes and the formation leads can be seen The database is continuously updated and developed. And in case you’re having a hard time reading the numbers, Felix breaks them down for you: Sea ice extent in June 2020 = 13.2 million sq km Sea ice extent in June 1980 = 12.5 million sq km Robert Felix over at iceagenow.com dives into the data, adding that sea ice extent today stands at 700,000 sq km (270,272 sq miles) greater than in 1980. Daily images of extent and concentration. with the date shown in the lower part of each image. The data files are in comma delimited ASCII text format (.csv).These data are not part of the Sea Ice Index archive.

The data from years 2002-2018 are also available at the data publisher PANGAEA, one data set each for Arctic and Antarctic, AMS-E-based and AMSR2-based: Melsheimer, Christian, Spreen, Gunnar (2020): AMSR-E ASI sea ice concentration data, Arctic, version 5.4 (NetCDF) (June 2002 - September 2011). According to official government data from the National Snow & Ice Data Center (NSIDC), 2020’s Antarctic Sea Ice Extent is tracking the 1979-1990 average. as blue. Climate alarmists take note, the ice locked within Antarctica is far more important to your hokey climate theories than that contained in its northern cousin the Arctic.. Here you can access the archived monthly and daily Sea Ice Index images and data as well as the input data from which the Sea Ice Index is derived.All archived data reside in the following FTP location: Monthly concentration, extent, anomaly, and trend images are availabe from the archive.Daily concentration and extent are available from the archive.Monthly extent shapefiles are available for Northern and Southern hemispheres, for November 1978 to present, both as polygons and polylines.Each month's or day's shapefile indicates that month's or day's median extent for the period 1981 to 2010. To access these data and learn more about them, see the following links: Sea ice extent estimates are based on products from by the National Snow and Ice Data Center (NSIDC) Sea Ice Index (Fetterer et al., 2012) from NASA gridded sea ice concentration fields (Cavalieri et al., 1996; Maslanik and Stroeve, 1999; Meier et al., 2012). Note: September is the default month when the file is opened. MASIE uses the most recent full day of data from NIC, obtained nightly. The sea ice area for the Arctic shows near-record minimums since 2002. Data are from the NSIDC Sea Ice Index, Version 3 … Monthly GIS compatible shapefiles of ice extent. In general lighter shades of grey are newly formed first year

To see March, click on the March layer in the Google Earth side panel.The ASCII data files tabulate extent and area (in millions of square kilometers) by year for a given month.These files provide the total extent for each day for the entire time period for both hemispheres. Northern Hemisphere-wide sea ice coverage since 01 Jan. 2006. They comprise the data for the solid grey line and the light grey standard deviation swath in the Daily Total Sea Ice Extent Time Series Graph. (Image credit: National Snow and Ice Data Center) The core of year-round sea ice that extends from the central Arctic to the north coast of Canada has taken a well-publicized beating lately. CSV file of sea ice extent for the entire Northern Hemisphere and by region. The five-day running average of Arctic sea ice extent ending on July 15, 2020, was at a record low for the date in satellite-based data extending back to 1979.


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