Total sea ice extent on the northern hemisphere during the past years, including climate mean; plus/minus 2 standard deviations. 1901-1910 Arctic sea ice data collected by DMI. Validation is best achieved through a comparison with in situ and satellite-derived ice thickness observations.
The state of the sea ice is determined by its extent, thickness and volume The ice cover in the Arctic grows throughout the winter, before peaking in March. Fig 1. Arctic sea ice volume has not fallen in 13 years. According to the Danish Meteorological Institute, Arctic sea ice volume is growing rapidly, normal and the highest in several years. 2019 was the third year since 2007 to record a volume increase under 2000 km3. The state of the sea ice is determined by its extent, thickness and volume The ice cover in the Arctic grows throughout the winter, before peaking in March. There are no true measurements of total ice volume that can be compared to model-derived estimates. GeoTIFF and shapfile sea ice coverage by region. The figures are based on calculations using DMI’s operational ocean and sea ice model HYCOM-CICE. Click to enlarge! It is a two-dimensional measurement; extent does not tell us how thick the ice is. The ice extent values are calculated from the ice type data from the Ocean and Sea Ice, Satellite Application Facility (), where areas with ice concentration higher than 15% are classified as ice. CSV file of sea ice extent for the entire Northern Hemisphere and by region. The problem of validating sea ice volume It is difficult to validate total Arctic sea ice volume directly. Modeled ice thickness and volume The plots show maps with sea ice thickness, and seasonal cycles of the calculated total arctic sea ice volume. Whopping rebound in Arctic sea ice volume. The mean sea ice volume and standard deviation for the period 2004-2013 are shown with gray. The Arctic sea ice is melting, but it has melted and re frozen on a substantially greater scale in the distant past / proxy record. Japanese blogger Kirye, who by now you are all getting to know quite well, plotted the recent Arctic sea ice volume data from the Danish Meteorological Institute (DMI).. Discussions about the amount of sea ice in the Arctic often confuse two very different measures of how much ice there is. DMI Modelled ice thickness The extent of thick ice has doubled over the last ten years. One measure is sea-ice extent which, as the name implies, is a measure of coverage of the ocean where ice covers 15% or more of the surface. As the above chart shows, the ice has in reality even grown a bit! The figures are based on calculations using DMI's operational ocean and sea ice model HYCOM-CICE. The total sea-ice volume is a product of the sea-ice concentration and its thichness. Melting picks up pace during the spring as the sun gets stronger, and in September the extent of the ice cover … Surprise. The Arctic sea ice is melting, but global average temperatures are not significant: Cycles of the AMO and other regional phenomena are more impactful.
Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center: During October there was a slowdown in ice growth, which is also reflected in the PIOMAS numbers. Today, the sea-ice concentration (ice cover) is in general well estimated using satellite products, while the sea-ice thickness is poor known. Data source: Danish Meteorological Institute (DMI).
Even without considering other sources of Arctic thickness and/or volume data it is quite clear from the two volume graphs that according to the Danish Meteorological Institue Arctic sea ice volume is significantly lower this year than it was in 2008. The model gives a realistic estimate of the total amount of sea-ice within the Arctic. Re-calibration of Arctic sea ice extent datasets using Arctic surface air temperature records Ronan Connolly a, Michael Connolly and Willie Soonb aIndependent scientists, Dublin, Ireland; bHarvard-Smithsonian Center for Astrophysic Center for Astrophysics Solar, Stellar and Planetary Sciences Division, Cambridge, MA, USA As is the rule with operational centers, gaps in production can occur without warning. This year the Arctic sea ice volume is showing very impressive growth: As the chart above depicts, Arctic sea ice volume is near a 15-year high, is more than a … MASIE uses the most recent full day of data from NIC, obtained nightly. Northern Hemisphere-wide sea ice coverage since 01 Jan. 2006. Melting picks up pace during the spring as the sun gets stronger, and in September the extent of the ice cover … Sadly, just for a few years we also have March or September available, and thus we normally can’t read the Arctic ice minimum (medio September) from these maps.
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