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MMAB Sea Ice Analysis Page

Starting 19 June 2012, sea ice concentration analysis is done using the SSMI on DMSP F-15, and SSMI-S on DMSP F-17.

Starting 11 October 2011, sea ice concentration alaysis was done using SSMI on DMSP F-15.

From May 2009 to 4 October 2011, when data stopped, sea ice concentration analysis was done with AMSR-E data and the NASA TEAM2 algorithm. The high resolution grid is unchanged, still 12.7 km resolution. SSMI F-13 was used until it ceased providing data entirely late 2009. F-15 was removed from use in February 2009 due to excessive data contamination on one of the sensors used for clearing weather. This did not affect ice concentrations themselves, but lead to erroneously considering areas to be ice, or not ice, in the weather filter.

We are working, albeit slowly, towards a re-analysis of the period in 2009 when particular instruments were becoming unreliable, and new instruments were being added. Other instruments currently available will be added to the analysis as possible.

One noticeable change in the analysis from May, 2009 to October 2011 versus earlier and later periods, is that there is more area of high concentration, and concentrations are higher. Consequently, computations of area from the analysis grids will be biased high compared to earlier times.

Current High Resolution (12.7 km) Ice Analyses

Global
Southern Hemisphere
Northern Hemisphere
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Lower (25.4 km) Resolution Current Ice
Interpreting the Images
How the ice grids are constructed
Details on the regional images
Highly Experimental Projects:

The current sea ice state is important for both modeling efforts, such as the sea ice model and the global weather model, and for sea ice analysts, such as at the Anchorage WFO. Consequently we produce two sorts of field. One is suitable for use by models, the global field. And the other is suitable for use by an analyst. The analyst can apply intelligence and additional data sources to produce a superior final product in his area of responsibility.

For suggestions on the interpretation of these images, please click on the word advice here. For more detail on the source of the images, select the 'about' link below. For much more detail on the data source, quality control, and processing methods, see the Automated Passive Microwave Analysis ... document.

Sea ice history and climatology information, including animations of the ice cover, is at http://polar.ncep.noaa.gov/seaice/Historical.html

The Northern Hemisphere and Southern Hemisphere ice concentration images are live maps. If you select a point on these images, you'll get a magnified image of the region for about 550 km (300 nautical miles) around that point. The orientation of the maps may be different from the full hemisphere image. Please click here for an explanation.

Please e-mail errors or additional analysis sites to Robert.Grumbine@noaa.gov


Most Recent NCEP Automated Ice Concentration Fields

Interpreting the Images
concentration color bargif of the Alaska Region map
Previous Alaska Region Maps
NCEP MMAB Interactive Sea Ice Image Generation
Animation Alaska Region
Sea of Okhotsk and Sea of Japan - current figure
concentration color bargif of the Northern Hemisphere map
Click on a point in the northern hemisphere map to get a magnified view of ice in that vicinity.
Animated Northern Hemisphere
NCEP MMAB Interactive Sea Ice Image Generation

concentration color bar gif of the Southern Hemisphere map
Click on a point in the southern hemisphere map to get a magnified view of ice in that vicinity.

Global ice cover as used for numerical weather, wave, and ocean prediction.
Global map with missing data filled in

Sea Ice Daily Analyses and Images


More about the sea ice group
Links to other polar work
Return to main sea ice page
Return to MMAB products page
Return to Marine Modeling and Analysis Branch main page

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Page last modified: Tuesday, 13-Jan-2015 17:25:53 UTC