MODICE vs. seaice

The following data compare MODICE (1strike) areas to passive microwave sea ice area and extent by month and region. Each small plot is of residuals (take actual value of parameter for given time period and subtract mean for that time period). Data are grouped in general categories:

  1. 3 "large" areas: All MODICE data we have processed in the N. Hem. (includes all places with ice except for Alps and Caucasus), just the Arctic and just Greenland Mascon
  2. 11 Arctic Mascon areas: using Jacob et al. paper mascon definitions. N.B. "low" MODICE outlier on Iceland plots is 2011 and FrnJLnd is 2008. We should investigate what was happening here.
  3. 7 High Mountain Asia Mascon areas, using Jacob et al. paper mascon definitions (N.B. HMA mascons are not disjoint)

Seaice values are arranged by month in columns. 24 columns are included, the first 12 columns compare the MODICE to the given month in the same year as MODICE, the second 12 columns compare MODICE to the seaice month for the subsequent year.

Seaice regions include "total" and various Arctic subregions, and include both area (area-weighed by sea ice concentration for a given pixel) and extent (all areas with concentration >=15% counted for the area of the pixel) values.

Each comparison plot includes an OLS regression line. Regression lines with slopes different from zero at 95% confidence (p<0.05) are drawn in red.

Click anywhere in the figure to open a new window with just the figure, and use your Cmd+ and Cmd- (or Control+ and Control-) to zoom in and out).

Large MODICE Areas (NHem/Arctic/Greenland)

Sea Ice Region Comparisons by Month
Total Sea Ice Area
Total Sea Ice Extent
-------------
Baffin Area
Baffin Extent
-------------
Barents Area
Barents Extent
-------------
Beaufort Area
Beaufort Extent (Extent residuals in winter are zero because the whole region is completely covered by seaice)
-------------
Bering Area
Bering Extent
-------------
Canadian Archipelago Area
Canadian Archipelago Extent
-------------
Central Arctic Area
Central Arctic Extent
-------------
Chukchi Area
Chukchi Extent
-------------
East Siberian Area
East Siberian Extent
-------------
Greenland Area
Greenland Extent
-------------
Hudson Area
Hudson Extent
-------------
Kara Area
Kara Extent
-------------
Laptev Area
Laptev Extent
-------------
Okhotsk Area
Okhotsk Extent
-------------
St Lawrence Area
St Lawrence Extent

Arctic Mascon MODICE Areas

Sea Ice Region Comparisons by Month
Total Sea Ice Area
Total Sea Ice Extent
-------------
Baffin Area
Baffin Extent
-------------
Barents Area
Barents Extent
-------------
Beaufort Area
Beaufort Extent
-------------
Bering Area
Bering Extent
-------------
Canadian Archipelago Area
Canadian Archipelago Extent
-------------
Central Arctic Area
Central Arctic Extent
-------------
Chukchi Area
Chukchi Extent
-------------
East Siberian Area
East Siberian Extent
-------------
Greenland Area
Greenland Extent
-------------
Hudson Area
Hudson Extent
-------------
Kara Area
Kara Extent
-------------
Laptev Area
Laptev Extent
-------------
Okhotsk Area
Okhotsk Extent
-------------
St Lawrence Area
St Lawrence Extent

HMA mascon MODICE Areas

Sea Ice Region Comparisons by Month
Total Sea Ice Area
Total Sea Ice Extent
-------------
Baffin Area
Baffin Extent
-------------
Barents Area
Barents Extent
-------------
Beaufort Area
Beaufort Extent
-------------
Bering Area
Bering Extent
-------------
Canadian Archipelago Area
Canadian Archipelago Extent
-------------
Central Arctic Area
Central Arctic Extent
-------------
Chukchi Area
Chukchi Extent
-------------
East Siberian Area
East Siberian Extent
-------------
Greenland Area
Greenland Extent
-------------
Hudson Area
Hudson Extent
-------------
Kara Area
Kara Extent
-------------
Laptev Area
Laptev Extent
-------------
Okhotsk Area
Okhotsk Extent
-------------
St Lawrence Area
St Lawrence Extent

M. J. Brodzik <brodzik@nsidc.org>