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. 2009 Nov 2;106(46):19405–19409. doi: 10.1073/pnas.0906448106

Table 1.

Area of terrestrial landmass (km2) found at four zones representing distances to the ocean and potential oceanic aerosols

Location Distance
% >100 km inland
<10 km 10–100 km 100–1,000 km > 1,000 km
Continent
    Africa 1.66E + 05 2.85E + 06 2.11E + 07 5.40E + 06 89.8
    Asia 6.12E + 05 6.83E + 06 3.00E + 07 5.58E + 06 82.7
    Australia 6.99E + 04 1.13E + 06 6.30E + 06 0.00E + 00 84.0
    North America 9.67E + 05 6.40E + 06 1.47E + 07 6.09E + 05 67.5
    Oceania 2.92E + 04 2.25E + 05 7.05E + 03 0.00E + 00 2.7
    South America 1.42E + 05 1.87E + 06 1.23E + 07 3.14E + 06 88.5
    Antarctica 6.79E + 05 3.74E + 06 7.81E + 06 0.00E + 00 63.9
    Europe 3.19E + 05 2.71E + 06 6.31E + 06 0.00E + 00 67.6
Ecoregion domain
    Dry 3.87E + 05 3.92E + 06 3.33E + 07 9.12E + 06 90.8
    Humid temperate 8.92E + 05 6.03E + 06 1.48E + 07 7.23E + 05 69.1
    Humid tropical 9.26E + 05 7.08E + 06 2.60E + 07 4.75E + 06 79.4
    Polar 2.40E + 06 1.14E + 07 2.44E + 07 1.30E + 05 64.1
Ecoregion divisions with largest inland regions
    Temperate desert regime mountains 0.00E + 00 0.00E + 00 6.15E + 04 5.53E + 05 100.0
    Temperate steppe regime mountains 0.00E + 00 1.10E + 03 6.65E + 05 4.02E + 05 99.9
    Temperate steppe 2.21E + 04 2.09E + 05 4.03E + 06 5.33E + 05 95.2
    Tropical/subtropical desert regime mountains 2.55E + 04 2.06E + 05 1.59E + 06 1.37E + 06 92.7
    Tropical/subtropical desert 1.32E + 05 1.35E + 06 1.32E + 07 2.58E + 06 91.4
    Temperate desert 4.43E + 04 4.33E + 05 3.32E + 06 1.69E + 06 91.3
    Prairie regime mountains 1.12E + 04 1.04E + 05 8.50E + 05 2.93E + 05 90.9
    Prairie 3.61E + 04 4.03E + 05 3.82E + 06 1.67E + 05 90.1
    Tropical/subtropical steppe regime     mountains 4.87E + 04 4.68E + 05 3.33E + 06 6.96E + 05 88.6
    Savanna 2.83E + 05 2.49E + 06 1.49E + 07 2.92E + 06 86.5
    Tropical/subtropical steppe 1.15E + 05 1.25E + 06 7.16E + 06 1.29E + 06 86.1
    Subtropical regime mountains 3.25E + 04 2.19E + 05 1.05E + 06 2.42E + 05 83.7
    Sub-Arctic division 1.90E + 05 2.09E + 06 1.00E + 07 7.78E + 03 81.4

Data summarized for continents and ecoregions follow Bailey and Ropes (48). Coastlines were extracted from the Digital Chart of the World (54) and used to estimate area within five rings of distances from the sea at 5 × 5-km resolution.