Urban Signatures: Latent Heat Flux (WMS)
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Big cities influence the environment around them. For example, urban areas are typically warmer than their surroundings. Cities are strikingly visible in computer models that simulate the Earth's land surface. This visualization shows latent heat flux predicted by the Land Information System (LIS) for a day in June 2001. (Latent heat flux refers to the transfer of energy from the Earth's surface to the air above by evaporation of water on the surface; for a more detailed explanation see http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/energy/energy_balance.html). Latent heat flux is lower in the cities because there is less evaporation there. Only part of the global computation is shown, focusing on the highly urbanized northeast corridor in the United States, including the cities of Boston, New York, Philadelphia, Baltimore, and Washington.
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This image shows latent heat flux (watts per
square meter) predicted by LIS for 2001/06/11. The urban areas
stand out very distinctly against their surroundings, which have
more evaporation and therefore greater latent heat
flux.
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Latent heat flux color bar, with scale ranging from 0 to 450 W/m2.
Available formats:
320 x 90
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