Image from TERRA
Thu, 22 Oct 2020 11:00 EDT

NASA scientists are combining data from water samples containing fish DNA with satellite data to find native fish and identify their habitats.

Image from TERRA
Fri, 25 Sep 2020 10:00 EDT

The August Complex Fire and others this fire season have been sending far-reaching plumes of wildfire smoke into the atmosphere that worsen air quality in California and beyond. Predicting where that smoke will travel and how bad the air will be downwind is a challenge, but Earth-observing satellites can help.

Image from TERRA
Thu, 10 Sep 2020 10:46 EDT

The year 2020 will be remembered for being a very trying year and western wildfires have just added to the year's woes.

Comparing Land Surface and Air Temperatures of Urban Heat Islands Over the Contiguous USA

Urban Heat Islands are caused by materials in buildings, parking lots, and other infrastructures in cities that capture and store radiation from the sun.  Often these materials are impervious, meaning that no liquid can penetrate directly into the ground. These materials release energy at night in the form of heat.  A recent publication presented at American Geophysical Union sought to assess the urban surface heat island signature on land surface temperature change over the United States and make comparisons to local air temperatures provided by the Global Historical Climatology Network. The team used the National Land Cover Database Impervious Surface Area and the MODIS Land Surface Database from 2001 and 2006.

The team overlaid the National Land Cover Database Impervious Surface Area map over the local air temperatures from the Global Historical Climatology Network station distribution map, identifying over 300 urban settlements.  They compared the local air temperatures versus the land surface temperatures at night and at midday. They found that the observed temperature change was evident in both sets of data, however the magnitude differed. Local air temperatures from the Global Historical Climatology Network tend to underestimate the surface temperatures during daytime, especially during summer and in non-forested stations.

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