ASTER images are being used in an ambitious international project to map the extent of the worlds glaciers and the rate at which they are changing. High-resolution ASTER images make it possible to distinguish and track small features on glacier surfaces. Images presented by Rick Wessels from Arizona State University showing details of snow and ice of glaciers are contributing to the Global Land Ice Measurements from Space (GLIMS) project, a global consortium led by the U.S. Geological Survey.
This animation is of Acadia National Park in Maine. This animation was done as part of a series of animations to show Landsats view of our National Parks.
This lesson is designed to help students gain knowledge in accessing current weather data and in using the MY NASA DATA Live Access Server (LAS) to specify and download historical satellite data.
Aqua, Latin for water, is a NASA Earth Science satellite mission named for the large amount of information that the mission is collecting about the Earth's water cycle, including evaporation from the oceans, water vapor in the atmosphere, clouds, precipitation, soil moisture, sea ice, land ice, and snow cover on the land and ice. Additional variables also measured by Aqua include radiative energy fluxes, aerosols, vegetation cover on the land, phytoplankton and dissolved organic matter in the oceans, and air, land, and water temperatures. This brochure provides a comprehensive overview of the Aqua spacecraft, instruments, science, and data products.
AMSR-E is a passive microwave radiometer, all the channels are in microwave spectrum, not in visible spectrum. The image is to express the water planet by simple color composite. Three day average data. Using only the descending paths, nightside orbits.
AMSR-E is a passive microwave radiometer, all the channels are in microwave spectrum, not in visible spectrum. The image is to express the water planet by simple color composite. Three day average data. Using only the descending paths, nightside orbits.
This USGS site explains what an aquifer is and defines the different types of aquifers based on six principal lithologies; sandstone, carbonate, sandstone-carbonate, igneous and metamorphic, sand and gravel, and other rock types. The site features maps and descriptions of the major aquifers in the United States as well as general information about groundwater occurrence and quality. The site also provides links to additional maps and data about specific aquifers across the nation.
The Aral Sea is actually not a sea at all, but an immense fresh water lake. In the last thirty years, more than sixty percent of the lake has disappeared because much of the river flow feeding the lake was diverted to irrigate cotton fields and rice paddies. Concentrations of salts and minerals began to rise in the shrinking body of water, leading to staggering alterations in the lakes ecology and precipitous drops in the Arals fish population. Powerful winds that blow across this part of Asia routinely pick up and deposit the now exposed lake bed soil. This has contributed to a significant reduction in breathable air quality, and crop yields have been appreciably affected due to heavily salt laden particles falling on arable land. This series of Landsat images taken in 1973, 1987 and 2000 show the profound reduction in overall area at the north end of the Aral, and a commensurate increase in land area as the floor of the sea now lies exposed.
This site provides information about the distribution of arsenic in ground water of the United States. The site features links to publications such as fact sheets, research and reports, as well as numerical data collected from over 20,000 wells. The site also provides maps that show where and to what extent arsenic occurs in ground water across the country. Links to additional resources related to arsenic and drinking water are also included.
This site provides an illustrated lecture from a geochemistry course offered by Dr. Scott Wood at the University of Idaho. Topics include a review of the structure and formation of the Earth's crust, atmosphere, and hydrological cycle, and the composition of the atmosphere. Additional topics covered are the concept of residence time, geological and biological sources of components in the atmosphere, acid-base theory, Henry's law and the solubility of gases in water, primary and secondary air pollution, acid rain and how to carry out calculations of the pH of solutions containing acids, among others. The lecture presentation may be downloaded as a PDF document or a PowerPoint presentation. Reading and homework assignments, with answers, are also provided.
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