Dust Storms
Dust storms can have an impact on human health, weather patterns as well as cause disruption through flight delays and the closure of highways. Data from NASA's Land, Atmosphere Near real-time Capability for EOS (LANCE) are used to monitor and predict dust storms. This information is used by agencies within the Department of Defense to improve resource allocation in remote areas and help promote aircraft safety.
- Register for an Earthdata Login to start downloading data.
- Read the LANCE disclaimer for more information about using the data.
- Learn more: Health and Air Quality Data Pathfinder
Aerosol Optical Depth
Aerosol Optical Depth (AOD) (or Aerosol Optical Thickness) indicates the level at which particles in the air (aerosols) prevent light from traveling through the atmosphere. Aerosols scatter and absorb incoming sunlight, which reduces visibility. From an observer on the ground, an AOD of less than 0.1 is “clean” - characteristic of clear blue sky, bright sun and maximum visibility. As AOD increases to 0.5, 1.0, and greater than 3.0, aerosols become so dense that sun is obscured. Sources of aerosols include pollution from factories, smoke from fires, dust from dust storms, sea salt, and volcanic ash and smog. Aerosols compromise human health when inhaled by people, particularly those with asthma or other respiratory illnesses. Aerosols also have an effect on the weather and climate by cooling or warming the earth, helping or preventing clouds from forming. Since aerosols are difficult to identify when they occur over different types of land surfaces and ocean surfaces, Worldview provides several different types of imagery layers to assist in the identification.
Corrected Reflectance Imagery
MODIS and VIIRS Corrected Reflectance imagery are available only as near real-time imagery. The imagery can be visualized in Worldview and Global Imagery Browse Services (GIBS).
More:
Information on MODIS Corrected Reflectance Imagery layers including:
- Corrected Reflectance True Color (Bands 1-4-3),
- Corrected Reflectance (Bands 3-6-7),
- Corrected Reflectance (Bands 7-2-1).
Information on VIIRS Corrected Reflectance Imagery layers including:
- Corrected Reflectance True Color (Bands I1-M4-M3),
- Corrected Reflectance (Bands M3-I3-M11),
- Corrected Reflectance (Bands M11-I2-I1).
For more on the difference between Corrected Reflectance and Surface Reflectance Imagery
Dust
Product: Instrument, Platform and Download Link |
Description |
Browse imagery in Worldview |
| AIRS (Aqua) AIRIBQAP_NRT.005 |
The AIRS Dust Score science parameter is a parameter of the AIRS Level 1B Infrared quality assurance subset (AIRIBQAP_NRT). The AIRS Dust Score (Ocean, Day | Night) layer indicates the level of atmospheric aerosols in the Earth’s atmosphere over the ocean. The numerical scale is a qualitative representation of the presence of dust in the atmosphere, an indication of where large dust storms may form and the areas that may be affected. Pixels where the dust score is less than 360 are not shown in Worldview/Global Imagery Browse Services (GIBS). The imagery resolution is 2 km, sensor resolution is 45 km and the temporal resolution is daily. L1B IR quality assurance subset |
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Land Surface Reflectance
In comparison with the MODIS Corrected Reflectance product, the MODIS Land Atmospherically Corrected Surface Reflectance product (MOD09) is a more complete atmospheric correction algorithm that includes aerosol correction, and is designed to derive land surface properties.
Product: Instrument, Platform and Download Link |
Description |
Browse imagery in Worldview |
| MODIS (Aqua) MYD09
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doi:10.5067/MODIS/MYD09.NRT.006 (Aqua) and doi:10.5067/MODIS/MOD09.NRT.006 (Terra) More information on MODIS Land Surface Reflectance Products including:
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| VIIRS (Suomi NPP) VNP09_NRT |
VIIRS Land Surface Reflectance |
Coming soon |
Visualize NRT data related to Dust Storms in Worldview
As described in an article from NASA's Earth Observatory, on February 7, 2018, the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite acquired this image of dust from the Sahara blowing over the Mediterranean Sea toward southern Europe.
According to news reports, the dust was carried by winds known as the scirocco. (In North Africa, these same desert winds are known as “chrom” (hot) or “arifi” (thirsty). The warm, dry air mass begins over the Sahara, picks up moisture over the Mediterranean, and moves north toward areas of lower pressure along the coasts of Europe.
Page Last Updated: Dec 28, 2020 at 3:02 PM EST