2025年1月23日 · The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the 'column' of air lying directly above the point in question.

4 天之前 · Earth's atmosphere is a layer of mixed gases approximately 60 miles high that provides the air we breathe, shields us from dangerous levels of ultraviolet light from the sun, and traps enough heat to maintain a livable environment.

2025年1月23日 · Accurate early warnings of poor air quality are useful because they give people the option to reduce their risk of exposure to poor air by limiting outdoor activity at these times. Air quality forecasters use near real-time (NRT) data from NASA's Land, Atmosphere Near real-time Capability for Earth observation ( LANCE ) to improve some local ...

2024年1月11日 · That same year, the U.S. Congress passed the Clean Air Act , which empowered the EPA to regulate six criteria air pollutants: particulate matter (PM, also known as particle pollution), ozone (O 3), sulfur dioxide (SO 2), nitrogen dioxide (NO 2), carbon monoxide (CO), and lead (Pb). As a result of the CAA's tighter regulations on the emissions ...

The Earthdata Developer Portal is for application developers who wish to build applications that search, access, and browse Earth science data archived by NASA's Earth Observing System Data and Information System ().

Launched in 2002, the Atmospheric Infrared Sounder (AIRS) instrument aboard NASA’s Aqua satellite provides 3D measurements of temperature, water vapor, trace gases, and surface and cloud properties through the atmospheric column.

Carrying a payload of air pressure, temperature and humidity probes, the aircraft can fly at altitudes from near the surface to 21,000 feet at speeds of 50-95 mph for periods of up to 30 hours. Controlled by dual computers and navigated by GPS, the Aerosonde is designed to economically collect meteorological data over a wide area.

Explore Learning Resources. NASA’s massive archive of Earth science data are free and open to any user for any purpose—but accessing, analyzing, visualizing, and applying these data requires a certain degree of knowledge about Earth observation data and how it is collected and optimized.

2020年1月1日 · The surface meteorological data variables include temperature, dew point, relative humidity, absolute humidity, mixing ratio, air pressure, windspeed, and wind direction. The dataset files are available from January 1, 2020, through January 25, 2023, in netCDF-4 and ASCII-CSV formats.

2025年1月15日 · A measure of height, especially of great height, as a mountain top or aircraft flight level. In meteorology, altitude is used almost exclusively with respect to the height of an airborne object above the earth's surface, above a constant pressure surface, or …