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Dust and Haze Blow Across Ch …
Title Dust and Haze Blow Across China
Description Blowing desert dust adds to existing haze in the eastern basin of China. The grayish haze spread across most of the center of the image is likely a mixture of urban, industrial, and residential air pollution, possibily mingling with smoke from agricultural and other fires. Around Beijing, in the top center of the image, the haze includes a large, yellowish-tan plume of dust. Spring brings numerous dust storms to eastern China from the interior deserts, such as the Gobi Desert. According to regional news, this combination of air quality problems caused the Beijing Environmental Protection Bureau to lower the air quality index to its most unhealthy level and to advise people to stay indoors until the air clears. This image was captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua [ http://aqua.nasa.gov ] satellite on April 6, 2005. NASA image created by Jesse Allen, Earth Observatory, using data obtained from the Goddard Earth Sciences DAAC.
Dust Over Japan
Title Dust Over Japan
Description Something more than clouds hovered over Japan on April 18, 2006. Dust filled the skies as well. The dust traveled to the island nation from the Gobi Desert. The Moderate Resolution Imaging Spectroradiometer (MODIS) [ http://modis.gsfc.nasa.gov/ ] flying onboard the Terra [ http://terra.nasa.gov/ ] satellite took this picture on April 18. In this image, the eastward-moving, tan dust mingles with white clouds. An especially thick plume of dust heads toward the Korean Peninsula and the island of Japan from the west coast of China. The same day this picture was taken, Japan's Meteorological Agency announced that the dust storm reached Tokyo, the first such weather event in that city in six years. The agency predicted reduced visibility but no health hazards. Research results published in 2005, however, suggested that dust storms may carry bacteria from China to Japan. If the Japanese hoped others could understand the frustrations this dust storm caused, they needed to look no further than Beijing. Spring is the season for Gobi Dust storms, but this storm appeared to be unusually hard on China's citizens. According to news reports, it was the worst in five years, dumping some 300,000 tons of dust on Beijing. It was also the second dust storm to hit that city in a week. According to some reports, Chinese officials planned to seed clouds in hopes of bringing some relief. In 2005, a Nature paper examined China's changing environment. Partially worsened by human actions such as overgrazing and grassland degradation, dust storms began to increase in the 20th century. Between AD 300 and 1949, northwestern China saw a dust storm on average every 31 years. After 1990, the average jumped to one such storm per year. According to news reports, at the time this storm hit, the average rate of dust storms for the Beijing region (in northeastern China) was five or six a year. This storm was the eighth to hit the region in 2006. NASA image created by Jesse Allen, Earth Observatory, using data obtained from the Goddard Earth Sciences DAAC. [ http://daac.gsfc.nasa.gov/ ]
Dust Storm in the Taklimakan …
Title Dust Storm in the Taklimakan Desert
Description A large dust storm struck China's Taklimakan Desert in early December 2005. Big, dry, hot, and about as far from the ocean as anyplace on Earth, the Taklimakan Desert provides plenty of material for dust storms. Such storms have been on the rise in the region, posing a health hazard for China's people. The Moderate Resolution Imaging Spectroradiometer (MODIS) [ http://modis.gsfc.nasa.gov/ ], flying onboard the Aqua [ http://aqua.nasa.gov/ ] satellite, took this picture on December 3, 2005. In this image, the dust storm appears in pale beige, and sweeps toward the northeast. Clouds hover to the northwest and southwest, and mountains fringe the sandy basin where the dust storm originated. The Taklimakan Desert occupies the Tarim Basin between the Tien Shan Mountains in the north, and Kunlun Mountains in the south. The lowest point of this basin is about 150 meters below sea level, and because the area has no drainage, a great deal of salt has collected in the basin. The mountains to the north block cold air from the Arctic, and the location's distance from the ocean eliminates monsoon-related precipitation, so the area remains warm and dry. This desert is one of the largest shifting-sand deserts on Earth, and it supports very little vegetation. Dust storms from this region can spread all over the world, turning up in places as far away as Greenland. Closer to home, the dust poses risks to the Chinese. As reported in the scientific magazine Nature, between AD 300 and 1949, northwestern China witnessed a major dust storm on average every 31 years. Since 1990, the same region has seen a major dust storm almost every year. Besides posing visibility hazards, these storms cause respiratory illness. The storms have become more common at the same time that roughly 75 percent of China's urban population lives below the country's air-quality standard. In some areas China is taking aggressive steps to combat people's exposure to dust, including the investment of several billion dollars in a reforestation effort in the terrain around the outskirts of Beijing. NASA image courtesy of Jeff Schmaltz, MODIS Rapid Response Team [ http://rapidfire.sci.gsfc.nasa.gov/ ], NASA-Goddard Space Flight Center.
Dust Storm over Eastern Chin …
Title Dust Storm over Eastern China
Description According to Chinese news reports, a dust storm had been predicted for northern and central China between March 9 and March 12, 2006, and the prediction proved correct. On March 10, a dust storm struck the region of Beijing. The Moderate Resolution Imaging Spectroradiometer (MODIS) [ http://modis.gsfc.nasa.gov/ ] flying onboard the Aqua [ http://aqua.nasa.gov/ ] satellite captured this image on March 10, 2006. In this mage, dust mingles with clouds over northeastern China and the Korean Peninsula. The dust cloud appears as a pale tan, slightly lighter than the underlying landscape. Dust clouds obscure the view of the city of Beijing. According to Reuters News Service, the dust resulted in a rare phenomenon in South Korea: yellow snow. Snow laced with dust can pose a health hazard, and the Korean weather bureau issued a dust warning. In northeastern China and Mongolia, the storm posed the usual hazards to respiratory tracts and eyes. The Gobi Desert was the likely source of at least some of this dust. Dust storms are far from rare in the Gobi Desert in March. Dust storms in March and April can actually exceed the number of storms for all other months combined. This storm resulted from cold air from Siberia combined with low pressure from Mongolia. NASA image created by Jesse Allen, Earth Observatory, using data obtained courtesy of the MODIS Rapid Response team.
Dust Storm over Eastern Chin …
Title Dust Storm over Eastern China
Description Alhough spring dust storms are common in eastern China, 2006 surpassed the average year in the frequency and intensity of storms. On May 7, 2006, yet another dust storm swept across the North China Plain and veiled the Bo Hai from view. One reason the dust storms have been so frequent in 2006 is that drought has settled over northern China. Hebei Province and the Yellow River basin, both south of Beijing in the lower left corner of the image, received little rain between February and early May, according to the Foreign Agricultural Service [ http://www.pecad.fas.usda.gov/highlights/2006/04/china_18apr2006/ ]. Dry soil is easily lifted in the wind, and frequent dust storms have resulted. The Moderate Resolution Imaging Spectroradiometer (MODIS [ http://modis.gsfc.nasa.gov ]) on NASA's Terra [ http://terra.nasa.gov/ ] satellite captured this photo-like image of the dust storm on May 7, 2006. NASA image created by Jesse Allen, Earth Observatory, using data obtained from the Goddard Earth Sciences DAAC. [ http://daac.gsfc.nasa.gov/ ]
Smog and Sand over Beijing
Title Smog and Sand over Beijing
Description Thick smog hung over the Beijing region on April 10, 2006. The Moderate Resolution Imaging Spectroradiometer (MODIS) [ http://modis.gsfc.nasa.gov/ ] flying onboard the Terra [ http://terra.nasa.gov/ ] satellite took this picture the same day. In this image, smog appears as a hazy cloud of grey that obscures the view of the land surface. Immediately east of the smog are white clouds. According to news reports, unrest over pollution was on the rise in China in the spring of 2006. The Chinese government took steps to curb the problem, implementing a five-year economic plan aimed at improved energy efficiency, including a tax on luxury cars with large engines. NASA image created by Jesse Allen, Earth Observatory, using data obtained from the Goddard Earth Sciences DAAC. [ http://daac.gsfc.nasa.gov/ ]
Smog and Sand over Beijing
Title Smog and Sand over Beijing
Description Thick sand from one of China's famed sandstorms clouded the air over Beijing on April 17, 2006. The storm swept east from the border region between China and Mongolia and blanketed cities across China with gritty yellow sand. The storm was the eighth and worst such storm of 2006, reported the BBC. The Moderate Resolution Imaging Spectroradiometer (MODIS) [ http://modis.gsfc.nasa.gov/ ] flying onboard the Terra [ http://terra.nasa.gov/ ] satellite took this picture on the morning of April 17. In this image, a thick band of tan dust obscures the view of the land surface below. Immediately east of the sandstorm are thick clouds, colored tan by the airborne dust. Along the coastlines, brownish sediments from both China and the Korean Peninsula cloud the Yellow Sea. As Terra captured this image, The Korea Times predicted that the storm would strike Korea on the evening of April 17, 2006. NASA image created by Jesse Allen, Earth Observatory, using data obtained from the Goddard Earth Sciences DAAC. [ http://daac.gsfc.nasa.gov/ ]
Smog over Beijing, China
Title Smog over Beijing, China
Description Thick pollution obscured the sky over Beijing and nearby regions on November 4, 2005. According to news reports, [ http://www.terradaily.com/news/pollution-05zr.html ] the city's pollution index reached the highest level on the scale between November 4-5, and residents were warned to spend as little time as possible outdoors. Children, elderly, and those with respiratory conditions were cautioned to be especially careful. The Moderate Resolution Imaging Spectroradiometer (MODIS) [ http://modis.gsfc.nasa.gov/ ] flying onboard the Terra [ http://terra.nasa.gov/ ] satellite captured this image on November 4 as pollutants lingered over the area. In this image, a nearly opaque band of gray smog obscures the view of Beijing and the region to the south. Whiter clouds lie over the smog in the lower portion of the scene, while nearer to the top center of the scene, the haze appears to be hovering above a strip of fog. The rugged mountains that encircle the eastern coastal plain appear to be hemming in the haze, which spreads out in tendrils into the folds of the mountains to the north and west. Various weather conditions can contribute to a pile-up of pollution, including high pressure, high humidity, and large pools of cold air settling near the Earth's surface. Most of the time, atmospheric temperature decreases as altitude increases, and warmer air near the surface rises upward, mixing pollution away. Occasionally, the atmosphere's temperature profile can become inverted, with cold air near the surface and warm air higher up. The cold air is less buoyant, and pollution doesn't disperse. One or more of these meteorological conditions may have played a role in the poor air quality over Beijing at the end of the first week of November. As China industrializes at a record pace, air pollution problems, including acid rain and premature deaths due to respiratory and cardiovascular problems, will continue to be a challenge for the country. According to an article published on October 30, 2005, on NYT.com, acid rain affects 33 percent of China's citizens. And the scientific journal Nature published an article in June 2005 indicating that perhaps as many as 75 percent of China's city dwellers live below the country's acceptable air-quality standard. Second only to the United States in the production of greenhouse gases, China could surpass the United States in the near future as its coal-powered economy continues to grow. NASA image courtesy the MODIS Rapid Response Team [ http://rapidfire.sci.gsfc.nasa.gov ] at NASA GSFC. The MODIS Rapid Response Team provides daily images [ http://rapidfire.sci.gsfc.nasa.gov/subsets/?FAS_China4/2005308/FAS_China4.2005308.terra ] of this region.
Dust and Sand Sweeps Over No …
PIA04354
Sol (our sun)
Multi-angle Imaging SpectroR …
Title Dust and Sand Sweeps Over Northeast China
Original Caption Released with Image The Multi-angle Imaging SpectroRadiometer (MISR) captured these views of the dust and sand that swept over northeast China on March 10, 2004. Information on the height of the dust and an indication of the probable dust source region are provided by these images, which include a natural-color snapshot from MISR's nadir camera (left), a stereoscopically-retrieved height field (center) and a map of terrain elevation (right). The dust appears in the natural-color image as the pale brownish ripples that traverse the image from Inner Mongolia toward the southeast, over Beijing, Liaoning and Jilin Provinces. MISR's stereoscopic feature matching algorithm retrieves height above the surface where there is sufficient spatial contrast between several view angles. When the stereo matcher determines that a location is not covered by a feature above the surface, the terrain elevation data are displayed instead. The surface elevation map at right shows that the eastern portion of the image area, Liaonang and Jilin Provinces, is mostly low, flat terrain. These are the areas where the dust appears to be thickest and where the stereo height field indicates that the tops of the dust attain heights of up to about 1500 meters above the surface terrain. Clouds are situated between about 1 and 4 kilometers above the surface. The retrieved heights shown here are uncorrected for wind effects. The square-shaped area near the center of the stereo map is an artifact of the data processing. Areas where height could not be retrieved are shown in dark grey. A decrease in spring vegetation coverage in central and eastern Inner Mongolia has been suggested to be a major contributor to spring dust storms over northern China. http://www.agu.org/pubs/crossref/2004/2003JD003913.shtml The Multiangle Imaging SpectroRadiometer observes the daylit Earth continuously and every 9 days views the entire globe between 82 degrees north and 82 degrees south latitude. These data products were generated from a portion of the imagery acquired during Terra orbit 22481. The panels cover an area of 380 kilometers x 685 kilometers, and utilize data from blocks 54 to 58 within World Reference System-2 path 121. MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology.
Fingerprints in the Dust
PIA03405
Sol (our sun)
Multi-angle Imaging SpectroR …
Title Fingerprints in the Dust
Original Caption Released with Image These MISR nadir-camera images of eastern China compare a somewhat hazy summer view from July 9, 2000 (left) with a spectacularly dusty spring view from April 7, 2001 (middle). The left-hand and middle images are from Terra orbits 2967 and 6928, respectively, and extend from central Manchuria near the top to portions of North and South Korea at the bottom. They are approximately 380 kilometers in width. Asia's desert areas are prone to soil erosion, as underground water tables are lowered by prolonged drought and by industrial and agricultural water use. Heavy winds blowing eastward across the arid and sparsely vegetated surfaces of Mongolia and western China pick up large quantities of yellow dust. Airborne dust clouds from the April 2001 storm blew across the Pacific Ocean and were carried as far as North America. The minerals transported in this manner are believed to provide nutrients for both oceanic and land ecosystems. According to the Xinhua News Agency in China, nearly one million tons of Gobi Desert dust blow into Beijing each year. During a similar dust outbreak last year, the Associated Press reported that the visibility in Beijing had been reduced the point where buildings were barely visible across city streets, and airline schedules were significantly disrupted. The dust has also been implicated in adverse health effects such as respiratory discomfort and eye irritation. The image on the right is a higher resolution MISR nadir-camera view of a portion of the April 7, 2001 dust cloud. It covers an area roughly 250 kilometers wide by 470 kilometers high. When viewed at full magnification, a number of atmospheric wave features, like the ridges and valleys of a fingerprint, are apparent. These are probably induced by surface topography, which can disturb the wind flow. A few small cumulus clouds are also visible, and are casting shadows on the thick lower dust layer. Analyses of images such as these constitute one phase of MISR's participation in the Asian-Pacific Regional Aerosol Characterization Experiment, an international campaign aimed at studying the offshore transport of airborne particles from the Asian continent. For more about this international endeavor, see http://saga.pmel.noaa.gov/aceasia/. MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology.
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