Formaldehyde (HCHO) plays a role in determining the oxidizing capacity of the global troposphere. The principal source of HCHO is the oxidation of methane (CH4
), which provides a global ambient background. Minor direct HCHO sources include biomass burning, industry, agriculture, automobiles, shipping, and vegetation
The Nature of Ozone in Deep Convective Clouds
Ozone within deep convective clouds is controlled by several factors involving photochemical reactions and transport. Gas-phase photochemical reactions and heterogeneous surface chemical reactions involving ice, water particles, and aerosols inside the clouds all contribute to the distribution and net production and loss of ozone.
Images Highlight U.S. Air Quality Improvement
After ten years in orbit, the Ozone Monitoring Instrument (OMI) has been in orbit sufficiently long to show that people in major U.S. cities are breathing less nitrogen dioxide--a yellow-brown gas that can cause respiratory problems.
OMI sees BrO enhancements over the North Pole
OMI, with its wide swath, is the only instrument that can detect Bromine Monoxide (BrO) at the pole on every orbit. Here, stratospheric BrO has been carefully separated from the total column to produce estimates of the tropospheric BrO column.
Decrease in SO2 over the Eastern US
OMI data confirm a substantial reduction in sulfur dioxide (SO2
) values around the largest US coal power plants as a result of the implementation of pollution control measures.
Pollution episode over China
Aura observes a high-pressure weather system settled in over eastern China, in which air pollution began to accumulate locally for nearly a week.
Aura and CALIPSO
Combined use of A-train data for improved aerosol characterization
Sarychev Peak Eruption
The eruption of Sarychev Peak (Kurile Islands) in mid-June 2009 produced a large stratospheric sulfur dioxide cloud that spread rapidly eastward in strong jet stream winds.
NO2 in the Troposphere
View collection of movies created from Aura's OMI instrument of NO2 in the troposphere.
Fires In Southern California
NASA satellites continue to capture remarkable new images of the wildfires raging in Southern California. Aura's OMI images show the smoke aerosol layer generated by the fires in Southern California as it drifts over the Pacific Ocean.
OMI captured the SO2 cloud in 2 consecutive orbits of the eruption in the Aleutians.
Air Quality during the Olympics
Restrictions were put on traffic and power plants to improve air quality in Beijing during the Olympics. OMI makes daily measurements of the total column of SO2
Sulfur dioxide measurements from the Ozone Monitoring Instrument (OMI) on Aura permitted tracking of the eruption cloud in near real-time.
Springtime OMI Measurements of BrO
Despite its low atmospheric abundance, bromine monoxide (BrO) plays an important role in the chemistry of the atmosphere because it is a catalyst of the ozone destruction.
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