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Atmosphere of Earth The atmosphere of Earth is the layer of gases surrounding Earth that sustains Life on Earth and mediates exchanges among Hydrosphere, Lithosphere, and Biosphere. It evolved through processes tied to Great Oxygenation Event, Plate tectonics, and impacts from Late Heavy Bombardment, shaping conditions that enabled Cambrian explosion and later human civilizations such as Ancient Egypt, Indus Valley Civilization, and Ancient China to develop. Scientific understanding of atmospheric processes draws on work from researchers at institutions like NASA, National Oceanic and Atmospheric Administration, and European Space Agency.
The bulk composition is dominated by Nitrogen, Oxygen, traces of Argon, Carbon dioxide, and variable Water vapor; these constituents are measured by programs at Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and Max Planck Institute for Chemistry. Vertical structure reflects gradients in temperature and pressure described using laws from Isaac Newton's contemporaries and later formalism by Lord Kelvin and Ludwig Boltzmann; pressure at sea level approximates one standard atmosphere, a convention used by International Organization for Standardization and World Meteorological Organization. Isotopic ratios (e.g., Oxygen-18, Carbon-13) inform exchanges studied in projects like Intergovernmental Panel on Climate Change assessments and field campaigns run by Lamont–Doherty Earth Observatory.
The atmosphere is conventionally divided into layers: the Troposphere where Weather and most Aviation occur, the Stratosphere hosting the Ozone layer discovered through work by G. M. B. Dobson and monitored via missions like UARS and Aura (satellite), the Mesosphere studied by instruments on TIMED (satellite), the Thermosphere intersecting with International Space Station operations and influenced by Solar wind interactions, and the Exosphere merging into Interplanetary space observed by probes from Voyager program and Parker Solar Probe. Boundaries such as the Tropopause, Stratopause, and Mesopause are defined in atmospheric science curricula at institutions like MIT and University of Cambridge.
Radiative transfer, governed by principles from Max Planck and Johannes Kepler's legacy in optics, controls heating and cooling; absorption bands of Carbon dioxide and Methane drive greenhouse effects quantified in modeling centers like Met Office and NOAA Geophysical Fluid Dynamics Laboratory. Photochemistry in the stratosphere involves Ozone depletion mechanisms elucidated by Mario Molina and Frank Sherwood Rowland, with catalytic cycles involving Chlorofluorocarbons regulated under the Montreal Protocol. Dynamics include convection, turbulence, and wave interactions such as Rossby waves and Gravity waves examined in studies at National Center for Atmospheric Research and European Centre for Medium-Range Weather Forecasts.
Large-scale circulation features include the Hadley cell, Ferrel cell, and Polar cell, which influence climate zones studied by climatologists at Columbia University and University of Oxford. Phenomena such as El Niño–Southern Oscillation, North Atlantic Oscillation, and Pacific Decadal Oscillation modulate weather extremes observed by agencies like Japan Meteorological Agency and Met Éireann. Tropical cyclones, mid-latitude cyclones, and jet streams affect societies from Haiti to Japan and are forecasted using models developed at ECMWF and supercomputing centers like Oak Ridge National Laboratory.
Atmospheric composition and circulation influence terrestrial and marine ecosystems, linking to processes such as Photosynthesis in Amazon Rainforest and oceanic carbon uptake by Phytoplankton studied by Monterey Bay Aquarium Research Institute. Volcanic eruptions at Mount Pinatubo and Krakatoa injected aerosols that altered radiative balance, with impacts analyzed by researchers at Geological Survey of Japan and USGS. Soil respiration, wildfires in regions like Siberia and California, and biogenic emissions from Boreal forests feed back to atmospheric chemistry monitored by networks including Global Atmosphere Watch.
Anthropogenic emissions of Carbon dioxide, Methane, and Nitrous oxide from sectors tied to civilizations from Industrial Revolution centers in United Kingdom to modern industrial hubs like Shanghai drive climate change documented by IPCC reports and national assessments by United States Environmental Protection Agency. Policies such as the Paris Agreement and earlier Kyoto Protocol aim to limit warming through mitigation and adaptation frameworks implemented by entities like United Nations Framework Convention on Climate Change and national agencies including Environment and Climate Change Canada. Air pollution events, exemplified by smog episodes in London and Beijing, prompted regulatory responses such as emission standards from European Union institutions and public health studies at World Health Organization.
Observational techniques range from ground-based networks like AERONET and stations such as Mauna Loa Observatory to satellite platforms including MODIS, Sentinel series, and ICESat. Radiosondes launched from meteorological services (e.g., Météo-France) provide vertical profiles, while remote sensing instruments on Landsat and missions by NOAA supply synoptic data assimilated into reanalyses like ERA5 and NCEP/NCAR Reanalysis. Laboratory experiments at facilities like Lawrence Berkeley National Laboratory and field campaigns led by NOAA ESRL refine understanding of microphysical processes used in climate models developed at Hadley Centre.