composition of air
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composition of air is a complex mixture of various gases that surrounds the Earth, with the exact proportions of these gases varying depending on factors such as altitude, latitude, and weather patterns. The study of the composition of air is crucial for understanding atmospheric science, climate change, and the environmental impact of human activities, as noted by National Aeronautics and Space Administration (NASA) and the Intergovernmental Panel on Climate Change (IPCC). Researchers at Harvard University, University of California, Berkeley, and the National Oceanic and Atmospheric Administration (NOAA) have made significant contributions to our understanding of the composition of air. The European Space Agency (ESA) and the Japanese Aerospace Exploration Agency (JAXA) have also conducted extensive research on the composition of air using satellites such as Envisat and Aqua.
Introduction
The composition of air is a vital aspect of Earth science, as it affects the climate, weather patterns, and the habitability of our planet, as discussed by James Hansen and Stephen Schneider. The United States Environmental Protection Agency (EPA) and the World Health Organization (WHO) have established guidelines for monitoring and regulating the composition of air to protect human health and the environment. Scientists at Massachusetts Institute of Technology (MIT), Stanford University, and the University of Oxford have developed models to predict changes in the composition of air due to human activities such as fossil fuel combustion and deforestation, which are also studied by the Food and Agriculture Organization (FAO) of the United Nations. The International Energy Agency (IEA) and the World Bank have also analyzed the impact of energy production and consumption on the composition of air.
Components of Air
The composition of air is primarily made up of nitrogen (78%) and oxygen (21%), with trace amounts of argon, carbon dioxide, and other gases, as measured by spectroscopy and gas chromatography at Los Alamos National Laboratory and the Lawrence Berkeley National Laboratory. The National Institute of Standards and Technology (NIST) and the European Commission's Joint Research Centre have established standards for the measurement of these gases. Researchers at University of Cambridge, University of Chicago, and the California Institute of Technology (Caltech) have studied the role of aerosols and particulate matter in the composition of air, which is also a focus of the National Science Foundation (NSF) and the European Research Council (ERC). The American Meteorological Society (AMS) and the Royal Meteorological Society (RMetS) have published studies on the composition of air in various meteorological contexts.
Gases in the Atmosphere
The atmosphere contains a variety of gases, including water vapor, methane, and ozone, which play important roles in the Earth's energy balance and climate system, as described by Syukuro Manabe and Klaus Hasselmann. The National Center for Atmospheric Research (NCAR) and the University Corporation for Atmospheric Research (UCAR) have conducted research on the distribution and behavior of these gases. Scientists at Columbia University, University of Michigan, and the Scripps Institution of Oceanography have studied the impact of human activities on the concentrations of these gases, which is also a concern of the United Nations Framework Convention on Climate Change (UNFCCC) and the International Council for Science (ICSU). The European Union's Horizon 2020 program and the National Aeronautics and Space Administration's (NASA) Earth Science Division have funded research on the composition of air and its relation to climate change.
Variations in Composition
The composition of air varies depending on factors such as altitude, latitude, and weather patterns, as observed by weather balloons and satellites such as Terra and Aqua. Researchers at University of Colorado Boulder, University of Washington, and the National Center for Atmospheric Research (NCAR) have studied the variations in the composition of air in different atmospheric layers, including the troposphere and stratosphere. The World Meteorological Organization (WMO) and the International Association of Meteorology and Atmospheric Sciences (IAMAS) have established standards for monitoring and predicting changes in the composition of air. Scientists at Imperial College London, University of Toronto, and the Australian National University have developed models to simulate the variations in the composition of air due to natural climate variability and human-induced climate change, which is also a focus of the Intergovernmental Panel on Climate Change (IPCC) and the National Oceanic and Atmospheric Administration (NOAA).
Measurement and Analysis
The measurement and analysis of the composition of air are crucial for understanding atmospheric chemistry and climate science, as noted by Paul Crutzen and Mario Molina. Researchers at Max Planck Institute for Chemistry, University of California, Los Angeles (UCLA), and the National Institute of Standards and Technology (NIST) have developed techniques such as mass spectrometry and gas chromatography to measure the concentrations of various gases in the atmosphere. The European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA) have launched satellites such as Envisat and Aura to monitor the composition of air from space. Scientists at University of Edinburgh, University of Bristol, and the British Antarctic Survey have analyzed the composition of air in ice cores and sediment cores to reconstruct past changes in the atmosphere, which is also a focus of the International Geosphere-Biosphere Programme (IGBP) and the Past Global Changes (PAGES) project.
Atmospheric Layers
The atmosphere is divided into several layers, including the troposphere, stratosphere, mesosphere, and thermosphere, each with distinct characteristics and compositions, as described by Richard Lindzen and John Houghton. Researchers at University of Arizona, University of Wisconsin–Madison, and the National Center for Atmospheric Research (NCAR) have studied the composition of air in each of these layers, which is also a concern of the World Meteorological Organization (WMO) and the International Association of Meteorology and Atmospheric Sciences (IAMAS). Scientists at University of Leeds, University of Reading, and the Met Office have developed models to simulate the behavior of the atmosphere in each layer, which is also a focus of the European Centre for Medium-Range Weather Forecasts (ECMWF) and the National Centers for Environmental Prediction (NCEP). The National Science Foundation (NSF) and the European Research Council (ERC) have funded research on the composition of air and its relation to atmospheric circulation and climate variability.