Encyclopedia of Geochemistry

Living Edition
| Editors: William M. White

Earth’s Atmosphere

Living reference work entry
DOI: https://doi.org/10.1007/978-3-319-39193-9_210-1
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Definition

The Earth’s atmosphere is the outer layer of our planet. This layer contains gases, commonly referred to as air.

Overview

The atmosphere is retained by the Earth’s gravity, although some of it is lost to outer space through thermal escape, known as Jeans escape. By volume, dry air contains 78.08% N2, 20.94% O2, 0.933% Ar, and 409 ppmv CO2 (CO2 data from the Mauna Loa Observatory, April 2017 at https://www.esrl.noaa.gov/gmd/ccgg/trends/monthly.html). The noble gases He, Ne, Kr, and Xe, together with CH4 and H2O (as water vapor), occur in trace concentrations (see Table 1). The total mass of the atmosphere is approximately 5.15 × 1018 kg, mainly concentrated in the first layer, called the troposphere, which extends from the topographic surface of the planet to 12 km above it.
Table 1

Twenty-first century elemental composition of dry air by volume (Data modified after Gatley et al. 2008)

Constituent (chemical symbol)

Volume %

Nitrogen (N2)

78.0818

Oxygen (O2)

20.9435

Argona...

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Authors and Affiliations

  1. 1.GEOTOP, Research Center on the dynamics of the Earth SystemUniversité du Québec à MontréalMontréalCanada