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'''Equivalent effective stratospheric chlorine''' (EESC) provides an estimate of the total effective amount of [[halogens]] ([[chlorine]] and [[bromine]]) in the [[stratosphere]]. It is calculated from emission of [[chlorofluorocarbon]] and related halogenated compounds into the [[troposphere]] (lower atmosphere) and their efficiency in contributing to stratospheric ozone depletion (ozone depletion potential, ODP), and by making assumptions on transport times into the upper atmosphere ([[stratosphere]]).<ref>Newman, P. A., Daniel, J. S., Waugh, D. W., and Nash, E. R.: A new formulation of equivalent effective stratospheric chlorine (EESC), Atmos. Chem. Phys., 7, 4537-4552, {{doi|10.5194/acp-7-4537-2007}}, 2007.</ref> This parameter is used to quantify man-made [[ozone depletion]] and its changes with time. As a consequence of the [[Montreal Protocol]] and its amendments phasing out ozone-depleting substances (ODS), the EESC reached maximum in the late 1990s and is now slowly decreasing. |
'''Equivalent effective stratospheric chlorine''' (EESC) provides an estimate of the total effective amount of [[halogens]] ([[chlorine]] and [[bromine]]) in the [[stratosphere]]. It is calculated from emission of [[chlorofluorocarbon]] and related halogenated compounds into the [[troposphere]] (lower atmosphere) and their efficiency in contributing to stratospheric ozone depletion (ozone depletion potential, ODP), and by making assumptions on transport times into the upper atmosphere ([[stratosphere]]).<ref>Newman, P. A., Daniel, J. S., Waugh, D. W., and Nash, E. R.: A new formulation of equivalent effective stratospheric chlorine (EESC), Atmos. Chem. Phys., 7, 4537-4552, {{doi|10.5194/acp-7-4537-2007}}, 2007.</ref> This parameter is used to quantify man-made [[ozone depletion]] and its changes with time. As a consequence of the [[Montreal Protocol]] and its amendments phasing out ozone-depleting substances (ODS), the EESC reached maximum in the late 1990s and is now slowly decreasing. |
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Latest revision as of 18:03, 23 May 2021
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Equivalent effective stratospheric chlorine (EESC) provides an estimate of the total effective amount of halogens (chlorine and bromine) in the stratosphere. It is calculated from emission of chlorofluorocarbon and related halogenated compounds into the troposphere (lower atmosphere) and their efficiency in contributing to stratospheric ozone depletion (ozone depletion potential, ODP), and by making assumptions on transport times into the upper atmosphere (stratosphere).[1] This parameter is used to quantify man-made ozone depletion and its changes with time. As a consequence of the Montreal Protocol and its amendments phasing out ozone-depleting substances (ODS), the EESC reached maximum in the late 1990s and is now slowly decreasing.
References
[edit]- ^ Newman, P. A., Daniel, J. S., Waugh, D. W., and Nash, E. R.: A new formulation of equivalent effective stratospheric chlorine (EESC), Atmos. Chem. Phys., 7, 4537-4552, doi:10.5194/acp-7-4537-2007, 2007.