Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements

Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements

Column HCl measurements show deviations from the expected slow decline following the regulation of chlorine-containing compounds by the Montreal Protocol. We use the simultaneous measurements of N<sub>2</sub>O and HCl by the Microwave Limb Sounder (MLS) instrument on the Aura satellit...

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Main Authors: R. S. Stolarski, A. R. Douglass, S. E. Strahan
Format: Article
Language:English
Published: Copernicus Publications 2018-04-01
Series:Atmospheric Chemistry and Physics
Online Access:https://www.atmos-chem-phys.net/18/5691/2018/acp-18-5691-2018.pdf
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spelling doaj-8fa875e6ebfb4c1aa0f53058426127402020-11-24T23:48:50ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-04-01185691569710.5194/acp-18-5691-2018Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurementsR. S. Stolarski0A. R. Douglass1S. E. Strahan2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, USAAtmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USAAtmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USAColumn HCl measurements show deviations from the expected slow decline following the regulation of chlorine-containing compounds by the Montreal Protocol. We use the simultaneous measurements of N<sub>2</sub>O and HCl by the Microwave Limb Sounder (MLS) instrument on the Aura satellite to examine this problem. We find that the use of N<sub>2</sub>O measurements at a specific altitude to represent the impact of dynamical variability on HCl results in a derived linear trend in HCl that is negative (ranging from −2.5 to 5.3 % decade<sup>−1</sup>) at all altitudes between 68 and 10 hPa. These trends are at or near 2<i>σ</i> statistical significance at all pressure levels between 68 and 10 hPa. This shows that analysis of simultaneous measurements of several constituents is a useful approach to identify small trends from data records that are strongly influenced by dynamical interannual variability.https://www.atmos-chem-phys.net/18/5691/2018/acp-18-5691-2018.pdf
collection DOAJ
language English
format Article
sources DOAJ
author R. S. Stolarski
A. R. Douglass
S. E. Strahan
spellingShingle R. S. Stolarski
A. R. Douglass
S. E. Strahan
Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements
Atmospheric Chemistry and Physics
author_facet R. S. Stolarski
A. R. Douglass
S. E. Strahan
author_sort R. S. Stolarski
title Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements
title_short Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements
title_full Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements
title_fullStr Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements
title_full_unstemmed Using satellite measurements of N<sub>2</sub>O to remove dynamical variability from HCl measurements
title_sort using satellite measurements of n<sub>2</sub>o to remove dynamical variability from hcl measurements
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2018-04-01
description Column HCl measurements show deviations from the expected slow decline following the regulation of chlorine-containing compounds by the Montreal Protocol. We use the simultaneous measurements of N<sub>2</sub>O and HCl by the Microwave Limb Sounder (MLS) instrument on the Aura satellite to examine this problem. We find that the use of N<sub>2</sub>O measurements at a specific altitude to represent the impact of dynamical variability on HCl results in a derived linear trend in HCl that is negative (ranging from −2.5 to 5.3 % decade<sup>−1</sup>) at all altitudes between 68 and 10 hPa. These trends are at or near 2<i>σ</i> statistical significance at all pressure levels between 68 and 10 hPa. This shows that analysis of simultaneous measurements of several constituents is a useful approach to identify small trends from data records that are strongly influenced by dynamical interannual variability.
url https://www.atmos-chem-phys.net/18/5691/2018/acp-18-5691-2018.pdf
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AT sestrahan usingsatellitemeasurementsofnsub2subotoremovedynamicalvariabilityfromhclmeasurements
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