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Emerging pattern of global change in the upper atmosphere and ionosphere

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TLDR
In this article, a pattern of the observed long-term global change in the upper atmosphere, based on trend studies of various parameters, was constructed for the first time, showing that anthropogenic emissions of greenhouse gases are affecting the atmosphere at nearly all altitudes between ground and space.
Abstract
In the upper atmosphere, greenhouse gases produce a cooling effect, instead of a warming effect. Increases in greenhouse gas concentrations are expected to induce substantial changes in the mesosphere, thermosphere, and ionosphere, including a thermal contraction of these layers. In this article we construct for the first time a pattern of the observed long-term global change in the upper atmosphere, based on trend studies of various parameters. The picture we obtain is qualitative, and contains several gaps and a few discrepancies, but the overall pattern of observed long-term changes throughout the upper atmosphere is consistent with model predictions of the effect of greenhouse gas increases. Together with the large body of lower atmospheric trend research, our synthesis indicates that anthropogenic emissions of greenhouse gases are affecting the atmosphere at nearly all altitudes between ground and space.

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The mesosphere and metals: chemistry and changes.

TL;DR: The subject of this review is the atmospheric chemistry of the metals which ablate from meteoroids in the Earth’s upper atmosphere, and the many developments that have taken place in the past decade.
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Thermospheric global average density trends, 1967–2007, derived from orbits of 5000 near‐Earth objects

TL;DR: In this paper, the authors used orbit data on ∼5000 near-Earth space objects to investigate long-term trends in thermospheric total mass density, which has been predicted to decrease with time due to increasing CO2 concentrations.
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Causes of low thermospheric density during the 2007–2009 solar minimum

TL;DR: In this article, the MgII core-to-wingratioasasolar EUV proxy index was calculated using the NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model.
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Trends in the Neutral and Ionized Upper Atmosphere

TL;DR: In this article, the authors reviewed the knowledge of long-term changes and trends in the upper atmosphere and ionosphere and presented a consistent, although incomplete, scenario of trends in F2-region ionosphere parameters, in mesosphere-lower thermosphere dynamics, and in noctilucent or polar mesospheric clouds, are discussed in more detail.
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The anomalous ionosphere between solar cycles 23 and 24

TL;DR: In this article, the authors used the NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model to show that the primary cause of density changes from 1996 to 2008 was a small reduction in solar extreme ultraviolet (EUV) irradiance, causing a decrease in thermospheric temperature and hence a contracted thermosphere.
References
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Journal ArticleDOI

How will changes in carbon dioxide and methane modify the mean structure of the mesosphere and thermosphere

TL;DR: In this paper, a global average model of the coupled mesosphere, thermosphere, and ionosphere is used to examine the effect of trace gas variations on the overall structure of these regions.
Journal ArticleDOI

Atmospheric methane levels off: Temporary pause or a new steady-state?

TL;DR: In this paper, a 3-D transport model was used to predict a decrease in CH4 emissions of ∼10 Tg CH4 from north of 50°N in the early 1990s, which may have accelerated the global methane budget towards steady state.
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Decreases in stratospheric water vapor after 2001: Links to changes in the tropical tropopause and the Brewer-Dobson circulation

TL;DR: In this paper, the authors show that the tropical tropopause has been anomalously cold during this period, and the observed water vapor changes (approximately −0.4 ppmv) are consistent with the temperature decreases.
Journal ArticleDOI

Ozone trends: A review

TL;DR: In this article, a short description of the various techniques that provided atmospheric ozone measurements valuable for long-term trend analysis is given, including satellite and ground-based measurements, with a focus on ozone depletion in the northern and southern midlatitudes.
Journal ArticleDOI

Stratospheric water vapor increases over the past half‐century

TL;DR: In this paper, the authors analyzed ten data sets covering the period 1954-2000 to show a 1% per year increase in stratospheric water vapor, which is unlikely the result of a single event but rather indicative of long-term climate change.
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Together with the large body of lower atmospheric trend research, our synthesis indicates that anthropogenic emissions of greenhouse gases are affecting the atmosphere at nearly all altitudes between ground and space.