Blar i Bergen Open Research Archive på forfatter "Marsh, Daniel R."
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Effects of enhanced downwelling of NOx on Antarctic upper-stratospheric ozone in the 21st century
Maliniemi, Ville Aleksi; Tyssøy, Hilde Nesse; Smith-Johnsen, Christine; Arsenovic, Pavle; Marsh, Daniel R. (Journal article; Peer reviewed, 2021)Ozone is expected to fully recover from the chlorofluorocarbon (CFC) era by the end of the 21st century. Furthermore, because of anthropogenic climate change, a cooler stratosphere decelerates ozone loss reactions and is ... -
Mesospheric nitric acid enhancements during energetic electron precipitation events simulated by WACCM‐D
Orsolini, Yvan; Smith-Johnsen, Christine; Marsh, Daniel R.; Stordal, Frode; Rodger, Craig J.; Verronen, Pekka T.; Clilverd, Mark A. (Peer reviewed; Journal article, 2018-07)While observed mesospheric polar nitric acid enhancements have been attributed to energetic particle precipitation through ion cluster chemistry in the past, this phenomenon is not reproduced in current whole‐atmosphere ... -
Nitric Oxide Response to the April 2010 Electron Precipitation Event: Using WACCM and WACCM‐D With and Without Medium‐Energy Electrons
Smith-Johnsen, Christine; Marsh, Daniel R.; Orsolini, Yvan; Tyssøy, Hilde Nesse; Hendrickx, Koen; Sandanger, Marit Irene J.; Ødegaard, Linn-Kristine Glesnes; Stordal, Frode (Peer reviewed; Journal article, 2018-06-07)Energetic electrons from the magnetosphere deposit their energy in the atmosphere and lead to production of nitric oxide (NO) in the mesosphere and lower thermosphere. We study the atmospheric NO response to a geomagnetic ... -
Production and transport mechanisms of NO in the polar upper mesosphere and lower thermosphere in observations and models
Hendrickx, Koen; Megner, Linda; Marsh, Daniel R.; Smith-Johnsen, Christine (Peer reviewed; Journal article, 2018-06-28)A reservoir of nitric oxide (NO) in the lower thermosphere efficiently cools the atmosphere after periods of enhanced geomagnetic activity. Transport from this reservoir to the stratosphere within the winter polar vortex ... -
Will Climate Change Impact Polar NOx Produced by Energetic Particle Precipitation?
Maliniemi, Ville Aleksi; Marsh, Daniel R.; Tyssøy, Hilde Nesse; Smith-Johnsen, Christine (Journal article; Peer reviewed, 2020)Energetic electron precipitation (EEP) is an important source of polar nitrogen oxides (NOx) in the upper atmosphere. During winter, mesospheric NOx has a long chemical lifetime and is transported to the stratosphere by ...