Blar i Bergen Open Research Archive på forfatter "Maliniemi, Ville Aleksi"
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Assessing North Atlantic winter climate response to geomagnetic activity and solar irradiance variability
Maliniemi, Ville Aleksi; Asikainen, Timo; Salminen, Antti; Mursula, Kalevi (Peer reviewed; Journal article, 2019)Recent studies suggest a response in the North Atlantic winter circulation which lags by a couple of years with respect to sunspot maximum. This has been explained by two different top‐down mechanisms: a solar wind driven ... -
Comparing the effects of solar-related and terrestrial drivers on the northern polar vortex
Salminen, Antti; Maliniemi, Ville Aleksi; Asikainen, Timo; Mursula, Kalevi (Journal article; Peer reviewed, 2020)Northern polar vortex experiences significant variability during Arctic winter. Solar activity contributes to this variability via solar irradiance and energetic particle precipitation. Recent studies have found that ... -
Dependence of Sudden Stratospheric Warmings on Internal and External Drivers
Salminen, Antti; Asikainen, T.; Maliniemi, Ville Aleksi; Mursula, K. (Journal article; Peer reviewed, 2020)A sudden stratospheric warming (SSW) is a large-scale disturbance of the wintertime stratosphere, which occurs especially in the Northern Hemisphere. Earlier studies have shown that SSW occurrence depends on atmospheric ... -
Determining Latitudinal Extent of Energetic Electron Precipitation Using MEPED On-Board NOAA/POES
Babu, Eldho Midhun; Tyssøy, Hilde Nesse; Smith-Johnsen, Christine; Maliniemi, Ville Aleksi; Salice, Josephine Alessandra; Millan, R.M.; Richardson, I.G. (Journal article; Peer reviewed, 2022)Energetic Electron Precipitation (EEP) from the plasma sheet and the radiation belts ionizes the polar lower thermosphere and mesosphere. EEP increases the production of NOx and HOx, which will catalytically destroy ozone, ... -
The Direct Effect of Medium Energy Electron Precipitation on Mesospheric Dynamics During a Sudden Stratospheric Warming Event in 2010
Zuniga Lopez, Hector Daniel; Tyssøy, Hilde Nesse; Smith-Johnsen, Christine; Maliniemi, Ville Aleksi (Journal article; Peer reviewed, 2022)Medium energy electron (MEE) (30–1,000 keV) precipitation enhances the production of nitric (NOx) and hydrogen oxides (HOx) throughout the mesosphere, which can destroy ozone (O3) in catalytic reactions. The dynamical ... -
Effect of Energetic Electron Precipitation on the Northern Polar Vortex: Explaining the QBO Modulation via Control of Meridional Circulation
Salminen, A; Asikainen, T.; Maliniemi, Ville Aleksi; Mursula, K. (Peer reviewed; Journal article, 2019)Energetic electron precipitation (EEP) affects the high‐latitude middle atmosphere by producing NOX compounds that destroy ozone. Earlier studies have shown that in the wintertime polar stratosphere, increased EEP enhances ... -
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 ... -
The influence of energetic particle precipitation on Antarctic stratospheric chlorine and ozone over the 20th century
Maliniemi, Ville Aleksi; Arsenovic, Pavle; Seppälä, Annika; Tyssøy, Hilde Nesse (Journal article; Peer reviewed, 2022)Chlorofluorocarbon (CFC) emissions in the latter part of the 20th century reduced stratospheric ozone abundance substantially, especially in the Antarctic region. Simultaneously, polar stratospheric ozone is also destroyed ... -
Influence of Enhanced Planetary Wave Activity on the Polar Vortex Enhancement Related to Energetic Electron Precipitation
Asikainen, T.; Salminen, Antti; Maliniemi, Ville Aleksi; Mursula, K. (Journal article; Peer reviewed, 2020)The Northern polar vortex experiences considerable interannual variability, which is also reflected to tropospheric weather. Recent research has established a link between polar vortex variations and energetic electron ... -
The Mansurov effect: Seasonal and solar wind sector structure dependence
Edvartsen, Jone Øvretvedt; Maliniemi, Ville Aleksi; Nesse, Hilde; Hatch, Spencer Mark (Journal article; Peer reviewed, 2023)We investigate the connection between the interplanetary magnetic field (IMF) By-component and polar surface pressure, also known as the Mansurov effect. The aim of the investigation is to unravel potential dependencies ... -
The Mansurov effect: Statistical significance and the role of autocorrelation
Edvartsen, Jone Øvretvedt; Maliniemi, Ville Aleksi; Tyssøy, Hilde Nesse; Asikainen, Timo; Hatch, Spencer Mark (Journal article; Peer reviewed, 2022)The Mansurov effect is related to the interplanetary magnetic field (IMF) and its ability to modulate the global electric circuit, which is further hypothesized to impact the polar troposphere through cloud generation ... -
Mesospheric Nitric Oxide Transport in WACCM
Smith-Johnsen, Christine; Marsh, Daniel Robert; Smith, Anne K.; Tyssøy, Hilde Nesse; Maliniemi, Ville Aleksi (Journal article; Peer reviewed, 2022)Energetic particle precipitation (EPP) causes ionization of the main constituents of the Earth's atmosphere which leads to the production of nitric oxide (NO) throughout the polar mesosphere and lower thermosphere (MLT). ... -
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 ...