Blar i NILU Brage på forfatter "Orsolini, Yvan J."
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The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation
Guttu, Sigmund; Orsolini, Yvan J.; Stordal, Frode; Otterå, Odd Helge; Omrani, Nour-Eddine (Peer reviewed; Journal article, 2021)The stratospheric, tropospheric and surface impacts from the 11 year ultraviolet solar spectral irradiance (SSI) variability have been extensively studied using climate models and observations. Here, we demonstrate using ... -
Abrupt Change in the Lower Thermospheric Mean Meridional Circulation During Sudden Stratospheric Warmings and Its Impact on Trace Species
Orsolini, Yvan J.; Zhang, Jiarong; Limpasuvan, Varavut (Peer reviewed; Journal article, 2022)Based on the hourly output from the 2000–2014 simulations of the National Center for Atmospheric Research's vertically extended version of the Whole Atmosphere Community Climate Model in specified dynamics configuration, ... -
Arctic sea-ice loss intensifies aerosol transport to the Tibetan Plateau
Li, Fei; Wang, Huijun; Orsolini, Yvan J.; Cong, Zhiyuan; Gao, Yongqi; Kang, Shichang (Peer reviewed; Journal article, 2020)The Tibetan Plateau (TP) has recently been polluted by anthropogenic emissions transported from South Asia, but the mechanisms conducive to this aerosol delivery are poorly understood. Here we show that winter loss of ... -
The Atlantic Multidecadal Variability phase-dependence of teleconnection between the North Atlantic Oscillation in February and the Tibetan Plateau in March
Li, Jingyi; Li, Fei; He, Shengping; Wang, Huijun; Orsolini, Yvan J. (Peer reviewed; Journal article, 2021) -
Climatological Westward‐Propagating Semidiurnal Tides and Their Composite Response to Sudden Stratospheric Warmings in SuperDARN and SD‐WACCM‐X
Zhang, Z.; Limpasuvan, Varavut; Orsolini, Yvan J.; Espy, Patrick Joseph; Hibbins, Robert (Peer reviewed; Journal article, 2021)Using the Super Dual Auroral Radar Network observations (clustered around 60°N) and NCAR CESM2.0 extended Whole Atmosphere Community Climate Model nudged with reanalyzes, we examine the climatology of semidiurnal tides in ... -
Eastward-Propagating Planetary Waves Prior to the January 2009 Sudden Stratospheric Warming
Rhodes, Christian Todd; Limpasuvan, Varavut; Orsolini, Yvan J. (Peer reviewed; Journal article, 2021)Eastward-propagating planetary waves (EPWs) were investigated prior to the boreal January 2009 major sudden stratospheric warming (SSW) event simulated by the National Center for Atmospheric Research's Whole Atmosphere ... -
Elevated stratopause events in the current and a future climate: A chemistry-climate model study
Scheffler, Janice; Ayarzagüena, Blanca; Orsolini, Yvan J.; Langematz, Ulrike (Peer reviewed; Journal article, 2021)The characteristics and driving mechanisms of Elevated Stratopause Events (ESEs) are examined in simulations of the ECHAM/MESSy Atmospheric Chemistry (EMAC) chemistry-climate model under present and projected climate ... -
Impact of Eurasian autumn snow on the winter North Atlantic Oscillation in seasonal forecasts of the 20th century
Wegmann, Martin; Orsolini, Yvan J.; Weisheimer, Antje; Van Den Hurk, Bart; Lohmann, Gerrit (Peer reviewed; Journal article, 2021)As the leading climate mode of wintertime climate variability over Europe, the North Atlantic Oscillation (NAO) has been extensively studied over the last decades. Recently, studies highlighted the state of the Eurasian ... -
Impact of solar irradiance and geomagnetic activity on polar NOx, ozone and temperature in WACCM simulations
Tartaglione, Nazario; Toniazzo, Thomas; Orsolini, Yvan J.; Otterå, Odd Helge (Peer reviewed; Journal article, 2020)The response of the atmosphere to solar irradiance and geomagnetic activity is analyzed in experiments with the Whole Atmosphere Community Climate Model (WACCM) under idealized forcings. Four experiments are carried out ... -
Impact of the major SSWs of February 2018 and January 2019 on the middle atmospheric nitric oxide abundance
Pérot, Kristell; Orsolini, Yvan J. (Peer reviewed; Journal article, 2021)The Arctic middle atmosphere was affected by major sudden stratospheric warmings (SSW) in February 2018 and January 2019, respectively. In this article, we report for the first time the impact of these two events on the ... -
Impact of the Pacific sector sea ice loss on the sudden stratospheric warming characteristics
Zhang, Jiarong; Orsolini, Yvan J.; Limpasuvan, Varavut; Ukita, Jinro (Peer reviewed; Journal article, 2022)The atmospheric response to Arctic sea ice loss remains a subject of much debate. Most studies have focused on the sea ice retreat in the Barents-Kara Seas and its troposphere-stratosphere influence. Here, we investigate ... -
Impacts of snow assimilation on seasonal snow and meteorological forecasts for the Tibetan Plateau
Li, Wei; Chen, Jie; Li, Lu; Orsolini, Yvan J.; Xiang, Yiheng; Senan, Retish; De Rosnay, Patricia (Peer reviewed; Journal article, 2022)The Tibetan Plateau (TP) contains the largest amount of snow outside the polar regions and is the source of many major rivers in Asia. An accurate long-range (i.e. seasonal) meteorological forecast is of great importance ...