Sökning: "Polar Vortex"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden Polar Vortex.

  1. 1. NH Planetary-Scale Circulation in Troposphere and Stratosphere: A Spectral and Dynamical Perspective

    Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Michael Konrad Schutte; [2023]
    Nyckelord :jet stream; Rossby waves; polar vortex; spectral analysis; dynamic systems theory; sudden stratospheric warmings; strong polar vortex events; jetström; Rossbyvågor; polär virvel; spektralanalys; dynamisk systemteori; plötsliga stratosfäriska uppvärmingar; starka polvortexhändelser;

    Sammanfattning : Dynamic Systems Theory (DST) and spectral analysis are employed to study the tropospheric jet stream and the stratospheric polar vortex. The objective is to investigate the relationship between Rossby wave activity and inverse persistence and dimensionality of geopotential height at 250 hPa and 10 hPa, as these two dynamical indicators are expected to show a characteristic behavior of Rossby wave harmonics. LÄS MER

  3. 2. Polar mesoscale cyclones in ERA5 and CARRA

    Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Zhaohui Cheng; [2023]
    Nyckelord :polar mesoscale cyclones; polar lows; ERA5; CARRA;

    Sammanfattning : Polar mesoscale cyclones (PMCs) are low-pressure systems that form in polar regions. Their small size and short lifespan pose challenges for coarse resolution models in capturing PMCs and their associated air-sea mass and energy transfer. To address the influence of resolution on PMCs, a comparison between a higher resolution dataset (CARRA with 2. LÄS MER

  4. 3. Large-Scale Atmospheric Drivers of Extreme Temperature Anomalies During Springtime in the Arctic

    Kandidat-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Linnea Barreng; [2022]
    Nyckelord :Meteorology; Temperature extremes; Arctic; Jet stream; Rossby waves; Spring; Meteorologi; Arktis; Extremväder; Jetström; Rossbyvågor; Vår;

    Sammanfattning : In this project warm extreme temperature events in the Arctic region during the spring months March, April and May were identified and analysed. In the analysis daily average NCEP reanalysis data from NOAA/OAR/ESRL PSL format was used. LÄS MER

  5. 4. Towards a Climatology of Polar Stratospheric Cloudsbased on observation with the IRF lidar

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Oliver Willbrink; [2021]
    Nyckelord :;

    Sammanfattning : The effect that the Polar stratospheric clouds (PSCs) have on the destruction of ozone in the polar vortex is well known. The study of these clouds is therefore highly relevant and important. A tool that can be used to gather parameters needed to describe the PSC is a lidar (Light Detection and Ranging). LÄS MER

  7. 5. Comparison of Coincident Ozone Profiles and the Role of the Polar Vortex in the Evolution of the Ozone Layer Above Kiruna, Sweden

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Kyriaki Blazaki; [2020]
    Nyckelord :;

    Sammanfattning : This study primarily focuses on comparing coincident ozone profiles, as well as investigating the relationship between the polar vortex and the changes in the ozone layer above Kiruna, Sweden (67.85N 20.22E) during the Arctic winters 2010/2011 and 2018/2019. LÄS MER