Long-term high-resolution temperature data of the Compact Rayleigh Autonomous Lidar (CORAL) is used to evaluate temperature and gravity wave (GW) activity in ECMWF Integrated Forecasting System (IFS) over Río Grande (53.79°S, 67.75°W), which is a hot spot of stratospheric GWs in winter. Seasonal and altitudinal variations of the temperature differences between the IFS and lidar are studied for 2018 with a uniform IFS version. Moreover, interannual variations are considered taking into account updated IFS versions. We find monthly mean temperature differences <2 K at 20–40 km altitude. At 45–55 km, the differences are smaller than 4 K during summer. The largest differences are found during winter (4 K in May 2018 and −10 K in August 2018, July 2019 and 2020). The width of the difference distribution (15th/85th percentiles), the root mean square error, and maximum differences between instantaneous individual profiles are also larger during winter (>±10 K) and increase with altitude. We relate this seasonal variability to middle atmosphere GW activity. In the upper stratosphere and lower mesosphere, the observed temperature differences result from both GW amplitude and phase differences. The IFS captures the seasonal cycle of GW potential energy (Ep) well, but underestimates Ep in the middle atmosphere. Experimental IFS simulations without damping by the model sponge for May and August 2018 show an increase in the monthly mean Ep above 45 km from only ≈10% of the Ep derived from the lidar measurements to 26% and 42%, respectively. GWs not resolved in the IFS are likely explaining the remaining underestimation of the Ep.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Gravity-Wave-Driven Seasonal Variability of Temperature Differences Between ECMWF IFS and Rayleigh Lidar Measurements in the Lee of the Southern Andes


    Beteiligte:
    Gisinger, Sonja (Autor:in) / Polichtchouk, Inna (Autor:in) / Dörnbrack, Andreas (Autor:in) / Reichert, Robert (Autor:in) / Kaifler, Bernd (Autor:in) / Kaifler, Natalie (Autor:in) / Rapp, Markus (Autor:in) / Sandu, Irina (Autor:in)


    Erscheinungsdatum :

    2022-06-26



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Comparing ECMWF high resolution analyses to lidar temperature measurements in the middle atmosphere

    Ehard, Benedikt / Malardel, Sylvie / Dörnbrack, Andreas et al. | Deutsches Zentrum für Luft- und Raumfahrt (DLR) | 2018

    Freier Zugriff

    High-Cadence Lidar Observations of Middle Atmospheric Temperature and Gravity Waves at the Southern Andes Hot Spot

    Reichert, Robert / Kaifler, Bernd / Kaifler, Natalie et al. | Deutsches Zentrum für Luft- und Raumfahrt (DLR) | 2021

    Freier Zugriff

    Waves and clouds in the atmosphere above the southern Andes as seen by the CORAL Rayleigh lidar

    Kaifler, Natalie / Kaifler, Bernd / Dörnbrack, Andreas et al. | Deutsches Zentrum für Luft- und Raumfahrt (DLR) | 2023

    Freier Zugriff

    An intercomparison of stratospheric gravity wave potential energy densities from METOP GPS radio occultation measurements and ECMWF model data

    Rapp, Markus / Dörnbrack, Andreas / Kaifler, Bernd | Deutsches Zentrum für Luft- und Raumfahrt (DLR) | 2018

    Freier Zugriff

    Lidar Measurements for Deriving Atmospheric Temperature by Utilizing Rayleigh-Brillouin Scattering

    Witschas, B. / Reitebuch, O. / Lemmerz, C. et al. | British Library Conference Proceedings | 2013