Comparative study between ground-based observations and NAVGEM-HA analysis data in the mesosphere and lower thermosphere region

Stober, Gunter; Baumgarten, Kathrin; McCormack, J. P.; Brown, Peter; Czarnecki, Jerry

doi:10.5194/acp-20-11979-2020

Cited by 40 publications

(68 citation statements)

References 93 publications

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“…The DOY 265 amplitude peak appears to be an enhancement superimposed on the broad wintertime maximum. There are a number of mechanisms that can excite a time-localized forcing of TW3, such as non-linear wave-wave interactions and diurnal tide and gravity wave interactions (Teitelbaum et al, 1989;Miyahara and Forbes, 1991). Whether conditions are favorable for any such mechanisms to come into effect around DOY 265 remains to be examined.…”

Section: Discussionmentioning

confidence: 99%

Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars

et al. 2020

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Abstract. This study uses hourly meteor wind measurements from a longitudinal array of 10 high-latitude SuperDARN high-frequency (HF) radars to isolate the migrating diurnal, semidiurnal, and terdiurnal tides at mesosphere–lower-thermosphere (MLT) altitudes. The planetary-scale array of radars covers 180∘ of longitude, with 8 out of 10 radars being in near-continuous operation since the year 2000. Time series spanning 16 years of tidal amplitudes and phases in both zonal and meridional wind are presented, along with their respective annual climatologies. The method to isolate the migrating tides from SuperDARN meteor winds is validated using 2 years of winds from a high-altitude meteorological analysis system. The validation steps demonstrate that, given the geographical spread of the radar stations, the derived tidal modes are most closely representative of the migrating tides at 60∘ N. Some of the main characteristics of the observed migrating tides are that the semidiurnal tide shows sharp phase jumps around the equinoxes and peak amplitudes during early fall and that the terdiurnal tide shows a pronounced secondary amplitude peak around day of year (DOY) 265. In addition, the diurnal tide is found to show a bi-modal circular polarization phase relation between summer and winter.

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Section: Discussionmentioning

confidence: 99%

Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars

et al. 2020

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“…The resulting analyses near the model top are heavily influenced by this imposed diffusion. Therefore, in this study we limit our focus to altitudes below 95 km geometric altitude, where 200 previous validation studies (e.g., McCormack et al, 2017;Dhadly et al, 2018;Stober et al, 2020) have shown NAVGEM-HA to produce reliable results. The NAVGEM-HA system produces analyses every 6 hours, and these fields are supplemented by 3-hourly forecast fields produced by the system as part of the 4DVAR framework, providing an effective 3-hourly sampling rate for the extraction of tidal signatures in the horizontal wind and temperature fields.…”

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confidence: 99%

Intercomparison of Middle Atmospheric Meteorological Analyses for the Northern Hemisphere Winter 2009–2010

McCormack

Harvey

Pedatella

et al. 2021

Preprint

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Abstract. Detailed meteorological analyses based on observations extending through the middle atmosphere (~15–100 km altitude) can provide key information to whole atmosphere modelling systems regarding the physical mechanisms linking day-to-day changes in ionospheric electron density to meteorological variability near the Earth’s surface. It is currently unclear how middle atmosphere analyses produced by various research groups consistently represent the wide range of proposed linking mechanisms involving migrating and non-migrating tides, planetary waves, gravity waves, and their impact on the zonal mean state in the mesosphere and lower thermosphere (MLT) region. To begin to address this issue, we present the first intercomparison among four such analyses, JAGUAR-DAS, MERRA-2, NAVGEM-HA, and WACCMX+DART, focusing on the Northern Hemisphere (NH) 2009–2010 winter that includes a major stratospheric sudden warming (SSW) in late January. This intercomparison examines the altitude, latitude, and time dependences of zonal mean zonal winds and temperatures among these four analyses over the 1 December 2009–31 March 2010 period, as well as latitude and altitude dependences of monthly mean amplitudes of the diurnal and semidiurnal migrating solar tides, the eastward propagating diurnal zonal wave number 3 nonmigrating tide, and traveling planetary waves associated with the quasi-5 day and quasi-2-day Rossby modes. Our results show generally good agreement among the four analyses up to the stratopause (~50 km altitude). Large discrepancies begin to emerge in the MLT owing to (1) differences in the types of satellite data assimilated by each system and (2) differences in the details of the global atmospheric models used by each analysis system. The results of this intercomparison provide initial estimates of uncertainty in analyses commonly used to constrain middle atmospheric meteorological variability in whole atmosphere model simulations.

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“…At mid-and polar latitudes non-migrating tides can be generated by various processes such as latent heat release, nonlinear interactions with stationary planetary waves (Yamashita et al, 2002;Smith et al, 2007;Murphy et al, 2009;Miyoshi et al, 2017) and other tidal modes, variations in the mean background wind and temperature field, and gravity wave breaking or dissipation regions (Fritts et al, 2006). Furthermore, there were some studies investigating SSW as a potential cause to excite the westward propagating semidiurnal tides with wavenumbers 1 and 3 (Du et al, 2007;Liu et al, 2010b;Stober et al, 2020a).…”

Section: Discussionmentioning

confidence: 99%

“…Atmospheric mean winds and tides are analyzed using the ASF, which is described in more detail in Baumgarten and Stober (2019) and Stober et al (2020a) and was already applied in several studies (Stober et al, 2017;Pokhotelov et al, 2018;Wilhelm et al, 2019;Stober et al, 2020b) to decompose MR winds in daily mean winds, diurnal and semidiurnal tides for the zonal and meridional components, respectively. The technique is implemented based on least square fits with full error propagation, which permits to apply the algorithm to unevenly sampled data with data gaps.…”

Section: Data Analysis Of Mean Winds and Atmospheric Tidesmentioning

confidence: 99%

“…Therefore, we analyze the GAIA, WACCM-X(SD), and UA-ICON climate model runs and compile mean wind and tidal climatologies for the same periods as the available MR measurements applying an Adaptive Spectral Filter (ASF). The ASF allows a harmonized and unified methodology to decomposing time series into mean winds and tidal information for both data sets (Baumgarten and Stober, 2019;Stober et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

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Interhemispheric differences of mesosphere/lower thermosphere winds and tides investigated from three whole atmosphere models and meteor radar observations

Stober¹,

Kuchař²,

Pokhotelov³

et al. 2021

Preprint

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Abstract. Long-term and continuous observations of mesospheric/lower thermospheric winds are rare, but they are important to investigate climatological changes at these altitudes on time scales of several years, covering a solar cycle and longer. Such long time series are a natural heritage of the mesosphere/lower thermosphere climate, and they are valuable to compare climate models or long term runs of general circulation models (GCMs). Here we present a climatological comparison of wind observations from six meteor radars at two conjugate latitudes to validate the corresponding mean winds and atmospheric diurnal and semidiurnal tides from three GCMs, namely Ground-to-Topside Model of Atmosphere and Ionosphere for Aeronomy (GAIA), Whole Atmosphere Community Climate Model Extension (Specified Dynamics) (WACCM-X(SD)) and Upper Atmosphere ICOsahedral Non-hydrostatic (UA-ICON) model. Our results indicate that there are interhemispheric differences in the seasonal characteristics of the diurnal and semidiurnal tide. There also are some differences in the mean wind climatologies of the models and the observations. Our results indicate that GAIA shows a reasonable agreement with the meteor radar observations during the winter season, whereas WACCM-X(SD) shows a better agreement with the radars for the hemispheric zonal summer wind reversal, which is more consistent with the meteor radar observations. The free running UA-ICON tends to show similar winds and tides compared to WACCM-X(SD).

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Comparative study between ground-based observations and NAVGEM-HA analysis data in the mesosphere and lower thermosphere region

Cited by 40 publications

References 93 publications

Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars

Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars

Intercomparison of Middle Atmospheric Meteorological Analyses for the Northern Hemisphere Winter 2009–2010

Interhemispheric differences of mesosphere/lower thermosphere winds and tides investigated from three whole atmosphere models and meteor radar observations

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