Momentum budget of the migrating diurnal tide in the Whole Atmosphere Community Climate Model at vernal equinox

Lu, Xian; Liu, H.-L.; Liu, A. Z.; Yue, Jia; McInerney, Joseph; Li, Z.

doi:10.1029/2011jd017089

Cited by 29 publications

(42 citation statements)

References 57 publications

(101 reference statements)

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“…CESM1(WACCM) has been used to simulate the circulation, gravity waves and atmospheric composition changes due to the chemistry and photochemistry in the lower, middle and upper atmosphere (Pedatella et al 2014;Pedatella and Liu 2013;Lu et al 2012;Tan et al 2012a, b, c;Davis et al 2013;Smith et al 2012). Furthermore, it is fully coupled to the land and ocean models (Vertenstein et al 2012).…”

Section: Model Descriptionmentioning

confidence: 99%

Characterising the three-dimensional ozone distribution of a tidally locked Earth-like planet

Proedrou

Hocke

2016

Earth Planet Sp

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We simulate the 3D ozone distribution of a tidally locked Earth-like exoplanet using the high-resolution, 3D chemistryclimate model CESM1(WACCM) and study how the ozone layer of a tidally locked Earth (TLE) (� TLE = 1/365 days) differs from that of our present-day Earth (PDE) (� PDE = 1/1 day). The middle atmosphere reaches a steady state asymptotically within the first 80 days of the simulation. An upwelling, centred on the subsolar point, is present on the day side while a downwelling, centred on the antisolar point, is present on the night side. In the mesosphere, we find similar global ozone distributions for the TLE and the PDE, with decreased ozone on the day side and enhanced ozone on the night side. In the lower mesosphere, a jet stream transitions into a large-scale vortex around a low-pressure system, located at low latitudes of the TLE night side. In the middle stratosphere, the concentration of odd oxygen is approximately equal to that of the ozone [(O x ) ≈ (O 3 )]. At these altitudes, the lifetime of odd oxygen is ∼16 h and the transport processes significantly contribute to the global distribution of stratospheric ozone. Compared to the PDE, where the strong Coriolis force acts as a mixing barrier between low and high latitudes, the transport processes of the TLE are governed by jet streams variable in the zonal and meridional directions. In the middle stratosphere of the TLE, we find high ozone values on the day side, due to the increased production of atomic oxygen on the day side, where it immediately recombines with molecular oxygen to form ozone. In contrast, the ozone is depleted on the night side, due to changes in the solar radiation distribution and the presence of a downwelling. As a result of the reduced Coriolis force, the tropical and extratropical air masses are well mixed and the global temperature distribution of the TLE stratosphere has smaller horizontal gradients than the PDE. Compared to the PDE, the total ozone column global mean is reduced by ∼19.3 %. The day side and the night side total ozone column means are reduced by 23.21 and 15.52 %, respectively. Finally, we present the total ozone column (TOC) maps as viewed by a remote observer for four phases of the TLE during its revolution around the star. The mean TOC values of the four phases of the TLE vary by up to 23 %.

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Section: Model Descriptionmentioning

confidence: 99%

Characterising the three-dimensional ozone distribution of a tidally locked Earth-like planet

Proedrou

Hocke

2016

Earth Planet Sp

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“…The climatology of both migrating and nonmigrating diurnal tides has been revealed by satellite temperature/wind observations such as the High Resolution Doppler Interferometer (HRDI)/ Wind Imaging Interferometer (WINDII)/Microwave Limb Sounder (MLS) on board the Upper Atmosphere Research Satellite (UARS) (Hays and Wu 1994;McLandress et al 1996;Khattatov et al 1996;Talaat and Lieberman 1999;Ward et al 1999;Forbes et al 2003a, b;Manson et al 2004;Huang and Reber 2004;Forbes and Wu 2006), the TIMED Doppler Interferometer (TIDI)/Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite Zhang et al 2006;Oberheide et al 2006;Wu et al 2008a, b;Pancheva et al 2009;Xu et al 2009b;Sakazaki et al 2012) in the MLT region, and the CHAllenging Minisatellite Payload (CHAMP) radio occultation (RO) (Zeng et al 2008;Pirscher et al 2010;Xie et al 2010) in the upper troposphere and lower stratosphere (UTLS) region. Ground-based instruments such as radars and lidars have also been used routinely for diurnal tide observations in the range of 80 and 120 km (Fritts and Isler 1994;Vincent et al 1988Vincent et al , 1998Yi 2001;Manson et al 2002;She et al 2004;Zhang et al 2004;Yuan et al 2006Yuan et al , 2008Lu et al 2012;Huang et al 2012Huang et al , 2013aGong et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Climatology of the diurnal tides from eCMAM30 (1979 to 2010) and its comparison with SABER

Gan

Ward

et al. 2014

Earth Planet Space

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The extended Canadian Middle Atmosphere Model (eCMAM) was recently run in a nudged mode using reanalysis data from the ground to 1 hPa for the period of January 1979 to June 2010 (hence the name eCMAM30). In this paper, eCMAM30 temperature is used to examine the background mean temperature, the spectrum of the diurnal tides, and the climatology of the migrating diurnal tide Dw1 and three nonmigrating diurnal tides De3, Dw2, and Ds0 in the stratosphere, mesosphere, and lower thermosphere. The model results are then compared to the diurnal tidal climatology derived from Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) observations between 40 to 110 km and 50°S to 50°N from January 2002 to December 2013. The model reproduces the latitudinal background mean temperature gradients well except that the cold mesopause temperature in eCMAM30 is 10 to 20 K colder than SABER. The diurnal tidal spectra and their relative strengths compare very well between eCMAM30 and SABER. The altitude-latitude structures for the four diurnal tidal components (Dw1, De3, Dw2, and Ds0) from the two datasets are also in very good agreement even for structures in the stratosphere with a weaker amplitude. The largest discrepancy between the model and SABER is associated with the seasonal variation of De3. In addition to the Northern Hemisphere (NH) summer maximum, a secondary maximum occurs during NH winter (December-February) in the model but is absent in SABER. The seasonal variations of the other three diurnal tidal components are in good agreement. Interannual time series of Dw1 and De3 from both eCMAM30 and SABER reveal variability with a period of 25 to 26 months, which indicates the modulation of the diurnal tides by the stratospheric quasi-biennial oscillation (QBO).

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“…Of course, we have to bear in mind that we are considering a single month only and that the temporal variability of the OH emission layer is also affecting our weighted O concentrations. Moreover, following the study of Lu et al (2012) the magnitude of the tidal amplitude seems to be slightly underestimated by WACCM4. Despite this slight underestimation, the tidal signatures in the OH profile weighted O as well as the OH concentrations of our monthly case example show consistent characteristics with previous observations and should therefore serve as a plausible testing ground for the initial hypothesis on the collisional quenching.…”

Section: Simulated Tidal Signatures In Oh and O: A Monthly Case Examplementioning

confidence: 99%

On the impact of the temporal variability of the collisional quenching process on the mesospheric OH emission layer: a study based on SD-WACCM4 and SABER

Kowalewski

Savigny²,

Palm³

et al. 2014

Atmos. Chem. Phys.

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Abstract. The mesospheric OH Meinel emissions are subject of many theoretical and observational studies devoted to this part of the atmosphere. Depending on the initial vibrational level of excitation the altitude of the considered OH Meinel emission is systematically shifted, which has important implications for the intercomparison of different studies considering different transition bands. Previous model studies suggest that these vertical shifts are essentially caused by the process of collisional quenching with atomic oxygen. Following this hypothesis, a recent study found experimental evidence of a coherent seasonality at tropical latitudes between vertical shifts of different OH Meinel bands and changes in atomic oxygen concentrations. Despite the consistent finding of the above mentioned hypothesis, it cannot be excluded that the actual temporal variability of the vertical shifts between different OH Meinel bands may in addition be controlled or even dominated by other processes. It remains an open question whether the observed temporal evolution is indeed mainly controlled by the modulation of the collisional quenching process with atomic oxygen. By means of a sensitivity study which employs a quenching model to simulations made with the SD-WACCM4 chemistry climate model, we aim at assessing this question. From this study we find that the observed seasonality of vertical OH Meinel shifts is only partially controlled by temporal changes in atomic oxygen concentrations, while molecular oxygen has another noticeable impact on the vertical OH Meinel shifts. This in particular becomes evident for the diurnal variability of vertical OH Meinel shifts, which reveal only a poor correlation with the atomic oxygen species. Furthermore, changes in the H + O 3 source gases provide another mechanism that can potentially affect the diurnal variability in addition. By comparison with limb radiance observations from the SABER/TIMED satellite this provides an explanation for the less evident diurnal response between changes in O concentrations and vertical OH Meinel shifts. On the other hand, at seasonal timescales the coherency between both quantities is again evident in SABER/TIMED but less pronounced compared to our model simulations.

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Momentum budget of the migrating diurnal tide in the Whole Atmosphere Community Climate Model at vernal equinox

Cited by 29 publications

References 57 publications

Characterising the three-dimensional ozone distribution of a tidally locked Earth-like planet

Characterising the three-dimensional ozone distribution of a tidally locked Earth-like planet

Climatology of the diurnal tides from eCMAM30 (1979 to 2010) and its comparison with SABER

On the impact of the temporal variability of the collisional quenching process on the mesospheric OH emission layer: a study based on SD-WACCM4 and SABER

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