Observational validation of parameterized gravity waves from tropical convection in the Whole Atmosphere Community Climate Model (WACCM)

Alexander, M. Joan; Liu, Chuntao; Bacmeister, Julio T.; Bramberger, Martina; Hertzog, Albert; Richter, Jadwiga H.

doi:10.1002/essoar.10504474.1

Cited by 3 publications

(5 citation statements)

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“…So the east‐west asymmetry in the MF in Figure 6a appears to have the wrong sign. As pointed out in Alexander et al., (2021), other gravity wave components are probably needed to compensate for the eastward dominance in the current calculation, such as the stationary wave MF. Regarding the meridional MF, subtropical MF mostly points toward the equator.…”

Section: Resultsmentioning

confidence: 84%

“…In this study, we have designed a method to apply a physically‐based convective gravity wave source parameterization scheme (Beres et al., 2004, 2005) from the Whole Atmosphere Community Climate Model Version 6 (WACCM6, Gettelman et al., 2019) to the TRMM products. Using this method, we are able to estimate the MF within the limits of the gravity wave parameterization from TRMM convective gravity wave sources in tropics and subtropics (Alexander et al., 2021) and attempt to address the following questions: What is the geographical distribution of convective gravity wave sources? How much MF is contributed by convection over different regions in the tropics and subtropics? What are the different contributions of shallow or deep convection to the total MF in the lower stratosphere in tropics and subtropics?…”

Section: Introductionmentioning

confidence: 99%

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Using TRMM Latent Heat as a Source to Estimate Convection Induced Gravity Wave Momentum Flux in the Lower Stratosphere

et al. 2022

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Using TRMM Latent Heat as a Source to Estimate Convection Induced Gravity Wave Momentum Flux in the Lower Stratosphere

et al. 2022

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“…In this study, both unconditional and conditional monthly LH data were used to analyze both the occurrence frequency and monthly intensity of LH. In addition, the two types of monthly LH data sets were also taken in the form of zonally and regionally averaged profiles to account for the aforementioned uncertainties stemming from the temporal gap between the water phase change process and the detection of hydrometeors in the individual heating profiles from the SLH data (Alexander et al., 2021; Liu et al., 2015).…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, satellite LH products are used to describe the latent heat structures of convective systems in the Madden–Julian oscillation (MJO) cycle (Jiang et al., 2011; Lau & Wu, 2010), tropical cyclones (Zagrodnik & Jiang, 2014), and monsoon (Krishnamurti et al., 2012; Zuluga et al., 2010). Recently, it has been confirmed that satellite LH data improve gravity wave parameterization to calculate reasonable gravity waves, which may help reproduce a more realistic QBO (Alexander et al., 2021). Despite these benefits, satellite LH products have not yet been used to explore the signatures of tropical convection during the 2015/2016 QBO disruption.…”

Section: Introductionmentioning

confidence: 94%

Differences in Satellite‐Based Latent Heating Profiles Between the 2015/2016 Disruption and Westerly Phase of the Quasi‐Biennial Oscillation

et al. 2022

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Latent heating (LH) profiles from the Tropical Rainfall Measuring Mission (TRMM) and the Global Precipitation Measurement mission (GPM) were employed to examine the LH distribution during the quasi‐biennial oscillation (QBO) disruption in the 2015/2016 Northern Hemispheric (NH) winter. We used the LH anomalies from the observation era climatology to compensate for the discontinuity between the TRMM and GPM LH. The difference in the LH anomalies (LHd) between the 2015/2016 winter and the typical winter coinciding with the westerly QBO phase revealed that deeper convective systems in the 2015/2016 winter shifted to the equator, releasing more latent heat relative to the convective systems in the winters coinciding with the westerly QBO phase. Comparison of the LHds calculated for each winter of 1998–2019 shows that the changes in the convective systems in the 2015/2016 winter were statistically exceptional among the changes in other winters. Inside the convective systems, stronger latent heat release and more frequent occurrences of deep convective and deep‐stratiform rain cells made up the total LHd during the 2015/2016 winter. Specifically, convective rain cells mainly derived the LHd of the convective systems in the 2015/2016 winter, except in February 2016. The results suggest that the LH increase from the typical winter with the westerly QBO phase may be considered an unusual equatorial wave source during the 2015/2016 QBO disruption. The signatures of the LHd profiles in the 10°S–10°N zonal band are sourced from the abnormal convective systems that were shifted from the western Pacific to the central‐to‐eastern Pacific.

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“…Finally, it is worth noticing that the shortcomings we try to deal with are considered priorities in the community (see discussion about low phase speed waves in Alexander et al. (2021)), but are not the only ones. Some authors place more emphasis on including three‐dimensional propagation of gravity waves in parameterizations (e.g., Amemiya & Sato, 2016; Muraschko et al., 2015; Ribstein & Achatz, 2016).…”

Section: Introductionmentioning

confidence: 99%

Can We Improve the Realism of Gravity Wave Parameterizations by Imposing Sources at All Altitudes in the Atmosphere?

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et al. 2022

J Adv Model Earth Syst

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Their amplitude grows as they propagate vertically and they impact the middle atmosphere circulation when they break and/or dissipate, even if they have relatively small amplitudes at the source level. The spatial scales of GWs are generally too small to be resolved by general circulation models (GCMs), and the generation, propagation and dissipation of these waves need to be parameterized for GCMs to produce a reasonable circulation. Such parameterizations were first introduced in the 1980s in models with a barely resolved stratosphere, and only high-amplitude orographically forced GWs were needed to be taken into account (Palmer et al., 1986). Nowadays many models resolve the middle atmosphere, requiring the parameterization of the effects of smaller-amplitude, non-orographic gravity waves (Manzini et al., 1997).One way to parameterize non-orographic GWs consists in using the observational evidence of "universal" spectra built over a large number of realizations of GW fluctuations of vertical wind and temperature in the middle atmosphere, which shape is derived from radiosondes and satellite data (e.g., Cot, 2001;Zhao et al., 2017). These spectra are numerically robust (Brethouwer et al., 2007;Lindborg, 2006), and various theories have been developed to explain them. Some involve wave breaking (e.g., Dewan & Good, 1986), other include nonlinear

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Observational validation of parameterized gravity waves from tropical convection in the Whole Atmosphere Community Climate Model (WACCM)

Cited by 3 publications

References 0 publications

Using TRMM Latent Heat as a Source to Estimate Convection Induced Gravity Wave Momentum Flux in the Lower Stratosphere

Using TRMM Latent Heat as a Source to Estimate Convection Induced Gravity Wave Momentum Flux in the Lower Stratosphere

Differences in Satellite‐Based Latent Heating Profiles Between the 2015/2016 Disruption and Westerly Phase of the Quasi‐Biennial Oscillation

Can We Improve the Realism of Gravity Wave Parameterizations by Imposing Sources at All Altitudes in the Atmosphere?

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