Petr Šácha
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View article: Climatology, long-term variability and trend of resolved gravity wave drag in the stratosphere revealed by ERA5
Climatology, long-term variability and trend of resolved gravity wave drag in the stratosphere revealed by ERA5 Open
Internal gravity waves have well-known importance for atmospheric dynamics, transport and coupling between atmospheric layers, and their parameterized forcing affects the circulation in climate models, especially in the stratosphere. The s…
View article: CMIP7 Data Request: Atmosphere Priorities and Opportunities
CMIP7 Data Request: Atmosphere Priorities and Opportunities Open
This paper presents a comprehensive overview of the Coupled Model Intercomparison Project Phase 7 (CMIP7) request for data unlocking key research avenues in atmospheric science and provides justification for the resources needed to produce…
View article: Climatology, long-term variability and trend of resolved gravity wave drag in the stratosphere revealed by ERA 5
Climatology, long-term variability and trend of resolved gravity wave drag in the stratosphere revealed by ERA 5 Open
Internal gravity waves have a well-known importance for atmospheric dynamics, transport and coupling between atmospheric layers and their parameterized forcing affects the circulation in climate models, especially in the stratosphere. The …
View article: The Need for Better Monitoring of Climate Change in the Middle and Upper Atmosphere
The Need for Better Monitoring of Climate Change in the Middle and Upper Atmosphere Open
Anthropogenic greenhouse gas emissions significantly impact the middle and upper atmosphere. They cause cooling and thermal shrinking and affect the atmospheric structure. Atmospheric contraction results in changes in key atmospheric featu…
View article: Advective Transport Between the Stratosphere and Mesosphere
Advective Transport Between the Stratosphere and Mesosphere Open
The Brewer‐Dobson circulation (BDC) characterizes the large‐scale meridional overturning mass circulation influencing the composition of the whole middle atmosphere. The BDC consists of two separate parts—a shallow branch in the lower stra…
View article: Climatology of the terms and variables of transformed Eulerian-mean (TEM) equations from multiple reanalyses: MERRA-2, JRA-55, ERA-Interim, and CFSR
Climatology of the terms and variables of transformed Eulerian-mean (TEM) equations from multiple reanalyses: MERRA-2, JRA-55, ERA-Interim, and CFSR Open
A 30-year (1980–2010) climatology of the major variables and terms of the transformed Eulerian-mean (TEM) momentum and thermodynamic equations is constructed by using four global atmospheric reanalyses: the Modern-Era Retrospective analysi…
View article: Disentangling the Advective Brewer‐Dobson Circulation Change
Disentangling the Advective Brewer‐Dobson Circulation Change Open
Climate models robustly project acceleration of the Brewer‐Dobson circulation (BDC) in response to climate change. However, the BDC trends simulated by comprehensive models are poorly constrained by observations, which cannot even determin…
View article: Advective transport between the stratosphere and mesosphere
Advective transport between the stratosphere and mesosphere Open
The Brewer-Dobson circulation (BDC) characterizes the large-scale meridional overturning mass circulation influencing the composition of the whole middle atmosphere. The BDC consists of two separate parts - a shallow branch in the lower st…
View article: Comparison of different stratospheric parameters from reanalysis and satellite data
Comparison of different stratospheric parameters from reanalysis and satellite data Open
In this study we compare various stratospheric parameters obtained from reanalysis and satellite data. The data from ERA5.1, MERRA2, JRA55, and JRA3Q reanalysis, as well as from the MLS and SABER satellite instruments are used to assess th…
View article: Parameterized orographic gravity wave drag controls extratropical stratospheric dynamics in CMIP6 models.
Parameterized orographic gravity wave drag controls extratropical stratospheric dynamics in CMIP6 models. Open
Orographic gravity waves (OGWs) are an important mechanism for coupling of the free atmosphere with the surface, mediating the momentum and energy transport and influencing the dynamics and circulation especially in the stratosphere and ab…
View article: Overview of the impact of climate change on the structure and dynamical properties of the stratosphere
Overview of the impact of climate change on the structure and dynamical properties of the stratosphere Open
Climate change has a significant impact on the structure and properties of the Earth's atmosphere above the tropopause. The most noticeable effects include a decrease in temperature and density. However, it is difficult to establish trends…
View article: Comment on egusphere-2023-2917
Comment on egusphere-2023-2917 Open
Abstract. A 30-year (1980–2010) climatology of the major variables and terms of the transformed Eulerian-mean (TEM) momentum and thermodynamic equations is constructed by using four global atmospheric reanalyses, MERRA-2, …
View article: Parameterized orographic gravity wave drag and dynamical effects in CMIP6 models
Parameterized orographic gravity wave drag and dynamical effects in CMIP6 models Open
Orographic gravity waves (OGWs) are an important mechanism for coupling of the free atmosphere with the surface, mediating the momentum and energy transport and influencing the dynamics and circulation especially in the middle-atmosphere. …
View article: Climatology of the terms and variables of transformed Eulerian-mean (TEM) equations from multiple reanalyses: MERRA-2, JRA-55, ERA-Interim, and CFSR
Climatology of the terms and variables of transformed Eulerian-mean (TEM) equations from multiple reanalyses: MERRA-2, JRA-55, ERA-Interim, and CFSR Open
A 30-year (1980–2010) climatology of the major variables and terms of the transformed Eulerian-mean (TEM) momentum and thermodynamic equations is constructed by using four global atmospheric reanalyses, MERRA-2, JRA-55, ERA-Interim, and CF…
View article: Unravelling the kinematics of the Brewer-Dobson circulation change
Unravelling the kinematics of the Brewer-Dobson circulation change Open
Climate models robustly project acceleration of the Brewer-Dobson circulation (BDC) in response to climate change. However, the BDC trends derived from comprehensive models do not fully match observations. Additionally, the changing struct…
View article: The Climatology of Elevated Stratopause Events in the UA‐ICON Model and the Contribution of Gravity Waves
The Climatology of Elevated Stratopause Events in the UA‐ICON Model and the Contribution of Gravity Waves Open
The climatologies of the stratopause height and temperature in the UA‐ICON model are examined by comparing them to 17‐years (2005–2021) of Microwave Limb Sounder (MLS) observations. In addition, the elevated stratopause (ES) event occurren…
View article: Representation, evolution and validation of the stratopause and stratospheric contraction in reanalyses data
Representation, evolution and validation of the stratopause and stratospheric contraction in reanalyses data Open
Recent work using models from the Chemistry-Climate Model Initiative shows that the stratopause is descending and that the stratosphere has contracted substantially over the last decades, being the increasing concentrations of greenhouse g…
View article: The impact of structural changes in the middle atmosphere on the Brewer-Dobson circulation
The impact of structural changes in the middle atmosphere on the Brewer-Dobson circulation Open
Changes in atmospheric composition affect surface climate and alter atmospheric structure, dynamics, and transport, which in turn further affect the composition. In the middle atmosphere, the composition is influenced by the Brewer-Dobson …
View article: Quantification of gravity wave drag in ERA5 reanalysis
Quantification of gravity wave drag in ERA5 reanalysis Open
Internal gravity waves (GWs) are a ubiquitous component of atmospheric dynamics, propagating both horizontally and vertically through the atmosphere, interacting with other flow components and affecting regional to large-scale dynamics. Du…
View article: Link between orographic gravity wave parameterizations and resolved dynamics in CMIP6 models.
Link between orographic gravity wave parameterizations and resolved dynamics in CMIP6 models. Open
Internal gravity waves (GWs) have an important influence on the atmospheric energy transport and momentum budget. Consideration of the GWs – related processes is necessary in modelling and conceptual models of the atmosphere. GWs cov…
View article: Unravelling climate impacts of atmospheric internal gravity waves.
Unravelling climate impacts of atmospheric internal gravity waves. Open
Unresolved processes in climate models present a major source of uncertainty in future climate projections.In this talk we will show the first results and introduce a newly founded five year project, which aims to re-examine the climate im…
View article: On the impact of Himalaya-induced gravity waves on the polar vortex, Rossby wave activity and ozone
On the impact of Himalaya-induced gravity waves on the polar vortex, Rossby wave activity and ozone Open
The instability of the Northern Hemisphere polar vortex is mainly caused by the breaking of planetary-scale (Rossby) waves (RWs). However, gravity waves (GWs) may also play an important role in polar vortex preconditioning before breakdown…
View article: Corrigendum to: Overestimated acceleration of the advective <scp>Brewer‐Dobson</scp> circulation due to stratospheric cooling
Corrigendum to: Overestimated acceleration of the advective <span>Brewer‐Dobson</span> circulation due to stratospheric cooling Open
Corrigendum The original version of the above paper, published in Quarterly Journal of the Royal Meteorological Society, 2020, 146:3850–3864 (DOI:10.1002/qj.3876), contains an error in the notation of the formulae for w ¯ and w ¯ * in Equa…
View article: Impact of Increased Vertical Resolution in WACCM on the Climatology of Major Sudden Stratospheric Warmings
Impact of Increased Vertical Resolution in WACCM on the Climatology of Major Sudden Stratospheric Warmings Open
Sudden stratospheric warmings (SSWs) are a major mode of variability of the winter stratosphere. In recent years, climate models have improved their ability to simulate SSWs. However, the representation of the frequency and temporal distri…
View article: Detection of internal gravity waves by high-pass filtering
Detection of internal gravity waves by high-pass filtering Open
<p>Terrestrial atmosphere supports propagation of various wave types. An important component of the dynamics especially in the middle atmosphere are the internal gravity waves (GWs) that are incessantly being generated from initial p…
View article: Is the Brewer-Dobson circulation increasing or moving upward? A definitive answer.
Is the Brewer-Dobson circulation increasing or moving upward? A definitive answer. Open
<p>The meridional overturning mass circulation in the middle atmosphere, i.e. the Brewer- Dobson circulation (BDC), was first discovered before decades based on the distribution of trace gases and a basic analytical concept of BDC ha…
View article: Observed and Modeled Mountain Waves from the Surface to the Mesosphere near the Drake Passage
Observed and Modeled Mountain Waves from the Surface to the Mesosphere near the Drake Passage Open
Four state-of-the-science numerical weather prediction (NWP) models were used to perform mountain wave (MW)-resolving hindcasts over the Drake Passage of a 10-day period in 2010 with numerous observed MW cases. The Integrated Forecast Syst…
View article: Analysis of interaction between parameterized orographic gravity wave drag and resolved dynamics in CMAM.
Analysis of interaction between parameterized orographic gravity wave drag and resolved dynamics in CMAM. Open
<div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p>In the extratropical atmosphere, Rossby waves (RWs) and internal gravity waves (GWs) propaga…
View article: Sensitivity of the middle and upper atmospheric dynamics to the modification of the gravity wave drag parameterization in ICON model
Sensitivity of the middle and upper atmospheric dynamics to the modification of the gravity wave drag parameterization in ICON model Open
<p>The gravity waves play a crucial role in driving and shaping the middle atmospheric circulation. The Upper-Atmospheric extension of the ICOsahedral Non-hydrostatic (UA-ICON) general circulation model was recently developed with sa…
View article: Parameterized orographic gravity wave drag in CMIP6 models, distribution, variability, trends and intermodel spread
Parameterized orographic gravity wave drag in CMIP6 models, distribution, variability, trends and intermodel spread Open
<p>Internal gravity waves (GWs) are a naturally occurring and intermittent phenomenon in the atmosphere. GWs can propagate horizontally and vertically and are important for atmospheric dynamics, influencing the atmospheric thermal an…