Haruka Okui
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View article: The Mechanism of Interhemispheric Coupling Revealed by a Gravity Wave‐Permitting General Circulation Model
The Mechanism of Interhemispheric Coupling Revealed by a Gravity Wave‐Permitting General Circulation Model Open
Interhemispheric coupling (IHC) is the positive correlation between temperatures in the polar winter stratosphere and the polar summer upper mesosphere and the lower thermosphere. Over the past two decades, several mechanisms have been pro…
View article: A Convolutional Neural Network for the Detection of Gravity Waves in Satellite Observations and Numerical Simulations
A Convolutional Neural Network for the Detection of Gravity Waves in Satellite Observations and Numerical Simulations Open
Comparisons between observed and model‐resolved gravity waves (GWs) are crucial for evaluating general circulation model (GCM) simulation accuracy and understanding wave characteristics. However, observational noise often obscures waves, c…
View article: Stratospheric Gravity waves in AIRS observations and high-resolution models
Stratospheric Gravity waves in AIRS observations and high-resolution models Open
Atmospheric gravity waves vary hugely in scale; with horizontal wavelengths ranging from a few to thousands of km. Typically, gravity waves are smaller than model grid-size and as a result, their effects are parametrised instead of being e…
View article: Stratospheric gravity waves in three high-resolution models and AIRS satellite observations
Stratospheric gravity waves in three high-resolution models and AIRS satellite observations Open
Advances in computational power and model development have enabled the generation of global high-resolution models. These new models can resolve a large proportion of gravity waves (GWs) explicitly, reducing reliance on subgrid parametriza…
View article: Roles of Gravity Waves in Preconditioning of a Stratospheric Sudden Warming
Roles of Gravity Waves in Preconditioning of a Stratospheric Sudden Warming Open
As well as strong upward propagation of planetary waves from the troposphere, the state of the stratospheric mean flow has been recognized as a key factor for the occurrence of stratospheric sudden warmings (SSWs). The modification of the …
View article: Roles of Gravity Waves in Preconditioning of a Stratospheric Sudden Warming
Roles of Gravity Waves in Preconditioning of a Stratospheric Sudden Warming Open
As well as strong upward propagation of planetary waves from the troposphere, the state of the stratospheric mean flow has been recognized as a key factor for the occurrence of stratospheric sudden warmings (SSWs). The modification of the …
View article: A Comparison of Stratospheric Gravity Waves in a High‐Resolution General Circulation Model With 3‐D Satellite Observations
A Comparison of Stratospheric Gravity Waves in a High‐Resolution General Circulation Model With 3‐D Satellite Observations Open
Atmospheric gravity waves (GWs) play a key role in determining the thermodynamical structure of the Earth's middle atmosphere. Despite the small spatial and temporal scales of these waves, a few high‐top general circulation models (GCMs) t…
View article: Interhemispheric Coupling Study by Observations and Modelling (ICSOM): Concept, Campaigns, and Initial Results
Interhemispheric Coupling Study by Observations and Modelling (ICSOM): Concept, Campaigns, and Initial Results Open
An international joint research project, entitled Interhemispheric Coupling Study by Observations and Modelling (ICSOM), is ongoing. In the late 2000s, an interesting form of interhemispheric coupling (IHC) was discovered: when warming occ…
View article: A Comparison of Stratospheric Gravity Waves in a High-Resolution General Circulation Model with 3-D Satellite Observations
A Comparison of Stratospheric Gravity Waves in a High-Resolution General Circulation Model with 3-D Satellite Observations Open
Atmospheric gravity waves (GWs) play a key role in determining the thermodynamical structure of the Earth’s middle atmosphere. Despite the small spatial and temporal scales of these waves, a few high-top general circulation models (GCMs) t…
View article: Comparison of Stratospheric Gravity Waves in a High-resolution General Circulation Model with 3-D Satellite Observations
Comparison of Stratospheric Gravity Waves in a High-resolution General Circulation Model with 3-D Satellite Observations Open
Recently, high-resolution satellite instruments and general circulation models (GCMs) which resolve gravity waves explicitly are becoming available. However, because of their small temporal and spatial scales, the entire spectral range of …
View article: Interhemispheric Coupling Study by Observations and Modelling (ICSOM)
Interhemispheric Coupling Study by Observations and Modelling (ICSOM) Open
An international joint research project, entitled Interhemispheric Coupling Study by Observations and Modelling (ICSOM), is ongoing. In the late 2000s, an interesting form of interhemispheric coupling (IHC) was discovered: when warming occ…
View article: Contribution of gravity waves to universal vertical wavenumber (~m^(-3)) spectra revealed by a gravity-wave-permitting general circulation model
Contribution of gravity waves to universal vertical wavenumber (~m^(-3)) spectra revealed by a gravity-wave-permitting general circulation model Open
Observations with high vertical resolution have revealed that power spectra of horizontal wind and temperature fluctuations versus vertical wavenumber m have a universal shape with a steep slope in a high m range, approximately proportiona…
View article: Contribution of gravity waves to the universal vertical wavenumber (m–3) spectra revealed by a gravity-wave permitting general circulation model
Contribution of gravity waves to the universal vertical wavenumber (m–3) spectra revealed by a gravity-wave permitting general circulation model Open
<p>Observations with high vertical resolution have shown that vertical wavenumber (<em>m</em>) power spectra of horizontal wind and temperature fluctuations have a universal shape with a steep slope that is roughly propor…
View article: Contribution of gravity waves to universal vertical wavenumber (m^(-3)) spectra revealed by a gravity-wave-permitting general circulation model
Contribution of gravity waves to universal vertical wavenumber (m^(-3)) spectra revealed by a gravity-wave-permitting general circulation model Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19
Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19 Open
Since 2004, following prolonged stratospheric sudden warming (SSW) events, it has been observed that the stratopause disappeared and reformed at a higher altitude, forming an elevated stratopause (ES). The relative roles of atmospheric wav…
View article: Formation of a mesospheric inversion layer and the subsequent elevated stratopause associated with the major stratospheric sudden warming in 2018/19
Formation of a mesospheric inversion layer and the subsequent elevated stratopause associated with the major stratospheric sudden warming in 2018/19 Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Formation of a mesospheric inversion layer and the subsequent elevated stratopause associated with the major stratospheric sudden warming in 2018/19
Formation of a mesospheric inversion layer and the subsequent elevated stratopause associated with the major stratospheric sudden warming in 2018/19 Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Formation of the double stratopause and elevated stratopause associated with the major stratospheric sudden warming in 2018/19
Formation of the double stratopause and elevated stratopause associated with the major stratospheric sudden warming in 2018/19 Open
<p>After several recent stratospheric sudden warming (SSW) events, the stratopause disappeared and reformed at a higher altitude, forming an elevated stratopause (ES). The relative roles of atmospheric waves in the mechanism of ES fo…
View article: Formation of the double stratopause and elevated stratopause associated with the major stratospheric sudden warming in 2018/19
Formation of the double stratopause and elevated stratopause associated with the major stratospheric sudden warming in 2018/19 Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Characteristics and sources of gravity waves in the summer stratosphere based on long-term and high-resolution radiosonde observations
Characteristics and sources of gravity waves in the summer stratosphere based on long-term and high-resolution radiosonde observations Open
<p>Using long-term high-resolution operational radiosonde observation data from nine stations in the subtropics and mid-latitudes of Japan, this study performed statistical analysis of the dynamical characteristics of gravity waves (…
View article: Characteristics and Sources of Gravity Waves in the Summer Stratosphere Based on Long-Term and High-Resolution Radiosonde Observations
Characteristics and Sources of Gravity Waves in the Summer Stratosphere Based on Long-Term and High-Resolution Radiosonde Observations Open
Using long-term high-resolution operational radiosonde observation data from nine stations in the subtropics and mid-latitudes of Japan, this study performed statistical analysis of the dynamical characteristics of gravity waves (GWs). Wav…