Mesoscale Horizontal Kinetic Energy Spectra of an Eastward-Moving Southwest Vortex

Yu, Shiwang; Zhang, Lifeng; Wang, Yuan; Peng, Jun

doi:10.3390/atmos13050653

Cited by 4 publications

(4 citation statements)

References 34 publications

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“…However, differences of the slopes at different wavelength bands exist objectively. A large number of observational facts confirm that the spectral energy of wind displays spectral segments of a −3 slope at the synoptic scale and a −5/3 slope at the meso-scale over wavelengths of <500 km [42][43][44][45][46][47]. Moreover, the wind spectra show a transition characteristic, from dependence at a large-scale range to dependence at a meso-scale range [43,[47][48][49][50].…”

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 89%

“…A large number of observational facts confirm that the spectral energy of wind displays spectral segments of a −3 slope at the synoptic scale and a −5/3 slope at the meso-scale over wavelengths of <500 km [42][43][44][45][46][47]. Moreover, the wind spectra show a transition characteristic, from dependence at a large-scale range to dependence at a meso-scale range [43,[47][48][49][50]. For example, Yu et al [47] suggested that the average scale of spectral transition is around 300 km when investigating the characteristics of the horizontal Further insight into the total precipitation spectral variance (dashed line in Figure 8) and wind spectral variance (dotted line in Figure 8) is gained.…”

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 97%

“…Moreover, the wind spectra show a transition characteristic, from dependence at a large-scale range to dependence at a meso-scale range [43,[47][48][49][50]. For example, Yu et al [47] suggested that the average scale of spectral transition is around 300 km when investigating the characteristics of the horizontal Further insight into the total precipitation spectral variance (dashed line in Figure 8) and wind spectral variance (dotted line in Figure 8) is gained. It can be seen that the precipitation variances of the three study areas are not exactly the same.…”

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 99%

“…Moreover, the wind spectra show a transition characteristic, from dependence at a large-scale range to dependence at a meso-scale range [43,[47][48][49][50]. For example, Yu et al [47] suggested that the average scale of spectral transition is around 300 km when investigating the characteristics of the horizontal kinetic energy spectra of an eastward-moving southwest vortex. Sun et al [50] found a distinct transition of the wind spectra at a scale of ~400 km.…”

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 99%

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Research on the Terrain Characteristics of Changbai Mountain and Their Impact on Precipitation and Wind Distribution

Liang,

Ai,

Yang

et al. 2024

Atmosphere

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The terrain of Changbai Mountain has great influence on the distribution of atmospheric flows and the occurrence and development of precipitation. However, quantitative studies on the real terrain characteristics and the terrain effect on precipitation distribution in this region are scant at present. This study quantitatively analyzes the regional characteristic of topographic perturbations and the relationship between terrain, wind, and precipitation in Changbai Mountain region by using a spectral analysis of the two-dimensional discrete cosine transform. Three domains with relatively heavy summer precipitation are selected as the study region. The results indicate that the overall terrain of the Changbai Mountain region exhibits anisotropic characteristics. The terrain spectra of domain B are less than those of domains A and C across the whole wavelength (λ) bands, indicating that the large-scale topographic perturbations of domain B are relatively weak. The largest topographic spectral peak of domain C shows the most pronounced undulation of terrain among the three domains. The dominant wavelengths of terrain height variance for domains A and C, both close to the respective maximum wavelengths, indicate more prominent large-scale topographic perturbations. For domain A, the variation of the precipitation spectra is consistent with that of the wind spectra at the wavelength bands of λ < 390 km, showing a high correlation between wind field and the occurrence of rainfall. The inverse relationship at larger wavelengths indicates that multiple factors contribute to the occurrence of rainfall. For domain B, there is consistency in the fluctuations of terrain spectra, precipitation spectra, and wind spectra at the wavelength bands of λ < 278.3 km, implying that the smaller-scale terrain has an important effect on the occurrence of summer precipitation. For domain C, the variations of terrain spectra, precipitation spectra, and wind spectra are almost consistent across the whole wavelength bands, indicating that the large-scale terrain and minor terrain both play a crucial role in atmospheric uplift and the occurrence and development of summer rainfall.

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Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 89%

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 97%

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 99%

“…Moreover, the wind spectra show a transition characteristic, from dependence at a large-scale range to dependence at a meso-scale range [43,[47][48][49][50]. For example, Yu et al [47] suggested that the average scale of spectral transition is around 300 km when investigating the characteristics of the horizontal kinetic energy spectra of an eastward-moving southwest vortex. Sun et al [50] found a distinct transition of the wind spectra at a scale of ~400 km.…”

Section: The Spectral Analysis Of Terrain Precipitation and Wind Fieldmentioning

confidence: 99%

See 2 more Smart Citations

Research on the Terrain Characteristics of Changbai Mountain and Their Impact on Precipitation and Wind Distribution

Liang,

Ai,

Yang

et al. 2024

Atmosphere

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Dynamic and thermodynamic characteristics of warm-sector rainstorms caused by the southwest china vortex in sichuan basin

Zhou,

2024

Theor Appl Climatol

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Using automatic rainfall station and ERA5 reanalysis data, the Southwest China vortex (SWCV) processes that induce warm-sector rainstorms in the Sichuan Basin were analyzed, their environmental field and dynamic thermal characteristics were researched through physical diagnosis and dynamic synthesis, and the development mechanism was discussed. The results showed that for the warm-sector rainstorms caused by the SWCV (SWCV-WR), the general circulation backgrounds can could be divided into three types: upper trough-vortex (Type I), plateau shear line (Type II), and short-wave trough (Type III) types. Regarding the aspects of the maintenance of the SWCV, duration of the warm-sector rainstorms, and maximum hourly precipitation intensity, the influence of Type I is the most evident, followed by Types II and III for SWCV-WR. The vertical structure of the SWCV is shallow and inclined to the west with height, but the positive vorticity of Types I and II can reach up to 200 hPa for SWCV-WR. The pseudo-equivalent potential temperature in the vortex area is greater than 354 K, which is accompanied by an upward-energy tongue, and shallow secondary circulation occurs on the eastern side of the SWCV, promoting vortex development. Regarding the thermodynamic characteristics of SWCV, Type I is the strongest, followed by Type III, and Type II is the weakest. The water vapor supply in different types of SWCV-WR is not only closely related to the strength of water vapor transport in the Bay of Bengal, but also to the variations in water vapor transport caused by the influence of different water vapor sources, such as the South China Sea and western Pacific Ocean, during its transportation. For SWCV-WR, the vorticity advection presents an uneven east-west positive and negative distribution. Under the dynamic forcing, the positive vorticity on the east side of SWCV of Types I and II (III) is enhanced (weakened), while that on the west side is weakened (enhanced). Different atmospheric vorticity variations have different significant effects on the three types of SWCV-WR. Under the spatial non-uniform heating, the horizontal non-uniform heating effect on the different types of SWCV-WR has regional differences, while the vertical non-uniform heating effect has the largest effect on the spatial non-uniform heating and a positive heating effect on the three types of SWCV-WR. Therefore, the spatial non-adiabatic heating effect, particularly the vertical non-uniform heating effect, is an important mechanism for the development and evolution of SWCV and SWCV-WR.

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Research on the Terrain Characteristics of Changbai Mountain and Its Impact on Precipitation and Wind Distribution

Liang,

Ai,

Yang

et al. 2024

Preprint

View full text Add to dashboard Cite

The terrain of Changbai Mountain has great influence on the distribution of atmospheric flows and the occurrence and development of precipitation. This study quantitatively analyzes the regional characteristic of topographic perturbations and the relationship between terrain, wind and precipitation in Changbai Mountain region, by using a spectral analysis of the two-dimensional discrete cosine transform. Three domains with relatively heavy summer precipitation are selected as the study region. The results indicate that the overall terrain of Changbai Mountain region exhibits anisotropic characteristics. The terrain spectra of domain B are less than those of domain A and C across the whole wavelength (λ) bands, indicating that the large-scale topographic perturbations of domain B are relatively weak. The largest topographic spectral peak of domain C shows the most pronounced undulation of terrain among the three domains. The dominant wavelengths of terrain height variance for domain A and C, both close to the respective maximum wavelengths, indicate more prominent large-scale topographic perturbations. For domain A, the variation of the precipitation spectra is consistent with that of the wind spectra at the wavelength bands of λ < 390 km, showing a high correlation between wind field and the occurrence of rainfall. The inverse relationship at larger wavelengths indicates that multiple factors contribute to the occurrence of rainfall. For domain B, there is consistency in the fluctuations of terrain spectra, precipitation spectra, and wind spectra at the wavelength bands of λ < 278.3 km, implying that the smaller-scale terrain has an important effect on the occurrence of summer precipitation. For domain C, the variations of terrain spectra, precipitation spectra, and wind spectra are almost consistent across the whole wavelength bands, indicating that the large-scale terrain and minor terrain both play a crucial role in atmospheric uplift and the occurrence and development of summer rainfall.

show abstract

Mesoscale Horizontal Kinetic Energy Spectra of an Eastward-Moving Southwest Vortex

Cited by 4 publications

References 34 publications

Research on the Terrain Characteristics of Changbai Mountain and Their Impact on Precipitation and Wind Distribution

Research on the Terrain Characteristics of Changbai Mountain and Their Impact on Precipitation and Wind Distribution

Dynamic and thermodynamic characteristics of warm-sector rainstorms caused by the southwest china vortex in sichuan basin

Research on the Terrain Characteristics of Changbai Mountain and Its Impact on Precipitation and Wind Distribution

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