Nature of Streaky Structures Observed with a Doppler Lidar

Yagi, Akira; Inagaki, Atsushi; Kanda, Manabu; Fujiwara, Chusei; Fujiyoshi, Yasushi

doi:10.1007/s10546-016-0213-2

Cited by 20 publications

(6 citation statements)

References 36 publications

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“…Similarity assumptions in the boundary layer then reduce the number of prescribed parameters (i.e Reynolds stress tensors and turbulence length scales) to identical velocity and length scales (e.g. Marusic and Hutchins, 2008;Marusic et al, 2010;Takimoto et al, 2013;Yagi et al, 2017). In combination with the offline nesting (see Sect.…”

Section: Lateral Boundary Conditionsmentioning

confidence: 99%

Overview of the PALM model system 6.0

Maronga¹,

Banzhaf²,

Burmeister³

et al. 2019

Preprint

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Abstract. In this paper we describe the PALM model system 6.0. PALM is a Fortran based code and has been applied for studying a variety of atmospheric and oceanic boundary layers for about 20 years. The model is optimized for use on massively parallel computer architectures. This is a follow-up paper to the PALM 4.0 model description in Maronga et al. (2015). During the last years, PALM has been significantly improved and now offers a variety of new components. In particular, much effort was made to enhance the model by components needed for applications in urban environments, like fully interactive land surface and radiation schemes, chemistry, and an indoor model. This paper serves as an overview paper of the PALM 6.0 model system and we describe its current model core. The individual components for urban applications, case studies, validation runs, and issues with suitable input data are presented and discussed in a series of companion papers in this special issue.

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Section: Lateral Boundary Conditionsmentioning

confidence: 99%

Overview of the PALM model system 6.0

Maronga¹,

Banzhaf²,

Burmeister³

et al. 2019

Preprint

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“…where z i is the atmospheric boundary-layer height. Although we have not directly measured z i , it was estimated as 309 m, which is the average of the direct measurements using Doppler lidar (Yagi et al 2017) at the same site from 1 January 2013 to 11 February 2013. As a result, w * /u * = 8.8 for our winter observations, which satisfies the necessary condition of being greater than 5.…”

Section: Weather Conditionsmentioning

confidence: 99%

Use of Thermal Image Velocimetry to Measure a Dust-Devil-Like Vortex Within a Sports Ground in a Residential Area

Inagaki

Kanda

2021

Boundary-Layer Meteorol

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We investigate the characteristics of a dust-devil-like vortex (DDLV) observed using thermal image velocimetry (TIV) at a sports ground in Tokyo. Thermal image velocimetry provides unique observations of the two-dimensional velocity distribution for a DDLV with high spatio–temporal resolution (i.e., tens of cm s−1) near the ground. Two DDLVs were detected, one each in summer and winter, and the quantitative features of the larger, stronger DDLV in the winter are examined. The size and strength of the detected DDLV, which are quantified using TIV, are within the ranges reported in past observations and numerical simulations of dust devils. The vortex appears at the boundary of a cold-air current near a 55-m building wall, and persists for more than 3 min.

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“…1 как λ y ~ hπ/α, λ z ~ hπ/β 0 и представляем их на рис. 11. как видно, горизонтальные масштабы в лежат в диапазоне 400-800 м, с ос-новным распределением в области 500-600 м, вертикальные масштабы сосредоточены в области 45-65 м. интересно отметить, что эти значения оказываются близкими к недавним данным полученным при лидарном зондировании атмосферы [35] и данным микросодара, полученным в летнее время в цимлянске 2017, 2018 гг. (вертикальное разрешение 1 м (от 2 до 50 м), временное 1 с) [36].…”

Section: то есть можно полагатьunclassified

“…а.М. Обухова Ран (цнС) проводились испытания доплеровского трехкомпонентного минисодара высокого разрешения, получившего название ВРМС -Высокого Разрешения Мини Содар (английская аббревиатура -HRMS) [35]. Оригинальная конструкция ВРМС, использующая раздельные акустические антенны для излучения и приема звука, позволила уменьшить мертвую зону локатора и охватить измерениями диапазон высот от 3 до 45 м при разрешающей способности около одного метра по высоте и одной секунды по времени.…”

Section: то есть можно полагатьunclassified

“…Физические механизмы усиления и поддержания таких структур связывают со сдвиговыми неустойчивостями [39] или конвективной аналогией [40], где роль температурного поля играют турбулентные напряжения Рейнольдса. Турбулентная спиральность, присутствующая в аПС [35,41], может быть одним из источников интенсификации завихренности в таких структурах [42,43]. 5 11 Предложенная выше простая модель, учитывающая основной механизм роста возмущений, связанный как со сдвигом, так и с агеострофической компонентой скорости ветра в аПС, позволяет оценить их характерные масштабы и ориентацию.…”

Section: то есть можно полагатьunclassified

See 1 more Smart Citation

On the algebraic perturbations in atmospheric boundary layer

Chkhetiani

Vazaeva

2019

Известия Российской академии наук. Физика атмосферы и океана

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A simple model for the development of submesoscale perturbations in the atmospheric boundary layer (ABL) is proposed. The growth of perturbations is associated with the shear algebraic instability of the wind velocity profile in the atmospheric boundary layer (ABL). For the scales of optimal perturbations (streaks) in the lower part of the ABL, estimates of their sizes were obtained about 100-200 m vertically and 300-600 m horizontally. Similar scales are noted for experimental data on the structure of the wind field in the lower part of the ABL, obtained in 2017, 2018 in the summer at the Tsimlyansk Scientific Station at the acoustic sounding of the atmosphere by the Doppler three-component minisodar of high resolution.

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Nature of Streaky Structures Observed with a Doppler Lidar

Cited by 20 publications

References 36 publications

Overview of the PALM model system 6.0

Overview of the PALM model system 6.0

Use of Thermal Image Velocimetry to Measure a Dust-Devil-Like Vortex Within a Sports Ground in a Residential Area

On the algebraic perturbations in atmospheric boundary layer

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