High resolution observations of turbulence in the troposphere and lower stratosphere over Gadanki

Dutta, Gopa; Kumar, Mukesh; Kumar, P. Vinay; Rao, P. V. S. Rama; Bapiraju, B.; Basha, H. Aleem

doi:10.5194/angeo-27-2407-2009

Cited by 15 publications

(8 citation statements)

References 40 publications

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“…Turbulence parameters estimated from a campaign of one month simultaneous MST radar and radiosonde observations at Gadanki are presented by Ghosh et al [2003]. From the same location, high‐resolution (150 m) wind measurements from 13–17 July 2004 by MST radar and 15–16 July 2004 by lower atmospheric wind profiler (LAWP) were used to study the time variation of turbulence intensity by Dutta et al [2009]. It may be noted that none of these studies except Rao et al [2001] had observations in the premonsoon season.…”

Section: Resultsmentioning

confidence: 99%

First observations of turbulence parameters in the troposphere over the Bay of Bengal and the Arabian Sea using radiosonde

Alappattu¹,

Kunhikrishnan²

2010

J. Geophys. Res.

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[1] This paper discusses the turbulence characteristics of the free atmosphere over the Bay of Bengal and the Arabian Sea during the premonsoon season of 2006. The turbulence scaling concepts, developed over the past decades for application to oceanic mixing, are used for retrieving turbulence properties in the free atmosphere from high-resolution soundings, as described by Clayson and Kantha (2008). The variability in the vertical turbulence structure over a large spatial region is studied using this novel method for the first time. Investigations revealed the presence of a highly turbulent band at upper troposphere below the cold point tropopause (CPT) with significant enhancements in Thorpe length and eddy diffusion coefficient. This increased turbulence is studied in conjunction with the observations of the tropical tropopause layer (TTL). It is seen that the lower and upper boundaries of this turbulence band nearly coincide with the height where the potential temperature lapse rate begins to show a decrease (LRH min ) and cold point tropopause, respectively. The TTL is the transition regime from convectively dominated troposphere to radiatively dominated stratosphere, and is characterized by a decrease in the static stability. The enhanced zonal and meridional wind shear observed in this region shows that the stability in this region is further weakened because of the breaking of Kelvin-Helmholtz waves, which results in the enhancement of turbulence. The study reveals the potential of high-resolution soundings to be used in the investigations of turbulence in the free atmosphere.

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Section: Resultsmentioning

confidence: 99%

First observations of turbulence parameters in the troposphere over the Bay of Bengal and the Arabian Sea using radiosonde

Alappattu¹,

Kunhikrishnan²

2010

J. Geophys. Res.

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“…Rao et al (2001a) looked at seasonal and daily variations of the turbulent energy dissipation rate in India. Rao et al (2001b), Sasi and Vijayan (2001), Krishna Murthy (2002, 2004), Nastrom et al (2004), Dutta et al (2009) andSingh et al (2008) made further equatorial studies. Nastrom and Tsuda (2001) studied differences in spectral characteristics at White Sands and at the MU radar.…”

Section: Turbulencementioning

confidence: 93%

A review of Mesosphere–Stratosphere–Troposphere (MST) radar developments and studies, circa 1997–2008

Hocking

2011

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Turbulent flows in the lower atmosphere are important due to their considerable impacts on the diffusion of momentum and chemical materials (Fritts et al, ), commercial aircraft (Sharman et al, ), and energy transfer. Turbulence plays a dominant role in mass and energy exchanges between the troposphere and the stratosphere (Dutta et al, ). It dramatically varies in the spatiotemporal domain and has length scales and decay times ranging from approximately a few hundred meters to a few centimeters in the lower atmosphere (Hocking, ) and from one third to one half of the Brunt‐Väisälä frequency in a stably stratified fluid (Crawford, ).…”

Section: Introductionmentioning

confidence: 99%

Latitudinal and Topographical Variabilities of Free Atmospheric Turbulence From High‐Resolution Radiosonde Data Sets

Zhang

Huang

et al. 2019

JGR Atmospheres

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This study aims to determine the latitudinal and topographical dependencies of turbulent flow by applying Thorpe analysis to abundant high‐resolution radiosonde data sets. Results show that turbulent energy dissipation rates are lognormally distributed with average central values of 2.7 × 10−4 and 2.9 × 10−4 m2/s3 in the troposphere and stratosphere, respectively. Moreover, they exhibit similar vertical variations at different latitudes from the lower free troposphere up to the tropopause region. Dissipation rates are quantitatively comparable at all latitudes but do exhibit significant seasonal variability. Thus, these rates have apparent seasonal cycles at middle latitudes but weak cycles at low and high latitudes. The influence of terrain is an important feature of turbulent motions. Turbulent activities over mountainous topographies exhibit larger variances than those over flat terrains in the lower troposphere and more outstanding enhancements in the tropopause region. In general, these results are comparable with those of radars in terms of magnitude, and the differences between them can be related to different measurement principles.

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High resolution observations of turbulence in the troposphere and lower stratosphere over Gadanki

Cited by 15 publications

References 40 publications

First observations of turbulence parameters in the troposphere over the Bay of Bengal and the Arabian Sea using radiosonde

First observations of turbulence parameters in the troposphere over the Bay of Bengal and the Arabian Sea using radiosonde

A review of Mesosphere–Stratosphere–Troposphere (MST) radar developments and studies, circa 1997–2008

Latitudinal and Topographical Variabilities of Free Atmospheric Turbulence From High‐Resolution Radiosonde Data Sets

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