Journal ArticleDOI
Comparison of mixing layer heights determined using LiDAR, radiosonde, and numerical weather prediction model at a rural site in southern India
R. Vishnu,Y. Bhavani Kumar,P. R. Sinha,T. Narayana Rao,E. James Jebaseelan Samuel,Pratima Kumar +5 more
TLDR
In this paper, the authors used ground-based elastic backscatter LiDAR (EBL) profiles for the determination of mixing layer height (MLH) and compared it with concurrent radiosonde (RS) observations [MLH (RS)] and numerical models.Abstract:
There is no agreed reference method for accurately determination of mixing layer height (MLH) in the existing literature. In part, this is due to different definitions of the atmospheric boundary layer exist, depending on the quantities and the physical processes invoked. In addition, MLH during late afternoon transition period is highly challenging to determine and perform model simulations because of the rapid variations in turbulent kinetic energy. For the first time, MLH has been determined at remote tropical site of Gadanki, India (13.45°N, 79.17°E, 360 masl) using ground-based elastic backscatter LiDAR (EBL). This article focuses on the late afternoon transition period and compares it with MLH obtained from the EBL to concurrent radiosonde (RS) observations [MLH (RS)] and numerical models. Five different techniques have been applied to the EBL backscatter profiles for the determination of MLH. The mean of the five methods agreed to within 15% with the RS-derived MLH under various synoptic co...read more
Citations
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Numerical study of convection observed during the Winter Monsoon Experiment using a mesoscale two-dimensional model [presentation]
TL;DR: In this article, a two-dimensional version of the Pennsylvania State University mesoscale model has been applied to Winter Monsoon Experiment data in order to simulate the diurnally occurring convection observed over the South China Sea.
Journal ArticleDOI
Summertime Urban Mixing Layer Height over Sofia, Bulgaria
TL;DR: In this paper, a comparison between proprietary (Jenoptik) and freely available (STRAT) algorithms to retrieve MLH diurnal cycle over an urban area was conducted in the summer season when MLH is above the full overlapping height of the ceilometer in order to minimize negative impact of the biaxial LiDAR's drawback.
Journal ArticleDOI
An Investigation of the Elevated Aerosol Layer Using a Polarization Lidar Over a Tropical Rural Site in India
TL;DR: Polarization lidar observations were made to study the transport of an elevated aerosol layer over Gadanki, India (13.45° N, 79.17° E) during the pre-monsoon period of the year 2009 as mentioned in this paper.
Journal ArticleDOI
The impact of improved air-quality due to COVID-19 lockdown on surface meteorological parameters and planetary boundary layer over Gadanki, a tropical rural site in India
TL;DR: In this paper, the authors focused on the changes in the vertical structure of aerosol concentration and how those changes impacted radiation balance, the planetary boundary layer (PBL) height and surface meteorological parameters.
References
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Journal ArticleDOI
Physical and optical properties of aerosols over an urban location in western India: Seasonal variabilities
TL;DR: In this paper, the authors present results on various physical and optical properties of aerosols measured over Ahmedabad, an urban location in western India, from 2002 to 2005 and discuss their seasonal and interannual variabilities.
Journal ArticleDOI
Detection and Analysis of Microfronts and Associated Coherent Events Using Localized Transforms
Nimal Gamage,Carl Hagelberg +1 more
TL;DR: In this article, a covariance transform is defined that measures the covariance between the signal and a dilated and translated generating function which has compact support, which is shown to be superior as a method of detecting events containing sharp edges such as fronts or microfronts when compared with energy-preserving transforms such as the Fourier and wavelet transform.
Journal ArticleDOI
Atmospheric Turbidity in Saharan Dust Outbreaks as Determined by Analyses of Satellite Brightness Data
TL;DR: Using VHRR brightness data obtained from the NOAA 3 satellite, isopleths of aerosol optical depth for Saharan dust have been drawn for seven days during summer 1974 over a portion of the eastern equatorial North Atlantic as discussed by the authors.
Journal ArticleDOI
Structure and growth of the mixing layer over the Amazonian rain forest
Charles L. Martin,David R. Fitzjarrald,Michael Garstang,Amauri Pereira de Oliveira,Steve Greco,Edward V. Browell +5 more
TL;DR: The structure and growth of the atmospheric mixed layer over the Amazonian rain forest were examined using measurements obtained during the NASA Amazon Boundary Layer Experiment as mentioned in this paper, and it was found that the mixing layer grows rapidly, at 5-8 cm/sec, soon after sunrise to a mean maximum height of 1200 m by 1300 LT.
Journal ArticleDOI
Estimation of atmospheric mixing layer height from radiosonde data
Xiaoyan Wang,Kaicun Wang +1 more
TL;DR: In this article, the authors proposed a method to integrate the information of temperature, humidity and cloud to generate a consistent estimate of mixing layer height (h) using high-resolution radiosonde data collected at 79 stations over North America during the period from 1998 to 2008.
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