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Title: Validating the Water Vapor Variance Similarity Relationship in the Interfacial Layer Using Observations and Large-Eddy Simulations

Abstract

In previous work, the similarity relationship for the water vapor variance in the interfacial layer (IL) at the top of the convective boundary layer (CBL) was proposed to be proportional to the convective velocity scale and the gradients of the water vapor mixing ratio and the Brunt-Vaisala frequency in the entrainment zone. In the presence of wind shear in the IL, the similarity relationship was hypothesized to also include a dependence on the gradient Richardson number. Simultaneous measurements of the surface buoyancy flux, wind-shear profiles from a radar wind profiler, water vapor mixing ratio and temperature measurements and their gradients from a Raman lidar provide a unique opportunity to thoroughly examine the function used in defining the variance and validate it. These observations were made over the Atmospheric Radiation Measurement Southern Great Plains site. We identified 19 cases from 2016 during which the CBL was quasi-stationary and well mixed for at least 2 hr in the afternoon. Furthermore, we simulated the CBL using a large-eddy simulation (LES) model for these cases and derived the water vapor variance and other profiles to test the similarity function. Utilizing this unique combination of observations and LES, we demonstrate that the water vapor variancemore » in the IL has little-to-no dependence on wind shear. Furthermore, we demonstrate that the predicted variance using the original similarity function matches the observed and LES-modeled variance very well, with linear correlations between the two variances of 0.82 and 0.95, respectively.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Univ. of Oklahoma, Norman, OK (United States)
  2. NOAA Earth System Research Laboratory, Boulder, CO (United States)
  3. Cleveland State Univ., Cleveland, OH (United States)
  4. Univ.of Hohenheim, Stuttgart (Germany)
Publication Date:
Research Org.:
Univ. of Oklahoma, Norman, OK (United States)
Sponsoring Org.:
Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
OSTI Identifier:
1598943
Alternate Identifier(s):
OSTI ID: 1571314
Grant/Contract Number:  
SC0014375
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 124; Journal Issue: 20; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Turbulence; atmospheric convective boundary layer; water vapor

Citation Formats

Osman, M. K., Turner, D. D., Heus, T., and Wulfmeyer, V. Validating the Water Vapor Variance Similarity Relationship in the Interfacial Layer Using Observations and Large-Eddy Simulations. United States: N. p., 2019. Web. https://doi.org/10.1029/2019JD030653.
Osman, M. K., Turner, D. D., Heus, T., & Wulfmeyer, V. Validating the Water Vapor Variance Similarity Relationship in the Interfacial Layer Using Observations and Large-Eddy Simulations. United States. https://doi.org/10.1029/2019JD030653
Osman, M. K., Turner, D. D., Heus, T., and Wulfmeyer, V. Sat . "Validating the Water Vapor Variance Similarity Relationship in the Interfacial Layer Using Observations and Large-Eddy Simulations". United States. https://doi.org/10.1029/2019JD030653. https://www.osti.gov/servlets/purl/1598943.
@article{osti_1598943,
title = {Validating the Water Vapor Variance Similarity Relationship in the Interfacial Layer Using Observations and Large-Eddy Simulations},
author = {Osman, M. K. and Turner, D. D. and Heus, T. and Wulfmeyer, V.},
abstractNote = {In previous work, the similarity relationship for the water vapor variance in the interfacial layer (IL) at the top of the convective boundary layer (CBL) was proposed to be proportional to the convective velocity scale and the gradients of the water vapor mixing ratio and the Brunt-Vaisala frequency in the entrainment zone. In the presence of wind shear in the IL, the similarity relationship was hypothesized to also include a dependence on the gradient Richardson number. Simultaneous measurements of the surface buoyancy flux, wind-shear profiles from a radar wind profiler, water vapor mixing ratio and temperature measurements and their gradients from a Raman lidar provide a unique opportunity to thoroughly examine the function used in defining the variance and validate it. These observations were made over the Atmospheric Radiation Measurement Southern Great Plains site. We identified 19 cases from 2016 during which the CBL was quasi-stationary and well mixed for at least 2 hr in the afternoon. Furthermore, we simulated the CBL using a large-eddy simulation (LES) model for these cases and derived the water vapor variance and other profiles to test the similarity function. Utilizing this unique combination of observations and LES, we demonstrate that the water vapor variance in the IL has little-to-no dependence on wind shear. Furthermore, we demonstrate that the predicted variance using the original similarity function matches the observed and LES-modeled variance very well, with linear correlations between the two variances of 0.82 and 0.95, respectively.},
doi = {10.1029/2019JD030653},
journal = {Journal of Geophysical Research: Atmospheres},
number = 20,
volume = 124,
place = {United States},
year = {2019},
month = {9}
}

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