Characteristics of Land-Air Exchange Parameters over Grassland in Southeast Tibet

Characteristics of Land-Air Exchange Parameters over Grassland in Southeast Tibet AbstractAccurate parameters that describe land–air exchange processes are essential for studying and predicting atmospheric processes over the Tibetan Plateau. Radiation, atmospheric thermal and moisture conditions, and turbulent heat and momentum fluxes were measured in the Yarlung Zangbo River, Southeast Tibet, in May–July 2013. Based on the above data, land–air exchange parameters were derived over the grassland surface, including the aerodynamic roughness length (z0m), thermal roughness length (z0h), the excess resistance to heat transfer (kB−1), and momentum and heat transfer coefficients (CD and CH, respectively). The average z0m was 7.0 cm, with a standard deviation of 1.4 cm; these values are higher than those observed in the central and western plateau regions and may have been affected by the tall grass and bush surface covers that surrounded the observation site. The average kB−1 was 5.7±1.8, which is higher than that in other plateau regions in the same season. The average CD during the observation period, (11.9±1.6) ×10−3, is also higher than that of other plateau regions. The commonly used iterative scheme and three non-iterative turbulent flux parameterization schemes were evaluated over Southeast Tibet using the above observational data. CD was underestimated by most schemes, whereas CH was overestimated by all schemes. Additional studies suggested that the iterative scheme performed best in retrieving the land–air exchange parameters and can be applied over Southeast Tibet. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Hydrometeorology American Meteorological Society

Characteristics of Land-Air Exchange Parameters over Grassland in Southeast Tibet

Journal of Hydrometeorology , Volume preprint (2017): 1 – Jun 28, 2017

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1525-7541
D.O.I.
10.1175/JHM-D-16-0084.1
Publisher site
See Article on Publisher Site

Abstract

AbstractAccurate parameters that describe land–air exchange processes are essential for studying and predicting atmospheric processes over the Tibetan Plateau. Radiation, atmospheric thermal and moisture conditions, and turbulent heat and momentum fluxes were measured in the Yarlung Zangbo River, Southeast Tibet, in May–July 2013. Based on the above data, land–air exchange parameters were derived over the grassland surface, including the aerodynamic roughness length (z0m), thermal roughness length (z0h), the excess resistance to heat transfer (kB−1), and momentum and heat transfer coefficients (CD and CH, respectively). The average z0m was 7.0 cm, with a standard deviation of 1.4 cm; these values are higher than those observed in the central and western plateau regions and may have been affected by the tall grass and bush surface covers that surrounded the observation site. The average kB−1 was 5.7±1.8, which is higher than that in other plateau regions in the same season. The average CD during the observation period, (11.9±1.6) ×10−3, is also higher than that of other plateau regions. The commonly used iterative scheme and three non-iterative turbulent flux parameterization schemes were evaluated over Southeast Tibet using the above observational data. CD was underestimated by most schemes, whereas CH was overestimated by all schemes. Additional studies suggested that the iterative scheme performed best in retrieving the land–air exchange parameters and can be applied over Southeast Tibet.

Journal

Journal of HydrometeorologyAmerican Meteorological Society

Published: Jun 28, 2017

References

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