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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 6
Ann. Geophys., 32, 669–675, 2014
https://doi.org/10.5194/angeo-32-669-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 669–675, 2014
https://doi.org/10.5194/angeo-32-669-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 19 Jun 2014

ANGEO Communicates | 19 Jun 2014

Assessment of a surface-layer parameterization scheme in an atmospheric model for varying meteorological conditions

T. J. Anurose and D. Bala Subrahamanyam T. J. Anurose and D. Bala Subrahamanyam
  • Space Physics Laboratory, Vikram Sarabhai Space Centre, Dept. of Space, Govt. of India, Indian Space Research Organization, Thiruvananthapuram – 695 022, Kerala, India

Abstract. The performance of a surface-layer parameterization scheme in a high-resolution regional model (HRM) is carried out by comparing the model-simulated sensible heat flux (H) with the concurrent in situ measurements recorded at Thiruvananthapuram (8.5° N, 76.9° E), a coastal station in India. With a view to examining the role of atmospheric stability in conjunction with the roughness lengths in the determination of heat exchange coefficient (CH) and H for varying meteorological conditions, the model simulations are repeated by assigning different values to the ratio of momentum and thermal roughness lengths (i.e. z0m/z0h) in three distinct configurations of the surface-layer scheme designed for the present study. These three configurations resulted in differential behaviour for the varying meteorological conditions, which is attributed to the sensitivity of CH to the bulk Richardson number (RiB) under extremely unstable, near-neutral and stable stratification of the atmosphere.

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