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The influence of wind speed on surface layer stability and turbulent fluxes over southern Indian peninsula station

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Abstract

Surface to atmosphere exchange has received much attention in numerical weather prediction models. This exchange is defined by turbulent parameters such as frictional velocity, drag coefficient and heat fluxes, which have to be derived experimentally from high-frequency observations. High-frequency measurements of wind speed, air temperature and water vapour mixing ratio (eddy covariance measurements), were made during the Integrated Ground Observation Campaign (IGOC) of Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) at Mahabubnagar, India (16∘44′N, 77∘59′E) in the south-west monsoon season. Using these observations, an attempt was made to investigate the behaviour of the turbulent parameters, mentioned above, with respect to wind speed. We found that the surface layer stability derived from the Monin–Obukhov length scale, is well depicted by the magnitude of wind speed, i.e., the atmospheric boundary layer was under unstable regime for wind speeds >4 m s−1; under stable regime for wind speeds <2 m s−1 and under neutral regime for wind speeds in the range of 2–3 m s−1. All the three stability regimes were mixed for wind speeds 3–4 m s−1. The drag coefficient shows scatter variation with wind speed in stable as well as unstable conditions.

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Acknowledgements

The authors express their gratitude to Dr M Rajeevan, Director, Indian Institute of Tropical Meteorology, Pune for inspiration. The CAIPEEX-IGOC program was fully funded by the Ministry of Earth Sciences, Govt. of India.

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Authors and Affiliations

  1. Indian Institute of Tropical Meteorology, Dr Homi Bhabha Road, Pashan, Pune, 411 008, India

    M N Patil, R T Waghmare, T Dharmaraj, G R Chinthalu, Devendraa Siingh & G S Meena

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  1. M N Patil
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  2. R T Waghmare
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  3. T Dharmaraj
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  4. G R Chinthalu
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  5. Devendraa Siingh
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  6. G S Meena
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Correspondence to M N Patil.

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Corresponding editor: K Rajendran

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Patil, M.N., Waghmare, R.T., Dharmaraj, T. et al. The influence of wind speed on surface layer stability and turbulent fluxes over southern Indian peninsula station. J Earth Syst Sci 125, 1399–1411 (2016). https://doi.org/10.1007/s12040-016-0735-5

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  • DOI: https://doi.org/10.1007/s12040-016-0735-5

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