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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/128/05/0127

    • Keywords

       

      Eddy covariance; Indian summer monsoon; MetFlux India; surface energy budget; tropical forest; India.

    • Abstract

       

      This study uses 1 yr of eddy covariance (EC) flux observations to investigate seasonal variations in evapotranspiration (ET) and surface energy budget (SEB) closure at a tropical semi-deciduous forest located in north-east India. The annual cycle is divided into four seasons, namely, pre-monsoon, monsoon, post-monsoon and winter. The highest energy balance closure (76%) is observed during pre-monsoon, whereas the lowest level of closure (62%) is observed during winter. Intermediate closure of 68% and 72% is observed during the monsoon and post-monsoon seasons, respectively. Maximum latent heat flux during winter (150 W m$^{-2}$) is half of the maximum latent heat (300 W m$^{-2}$) flux during the monsoon. ET is a controlling factor of SEB closure, with the highest rates of closure corresponding to the periods of the highest ET. The Bowen ratio ranges from 0.93 in winter to 0.27 during the monsoon. This is the first time the role of ET in the seasonal variation of SEB closure has been reported for any ecosystem in north-east India using EC measurements.

    • Author Affiliations

       

      Pramit Kumar Deb Burman1 2 Dipankar Sarma3 Ross Morrison4 Anandakumar Karipot2 Supriyo Chakraborty1

      1. Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune 411 008, India.
      2. Department of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune 411 007, India.
      3. Department of Environmental Sciences, Tezpur University, Tezpur 784 028, India.
      4. Land Surface Science, Hydro-Climate Risks, NERC Centre for Ecology and Hydrology, Wallingford, Oxfordshire OX10 8BB, UK.

    • Dates

       
      Published
      1 July 2019
      Manuscript received
      17 April 2018
      Manuscript revised
      21 December 2018
      Accepted
      1 January 2019
      Final version published online
      15 May 2019

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