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 (\(\hbox {150 W m}^{-2}\)) is half of the maximum latent heat (\(\hbox {300 W m}^{-2}\)) 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.
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Acknowledgements
We express our sincere gratitude to the director, IITM for his constant encouragement and support. We thank all the members of the project team for all possible help. The Centre for Climate Change Research (CCCR) is part of the Indian Institute of Tropical Meteorology, Pune (IITM) and is fully supported by Earth System Science Organisation (ESSO) of the Ministry of Earth Sciences (MoES), Government of India.
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Deb Burman, P.K., Sarma, D., Morrison, R. et al. Seasonal variation of evapotranspiration and its effect on the surface energy budget closure at a tropical forest over north-east India. J Earth Syst Sci 128, 127 (2019). https://doi.org/10.1007/s12040-019-1158-x
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DOI: https://doi.org/10.1007/s12040-019-1158-x