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Original Research Papers

Vertical profiles and storage fluxes of CO2, heat and water in a tropical rainforest at Pasoh, Peninsular Malaysia

Authors:

Shinjiro Ohkubo ,

Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, JP
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Yoshiko Kosugi,

Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, JP
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Satoru Takanashi,

Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, JP
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Naoko Matsuo,

Faculty of Bioresources, Mie University, Tsu, Mie 514-8507, JP
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Makoto Tani,

Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, JP
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Abdul Rahim Nik

Forest Research Institute Malaysia, Kepong, Kuala Lumpur 52109, MY
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Abstract

Ambient CO2 concentration, air temperature and relative humidity were measured intermittently for a 3-year period from the floor to the canopy top of a tropical rainforest in Pasoh, Peninsular Malaysia. Mean diurnal CO2 storage flux (Sc; μmol m-2 s-1) and sensible and latent heat storage fluxes (Qa and Qw; W m-2) ranged from -12.7 to 3.2 μmol m-2 s-1, -15 to 27 W m-2 and -10 to 20 W m-2, respectively. Small differences in diurnal changes were observed in Sc and Qa between the driest and wettest periods. Compared with the ranges of mean diurnal CO2 eddy flux (-14.7 to 4.9 μmol m-2 s-1), sensible eddy flux (-12 to 169 W m-2) and latent eddy flux (0 to 250 W m-2), the contribution of CO2 storage flux was especially large. Comparison with summertime data from a temperate Japanese cypress forest suggested a higher contribution of Sc in the tropical rainforest, probably mainly due to the difference in nighttime friction velocity at the sites. On the other hand, differences in Qa and Qw were smaller than the difference in Sc, probably because of the smaller nighttime sinks/sources of heat and water vapour.

How to Cite: Ohkubo, S., Kosugi, Y., Takanashi, S., Matsuo, N., Tani, M. and Nik, A.R., 2008. Vertical profiles and storage fluxes of CO2, heat and water in a tropical rainforest at Pasoh, Peninsular Malaysia. Tellus B: Chemical and Physical Meteorology, 60(4), pp.569–582. DOI: http://doi.org/10.1111/j.1600-0889.2008.00367.x
  Published on 01 Jan 2008
 Accepted on 27 Apr 2008            Submitted on 8 Nov 2007

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