Vertical profiles and storage fluxes of CO2, heat and water in a tropical rainforest at Pasoh, Peninsular Malaysia |
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| Authors: | SHINJIRO OHKUBO YOSHIKO KOSUGI SATORU TAKANASHI NAOKO MATSUO MAKOTO TANI ABDUL RAHIM NIK |
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| Institution: | Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan;;Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan;;Faculty of Bioresources, Mie University, Tsu, Mie 514-8507, Japan;;Forest Research Institute Malaysia, Kepong, Kuala Lumpur 52109, Malaysia |
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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 ( S c; μmol m?2 s?1) and sensible and latent heat storage fluxes ( Q a and Q w; 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 S c and Q a 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 S c in the tropical rainforest, probably mainly due to the difference in nighttime friction velocity at the sites. On the other hand, differences in Q a and Q w were smaller than the difference in S c, probably because of the smaller nighttime sinks/sources of heat and water vapour. |
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