環境科学院 植物生態学セミナー   2011-07-29 (Fri) 13:00
(Room: A809 )

The recent field campaign for peat water sample collection in Central Kalimantan

Yan Gao
(Chairperson: ==CHAIRPERSON==)
Peat water has high carbon content. The measurement of carbon in peat water is important to complete the full carbon cycle in peat land ecosystem. The content of dissolved organic carbon (DOC) is highly related to the concentration of colored dissolved organic matter (CDOM). Thus DOC in peat water system can be estimated through the measurement of CDOM concentration. Remote sensing has been used to provide the measurement of DOC over large geographic region by mapping CDOM. However, most of these researches used only multispectral satellite images for inland water systems such as lakes and caves (Kutser et al. 2005; Birdwell, et al, 2010). Hyperspectral satellite images have the characteristics of observing ground surface through many continuous, contiguous and narrow spectral bands, providing detailed spectral information of ground surface objects and can be applied to differentiate vegetation species and detect mineral components. For this research, we apply hyperspectral satellite images in peat water system for CDOM detection. For this purpose, Hymap satellite image data were acquired at the time of the in situ measurement. Hymap has 126 spectral bands in 10nm for covering the wavelength of 450 – 2500nm. Peat water samples were collected simultaneously from 13 sample sites. For each sample site, measurements such as water depth, PH, temperature, TDS (total dissolved solid), sample site coordinates etc. were recorded. From the collected water samples, the DOC and CDOM concentration is analyzed from the lab. In order to decide the optimal CDOM absorption wavelength, CDOM absorption at various wavelengths was tested. The measured CDOM absorption was correlated with the band ratio (550nm/661nm) of Hymap satellite images.
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