Analysis of Surface Moisture Status and Phenology in Thailand Using NOAA/AVHRR.
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概要
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We analyzed the time response of land surface moisture status and phenology to monitor land surface between the rainy and dry seasons in Thailand. In this study, we used global land 1-km AVHRR data set provided by U.S. Geological Survey (USGS) and meteorological stations data produced by the NCDC (National Climate Data Center). Normalized Difference Vegetation Index (NDVI) derived from multi-temporal AVHRR gave us information about phenology for broad regions. Surface moisture status was represented by the relationship between vegetation index (VI) and surface temperature (Ts) (VI-Ts method). We carried out intercomparisons of the seasonal changes in amount of rainfall, surface moisture status, and NDVI. Consequently, in a transition period from dry to rainy season, we identified time lags among the start of rainy season (124±21 Day of Year [DOY]), surface moisture status (123±53 DOY), and the onset of phenology. From dry to wet in surface moisture status, a noticeable time lag anticipated from the difference of land cover types was not detected, while time lag was found in the onset of phenology in forest (153±43 DOY) and cropland (170±46 DOY). On the other hand, in the transition period from rainy to dry, the time difference in the change of NDVI between forests and crop was noticeable. NDVI in croplands changed rapidly after the dry seasons started, while NDVI in forest changed according to the decrease in the surface moisture status shortly afterwards.
- 水文・水資源学会の論文
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