설마천 유역 CO₂ Flux 실측 자료에 의한 총일차생산성 (GPP)과 MODIS GPP간의 비교 평가
Evaluation of MODIS Gross Primary Production (GPP) by Comparing with GPP from CO₂Flux Data Measured in a Mixed Forest Area
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참고문헌
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초록
In this study, In order to evaluate reliable of MODIS GPP, the MODIS GPP and Flux tower measured GPP were compared to evaluate the use of method on 8 days composite MODIS GPP. The 2008 Flux data (CO₂Flux and air temperature) measured in Seolmacheon watershed (8.48 ㎢) were used. The Flux tower GPP was estimated as the sum of CO₂Flux and Re(ecosystem respiration) by Lloyd and Taylor method (1994). The summer Monsoon period from June to August mostly contributed the underestimation of MODIS GPP by cloud contamination on MODIS pixels. The 2008 MODIS GPP and Flux tower GPP of the watershed were 1133.2 g/m2/year and 1464.3 g/m2/year respectively and the determination coefficient (R2) after correction of cloud-originated errors was 0.74 (0.63 before correction). Even though effect of Cloud-Originated Errors was eliminated, Solar radiation and Temperature are affected at GPP. Measurement of correct GPP is difficult. But, If errors of MODIS GPP analyze on Cloud Moonsoon Climate in korea and eliminated effect of Cloud-Originated Errors, MODIS GPP will be considered GPP increasing of 9 %. There, Our results indicate that MODIS GPP show reliable and useful data except for summer period in Moonsoon Climate.
Abstract
In this study, In order to evaluate reliable of MODIS GPP, the MODIS GPP and Flux tower measured GPP were compared to evaluate the use of method on 8 days composite MODIS GPP. The 2008 Flux data (CO₂Flux and air temperature) measured in Seolmacheon watershed (8.48 ㎢) were used. The Flux tower GPP was estimated as the sum of CO₂Flux and Re(ecosystem respiration) by Lloyd and Taylor method (1994). The summer Monsoon period from June to August mostly contributed the underestimation of MODIS GPP by cloud contamination on MODIS pixels. The 2008 MODIS GPP and Flux tower GPP of the watershed were 1133.2 g/m2/year and 1464.3 g/m2/year respectively and the determination coefficient (R2) after correction of cloud-originated errors was 0.74 (0.63 before correction). Even though effect of Cloud-Originated Errors was eliminated, Solar radiation and Temperature are affected at GPP. Measurement of correct GPP is difficult. But, If errors of MODIS GPP analyze on Cloud Moonsoon Climate in korea and eliminated effect of Cloud-Originated Errors, MODIS GPP will be considered GPP increasing of 9 %. There, Our results indicate that MODIS GPP show reliable and useful data except for summer period in Moonsoon Climate.
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