한반도에서의 전천일사량을 이용한 광합성유효복사량 추정 모델 개발 및 검증
Development of an Empirical Model for Photosynthetically Active Radiation using Global Horizontal Irradiance in Korea
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초록
Photosynthetically active radiation (PAR; wavelength 400 ~ 700 nm) is the spectral range ofsolar radiation used by plants for photosynthesis. PAR data are used in various fields ofresearch, such as that focusing on surface vegetation growth, the light energy–chemical energyconversion process, and the terrestrial carbon cycle. In this study, we analyze the variabilitybetween Global Horizontal Irradiance (GHI) and PAR according to the solar zenith angle, theclearness index, using GHI and PAR observations from 2016 to 2020 at Anmyeondo FluxTower of Korea Forest Research Institute (KFRI). We confirm that the PAR decreases and thevariability of the ratio of PAR to GHI increases as the atmospheric optical path increases. Wealso confirmed that the PAR increased and the ratio of PAR and GHI decreased as the clearnessindex increased. Using the results of these relationships and prior studies, we develop andevaluate empirical models that estimate PAR from GHI. The R2representing the estimationaccuracy of the model was 0.988 to 0.996, indicating very high accuracy. With these results, theobservation data from the KFRI’s Wando, Pyeongchang, and Samcheok Flux Towers during thesame period showed that R2was very high at 0.977 ~ 0.988, confirming its transferability inother regions. Despite the high R2, the Mean Bias Error (MBE) for each site was shown to bedifferent. To solve this problem, a model with relative humidity and temperature was developedto apply regional conditions for each site, and showed similar R2to prior models with less MBE. It is expected that the results of this study will be used as policy references such as attractingsolar power complexes by drawing up a seasonal map of the Korean peninsula of PAR withsolar radiation data observed at the Korea Meteorological Administration's Automated SynopticObserving System (ASOS).
Abstract
Photosynthetically active radiation (PAR; wavelength 400 ~ 700 nm) is the spectral range ofsolar radiation used by plants for photosynthesis. PAR data are used in various fields ofresearch, such as that focusing on surface vegetation growth, the light energy–chemical energyconversion process, and the terrestrial carbon cycle. In this study, we analyze the variabilitybetween Global Horizontal Irradiance (GHI) and PAR according to the solar zenith angle, theclearness index, using GHI and PAR observations from 2016 to 2020 at Anmyeondo FluxTower of Korea Forest Research Institute (KFRI). We confirm that the PAR decreases and thevariability of the ratio of PAR to GHI increases as the atmospheric optical path increases. Wealso confirmed that the PAR increased and the ratio of PAR and GHI decreased as the clearnessindex increased. Using the results of these relationships and prior studies, we develop andevaluate empirical models that estimate PAR from GHI. The R2representing the estimationaccuracy of the model was 0.988 to 0.996, indicating very high accuracy. With these results, theobservation data from the KFRI’s Wando, Pyeongchang, and Samcheok Flux Towers during thesame period showed that R2was very high at 0.977 ~ 0.988, confirming its transferability inother regions. Despite the high R2, the Mean Bias Error (MBE) for each site was shown to bedifferent. To solve this problem, a model with relative humidity and temperature was developedto apply regional conditions for each site, and showed similar R2to prior models with less MBE. It is expected that the results of this study will be used as policy references such as attractingsolar power complexes by drawing up a seasonal map of the Korean peninsula of PAR withsolar radiation data observed at the Korea Meteorological Administration's Automated SynopticObserving System (ASOS).
참고문헌 (18)
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