Satellite estimation of photosynthetically active radiation in Southeast Asia: Impacts of smoke and cloud cover

摘要: [1] Since large-scale variations in photosynthetically active radiation (PAR) influence the terrestrial carbon sources and sinks through plant photosynthesis variations, evaluation of PAR is required. In present study a simple estimation model was developed for Southeast Asia, where forest fires occurred during El Nino years. The considered smoke aerosol released by using satellite-based detection methods. A comparison with ground-based solar data Malaysia Thailand indicated that current could estimate monthly 10% (root-mean-square) accuracy would successfully trace seasonal year-to-year PAR, including fire periods. During peak-smoke month Indonesia, September 1997, reduction reached 63–75% center Kalimantan Sumatra Islands. From analyses cloud cover impacts on 1997–1999, annual were found to be mostly regulated Malay Peninsula, Sumatra, Islands Indo-China Peninsula. Thus changed location. These did not simply correlate associated La Nina cycle, but exhibited more complicated spatial due existence Asia.