Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 2 2010 10.5194/bg-7-641-2010 http://www.biogeosciences.net/7/641/2010/ http://www.biogeosciences.net/7/641/2010/bg-7-641-2010.html http://www.biogeosciences.net/7/641/2010/bg-7-641-2010.pdf 641 655 2010-02-15 Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia N. Saigusa n.saigusa@nies.go.jp K. Ichii H. Murakami R. Hirata J. Asanuma H. Den S.-J. Han R. Ide S.-G. Li T. Ohta T. Sasai S.-Q. Wang G.-R. Yu Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan Faculty of Symbiotic Systems Science, Fukushima University, Fukushima 960-1296, Japan Earth Observation Research Center, Japan Aerospace Exploration Agency, Tsukuba 305-8505, Japan Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan Terrestrial Environment Research Center, University of Tsukuba, Tsukuba 305-8577, Japan Academic Express, Inc., Tsukuba 305-0035, Japan Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Key Lab of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan Northern Eurasia experienced anomalous weather conditions in the 2003 summer. We examined how forest ecosystems responded to the meteorological anomalies during the period using the dataset collected at flux monitoring sites in Asia, including a boreal forest in Mongolia, temperate forests in China and Japan, and a sub-tropical forest in China, as well as the dataset from satellite remote sensing. From July to August 2003, an active rain band stayed in the mid-latitude in East Asia for an unusually long period. Under the influence of the rain band, the Gross Primary Production (GPP), of temperate forests was 20–30% lower in the 2003 summer than in other years due to significant reduction in the Photosynthetic Photon Flux Density (PPFD). The GPP of a cool-temperate forest in the north of the rain band was slightly enhanced by the higher PPFD; however, the GPP of a sub-tropical forest located in the south of the rain band was reduced by drought stress due to extremely hot and dry conditions. 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