Analyzing a relationship between climate change and terrestrial carbon fluxes over Japan area

Recently, terrestrial vegetation undergoes dramatic change in climate. Areal difference of climate change has been gradually large, and ecosystem differ in response to climate change, leading that terrestrial carbon exchange between atmosphere and biosphere has also undergone much change for each region. A purpose of this study is to examine a relationship between climate parameter and terrestrial carbon flux over Japan region. The carbon flux data used are GPP, NPP, and NEP at 1km grid resolution, they were estimated by the satellite-driven biosphere model, BEAMS. The climate data are the MODIS land products and NCEP/NCAR re-analysis data set. We calculated annual and seasonal anomalies, and correlation coefficient between climate parameters and carbon fluxes from 2001 to 2010. The study area is Japan region (125°-150°E, 30°-50°N). We found in inter-annual change anomalies that NEP plays a role of sizable carbon sink in 2004 and 2007, and carbon source in 2003 and 2006. In 2004 and 2007, as full-year air temperature is high, an end of plant growing season might be delayed. In 2003 and 2006, low solar radiation due to rainy season front decreases NEP. By analyzing a relationship between climate parameters and carbon fluxes for each region, we could understand a characteristic of climate change and ecosystem, and a mechanism of terrestrial carbon cycle.