B22C-06
Impact of meteorological anomalies in 2003 and 2010 summer on terrestrial carbon cycle in East Asia: Multi model and data analysis
Kazuhito Ichii¹, Masayuki Kondo¹, Kazuho Takahashi¹, Takashi Suzuki¹, Takahiro Sasai², Masahito Ueyama³, Nobuko Saigusa⁴
1. Fukushima University, Fukushima, Japan, 2. Nagoya University, Nagoya, Japan, 3. Osaka Prefecture University, Sakai, Japan, 4. National Institute of Environment Studies, Tsukuba, Japan

In East Asia, summers in 2003 and 2010 are characterized as years of contrasting climate anomalies with cool and wet (low temperature and radiation, high precipitation) in 2003 and hot and dry (high temperature and radiation, low precipitation) in 2010. Therefore, to detect the effect of the contrasting climate anomaly events on terrestrial carbon cycle, explore its causes, and test performances of the terrestrial biosphere models are important issues. Using multiple terrestrial ecosystem models (covering from empirical model to prognostic models) and data sources (eddy covariance observations, satellite observations, and atmospheric inversion models), we analyzed the relationship between climate and carbon cycle anomalies in 2003 and 2010 summer in East Asia. First, climate anomalies in these two years are quantified using available data sets. Second, from the satellite based observations and eddy-covariance observations, we detected the related terrestrial vegetation anomalies. For example, in 2003 summer, wide regions where shows low temperature and radiation anomalies show negative carbon uptake anomalies. However, in some dry regions, the low temperature and radiation are beneficial for vegetations since these regions are water-limited. On the other hand, in 2010 summer, only very small regions show carbon balance anomalies in humid regions. In dry regions, distinct negative anomalies in terrestrial carbon budget are detected responding to high temperature, radiation and low precitation.. Third, we compared and evaluated multiple terrestrial ecosystem models with above-mentioned observations. Basically, some models show similar patterns of interannual variations in carbon budget with more distinct differences in magnitude and others show very diverse patterns in terrestrial carbon budget which is caused by the overestimation of water stress on photosynthesis.. The differences are mainly come from the degree of sensitivity of terrestrial carbon cycle to soil water availability. This study is helpful to not only understand terrestrial carbon budget mechanisms but also provides a new opportunity to test the model under radiation anomalies, which water stress and radiation stress are competitive.
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