Tropical Precipitation-Carbon Cycle Links in CMIP5 Earth System Models

Tuesday, December 15, 2015 - 08:00
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Semi-arid ecosystems are increasingly thought to account for a large percentage of interannual variability in land CO2. To better inform future projections of carbon balance in earth system models (ESMs), we used a set of Coupled Model Intercomparison Project (CMIP5) ESMs to investigate trends and partitioning of recent CO2 uptake (1980-2005) from tropical and subtropical regions. We quantified model-to-model differences in net biome productivity (NBP) over semi-arid and tropical regions as well as the sensitivity of NBP to temperature and drought stress for each landcover type. Our results revealed a large spread in NBP among models and between regions. We compared our findings to reanalysis and in situ observations to develop benchmarks for global models and to further probe model-driver relationships in order to constrain long-term projections.