Western Regional Breakout Goal: Regional C budgets for natural and managed lands and anthropogenic emissions – Forests dominant in north while agriculture and fossil fuel CO 2 emissions dominant in South Hypotheses: – Forest source/sinks vary with disturbance a major factor – Pasture/range largely neutral but climate sensitive – Agricultural activities dominated by large carbon exports, uncertain C storage, non-CO 2 gases

Current activities: Bottom up: –Evaluation of model uncertainty in forest carbon exchange NASA-CASA, BIOM-BGC, MC1, CLM-CN –Summation of comparison of fossil fuel CO 2 estimates (VULCAN, CARB, EIA) –Evaluation of Forest Disturbance TM-based through (Bob Kennedy) BIOMBGC - MTBS (USGS) -fire, cutting –Inclusion of state inventories for non-CO 2 gases Top-down: –Tower data limited before 2006: Trinidad, Scripps –ORCA (2006), CALGEM (2007) –non-CO 2 synthesis project and state efforts

Future (unfunded) Topics ffCO 2 uncertainty: 14 CO 2 measurements Evaluation of river discharge to costal zone (%? NPP) Pest specific disturbance studies (Pine beetle) Prediction ? (thinning, fire frequency) Agriculture diagnosis –Carbon export in crops, residue management –Non-CO2 gas focus (N2O: N-addition CH 4 :livestock) Suggestion: Leverage state-funded activities –California AB-32 mandated GHG reductions require verification