THE STRUCTURE DYNAMICS AND N2 VOLATILE CYCLE OF PLUTO IS POORLY UNDERSTOOD. A COMBINATION OF OBSERVATIONS (OCCULTATION LIGHT CURVES AND SPECTRAL SURFACE IMAGING) AND GENERAL CIRCULATION MODELING WILL BE USED TO ACHIEVE THE FOLLOWING OBJECTIVES AND RELATED QUESTIONS:1. QUANTIFY THE ATMOSPHERIC CIRCULATIONS NECESSARY TO MAINTAIN QUASI-VAPOR PRESSURE EQUILIBRIUM. HOW ARE MASS AND ENERGY TRANSPORTED TO AND FROM SUBLIMATION AND DEPOSITION REGIONS? WHAT IS THE RELATIVE CONTRIBUTION OF GLOBAL THERMAL CIRCULATIONS AND CONDENSATION FLOWS TO THE TOTAL CIRCULATION? WHAT IS THE DEPTH AND STRUCTURE OF THE LOWER ATMOSPHERIC CIRCULATION?2. QUANTIFY THE ENERGY PARTITION WITHIN THE ATMOSPHERE-SURFACE SYSTEM. WHAT FRACTION OF THE INSOLATION GOES INTO SUBLIMATION SURFACE STORAGE ATMOSPHERIC HEATING AND KINETIC ENERGY? HOW DOES THE HETEROGENEITY OF SURFACE PROPERTIES MODULATE THE ENERGY PARTITION AND THE ATMOSPHERIC CIRCULATION?3. TEST HYPOTHESES OF VOLATILE TRANSPORT AND ADDRESS OBSERVATIONAL INCONSISTENCIES. HOW CLOSE TO VAPOR PRESSURE EQUILIBRIUM IS THE ATMOSPHERE-SURFACE SYSTEM? IS ATMOSPHERIC TRANSPORT EFFECTIVELY INSTANTANEOUS WITH RESPECT TO EQUILIBRIUM VAPOR PRESSURE TIMESCALES? WHAT GLOBAL SURFACE PRESSURE DISTRIBUTIONS AND TRENDS ARE MOST CONSISTENT WITH OCCULTATION LIGHT CURVES? HOW LONGITUDINALLY SYMMETRIC IS THE GLOBAL ATMOSPHERIC CIRCULATION AND STRUCTURE?4. PROVIDE QUANTITATIVE GUIDANCE AND PREDICTIONS TO INFORM THE NEW HORIZON ENCOUNTER WITH PLUTO AND OTHER KBOS. HOW DO EXISTING ENCOUNTER PLANS MESH WITH PREDICTIONS? WHAT ANTICIPATED SPACECRAFT OBSERVATIONS CAN BE USED TO TEST THE MODEL. HOW CAN A MODEL HELP TO INTERPRET ANTICIPATED OBSERVATIONS?WITH THE PLUTO-BOUND NEW HORIZONS SPACECRAFT ON IT'S WAY AND WITH THE EXTRAORDINARY OCCULTATION DATA OF PLUTO FROM OVER THE LAST TWODECADES (AND MORE FORTHCOMING) THE DEVELOPMENT OF A MODELING TOOL CAPABLE OF SYNTHESIZING THE DATA IS RELEVANT TO NASA'S EXPLORATIONAND SCIENCE GOALS.