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Moving Forward with Imperfect Information 453Table 19.2 Knowledge gaps and key challenges to improving understanding, reducinguncertainty, identifying and addressing vulnerabilities to climate changesin the Southwest (Continued)ModelUncertaintyScenarioUncertaintyKnowledge Gaps Contributing to KeyChallengesObservational DataUnderstanding Physical Climate DynamicsClimate Models & DownscalingPhysical Climate Impacts to Biological &Human SystemsSocial & Behavioral FactorsEconomic FactorsPolicy & Regulatory FactorsCommunication & EducationChapter(s)Measurements of precipitation amountand typeXPresent Weather andClimate: Average Conditions(4)Present Weather andClimate: Evolving Conditions(5)Future Climate: ProjectedAverage (6)KEY CHALLENGE: There is limited understanding of the influence of climate change on natural variability(e.g. ENSO, PDO), extreme events (droughts, floods), and the marine layer along coastal California.Ability to connect climate change andextreme eventsX Human Health (15)Understanding of physical processessuch as atmospheric convection, evapotranspiration,snow pack formation, andrunoff productionConnections between modes of naturalvariability (ENSO and PDO) and climatechange; including effect on <strong>SW</strong> MonsoonOccurrence of compound high-impactextremes such as drought and heat wavesXXXPresent Weather andClimate: Evolving Conditions(5)Future Climate: ProjectedExtremes (7)Future Climate: ProjectedAverage (6)Water: Impacts, Risks, andAdaptation (10)Future Climate: ProjectedExtremes (7)Understanding of marine layer processes X Coastal Issues (9)

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