Relational Metrics to Evaluate Chemistry-Transport and Chemistry-Climate Models

该项目将开发基于观测的指标，用于评估全球大气化学模型。这套指标将有助于气候模式的开发和规划IPCC第七次评估的下一个化学模式比对项目（MIP）。这项工作将记录下一代模型中的发展和改进，以及对政策相关模型预测的信心的可追溯性。将开发一套新的或修订的以气相化学为重点的指标，涉及高阶指标（例如，反应速率、预算、统计、物种协方差）和/或关系（例如，预算与扰动、季节/年际运输模式）。加州大学欧文分校（University of California at Irvine）的化学传输模型（CTM）和MIP档案将用于起草指标。要解决的科学问题包括：(1)化学成分的异质性；(2)对流层O3和CH4的化学收支；(3) CH4化学反馈和O3灵敏度；(4)对流层湿度，一个紧急约束；(5)从平流层到地面的N2O；(6)平流层柱臭氧；(7)对流层柱臭氧和气团；(8)光解速率和紧急约束；(9)空气质量指标O3。研究生将参与量度的设计、测试和文档编制。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project will develop observation-based metrics for evaluating global atmospheric chemistry models. This suite of metrics will assist with climate model development and planning for the next chemistry Model Intercomparison Project (MIP) for the 7th IPCC assessment. This effort will document the development and improvements occurring in next-generation models and the traceability of confidence in policy-relevant model projections. A new or revised set of metrics focused on gas-phase chemistry will be developed involving high-order metrics (e.g., reaction rates, budgets, statistics, covariance of species) and/or relationships (e.g., budgets vs. perturbations, seasonal/interannual patterns in transport). Chemical transport models (CTM) at the University of California at Irvine and MIP archives will be used to draft the metrics. Scientific issues to be addressed include: (1) heterogeneity in chemical composition; (2) chemical budgets of tropospheric O3 and CH4; (3) CH4 chemistry feedback and O3 sensitivities; (4) tropospheric humidity, an emergent constraint; (5) N2O from the stratosphere to the surface; (6) stratospheric column ozone; (7) tropospheric column ozone and air mass; (8) photolysis rates and emergent constraints; and (9) surface O3, an air quality metric.A graduate student will participate in the design, testing, and documentation of the metrics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.