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首页> 外文期刊>Atmospheric chemistry and physics >Results from a new linear Osub3/sub scheme with embedded heterogeneous chemistry compared with the parent full-chemistry 3-D CTM
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Results from a new linear Osub3/sub scheme with embedded heterogeneous chemistry compared with the parent full-chemistry 3-D CTM

机译：与父全化学3-D CTM相比，采用嵌入式异质化学的新型线性O 3 方案的结果

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A detailed full-chemistry 3-D chemistry and transport model (CTM) is used to evaluatethe current stratospheric O3 parameterisation in the European Centre forMedium-Range Weather Forecasts (ECMWF) model and to obtain an alternativeversion of the ozone scheme implicitly including heterogeneous chemistry.The approach avoids the inaccurate treatment currently given toheterogeneous ozone chemistry in the ECMWF model, as well as theuncertainties of a cold-tracer.The new O3 scheme (COPCAT) is evaluated within the same CTM used to calculate it.It is the first time such a comparison has been possible, providing direct informationon the validity of the linear parameterisation approach for stratospheric ozone.Simulated total column and O3 profiles are compared against Total Ozone MappingSpectrometer (TOMS) and Halogen Occultation Experiment (HALOE) observations.COPCAT successfully simulates polar loss and reproduces arealistic Antarctic O3 hole.The new scheme is comparable to the full-chemistry in many regions for multiannual runs.The parameterisation produces less ozone over the tropics around 10 hPa, compared tofull-chemistry and observations. However, this problemcan be ameliorated by choosing a different ozone climatology for the scheme.The new scheme is compared to the current ECMWF scheme in the same CTM runs.The Antarctic O3 hole with the current ECMWF scheme is weaker and disappears earlierthan with the new COPCAT scheme.Differences between the current ECMWF scheme and COPCAT are difficult to explaindue to the different approach used for heterogeneous chemistryand differences in the photochemical models used tocalculate the scheme coefficients. Results with the new COPCAT schemepresented here show that heterogeneous andhomogeneous ozone chemistry can be included in a consistent way in a linearozone parameterisation, without any additional tunable parameters, providing aparameterisation scheme in better agreement with the current knowledge ofstratospheric O3 chemistry than previous approaches.
机译：详细的全化学3-D化学和运输模型（CTM）用于评估欧洲中距离天气预报中心（ECMWF）模型中当前的平流层O 3 参数化，并获得该方法避免了ECMWF模型中目前对异构臭氧化学的不正确处理以及冷示踪剂的不确定性。新的O 3 方案（COPCAT）是这是首次进行这种比较，首次提供了有关平流层臭氧线性参数化方法有效性的直接信息。模拟总色谱柱和O 3 剖面将其与总臭氧测图仪（TOMS）和卤素掩星实验（HALOE）的观测结果进行了比较。该方案可与许多地区多年运行的全化学方法相媲美。与全化学方法和观测值相比，参数化在10 hPa左右的热带地区产生的臭氧更少。但是，可以通过为该方案选择不同的臭氧气候来解决此问题。将该新方案与同一ECTM运行中的当前ECMWF方案进行比较。使用当前ECMWF方案的南极O 3 孔是由于采用了非均相化学方法的不同以及用于计算方案系数的光化学模型的差异，目前的ECMWF方案与COPCAT之间的差异难以解释。此处展示的新COPCAT方案的结果表明，可以在线性区参数化中以一致的方式包括非均质和均匀的臭氧化学，而无需任何其他可调参数，从而提供与当前平流层O 3 化学比以前的方法。

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