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首页> 外文期刊>Atmospheric chemistry and physics >Results from a new linear O_3 scheme with embedded heterogeneous chemistry compared with the parent full-chemistry 3-D CTM
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Results from a new linear O_3 scheme with embedded heterogeneous chemistry compared with the parent full-chemistry 3-D CTM

机译：与父级全化学3-D CTM相比，具有嵌入式异质化学的新线性O_3方案的结果

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摘要

A detailed full-chemistry 3-D chemistry and transport model (CTM) is used to evaluate the current stratospheric O3 parameterisation in the European Centre for Medium-Range Weather Forecasts (ECMWF) model and to obtain an alternative version of the ozone scheme implicitly including heterogeneous chemistry. The approach avoids the inaccurate treatment currently given to heterogeneous ozone chemistry in the ECMWF model, as well as the uncertainties of a cold-tracer. The new O_3 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 information on the validity of the linear parameterisation approach for stratospheric ozone. Simulated total column and O3 profiles are compared against Total Ozone Mapping Spectrometer (TOMS) and Halogen Occultation Experiment (HALOE) observations. COPCAT successfully simulates polar loss and reproduces a realistic Antarctic O 3 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 to full-chemistry and observations. However, this problem can 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 O_3 hole with the current ECMWF scheme is weaker and disappears earlier than with the new COPCAT scheme. Differences between the current ECMWF scheme and COPCAT are difficult to explain due to the different approach used for heterogeneous chemistry and differences in the photochemical models used to calculate the scheme coefficients. Results with the new COPCAT scheme presented here show that heterogeneous and homogeneous ozone chemistry can be included in a consistent way in a linear ozone parameterisation, without any additional tunable parameters, providing a parameterisation scheme in better agreement with the current knowledge of stratospheric O_3 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O3参数化，并隐含获得臭氧方案的替代版本，其中包括异构化学。该方法避免了ECMWF模型中当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O_3方案（COPCAT）在用于计算该方案的同一CTM中进行评估。这是首次进行这种比较，提供有关平流层臭氧线性参数化方法有效性的直接信息。将模拟的总色谱柱和O3剖面图与总臭氧谱图仪（TOMS）和卤素掩盖实验（HALOE）观察值进行比较。 COPCAT成功地模拟了极性损失并重现了逼真的南极O 3孔。这项新计划可与许多地区的多年化学全化学实验相媲美。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缓解此问题。在相同的CTM运行中，将新方案与当前ECMWF方案进行比较。与新的COPCAT方案相比，采用当前ECMWF方案的南极O_3孔更弱并且消失得更早。由于用于异构化学的方法不同以及用于计算方案系数的光化学模型的差异，当前ECMWF方案与COPCAT之间的差异很难解释。此处提出的新COPCAT方案的结果表明，线性臭氧参数化中可以以一致的方式包括非均相和均质臭氧化学，而无需任何其他可调参数，提供的参数化方案与平流层O_3化学的当前知识比以前的方法。

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