Data assimilation of stratospheric constituents: a review

[摘要] The data assimilation of stratospheric constituents is reviewed. Several dataassimilation methods are introduced, with particular consideration to theirapplication to stratospheric constituent measurements. Differences frommeteorological data assimilation are outlined. Historically, two approacheshave been used to carry out constituent assimilation. One approach hascarried constituent assimilation out as part of a Numerical WeatherPrediction system; the other has carried it out in a standalone chemicalmodel, often with a more sophisticated representation of chemical processes.Whereas the aim of the Numerical Weather Prediction approach has been toimprove weather forecasts, the aims of the chemical model approach haveincluded providing chemical forecasts and analyses of chemical constituents.A range of constituent assimilation systems developed in these two areas ispresented and strengths and weaknesses discussed. The use of stratosphericconstituent data assimilation to evaluate models, observations and analyses,and to provide analyses of constituents, monitor ozone, and make ozoneforecasts is discussed. Finally, the current state of affairs is assessed,future directions are discussed, and potential key drivers identified.

[学科分类] 大气科学