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A methodology for the comparison of blocking climatologies across indices, models and climate scenarios

机译:跨指标,模型和气候情景的比较封闭气候的方法

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摘要

There is urgent need for a consistent blocking identification method that can be used and compared across reanalyses, models and climate scenarios. We present such a method and diagnose daily blocking frequency in 43 years (1958-2000) of ERA-40 Reanalysis for indices defined on both the commonly used geopotential height and potential temperature fields as well as a zonal wind index. Applications of various blocking indices to the same data highlights the importance of a consistent methodology for comparison and a method that identifies blocks along a path that varies with the latitude of the storm track. Since the method accommodates blocking detection using 500 mb zonal-wind which is readily available in climate model output, we diagnose blocking in 14 CMIP3 models under two different greenhouse gas scenarios. Blocking duration remains nearly constant among the scenarios, but a robust reduction in blocking frequency with global warming is demonstrated.
机译:迫切需要一种可以在重新分析,模型和气候情景中使用和比较的一致的阻塞识别方法。我们提出了这样一种方法,并通过对ERA-40再分析的43年(1958-2000年)中的日常阻塞频率进行了诊断,以确定在常用地势高度和势能温度场以及纬向风指数上均定义的指标。将各种阻塞指数应用于同一数据,突显了一致的比较方法和识别沿风暴路径纬度变化的路径上的块的方法的重要性。由于该方法可以使用气候模型输出中容易获得的500 mb纬向风进行阻塞检测,因此我们在两种不同的温室气体情景下诊断了14种CMIP3模型中的阻塞。在各种情况下,阻塞持续时间几乎保持不变,但是随着全球变暖,阻塞频率显着降低。

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