A Parameterization of Convective Dust Storms for Models with Mass-Flux Convection Schemes
A Parameterization of Convective Dust Storms for Models with Mass-Flux Convection Schemes
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DOI：
10.1175/jas-d-14-0341.1
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发表时间：
2015-04
影响因子：
3.1
通讯作者：
Florian Pantillon;P. Knippertz;J. Marsham;C. Birch
中科院分区：
文献类型：
--
作者：
Florian Pantillon;P. Knippertz;J. Marsham;C. Birch
由湿对流下沉气流产生的冷池外流可以产生强风，从而抬升矿物粉尘。这些所谓的Habob对流沙尘暴发生在全世界所有主要的沙尘源地区，对世界上最大的沙尘源--北非的排放有很大贡献。大多数大尺度模式缺乏对流沙尘暴，因为它们不解决湿对流，而是依赖对流方案。作者建议用对流沙尘暴的参数化来解释它们在这种大尺度模式中的贡献。参数化是基于一个简单的概念模式，在该模式中，来自对流方案的下沉气流质量通量在圆柱形冷池中径向扩散。用2006年6月和7月在西非上空运行的一套Met Office统一模式对该参数化进行了测试。它用允许对流的管路进行了校准，并应用于对流参数管路。参数化成功地生成了Ext..。
AbstractCold pool outflows, generated by downdrafts from moist convection, can generate strong winds and therefore uplift of mineral dust. These so-called haboob convective dust storms occur over all major dust source areas worldwide and contribute substantially to emissions in northern Africa, the world’s largest source. Most large-scale models lack convective dust storms because they do not resolve moist convection, relying instead on convection schemes. The authors suggest a parameterization of convective dust storms to account for their contribution in such large-scale models. The parameterization is based on a simple conceptual model, in which the downdraft mass flux from the convection scheme spreads out radially in a cylindrical cold pool. The parameterization is tested with a set of Met Office Unified Model runs for June and July 2006 over West Africa. It is calibrated with a convection-permitting run and applied to a convection-parameterized run. The parameterization successfully produces the ext...