...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric chemistry and physics >Evaluation of the atmospheric transport in a GCM using radon measurements: sensitivity to cumulus convection parameterization
【24h】

Evaluation of the atmospheric transport in a GCM using radon measurements: sensitivity to cumulus convection parameterization

机译：使用ra测量评估GCM中的大气迁移：对积云对流参数化的敏感性

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The radioactive species radon (222Rn) has long been used as atest tracer for the numerical simulation of large scale transportprocesses. In this study, radon transport experiments are carriedout using an atmospheric GCM with a finite-difference dynamicalcore, the van Leer type FFSL advection algorithm, and twostate-of-the-art cumulus convection parameterization schemes.Measurements of surface concentration and vertical distribution ofradon collected from the literature are used as references in modelevaluation.The simulated radon concentrations using both convection schemesturn out to be consistent with earlier studies with many othermodels. Comparison with measurements indicates that at the locationswhere significant seasonal variations are observed in reality, themodel can reproduce both the monthly mean surface radonconcentration and the annual cycle quite well. At those sites wherethe seasonal variation is not large, the model is able to give acorrect magnitude of the annual mean. In East Asia, where radonsimulations are rarely reported in the literature, detailed analysisshows that our results compare reasonably well with theobservations.The most evident changes caused by the use of a different convectionscheme are found in the vertical distribution of the tracer. Thescheme associated with weaker upward transport gives higher radonconcentration up to about 6 km above the surface, and lower valuesin higher altitudes. In the lower part of the atmosphere resultsfrom this scheme does not agree as well with the measurements as theother scheme. Differences from 6 km to the model top are evenlarger, although we are not yet able to tell which simulation isbetter due to the lack of observations at such high altitudes.
机译：放射性物种ra（ 222 Rn）长期以来一直被用作大规模传输过程数值模拟的测试示踪剂。在这项研究中，使用具有有限差分动力学核的大气GCM，van Leer型FFSL对流算法和两种最先进的积云对流参数化方案进行ra传输实验。收集的collected的表面浓度和垂直分布的测量来自文献的文献被用作模型评估的参考。 使用两种对流方案模拟的ra浓度与许多其他模型的早期研究一致。与测量值的比较表明，在实际观测到明显季节性变化的位置，该模型可以很好地再现月平均表面ra浓度和年周期。在那些季节变化不大的地点，该模型能够给出正确的年均值幅度。在东亚，文献中很少有ra模拟的报道，详细分析表明，我们的结果与观测值相当合理。 使用不同对流方案引起的最明显变化是在垂直方向上发现的。示踪剂。与较弱的向上迁移有关的方案会在距地面约6 km处产生较高的ra浓度，而在较高的海拔高度则较低。在大气的下部，该方案的结果与其他方案的测量结果也不尽相同。从6 km到模型顶部的差异甚至更大，尽管由于在如此高的海拔上缺乏观测，我们尚无法确定哪种模拟更好。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号