Tracer Transport in Deep Convective Updrafts: Plume Ensemble versus Bulk Formulations
Tracer Transport in Deep Convective Updrafts: Plume Ensemble versus Bulk Formulations
复制标题
深对流上升气流中的示踪剂传输：羽流集合与散装制剂
DOI：
10.1175/jas3505.1
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发表时间：
2005
影响因子：
3.1
通讯作者：
P. Rasch
中科院分区：
文献类型：
--
作者：
M. Lawrence;P. Rasch
摘要基于对流质量通量的示踪剂输运参数化的两种常用方法是羽流集合公式（PEF）和整体公式（BF）。在这里，这两个的行为进行了对比的特定情况下，BF的空气质量通量导出作为一个直接简化的显式PEF。相对于PEF，BF有一个更大的率夹带对流层中部的空气进入包裹，达到最高的高度，因此预计计算效率较低的运输表层示踪剂的对流层上部。在这项研究中，这种差异是量化使用一种新的算法计算质量守恒，单调示踪剂运输的BF和PEF，沿着的技术分解成一组一致的，离散的羽流中使用的PEF散装质量通量分布。与三维全球化学输运模型（MATCH）的拟合表明，BF可能是大多数示踪剂的寿命为一周或更长的一个足够的近似。
Abstract Two widely used approaches for parameterizing tracer transport based on convective mass fluxes are the plume ensemble formulation (PEF) and the bulk formulation (BF). Here the behavior of these two is contrasted for the specific case in which the BF airmass fluxes are derived as a direct simplification of an explicit PEF. Relative to the PEF, the BF has a greater rate of entrainment of midtropospheric air into the parcels that reach the highest altitudes, and thus is expected to compute less efficient transport of surface-layer tracers to the upper troposphere. In this study, this difference is quantified using a new algorithm for computing mass conserving, monotonic tracer transport for both the BF and PEF, along with a technique for decomposing a bulk mass flux profile into a set of consistent, discrete plumes for use in the PEF. Runs with a 3D global chemistry transport model (MATCH) show that the BF is likely to be an adequate approximation for most tracers with lifetimes of a week or longer....