Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-20-0024.1 |
The Nontraditional Coriolis Terms and Tropical Convective Clouds | |
Igel, Matthew R.; Biello, Joseph A. | |
2020-12-01 | |
发表期刊 | Journal of the Atmospheric Sciences
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出版年 | 2020 |
英文摘要 | The full, three-dimensional Coriolis force includes the familiar sine-of-latitude terms as well as frequently dropped cosine-of-latitude terms [nontraditional Coriolis terms (NCT)]. The latter are often ignored because they couple the zonal and vertical momentum equations that in the large-scale limit of weak vertical velocity are considered insignificant almost everywhere. Here, we ask whether equatorial mesoscale clouds that fall outside the large-scale limit are affected by the NCT. A simple scaling indicates that a Lagrangian parcel convecting at 10 m s−1 through the depth of the troposphere should be deflected over 2 km to the west. To understand the real impact of NCT, we develop a mathematical framework that describes an azimuthally symmetric convective circulation with an analytical expression for an incompressible poloidal flow. Because the model incorporates the full three-dimensional flow associated with convection, it uniquely predicts not only the westward tilt of clouds but also a meridional diffluence of western cloud outflow. To test these predictions, we perform a set of cloud-resolving simulations whose results show preferential lifting of surface parcels with positive zonal momentum and zonal asymmetry in convective strength. RCE simulations show changes to the organization of coherent precipitation regions and a decrease in mean convective intensity of approximately 2 m s−1 above the freezing level. An additional pair of dry cloud-resolving simulations designed to mimic the steady-state flow of the model show maximum perturbations to the upper-level zonal flow of 8 m s−1. Together, the numerical and analytic results suggest the NCT consequentially alter equatorial mesoscale convective circulations and should be considered in conceptual models. |
领域 | 地球科学 ; 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/303962 |
专题 | 地球科学 气候变化 |
推荐引用方式 GB/T 7714 | Igel, Matthew R.,Biello, Joseph A.. The Nontraditional Coriolis Terms and Tropical Convective Clouds[J]. Journal of the Atmospheric Sciences,2020. |
APA | Igel, Matthew R.,&Biello, Joseph A..(2020).The Nontraditional Coriolis Terms and Tropical Convective Clouds.Journal of the Atmospheric Sciences. |
MLA | Igel, Matthew R.,et al."The Nontraditional Coriolis Terms and Tropical Convective Clouds".Journal of the Atmospheric Sciences (2020). |
条目包含的文件 | 条目无相关文件。 |
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