Multiscale Interaction between Deep Convection, African Easterly Waves, and Kelvin Waves over the Atlantic, Africa and the Indian Ocean

大西洋、非洲和印度洋上空的深对流、非洲东波和开尔文波之间的多尺度相互作用

基本信息

项目摘要

This project focuses on an investigation of the multiscale interaction between African easterly waves (AEWs), Kelvin waves and different types of deep convection over the Atlantic Ocean, Africa and the Indian Ocean. The effort will focus on three research areas: (i) the initiation of AEWs and their role on convective activity, (ii) the impact of different types of deep convection on maintenance, structure and propagation characteristics of AEWs, and (iii) the Kelvin wave variability, including its interaction with AEWs. A novel way of investigating wave-convection interactions and presenting comprehensive analysis of different types of deep convection will be studied. Heretofore-unrecognized changes in convective system organization, i.e., switching of one type of deep convection to another, will be identified as playing a key role in initiating wave activity. The plan includes use of multiple datasets: satellite-based observations from the International Satellite Cloud Climatology Project, Tropical Rainfall Measuring Mission Multi-satellite Precipitation Analysis, and high-resolution reanalysis data. The following key scientific questions will be addressed: (1) How does one type of deep convection transition to another type? What are the mechanisms that determine this transition? What is the role of diurnal cycle and high terrain in the transition process? (2) How do AEWs and associated convection vary across regions of high terrain in Africa? How does AEW-genesis vary in time? What is the impact of MCSs on AEWs? (3) How do Kelvin waves interact with AEWs and what determines this interaction? (4) What is the role of Kelvin wave activity on different types of deep convection?The proposal has also important educational impacts. This research will help increase the involvement of students from underrepresented groups and will enhance the graduate atmospheric science program at North Carolina A&T State University, a minority serving institution.
该项目的重点是调查非洲东风波(AEWs),开尔文波和大西洋,非洲和印度洋上空不同类型的深对流之间的多尺度相互作用。这项工作将集中在三个研究领域:(一)AEW的启动及其对对流活动的作用,(二)不同类型的深对流对AEW的维持,结构和传播特性的影响,以及(三)开尔文波的变化,包括其与AEW的相互作用。将研究一种新的方法来调查波-对流相互作用,并对不同类型的深对流进行综合分析。对流系统组织的迄今未被认识的变化,即,一种类型的深对流向另一种类型的切换将被认为在引发波活动方面发挥着关键作用。该计划包括使用多种数据集:国际卫星云气候学项目的卫星观测、热带降雨测量使命多卫星降水分析和高分辨率再分析数据。将解决以下关键科学问题:(1)一种类型的深对流如何转变为另一种类型?决定这种转变的机制是什么?日变化和高地形在转变过程中的作用是什么?(2)在非洲的高地地区,AEW和相关的对流是如何变化的?AEW成因如何随时间变化?MCS对AEW有什么影响?(3)Kelvin波如何与AEW相互作用,是什么决定了这种相互作用?(4)开尔文波活动对不同类型的深对流有何作用?该提案也具有重要的教育影响。这项研究将有助于增加来自代表性不足群体的学生的参与,并将加强北卡罗来纳州AT州立大学的研究生大气科学计划,这是一个少数民族服务机构。

项目成果

期刊论文数量(0)
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Ademe Mekonnen其他文献

On mechanisms that determine synoptic time scale convection over East Africa
东非天气时间尺度对流的确定机制
Tropical Precipitation Extremes
热带极端降水
  • DOI:
    10.1175/jcli-d-11-00725.1
  • 发表时间:
    2013
  • 期刊:
  • 影响因子:
    4.9
  • 作者:
    W. Rossow;Ademe Mekonnen;C. Pearl;W. Gonçalves
  • 通讯作者:
    W. Gonçalves
The Interaction Between Deep Convection and Easterly Waves over Tropical North Africa: A Weather State Perspective
北非热带地区深对流与东风波之间的相互作用:天气状态视角
  • DOI:
    10.1175/2011jcli3900.1
  • 发表时间:
    2011
  • 期刊:
  • 影响因子:
    4.9
  • 作者:
    Ademe Mekonnen;W. Rossow
  • 通讯作者:
    W. Rossow
The Impact of Kelvin Wave Activity during Dry and Wet African Summer Rainfall Years
非洲夏季降雨干湿年期间开尔文波活动的影响
  • DOI:
    10.3390/atmos11060568
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    2.9
  • 作者:
    Ademe Mekonnen;C. Schreck;B. Enyew
  • 通讯作者:
    B. Enyew
The Interaction between Deep Convection and Easterly Wave Activity over Africa: Convective Transitions and Mechanisms
非洲上空深层对流与东波活动的相互作用:对流转变和机制
  • DOI:
    10.1175/mwr-d-17-0217.1
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    3.2
  • 作者:
    Ademe Mekonnen;W. Rossow
  • 通讯作者:
    W. Rossow

Ademe Mekonnen的其他文献

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