Ship and Island Based Radar Observations in the Dynamics of the Madden-Julian Oscillation Project (DYNAMO)

马登-朱利安振荡项目 (DYNAMO) 动力学中的船基和岛基雷达观测

• 批准号: 1063928
• 负责人: Steven Rutledge
• 金额: $ 117.19万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-05-01 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1063928&HistoricalAwards=false
• 关键词: Ship; Island; Based; Radar; Observations

The Dynamics of the Madden-Julian Oscillation (DYNAMO) field campaign is the US component of an international experiment in late 2011/early 2012 in the Indian Ocean, the Cooperative Indian Ocean Experiment on Intraseasonal Variability (CINDY2011). The overarching goal of DYNAMO is to expedite understanding of processes key to MJO initiation over the Indian Ocean and to improve simulation and prediction of the MJO. The field campaign will include multiple radars, atmospheric sounding sites, a research aircraft, multiple research vessels, and oceanic measurements. The three main hypotheses of DYNAMO are: 1) Deep convection can be organized into an MJO convective envelope only when the moist layer has become sufficiently deep over a region of the MJO scale; the pace at which this moistening occurs determines the duration of the pre-onset state, 2) Specific convective populations at different stages are essential to MJO initiation, and 3) The barrier layer, wind- and shear-driven mixing, shallow thermocline, and mixing-layer entrainment all play essential roles in MJO initiation in the Indian Ocean by controlling the upper-ocean heat content and SST, and thereby surface flux feedbackUnder this award a C-band Doppler radar will be deployed on the research ship, R/V Roger Revelle. The radar will be one of several participating in DYNAMO. Collectively the radars will monitor and characterize precipitating convection associated with MJO initiation. The radar data will be used to diagnose heating profiles -- the mechanism by which deep convection contributes to large scale forcing. The radar observations also will be used to validate large scale and cloud resolving model simulations of the MJO.Specifically, the PI will investigate issues relative to improving predication of theMJO initiation including:* Understanding the relationship between convective development and moistening of the atmosphere.* Characterizing the detailed nature of convection over the tropical Indian Ocean and how convective and stratiform precipitation contribute to diabatic heating.* Validation of large scale and cloud resolving models.The broader impacts of the work include the involvement of multiple graduate students in field research, and the contribution to the broader goals of the DYNAMO campaign to improve understanding of tropical convection, the predictability of the MJO, and downstream effects of the MJO on weather in the United States and other areas.

Madden-Julian振荡（Dynamo）现场运动的动力是2011年下旬/2012年印度洋的国际实验的美国，这是印度洋合作季节内变异性实验（CINDY2011）。 Dynamo的总体目标是加快对MJO在印度洋启动的过程的关键，并改善MJO的模拟和预测。 现场运动将包括多个雷达，大气发声站点，一架研究飞机，多个研究船和海洋测量。 发电机的三个主要假设是：1）只有当潮湿层在MJO尺度的一个区域内变得足够深时，才能将深对流组织成MJO对流的包膜；这种湿润发生的步伐决定了前发作状态的持续时间，2）在不同阶段的特定对流群体对于MJO的启动至关重要，3）3）屏障层，风和剪切驱动的混合，浅层热线，浅层热线，浅层热层，以及混合夹带在此范围内，在印度海洋效果中，在印度海洋范围内和SST中都起着必不可少的作用，并在印度海洋上发挥着作用。 C波段多普勒雷达将部署在研究船R/V Roger Revelle上。 雷达将是参与Dynamo的几个。雷达共同监测和表征与MJO启动相关的沉淀对流。雷达数据将用于诊断加热曲线 - 深对流有助于大规模强迫的机制。雷达观察结果还将用于验证大规模和云解析模型的模型模拟。特别是，PI将调查相对于改善Themjo启动的预测的问题，包括：*理解对流的发展与湿润的对流之间的关系。这项工作的影响包括多位研究生参与现场研究，以及对发电机运动的更广泛目标的贡献，以提高对热带对流的理解，MJO的可预测性以及MJO对美国天气和其他地区的下游影响。