The Role of Radiation in Tropical Cyclone Genesis and Early Intensification

辐射在热带气旋形成和早期强化中的作用

• 批准号: 1445875
• 负责人: Melville Nicholls
• 金额: $ 59.47万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-03-15 至 2019-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1445875&HistoricalAwards=false
• 关键词: Role; Radiation; Tropical; Cyclone; Genesis

AbstractThis proposal seeks to transform our knowledge of the role of radiation in tropical cyclogenesis. Evidence suggests that radiation could play a crucial role in the early stages of genesis, particularly with the nighttime cooling and enhanced convection in the early morning hours. However, the complicated pathway to genesis under the influence of radiation and induced circulations is not well understood. Two genesis pathways have been identified in past work by the investigators in this study, and the role of radiation in these pathways will be examined in this research.Intellectual MeritThis study will add to our understanding of tropical cyclogenesis by elucidating the role of radiation in the core of tropical cyclones and in the surrounding environment. The investigation will also explore other phenomena like the diurnal cycle of deep convection that appear to be connected to radiative forcing. While the vorticity field appears to be full of both positive and negative components near cold pool edges, overall vorticity increases with time. These are cutting-edge questions to explore now that we have the computational horsepower to simulate radiation and microphysics on cloud-resolving grids. Previous generations of models showed a diurnal cycle of convection (thunderstorms) but weren't able to simulate growth of the cirrus cloud canopy and the expanding cold rings aloft--features that are evident in nature. Progress under this proposal would build on previous work and improve our knowledge in this area of tropical meteorology. Broader ImpactsThis study will improve our understanding of the role of radiation in tropical cyclogenesis and could eventually lead to improved forecasting of these destructive storms. This research should help us understand how tropical cyclogenesis in future climates may differ from the present. Results will be disseminated to the community through conferences, workshops and published in peer-reviewed journals. A web site will be established to more broadly disseminate research results and provide open communications with the community.

摘要本文旨在改变我们对辐射在热带气旋形成中的作用的认识。有证据表明，辐射在形成的早期阶段可能起着至关重要的作用，特别是在夜间冷却和清晨对流增强的情况下。然而，在辐射和诱导环流的影响下，其复杂的形成途径尚不清楚。研究人员在过去的工作中已经确定了两种发生途径，辐射在这些途径中的作用将在本研究中进行研究。这项研究将通过阐明辐射在热带气旋核心和周围环境中的作用，增加我们对热带气旋形成的认识。调查还将探索其他现象，如深对流的日循环，这似乎与辐射强迫有关。虽然在冷池边缘涡度场似乎充满了正分量和负分量，但总体涡度随时间而增加。这些都是有待探索的前沿问题，因为我们现在有足够的计算能力在云分辨网格上模拟辐射和微物理。前几代的模型显示对流（雷暴）的日循环，但无法模拟卷云冠的增长和高空冷环的扩张——这些特征在自然界是显而易见的。这项建议的进展将建立在以前工作的基础上，并提高我们在热带气象学这一领域的知识。更广泛的影响这项研究将提高我们对辐射在热带气旋形成中的作用的理解，并可能最终提高对这些破坏性风暴的预测。这项研究将有助于我们了解未来气候下的热带气旋形成与现在有何不同。结果将通过会议、讲习班向社区传播，并在同行评议的期刊上发表。将建立一个网站，以便更广泛地传播研究成果，并与社会公开交流。