MRI: Acquisition of a Computing Cluster for Atmospheric and Geophysical Research

MRI：获取用于大气和地球物理研究的计算集群

• 批准号: 1624068
• 负责人: Michael Murphy
• 金额: $ 10.85万
• 依托单位: Coastal Carolina University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1624068&HistoricalAwards=false
• 关键词: MRI; Acquisition; Computing; Cluster; Atmospheric

This is a Major Research Instrumentation (MRI) award which funds the acquisition of a 5-node cluster computer to support research and education activities in atmospheric and oceanic sciences. On the atmospheric side the primary application of the machine is the Extended Whole Atmosphere Community Climate Model (WACCM-X), which is used here to study the mechanisms through which sudden stratospheric warming events (SSWs) affect the ionosphere. SSWs are large-scale disturbances of the stratospheric circumpolar circulation in winter (typically over the North Pole) in which stratospheric temperature can rise by up to 50C over the course of a few days. While these disturbances occur over the pole and at altitudes of about 20km, they can affect the electron content of the ionosphere over the equator at an altitude of 300km, where they can interfere with satellites used for navigation, communication, and other purposes. The mechanisms by which this influence propagates over such great distances is not known but is believed to involve the vertical propagation of atmospheric tides. Work here tests the idea that the SSW impact can occur because westerly propagating planetary-scale waves excited by the SSW produce zonal wind anomalies which affect the vertical propagation of tides, and the alternative hypothesis that the mechanism involves changes in the heating due to ultraviolet absorption by ozone.The oceanographic work considers wave-turbulence interactions in the coastal ocean, an important issue for understanding the transport of sediments associated with erosion and pollution and for understanding water properties essential to ocean biology. The work uses a large eddy simulation (LES) model, the Spectral Multi-domain model, to simulate waves in the near-shore ocean (bottom depths up to 100m or so). A key issue in understanding the interaction of waves and turbulence is the problem of separating the motion field into wave orbital motions and turbulence, which the PIs are attacking using a proper orthogonal decomposition (POD) in which individual modes represent different length scales within the flow and have energy levels which follow the classical Kolmogorov cascade. The cluster computer is used to calculate a three-dimensional POD which provides separate sets of modes to represent the wave orbital motions, small-scale turbulence, and nonlinear interactions between the two occurring at intermediate spatial scales.The MRI award has broader impacts by providing infrastructure for research and education, including courses in oceanic, atmospheric, and computer science. In particular, the computer supports the newly formed PhD program in Coastal and Marine System Science, the first doctoral program at the university. Also, undergraduate students are strongly engaged in the assembly and maintenance of the cluster computer, thus acquiring hands-on skills in working with hardware integration and operating systems.

这是一个重大研究仪器（MRI）奖，资助购买一台5节点集群计算机，以支持大气和海洋科学的研究和教育活动。 在大气方面，该机器的主要应用是扩展的全大气社区气候模式（WACCM-X），该模式用于研究平流层突然变暖事件（SSW）影响电离层的机制。 SSW是冬季平流层绕极环流的大规模扰动（通常在北极上空），其中平流层温度可以在几天内上升50摄氏度。 虽然这些扰动发生在极地和大约20公里的高度，但它们可以影响赤道上空300公里高度的电离层的电子含量，在那里它们可以干扰用于导航，通信和其他目的的卫星。 这种影响传播如此远距离的机制尚不清楚，但据信涉及大气潮汐的垂直传播。 这里的工作测试的想法，SSW的影响可能会发生，因为西向传播的行星尺度波激发SSW产生纬向风异常，影响潮汐的垂直传播，和替代假设，该机制涉及的变化，加热由于紫外线吸收臭氧。海洋学工作考虑波浪湍流相互作用在沿海海洋，这是了解与侵蚀和污染有关的沉积物迁移以及了解海洋生物所必需的水的特性的一个重要问题。 这项工作使用大涡模拟（LES）模型，频谱多域模型，模拟波浪在近岸海洋（底部深度高达100米左右）。理解波和湍流相互作用的一个关键问题是将运动场分离为波轨道运动和湍流的问题，PI使用适当的正交分解（POD）进行攻击，其中各个模式代表流内不同的长度尺度，并且具有遵循经典Kolmogorov级联的能级。 集群计算机被用来计算一个三维POD，它提供了单独的模式来代表波轨道运动，小尺度湍流，和两者之间的非线性相互作用发生在中间空间scales.The MRI奖有更广泛的影响，通过提供基础设施的研究和教育，包括海洋，大气和计算机科学的课程。 特别是，计算机支持新成立的沿海和海洋系统科学博士课程，这是该大学的第一个博士课程。 此外，本科生强烈参与集群计算机的组装和维护，从而获得与硬件集成和操作系统工作的动手技能。

项目成果

SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events

MLT 半日潮汐变化的 SuperDARN 观测以及对平流层突然变暖事件的响应

• DOI: 10.1029/2018jd030157
• 发表时间: 2019
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: Hibbins, R. E.;Espy, P. J.;Orsolini, Y. J.;Limpasuvan, V.;Barnes, R. J.
• 通讯作者: Barnes, R. J.

Nighttime mesospheric ozone enhancements during the 2002 southern hemispheric major stratospheric warming

2002年南半球主要平流层变暖期间夜间中层臭氧增强

• DOI: 10.1016/j.jastp.2017.12.018
• 发表时间: 2018
• 期刊: Journal of Atmospheric and Solar-Terrestrial Physics
• 影响因子: 1.9
• 作者: Smith-Johnsen, Christine;Orsolini, Yvan;Stordal, Frode;Limpasuvan, Varavut;Pérot, Kristell
• 通讯作者: Pérot, Kristell

Hurricane Matthew (2016) and its impact under global warming scenarios

飓风马修（2016 年）及其在全球变暖情景下的影响

• DOI: 10.1007/s40808-018-0420-6
• 发表时间: 2018
• 期刊: Modeling Earth Systems and Environment
• 影响因子: 3
• 作者: Jisan, Mansur Ali;Bao, Shaowu;Pietrafesa, Leonard J.;Shen, Dongliang;Gayes, Paul T.;Hallstrom, Jason
• 通讯作者: Hallstrom, Jason