Antarctic Climate Variability and Tropical Teleconnections

南极气候变化和热带遥相关

• 批准号: 0751291
• 负责人: David Bromwich
• 金额: $ 39万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751291&HistoricalAwards=false
• 关键词: Antarctic; Climate; Variability; Tropical; Teleconnections

This study will combine observational analyses and three-dimensional global climate model (GCM) experiments to gain insight to the tropical teleconnections and decadal variability of the Southern Hemisphere Annular Mode (SAM). Observations show an increasing positive polarity to the SAM in recent decades denoted by an increase in intensity of the circumpolar vortex. The study will test two hypotheses: that the teleconnection of the El Nino-Southern Oscillation (ENSO) to the Antarctic region is modulated by the zonal wind structure over the Southern Hemisphere extratropics, or alternatively, that different tropical forcing leads to decadal variability in the teleconnection. As a corollary, the SAM and ENSO in turn influence precipitable water transport over the Antarctic continent, and hence the ice mass balance. A new level of understanding of the SAM and ENSO linkages to global teleconnections and global climate change will be achieved by use of both observations and GCM simulations. The observational research includes a dynamical study of the role of momentum, moisture and heat transports during the modern satellite era, and the modeling study includes GCM simulations with the National Center for Atmospheric Research (NCAR) Community Atmosphere Model version 4 (CAM4).Broader impacts of this study include contributions to the goals of the International Polar Year, as well as career development for a graduate student and a research scientist. Material for university lectures will be developed, and lectures and field trips for students from the Columbus Public Schools will be facilitated. The project will produce a webpage developed by high school students, and will archive publicly-available results at the Byrd Polar Research Center (BPRC) and the National Snow and Ice Data Center. Collaboration with BPRC's outreach coordinator will yield data and visualization activities for middle and high school students to be used by a local science-oriented public high school and by summer programs at Ohio State University.

这项研究将结合观察性分析和三维全球气候模型（GCM）实验，以洞悉南半球环形模式（SAM）的热带遥控性和际变异性。 观测结果显示，近几十年来，SAM的正极性越来越高，这是由于极度涡流强度的增加所示。 该研究将检验两个假设：El Nino-Southern振荡（ENSO）对南极区域的链链连接受到南半球外部的Zonal风结构的调节，或者替代地，以不同的是，不同的热带强迫降低了铅的铅可变性。远程连接。 作为推论，SAM和ENSO反过来影响了南极大陆上令人jot可质的水的运输，因此会产生冰质量平衡。 对SAM和ENSO与全球远程连接和全球气候变化的联系的新水平将通过使用观测值和GCM模拟来实现。观察性研究包括对现代卫星时代的动量，水分和热运输作用的动态研究，建模研究包括与国家大气研究中心（NCAR）社区大气模型4（CAM4）的GCM模拟。这项研究的影响包括对国际极性年目标的贡献，以及研究生和研究科学家的职业发展。 将开发大学讲座的材料，并为哥伦布公立学校的学生提供讲座和实地考察。 该项目将生产由高中生开发的网页，并将在伯德极地研究中心（BPRC）和国家雪与冰数据中心在伯德极地研究中心（BYRD Polar Research Center）公开归档。 与BPRC的外展协调员的合作将为中学和高中生提供数据和可视化活动，由当地的以科学为导向的公立高中和俄亥俄州立大学的夏季课程使用。