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.

本研究将结合联合收割机的观测分析和三维全球气候模式（GCM）的试验，深入了解南半球环状模（SAM）的热带遥相关和年代际变率。 观测结果表明，近几十年来SAM正极性的增加表明环极涡旋强度的增加。 这项研究将检验两个假设：厄尔尼诺-南方涛动（ENSO）与南极地区的遥相关受到南半球热带外纬向风结构的调制，或者不同的热带强迫导致遥相关的年代际变化。 作为一个推论，SAM和ENSO反过来影响南极大陆上空的可降水量输送，从而影响冰的质量平衡。 通过利用观测和大气环流模式模拟，将对SAM和厄尔尼诺/南方涛动与全球遥相关和全球气候变化的联系有一个新的认识。观测研究包括对现代卫星时代动量、水分和热量输送作用的动力学研究，建模研究包括使用国家大气研究中心（NCAR）社区大气模型第4版（CAM 4）进行的GCM模拟。以及研究生和研究科学家的职业发展。 将为大学讲座编写材料，并为哥伦布公立学校的学生的讲座和实地考察提供便利。 该项目将制作一个由高中生开发的网页，并将在伯德极地研究中心（BPRC）和国家冰雪数据中心公开存档。 与BPRC的外展协调员合作将为初中和高中学生提供数据和可视化活动，供当地一所以科学为导向的公立高中和俄亥俄州州立大学的暑期项目使用。