Recent changes in the semiannual oscillation in the sub-Antarctic and their connections with cyclone variability

The basic data used in this project is the (US) National Centers for Environmental Prediction global reanalysis data set, and we have used the area south of 30S. Two primary data sets have come from the project. The first is the amplitude and phase of the surface semiannual oscillation over the Southern Hemisphere. The second is comprehensive statistics on cyclone behaviour over the hemisphere over this period. The project is exploring the links between the variability of these parameters. These links have been quantified by producing data sets of correlations and time series analyses.In this project, the NCEP reanalysis datasets were sourced from: NOAA/National Weather Service, National Centers for Environmental Prediction (5200 Auth Road, Camp Springs, Maryland, 20746 USA).Two NCEP reanalysis data sets were used in this study. The first was NCEP/NCAR, with 6-hourly data available from 1958 (see the URL provided below for further information). The second was the NCEP/DOE set, with 6-hourly data available from 1979 (see the URL provided below for further information).In this project the following model/analysis was applied:Application of The University of Melbourne cyclone tracking scheme (Simmonds et al., 2003, Monthly Weather Review, 131, 272-288) and a broad range of statistical tests. Brief details are provided in the Summary. See the link for the pdf document for more detailed information.These complex statistical analyses were run over the entire length of the project (1999/2000 - 2000/01). They were run on the Sun Workstation cluster in the School of Earth Sciences, The University of Melbourne.

本项目所采用的基础数据为（美国）国家环境预报中心（National Centers for Environmental Prediction, NCEP）全球再分析数据集，研究范围限定为南纬30°以南的区域。本项目衍生得到两类核心数据集：其一为南半球地表半年度振荡的振幅与相位；其二为该时段内南半球气旋活动的综合统计结果。本项目旨在探究上述参数的变异性之间的内在关联，并通过构建相关性数据集与开展时间序列分析对这些关联进行量化。

本项目使用的NCEP再分析数据集来源为：美国国家海洋和大气管理局（NOAA）/国家气象局、国家环境预报中心（地址：美国马里兰州坎普斯普林斯市奥特路5200号，邮编20746）。

本研究共使用两套NCEP再分析数据集：第一套为NCEP/NCAR再分析数据集，其6小时分辨率数据起始于1958年（详细信息可参见下文提供的链接）；第二套为NCEP/DOE再分析数据集，其6小时分辨率数据起始于1979年（详细信息可参见下文提供的链接）。

本项目采用如下模型与分析手段：墨尔本大学气旋追踪方案（Simmonds等，2003，《Monthly Weather Review》，131卷：272-288），以及一系列广泛的统计检验方法。简要细节已在研究摘要中给出，详细信息可参见下文链接中的PDF文档。

上述复杂统计分析的运行时段覆盖整个项目周期（1999/2000至2000/01），计算任务依托墨尔本大学地球科学学院的Sun工作站集群完成。