Towards an objective historical tropical cyclone dataset for the Australian region

• 作者: ANDrew D.Burton Christopher S.Velden Clair Stark Elizabeth A.Ritchie Joseph B.Courtney Leon Majewski Timothy L.OlANDer
• 来源期刊: 热带气旋研究与评论:英文版
• 学科: 地球科学
• 关键词: Objective tropical CYCLONE REANALYSIS satellite intensity ADT
• 年，卷（期）: 2020,（1）
• 页码范围: 23-36
• 页数: 14页
• 分类号: P444

摘要

The appropriate design of infrastructure in tropical cyclone(TC)prone regions requires an understanding of the hazard risk profile underpinned by an accurate,homogenous long-term TC dataset.The existing Australian region TC archive,or’best track’(BT),suffers from inhomogeneities and an incomplete long-term record of key TC parameters.This study assesses mostly satellite-based objective techniques for 1981-2016,the period of a geostationary satellite imagery dataset corrected for navigation and calibration issues.The satellite-based estimates of Australian-region TCs suffer from a general degradation in the 1981-1988 period owing to lower quality and availability of satellite imagery.The quality of the objective techniques for both intensity and structure is compared to the reference BT 2003-2016 estimates.For intensity the Advanced Dvorak Technique algorithm corresponds well with the BT 2003-2016,when the algorithm can use passive microwave data(PMW)as an input.For the period prior to 2003 when PMW data is unavailable,the intensity algorithm has a low bias.Systematic corrections were made to the non-PMW objective estimates to produce an extended(1989-2016)homogeneous dataset of maximum wind that has sufficient accuracy to be considered for use where a larger homogeneous sample size is valued over a shorter more accurate period of record.An associated record of central pressure using the Courtney-Knaff-Zehr wind pressure relationship was created.For size estimates,three techniques were investigated:the Deviation Angle Variance and the’Knaff’techniques(IR-based),while the’Lok’technique used model information(ECMWF reanalysis dataset and TC vortex specification from ACCESS-TC).However,results lacked sufficient skill to enable extension of the reliable period of record.The availability of scatterometer data makes the BT 2003-2016 dataset the most reliable and accurate.Recommendations regarding the best data source for each parameter for different periods of the record are summarised.