GEOMACS (Geological and Oceanographic Model of Australias Continental Shelf) Percentage exceedance

Geoscience Australias GEOMACS model was utilised to produce hindcast hourly time series of continental shelf (~20 to 300 m depth) bed shear stress (unit of measure: Pascal, Pa) on a 0.1 degree grid covering the period March 1997 to February 2008 (inclusive). The hindcast data represents the combined contribution to the bed shear stress by waves, tides, wind and density-driven circulation. Ecological data collected from Torres Strait suggests that bed shear stresses exceeding 0.4 Pa are important in determining the species present (Long, Bode, and Pitcher 1997). Although this data may not be representative of other regions or benthic communities, it has been utilised to calculate two parameters for determining the relationship between shear bed stress and the benthic community. One of the parameters is the total percentage of time the bed shear stress exceeds 0.4 Pa, and this is denotedT0.4 (Hughes and Harris 2008). This dataset is a contribution to the CERF Marine Biodiversity Hub and is hosted temporarily by CMAR on behalf of Geoscience Australia.

澳大利亚地质调查局（Geoscience Australia）所采用的GEOMACS模型被用于生成回溯性逐小时时间序列数据，该数据集基于覆盖1997年3月至2008年2月（含首尾）的0.1度空间网格，涵盖水深约20至300米的大陆架区域的底剪切应力（bed shear stress），单位为帕斯卡（Pascal，Pa）。该回溯数据集反映了波浪、潮汐、风力与密度环流对底剪切应力的综合贡献。从托雷斯海峡采集的生态学数据显示，当底剪切应力超过0.4 Pa时，对该区域现存底栖物种的组成具有决定性影响（Long、Bode与Pitcher，1997）。尽管该数据未必适用于其他区域或底栖生物群落，但仍被用于计算两个参数，以厘清底剪切应力与底栖生物群落之间的关联。其中一个参数为底剪切应力超过0.4 Pa的总时长占比，记为T0.4（Hughes与Harris，2008）。本数据集是CERF海洋生物多样性中心（CERF Marine Biodiversity Hub）的贡献成果，暂由CMAR代澳大利亚地质调查局（Geoscience Australia）托管。