This paper presents a continental scale interpretation of δ²H and δ¹⁸O in Australian precipitation, incorporating historical GNIP data at seven sites (1962–2002) and 8–12 years of new monthly data from 15 sites from 2003 to 2014. The more than doubling of stations and the significant time series duration allow for an improved analysis of Australian precipitation isotopes. Local meteoric water lines were developed for each site, and for the Australian continent. When the annual precipitation weighted values were used, the Australian meteoric water line was δ²H = 8.3 δ¹⁸O + 14.1‰.

Precipitation amount was found to be a stronger driver of precipitation isotopes than temperature at most sites, particularly those affected by tropical cyclones and the monsoon. Latitude, elevation and distance from the coast were found to be stronger drivers of spatial variability than temperature or rainfall amount.

Annual isoscapes of δ²H, δ¹⁸O and deuterium excess were developed, providing an improved tool to estimate precipitation isotope inputs to hydrological systems. Because of the complex climate, weather and oceanic moisture sources affecting Australia, regional groupings were used instead of the climate zone approach and additional data was included to improve the coverage in data poor regions. Regression equations for the isoscape were derived using latitude, altitude and distance from the coast as predictor variables.

We demonstrate how this isoscape can be used as a tool for interpreting groundwater recharge processes using examples from across Queensland and New South Wales, including the Murray Darling Basin. Groundwater isotopes at sites where direct local recharge occurs are similar to rainfall, but for inland sites, which are often arid or semi-arid, a disconnect between shallow groundwater and local rainfall is observed; the departure in deuterium excess for these sites increases with aridity and distance from the headwaters where flooding originates.

本文介绍了一个δ大陆尺度解释² H和δ ¹⁸在澳大利亚沉淀O，在七个地点（一九六二年至2002年）和8 - 12年的15位新的月度数据从2003年到2014年更将历史数据GNIP台站数量增加一倍，而且时间序列持续时间长，因此可以改善对澳大利亚降水同位素的分析。为每个站点和澳大利亚大陆开发了当地的流水线。当使用年降水量加权值，澳大利亚大气降水线为δ ² H = 8.3δ ¹⁸ O + 14.1‰。

在大多数地点，特别是受热带气旋和季风影响的地点，发现降水量是比温度更强的降水同位素驱动因子。与温度或降雨量相比，纬度，海拔和与海岸的距离是更强的空间变异性驱动力。

δ的年度isoscapes ² H，δ ¹⁸ O和氘过量被开发，提供估计沉淀同位素输入水文系统的改进的工具。由于影响澳大利亚的复杂的气候，天气和海洋水分源，我们使用区域分组代替了气候区方法，并加入了更多数据以改善数据贫乏地区的覆盖范围。利用纬度，高度和距海岸的距离作为预测变量，导出了等值线的回归方程。

我们以昆士兰州和新南威尔士州（包括墨累达令盆地）为例，演示了如何将该等景线用作解释地下水补给过程的工具。发生直接局部补给的地点的地下水同位素与降雨相似，但是对于内陆站点（通常是干旱或半干旱），观察到浅层地下水与局部降雨之间存在断层；这些地点氘过量的偏离随着干旱的发生和距洪水泛滥源头的距离而增加。