Great Artesian Basin - Cadna-owie Hooray Aquifer - 13C

Data used to produce the predicted Carbon-13 map for the Cadna-owie - Hooray Aquifer in the Hydrogeological Atlas of the Great Artesian Basin (Ransley et.al., 2015).There are four layers in the Cadna-owie - Hooray Aquifer Carbon-13 map dataA. Location of hydrochemistry samples (Point data, Shapefile)B. Predicted Concentration (Filled contours , Shapefile)C. Predicted Concentration Contours (Contours, Shapefile)D. Prediction Standard Error (Filled contours , Shapefile)The predicted values provide a regional based estimate and may be associated with considerable error. It is recommended that the predicted values are read together with the predicted error map, which provides an estimate of the absolute standard error associated with the predicted values at any point within the map.The predicted standard error map provides an absolute standard error associated with the predicted values at any point within the map. Please note this is not a relative error map and the concentration of a parameter needs to be considered when interpreting the map. Predicted standard error values are low where the concentration is low and there is a high density of samples. Predicted standard errors values can be high where the concentration is high and there is moderate variability between nearby samples or where there is a paucity of data.Carbon-13 units are 13C PDB.Coordinate system is Lambert conformal conic GDA 1994, with central meridian 134 degrees longitude, standard parallels at -18 and -36 degrees latitude.The Cadna-owie - Hooray Aquifer Carbon-13 map is one of 14 hydrochemistry maps for the Cadna-owie - Hooray Aquifer and 24 hydrochemistry maps in the Hydrogeological Atlas of the Great Artesian Basin (Ransley et.al, 2014). This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 81704 References:Hitchon, B. and Brulotte, M. (1994): Culling criteria for `standard formation water analyses; Applied Geochemistry, v. 9, p. 637-645Ransley, T., Radke, B., Feitz, A., Kellett, J., Owens, R., Bell, J. and Stewart, G., 2015. Hydrogeological Atlas of the Great Artesian Basin. Geoscience Australia. Canberra. [available from www.ga.gov.au using catalogue number 79790]

用于生成《大自流盆地水文地质图集》（Ransley等人，2015）中卡德纳-奥维-欢呼含水层碳-13（Carbon-13）预测图的数据集。

卡德纳-奥维-欢呼含水层碳-13预测图数据包含四层内容：

A. 水文化学样本位置（点数据，Shapefile格式）
B. 预测浓度（填充等高线，Shapefile格式）
C. 预测浓度等高线（等高线，Shapefile格式）
D. 预测标准误差（填充等高线，Shapefile格式）

预测值为区域性估算值，可能存在显著误差。建议将预测值与预测误差图结合使用，后者可提供图中任意点预测值对应的绝对标准误差估算。

预测标准误差图提供图中任意点预测值对应的绝对标准误差。请注意，此图并非相对误差图，解读时需考虑参数浓度。在浓度较低且样本密度较高的区域，预测标准误差值较低；而在浓度较高、邻近样本间存在中等变异性或数据匮乏的区域，预测标准误差值可能较高。

碳-13的单位为13C PDB。

坐标系采用兰伯特正形圆锥投影（GDA 1994），中央经线为东经134度，标准纬线为南纬18度和南纬36度。

卡德纳-奥维-欢呼含水层碳-13预测图是该含水层14张水文化学图之一，同时也是《大自流盆地水文地质图集》（Ransley等人，2014）中24张水文化学图的一部分。

本数据集及相关元数据可通过目录编号81704从www.ga.gov.au获取。

参考文献：
Hitchon, B. 和 Brulotte, M. (1994)：标准地层水分析的筛选标准；《应用地球化学》，第9卷，第637-645页

Ransley, T., Radke, B., Feitz, A., Kellett, J., Owens, R., Bell, J. 和 Stewart, G. (2015)：《大自流盆地水文地质图集》，澳大利亚地球科学局，堪培拉[可通过目录编号79790从www.ga.gov.au获取]