Mean monthly outgoing surface longwave radiation modelled using the 1" DEM-S - 1" tiled data

Mean monthly solar radiation was modelled across Australia using topography from the 1 arcsecond resolution SRTM-derived DEM-S and climatic and land surface data. The SRAD model (Wilson and Gallant, 2000) was used to derive:
• Incoming short-wave radiation on a sloping surface
• Short-wave radiation ratio (shortwave on sloping surface / shortwave on horizontal surface)
• Incoming long-wave radiation
• Outgoing long-wave radiation
• Net long-wave radiation
• Net radiation
• Sky view factor
All radiation values are in MJ/m2/day except for short-wave radiation ratio which has no units. The sky view factor is the fraction of the sky visible from a grid cell relative to a horizontal plane.

The radiation values are determined for the middle day of each month (14th or 15th) using long-term average atmospheric conditions (such as cloudiness and atmospheric transmittance) and surface conditions (albedo and vegetation cover). They include the effect of terrain slope, aspect and shadowing (for sun positions at 5 minute intervals from sunrise to sunset), direct and diffuse radiation and sky view.

The data in this collection are available at 1 arcsecond resolution as 1x1 degree tiles. 813 tiles make up the extent of Australia.

The 1 arcsecond mosaic data can be found here: https://data.csiro.au/dap/landingpage?pid=csiro:9634 .

The 3 arcsecond resolution versions of these radiation surfaces have been produced from the 1 arcsecond resolution surfaces, by aggregating the cells in a 3x3 window and taking the mean value.

The 3 arcsecond mosaic data can be found here: https://data.csiro.au/dap/landingpage?pid=csiro:18336

本数据集基于1弧秒分辨率的航天飞机雷达地形测绘任务（Shuttle Radar Topography Mission, SRTM）衍生DEM-S地形数据，以及气候与地表数据，对澳大利亚全境的月均太阳辐射开展建模。本研究采用SRAD模型（Wilson与Gallant, 2000）推导得到以下参数：
• 倾斜地表入射短波辐射
• 短波辐射比值（倾斜地表短波辐射/水平地表短波辐射）
• 入射长波辐射
• 出射长波辐射
• 净长波辐射
• 净辐射
• 天空视域因子（Sky view factor）

除短波辐射比值无单位外，所有辐射值的单位均为兆焦每平方米每天（MJ/m²/day）。天空视域因子指某栅格单元相对于水平面所能观测到的天空占比。

辐射值以每月中旬（14日或15日）为代表日，基于长期平均大气条件（如云量、大气透射率）与地表条件（如反照率、植被覆盖度）计算得到，涵盖地形坡度、坡向与阴影效应（以日出至日落期间每5分钟间隔的太阳位置进行计算），同时包含直接辐射、散射辐射与天空视域的影响。

本数据集提供1弧秒分辨率版本，数据以1×1度瓦片（tile）形式存储，共计813个瓦片覆盖澳大利亚全境。

1弧秒分辨率镶嵌数据可通过英联邦科学与工业研究组织（Commonwealth Scientific and Industrial Research Organisation, CSIRO）的数据平台获取：https://data.csiro.au/dap/landingpage?pid=csiro:9634。

上述辐射面的3弧秒分辨率版本由1弧秒分辨率数据生成，具体方式为对3×3窗口内的栅格像元进行聚合并取平均值。

3弧秒分辨率镶嵌数据可通过英联邦科学与工业研究组织（CSIRO）的数据平台获取：https://data.csiro.au/dap/landingpage?pid=csiro:18336。