Mean transpiration in October from the plant canopy for the present day scenario

\n\nMean annual (00) and monthly (01a|12) transpiration (mm) from the plant canopy\nfor the period 1980-1999.Interpretation:Canopy transpiration is far more\nspatially variable than potential evaporation, reflecting the effects of water\nlimitation in most areas of the continent. Both the annual mean and seasonal\npattern broadly resemble the corresponding patterns for rainfall. Canopy\ntranspiration maps have more acontrasta (relative variation) than the total\nevaporation or rainfall maps because transpiration is a small component of\ntotal evaporation in areas of low plant cover (the remainder being soil\nevaporation).The partitioning between soil evaporation and canopy\ntranspiration in the model is determined by leaf area index.Notes: These are\nmodel-based estimates from the BiosEquil model. Results are given for the\naBASEa (pre-1788) and aAGRICa (present day) conditions. The aAGRICa case\nincludes current agricultural inputs of water from\nirrigation.EvapCanopy.00.Agric, EvapCanopy.01.Agric a| EvapCanopy.12.Agric a\nMean annual and monthly canopy transpiration (mm) in the aAGRICa (present day)\nscenarioEvapCanopy.00.Base, EvapCanopy.01.Base a| EvapCanopy.12.Base a Mean\nannual and monthly canopy transpiration (mm) in the aBASEa (pre-1788)\nscenarioData is in geographics and GDA94.\n\nSee [further metadata](http://data.daff.gov.au/anrdl/metadata_files/pa_ctab_r9cl\n__01411a11.xml) for more detail.\n\n

本数据集涵盖1980-1999年间植物冠层的年平均（标识：00）与逐月（标识：01a|12）蒸腾量，单位为毫米。

### 解译说明
冠层蒸腾的空间变异程度远高于潜在蒸发量（potential evaporation），这反映了该大陆多数区域的水分限制效应。冠层蒸腾的年平均分布与季节变化模式，均与降雨量的对应分布模式大体相似。相较于总蒸发量或降雨量分布图，冠层蒸腾分布图具有更高的对比度（相对变异程度），这是因为在植被覆盖率较低的区域，蒸腾仅占总蒸发量的较小部分，其余部分为土壤蒸发。模型中土壤蒸发与冠层蒸腾的分配比例由叶面积指数（Leaf Area Index, LAI）决定。

### 备注说明
本数据集为基于BiosEquil模型的估算结果，涵盖"aBASEa"（1788年以前）与"aAGRICa"（当代）两种情景。其中"aAGRICa"情景包含当前农业生产的灌溉用水输入。

文件名`EvapCanopy.00.Agric`、`EvapCanopy.01.Agric`至`EvapCanopy.12.Agric`：对应"aAGRICa"（当代）情景下的年平均与逐月冠层蒸腾量，单位为毫米。
文件名`EvapCanopy.00.Base`、`EvapCanopy.01.Base`至`EvapCanopy.12.Base`：对应"aBASEa"（1788年以前）情景下的年平均与逐月冠层蒸腾量，单位为毫米。

本数据集采用地理坐标系与GDA94（澳大利亚大地坐标系1994）。

更多详细元数据请参见[进一步元数据](http://data.daff.gov.au/anrdl/metadata_files/pa_ctab_r9cl__01411a11.xml)。