Offline Daily Evapotranspiration Datasets Based on Downscaled High-resolution CMIP6 Simulations in Australia

Quantifying the impact of climate change on actual and potential evapotranspiration (AET and PET) is essential for water security, agriculture production and environmental management. AET and PET are strongly influenced by local factors such as topography, land cover and soil moisture, which limits the usability of global climate models for their projections. Here, we dynamically downscale Coupled Model Intercomparison Project Phase 6 (CMIP6) models using Conformal Cubic Atmospheric Model (CCAM) to a 10km resolution over Australia and derive AET and PET at a daily time step using the Morton method and project future changes under SSP126, 245 and 370. Three AET / PET datasets are provided by Queensland Government Climate Projection Service team, which include Areal AET, Wet Environment Areal PET and Point PET. These datasets are computed offline based on Morton’s Complementary Relationship Areal Evapotranspiration (CRAE) model.
In addition, we also provide datasets for Pan Evaporation (linear regression model), Short and Tall Crop Reference Evapotranspiration (Penman–Monteith model) and Shallow Lake Evaporation (Morton’s Complementary Relationship Wet-surface Evaporation CRWE model). They have used dynamically downscaled CMIP6 models datasets as input.

量化气候变化对实际蒸散发（actual evapotranspiration, AET）与潜在蒸散发（potential evapotranspiration, PET）的影响，对水安全、农业生产与环境管理至关重要。AET与PET受地形、土地覆被、土壤湿度等局地因素强烈影响，这限制了全球气候模型在其预估中的适用性。本研究采用保形立方大气模式（Conformal Cubic Atmospheric Model, CCAM）对澳大利亚区域的耦合模式比较计划第六阶段（Coupled Model Intercomparison Project Phase 6, CMIP6）模式开展10公里分辨率的动力降尺度，基于莫顿方法逐日计算AET与PET，并预估共享社会经济路径（Shared Socioeconomic Pathways, SSP）126、245与370情景下的未来变化。昆士兰州政府气候预估服务团队提供了三套AET/PET数据集，分别为面域实际蒸散发、湿地环境面域潜在蒸散发以及站点潜在蒸散发。上述数据集均基于莫顿互补关系面域蒸散发（Morton’s Complementary Relationship Areal Evapotranspiration, CRAE）模型离线计算得到。此外，本研究还提供了以下数据集：基于线性回归模型的蒸发皿蒸发量（Pan Evaporation）、基于彭曼-蒙特斯（Penman-Monteith）模型的短秆与高秆作物参考蒸散发（Short and Tall Crop Reference Evapotranspiration），以及基于莫顿互补关系湿面蒸散发（Morton’s Complementary Relationship Wet-surface Evaporation, CRWE）模型的浅湖蒸发量。上述数据集均以动力降尺度后的CMIP6模式数据集作为输入。