Evaporative source regions for Australian precipitation from Lagrangian back-trajectory analysis v1.0

This dataset contains the evaporative sources of moisture supplying precipitation across Australia each day between 1979 and 2013. Evaporative sources were estimated using a Lagrangian back-trajectory approach based on Dirmeyer and Brubaker (1999; Journal of Geophysical Research). Evaporative sources were estimated by tracking all forms of atmospheric water backward through the atmosphere using 3d wind fields and a 10 minute time step. Precipitation falling anywhere on the Australian continent of more than 2mm/day was tracked.
The back-trajectory model was driven by three-hourly, 3d atmospheric fields of wind, temperature, precipitable water and pressure, and 2d fields of precipitation and latent heat flux, produced by a WRFv3.6.1 simulation driven by ERA-Interim reanalysis (Dee D. et al., 2011). The simulation was performed over the CORDEX Australasia region with a spatial horizontal resolution of approximately 50km and 30 vertical levels.
The dataset contains the following variables:
- water vapour contribution of domain grid cells to each cell where it rained
- precipitation at each grid cell where it rained
- x and y index of precipitation in number of cells from [0,0]
The water vapour contribution is dimensioned [gridcell_wvc,i_cross,j_cross] where gridcell_wvc is the record identifier of grid cells where precipitation occurred on that day; i_cross and j_cross are the coordinates of the curvilinear grid.
References
Dee D.P., Uppala S.M., Simmons A., Berrisford P., Poli P., Kobayashi S., Andrae U., Balmaseda M., Balsamo G., Bauer d.P., et al.
The ERA-interim reanalysis: Configuration and performance of the data assimilation system

Q J R Meteorol Soc, 137 (656) (2011), pp. 553-597, 10.1002/qj.828
Dirmeyer, P.A. and Brubaker, K.L. (1999). Contrasting evaporative moisture sources during the drought of 1988 and the flood of 1993. Journal of Geophysical Research 104: doi: 10.1029/1999JD900222. issn: 0148-0227.
ECMWF ERA-Interim data used in this study/project have been obtained from the ECMWF MARS Data Server on 2020-03-01.

本数据集涵盖1979年至2013年间每日为澳大利亚全境降水提供水汽的蒸发源项。蒸发源项基于Dirmeyer与Brubaker（1999年，发表于《地球物理学研究杂志》）提出的拉格朗日后向轨迹法进行估算：通过三维风场与10分钟时间步长，对大气中各类水汽进行反向追踪，以此完成蒸发源项的估算。本研究仅追踪澳大利亚大陆上日降水量超过2毫米的区域的降水过程。

本后向轨迹模型的驱动场来自ERA-Interim再分析资料（Dee D.等，2011）驱动的WRFv3.6.1模拟结果，包含逐3小时的三维风场、温度场、可降水量场、气压场，以及二维降水场与潜热通量场。该模拟在CORDEX澳大拉西亚区域开展，空间水平分辨率约为50千米，垂直方向共30层。

本数据集包含以下变量：
- 研究区域网格单元对每个发生降水的网格单元的水汽贡献量
- 每个发生降水的网格单元的降水量
- 以[0,0]为原点的降水网格x、y索引（单位：网格数）

水汽贡献量的维度为[gridcell_wvc,i_cross,j_cross]，其中gridcell_wvc为当日发生降水的网格单元的记录标识符；i_cross与j_cross为曲线网格的坐标值。

参考文献
Dee D.P., Uppala S.M., Simmons A., Berrisford P., Poli P., Kobayashi S., Andrae U., Balmaseda M., Balsamo G., Bauer d.P. 等. ERA-Interim再分析资料：数据同化系统的配置与性能[J]. 英国皇家气象学会季刊, 2011, 137(656): 553-597. DOI: 10.1002/qj.828
Dirmeyer P.A., Brubaker K.L. 1999. 1988年干旱与1993年洪涝期间蒸发水汽源的对比分析[J]. 地球物理学研究杂志, 104. DOI: 10.1029/1999JD900222. ISSN: 0148-0227
本研究使用的ECMWF ERA-Interim数据于2020年3月1日从ECMWF MARS数据服务器获取。