# Morton CRWE Formulation

### Description

Implementing the Morton CRWE formulation for estimating potential evapotranspiration or shallow lake evaporation.

### Usage

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### Arguments

`data` |
A list of data which contains the following items (climate variables) required by Morton CRWE formulation: |

`constants` |
A list named |

`ts` |
Must be either |

`solar` |
Must be either |

`est` |
Must be either |

`Tdew` |
Must be |

`alpha` |
Only needed if argument |

`...` |
Dummy for generic function, no need to define. |

### Details

The type of evapotranspiration calculated can be selected through argument `est`

, please see `Arguments`

for details.
The alternative calculation options can be selected through argument `solar`

and `Tdew`

, please see `Arguments`

for details.

### Value

The function prints a calculation summary to the screen containign the following elements:

- ET model name and ET quantity estimated (i.e. the value of argument `est`

)

- Option for calculating solar radiation (i.e. the value of argument `solar`

)

- If the actual dew point temperature data are used (i.e. the value of argument `Tdew`

)

- Time step of the output ET estimates (i.e. the value of argument `ts`

)

- Units of the output ET estimates

- Time duration of the ET estimation

- Number of ET estimates obtained in the entire time-series

- Basic statistics of the estimated ET time-series including *mean*, *max* and *min* values.

The function also generates a list containing the following components, which is saved into a `csv`

file named as *ET_MortonCRWE.csv* in the working directory:

`ET.Daily` |
Daily aggregated estimations of MortonCRWE potential evapotranspiration or shallow lake evaporation. |

`ET.Monthly` |
Monthly aggregated estimations of MortonCRWE potential evapotranspiration or shallow lake evaporation. |

`ET.Annual` |
Annually aggregated estimations of MortonCRWE potential evapotranspiration or shallow lake evaporation. |

`ET.MonthlyAve` |
Monthly averaged estimations of daily MortonCRWE potential evapotranspiration or shallow lake evaporation. |

`ET.AnnualAve` |
Annually averaged estimations of daily MortonCRWE potential evapotranspiration or shallow lake evaporation. |

`ET_formulation` |
Name of the formulation used which equals to |

`ET_type` |
Type of the estimation obtained which is either |

`message1` |
A message to inform the users about how solar radiation has been calculated by using which data. |

`message6` |
A message to inform the users about if actual dew point temperature has been used in the calculations or alternative calculations has been performed without dew point temperature data. |

### Author(s)

Danlu Guo

### References

McMahon, T., Peel, M., Lowe, L., Srikanthan, R. & McVicar, T. 2012. *Estimating actual, potential, reference crop and pan evaporation using standard meteorological data: a pragmatic synthesis*. Hydrology and Earth System Sciences Discussions, 9, 11829-11910.

Morton, F.I. 1983, *Operational estimates of lake evaporation*. Journal of Hydrology, vol. 66, no. 1-4, pp. 77-100.

### See Also

`data`

,`defaultconstants`

,`constants`

,`ET.MortonCRWE`

### Examples

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