@BeginModule
@Name      = EcaTn90p
@Title     = Warm nights percent wrt 90th percentile of reference period
@Section   = Climate indices
@Class     = Climate index
@Arguments = ifile1 ifile2 ofile
@Operators = eca_tn90p

@BeginDescription
Let @file{ifile1} be a time series of the daily minimum temperature TN, and
@file{ifile2} be the 90th percentile TNn90 of daily minimum temperatures
for any period used as reference. Then the percentage of time where TN > TNn90 
is calculated.
TNn90 is calculated as the 90th percentile of daily minimum temperatures of a five 
day window centred on each calendar day of a given climate reference period.
Note that both TN and TNn90 have to be given in the same units.
The date information of a timestep in @file{ofile} is the date of
the last contributing timestep in @file{ifile1}.
@EndDescription
@EndModule


@BeginOperator_eca_tn90p
@Title     = Warm nights percent wrt 90th percentile of reference period
@EndOperator


@BeginExample
To compute the percentage of timesteps with a daily minimum temperature
greater than the 90th percentile of the daily minimum temperatures for
a given reference period use:
@BeginVerbatim
   cdo eca_tn90p tnfile tnn90file ofile
@EndVerbatim
@EndExample
