4.26 - Daily Vapor Pressure File (*.vap)

The daily vapor pressure file (*.vap) contains daily vapor pressure in mbars for each climate station for years vnyr1 through vnyr2, described below. The daily vapor pressure file is used for the Penman-Monteith and ASCE Standardized Penman-Monteith daily ET methods (flag1= 3 or 5 in the model control file, Section 4.4). The data must be in calendar year format. The file must contain data for all years in the simulation between nyr1 and nyr2, defined in the model control file (see Section 4.4). There must be a one-to-one correspondence between the climate stations listed in the climate station data file (*.cli) and the climate station data in the daily vapor pressure file. An example is provided in Appendix A.

Row-Data Program Variable Description
Row 1 Format (6x, i4, 11x, i4, 7x, a3)
1-1 vnyr1 Beginning year of vapor pressure data
1-2 vnyr2 Ending year of vapor pressure data
1-3 idum3 CYR for calendar year
Row 2 Format (i4, 2x, i2, 2x, a12, 31(f6.0))
2-1 yr Year
2-2 mo Month
2-3 tid Vapor pressure station ID
2-4 edpt2(1-31) Vapor pressure for days 1-31 in month mo

Repeat for the number of vapor pressure stations.

Repeat for each month in year yr.

Repeat for each year vnyr1 through vnyr2.