How to drive an hour of data at the site scale

[qiaochenglong]

I want to use one or three hours of site data to drive the model. How do I change the time settings?

[cenlinhe]

once you generate the 1-hour or 3-hour forcing data, you can change the following entry in the namelist.hrldas:
FORCING_TIMESTEP = 3600 (for hourly forcing) or 10800 (for 3hourly forcing).
you can keep using NOAH_TIMESTEP = 1800 (half-hourly model timestep) or 3600 (hourly model timestep). If you see water balance issue that leads to model crash, firt try to reduce model time step from 3600 to 1800, or from 1800 to 900.

[qiaochenglong]

Thank you very much for your response. There are two issues:
1.Should the time intervals in the forced data be changed to smaller intervals, such as 1998 01 02 00 00; 1998 01 02 01 00; 1998 01 02 02 00?
2.In the sample data, using MODIS LAI data from 2000 to 2008 at a monthly scale, one row for each month, but is each column a year? Why would the monthly scale MODIS LAI data for 9 years have 20 columns?
![Uploadi

[cenlinhe]

1. Hourly forcing should be sufficient. You can also use half-hourly like what showed in our point example run.
2. The MODIS LAI is a multi-year monthly average (i.e., climatology) in the parameter table. The 20 columns is for 20 different land types of the LAI climatology. 12 rows mean 12 months.