WRFV300 update: two items

(1) In WRFV300 on the Mac, using the Intel Fortran 10.1 compiler, the compiler flag –switch fe_use_rtl_copy_arg_inout causes problems that weren't apparent with earlier WRF versions. Specifically, lateral boundary tendencies for water vapor are zeroed, resulting in problems in this field that grow inward from the boundaries. In the wrfbdy_d01 file, fields like QVAPOR_BXE and related entries possess only zeroes. This file is, of course, created by real.exe.

I added this switch owing to this page. Removing it does no harm. I tried several minor versions of ifort 10.1, explored 32 and 64 bit, etc.; nothing helped fix this issue except removing this switch.

(2) In WRFV300, the Lin microphysics scheme (mp_physics = 2) has issues -- noise issues. After only a few tens of minutes, the pressure field starts displaying small scale noise. Decreasing the time step, implementing 6th order smoothing, and upping the small time step smoothing (epssm) do not help. For the simulations I am examining, the noise does not appear with any other microphysics scheme. With Lin, the noise appears in higher but not in lower resolution simulations.

The Lin code was altered between WRFV221 and WRV300. I have not isolated the code changes that cause this problem.