integer, save physparam::iovrsw = 1

cloud overlapping control flag for SW
=0:use random cloud overlapping method
=1:use maximum-random cloud overlapping method
Opr GFS/CFS=1; see IOVR_SW in run scripts

Referenced by module_radiation_clouds::cld_init(), rrtmg_sw::mcica_subcol(), rrtmg_sw::rrtmg_sw_run(), and rrtmg_sw::rswinit().