▁about ▁, ▁the ▁Ara ka wa - Sch ub ert ▁con ve ct ive ▁scheme ▁produces ▁minimal ▁con ve ct ive ▁precip itation , ▁making ▁most ▁precip itation ▁un real ist ically ▁strat iform ▁in ▁nature . ▁ ▁Cal ibration ▁ ▁When ▁a ▁physical ▁process ▁is ▁parameter ized , ▁two ▁choices ▁have ▁to ▁be ▁made : ▁what ▁is ▁the ▁struct ural ▁form ▁( for ▁instance , ▁two ▁variables ▁can ▁be ▁related ▁linear ly ) ▁and ▁what ▁is ▁the ▁exact ▁value ▁of ▁the ▁parameters ▁( for ▁instance , ▁the ▁constant ▁of ▁proportional ity ). ▁The ▁process ▁of ▁determ ining ▁the ▁exact ▁values ▁of ▁the ▁parameters ▁in ▁a ▁parameter ization ▁is ▁called ▁cal ibration , ▁or ▁sometimes ▁less ▁precise , ▁tun ing . ▁Cal ibration ▁is ▁a ▁difficult ▁process , ▁and ▁different ▁strateg ies ▁are ▁used ▁to ▁do ▁it . ▁One ▁popular ▁method ▁is ▁to ▁run ▁a ▁model , ▁or ▁a ▁sub model , ▁and ▁compare ▁it ▁to ▁a ▁small ▁set ▁of ▁selected ▁metrics , ▁such ▁as ▁temperature . ▁The ▁parameters ▁that ▁lead ▁to ▁the ▁model ▁run ▁which ▁res emb les ▁reality ▁best ▁are ▁chosen . ▁ ▁See ▁also ▁Global ▁climate ▁model ▁Cl imate ▁ensemble ▁Param et riz ation ▁ ▁References ▁ ▁Further ▁reading ▁ ▁Category : N umer ical ▁climate ▁and ▁weather ▁models <0x0A> </s> ▁Gar age ▁Beat ▁' 6 6 ▁Volume ▁ 5 : ▁Read in ' ▁Your ▁Will ," is ▁the ▁fifth ▁install ment ▁in ▁the ▁Gar age ▁Beat ▁ 6 6 ▁series ▁of ▁gar age ▁rock ▁comp il ations ▁issued ▁by