Six cloud water schemes were implemented into the ECPC G-RSM and
tested in global simulations. One is Zhao and Carr cloud water scheme
(ZC) currently in use by NCEP models, which predicts cloud water, but
cloudiness is diagnosed from cloud water and relative humidity. The
second is the Iacobellis and Somerville cloud scheme (IS) being used in
the ECPC Single Column Model, which predicts both cloud water and cloud
amount based on Tiedtke cloud scheme. In addition, four cloud water
schemes (CLD3, CLDW, CLD5 and CLD6), different in complexity (CLD6
being the most complex) developed by Hong (Hong et al., 2004) and now a
part of the WRF model, are also tested. These schemes predict multiple
cloud substances, ranging from cloud water, cloud ice, rain water, snow
and graupel. Cloud amount are calculated from both cloud water and
relative humidity with the same manner as ZC in these schemes. 10 year
experiment were performed using each cloud water scheme. In the
seminar, the impact of cloud water schemes on climatological fields of
not only clouds but also other variables will be presented.