Three cloud types defined by the ISCCP C product are used: deep cloud
combined with CsCc (cloud type 1), cirrus (cloud type 2), and stratus
(cloud type 3)
.
CsCc linearly depends on deep cloud, so we combine them to
be one cloud type. Cloud type 1 linearly depends on large-scale
precipitation with the coefficient:
In the current version, cirrus and stratus are observed seasonal climatology from the ISCCP C2 data. For more details, see Section 2.2 in Zeng et al. [2].