Spatial and Temporal Features of the Frequency of Cloud Occurrence over China Based on CALIOP

Figure 9

Distribution of single-layer cloud occurrence at different heights (high, middle, low) over China and surrounding areas in different seasons (MAM, JJA, SON, and DJF), %. The shaded part indicates that the surface elevation is above 3.1 km (680 hpa).

(a) MAM high clouds

(b) JJA high clouds

(c) SON high clouds

(d) DJF high clouds

(e) MAM middle clouds

(f) JJA middle clouds

(g) SON middle clouds

(h) DJF middle clouds

(i) MAM low clouds

(j) JJA low clouds

(k) SON low clouds

(l) DJF low clouds