Ed 3 Ed 4

Use IR if:IR 0<τ<611 μm T > TcIR=cloudy

Use IR if:IR 0< τ <611 μm T > TcIR=cloudyORIR τ>0 IR=cloudyVISST τ=0.05VISST τ=150VISST τ < 0

Ed 3 Ed 4

Use IR if:IR 0<τ<611 μm T > TcIR=cloudy

Use IR if:IR 0< τ <611 μm T > TcIR=cloudyORIR τ>0 IR=cloudyVISST τ=0.05VISST τ=150VISST τ < 0

Items of Note: Cloud Phase• Using the 2-channel IR where 0<τ<6 resulted in a decreased

number of no retrievals over central/southern Greenland. Most were replaced with ice.

• Using the 2-channel IR where 0<τ<6 resulted in an increased number of supercooled water clouds across central/southern Greenland.

• Using the 2-channel IR (regardless of value) where VISST is pegged does not lead to significant changes over this domain. There is almost no reduction in no-retrieval areas (both VISST and IR gave no-retrieval).

Items of Note: Optical Depth• Over snow, in this scene, 20% of VISST τ retrievals pegged at 0.05,

10% pegged at 150, and 10% were < 0.

• Using the 2-channel IR where 0<τ<6 resulted in increased τ over mostly over western/central Greenland. Note: the new τ, between 1 and 4, still seems low for this area.

• Using the 2-channel IR (regardless of value) where VISST is pegged does not lead to significant changes over this domain. Scattered occurrences of higher τ do exist.

• Need to exercise caution when using 2-channel IR for pegged VISST values, as IR values may be pegged as well. VISST τ may still provide a better result. Additionally, when the IR method is used, information on particle size is unavailable for larger τ clouds.