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Xiaoli Zhou
Public Documents
1
Exploring causal relationships and adjustment timescales of cloud-aerosol interaction...
Xiaoli Zhou
and 3 more
August 25, 2024
We present for the first time within the cloud physics context, the application of wavelet phase coherence analysis to disentangle counteracting physical processes associated with the lead-lag phase difference between liquid water path (LWP) and cloud droplet number concentration (Nd) in an Eulerian framework using satellite-based observations and climate model outputs. This approach allows us to identify the causality and typical adjustment timescales governing the correlation between LWP and Nd. Satellite observations indicate a more prevalent positive correlation between daytime LWP and Nd regardless of whether LWP leads or lags Nd. The positive cloud water response, associated with precipitation processes, typically occurs within 1 hour, while the negative response resulting from entrainment drying, usually takes 2-4 hours. CAM6 displays excessively rapid negative responses along with overly strong negative cloud water response and insufficient positive response, leading to a more negative correlation between LWP and Nd compared to observations.