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Motivation. Sensitivity of Precipitation to Aerosol Concentration. (Based partly on 2 d results).

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Motivation

  • Sensitivity of Precipitation to Aerosol Concentration. (Based partly on 2 d results).

  • Theory: Precipitation occurring in a “maritime” airmass should develop sooner and precipitate on the upwind slope. Precipitation in continental aerosols should be displaced downwind (if it develops at all).

  • Cloud tops in continental runs should be cooler, as slower diffusional growth is favored over growth processes occurring through collisions.


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Set-Up

  • First set of simulations was done with liquid only microphysical processes.

  • Grid spacing was 3 km.














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Perhaps

  • We need a source of aerosols to replace those scavenged.

  • Simulation redone with constant (source of), continental aerosols.


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Figure 13

Scavenging of aerosols leads to lower clouds with warmer cloud top temperatures (but dynamics more important).





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Model Restarted

  • Simulations with maritime and continental aerosols, starting from the same initial conditions at 16 GMT


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Figure 17

Ice processes

Some enhancement of precip.




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Summary Part II:

  • Initially, deep clouds over a mountainous terrain in a maritime environment produce more rain than clouds in a continental environment.

  • Over time, the clouds in a continental environment produce more rain.


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Explanation?

  • Scavenging of large aerosols allows continental air mass to evolve towards a maritime condition.

  • Differences in cloud height support this.

  • Yet, even with constant aerosols in a continental environment, precipitation from clouds in this environment is more than in the maritime/continental simulation


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Shallow clouds (should) conform to theory?

  • Differences in precipitation from shallow clouds developed much the same way as deep clouds (but effect was proportionally more important).

  • Cloud top heights were cooler in maritime simulation than in continental simulation?

  • Including ice processes does not change the result.

  • “Real world” is more complex than prevailing theory and results from 2d simulations.


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Ongoing and Future Work

  • Coupling of SBM in WRF (NSF SGER)

  • Further investigation of aerosol effects on precipitation (PIER, Israeli Science Foundation, ANTISTORM)

  • Development of hybrid SBM bulk microphysical model (?)