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- Investigate distributions of microphysical, optical and radiative properties of cirrus clouds to better understand and more accurately quantify their climate impact
- Study cirrus properties, lifetime, ambient conditions (updraft, RHI, aerosol load) in meteorological regimes typical for high latitudes → focus in-situ cirrus
- Validate satellite products and ground-based observations and evaluate advanced cloud models
- Assess cirrus and contrail cirrus predictability → Contrail avoidance demo
- Directly observe contrail cirrus and investigate differences between contrail and natural cirrus
- Quantify an aviation effect on cirrus
Cirrus at high and mid latitudes
- Are cirrus clouds adequately represented in climate models? Convection? Mixed phase clouds? → What is the related uncertainty in their climate impact?
- Do weather models underestimate/overestimate water vapor and RHi in cirrus regions, in the upper troposphere and in the lower stratosphere?
- What is the role of clouds for the Arctic amplification?
- Are Arctic cirrus observations from Calipso real?
- Process studies: Convection, WCB, ridge cirrus, high pressure cirrus, leewave cirrus
- Do contrails significantly modify microphysical, optical and radiation effect on cirrus in mid-latitudes?
- Do cirrus properties in regions with high air traffic differ from cirrus in regions with low airtraffic?
- Is there an aviation impact on cirrus (in addition to contrails)?
- Do we understand the daily cycle of cirrus radiative effects (LW/SW/Net)?
- Is there a distinguishable anthropogenic effect on cirrus (compared to e.g. BLUESKY 2020, ML-CIRRUS 2014)?