arcticclouds
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arcticclouds [2021/09/27 09:21] – [Model codes] modified link chylik | arcticclouds [2024/01/26 19:20] (current) – [Cold air outbreaks] adding link to COMBLE chylik | ||
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* Local and remote controls on Arctic mixed layer evolution [[https:// | * Local and remote controls on Arctic mixed layer evolution [[https:// | ||
* Investigating Arctic humidity inversions using balloon-borne measurements and large-eddy simulations [[https:// | * Investigating Arctic humidity inversions using balloon-borne measurements and large-eddy simulations [[https:// | ||
- | * Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water. Chylik et al., in preparation for ACPD, September 2021 | + | * Aerosol-cloud-turbulence interactions in well-coupled Arctic boundary layers over open water. |
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Cold air outbreaks (CAOs) in the Arctic are situations in which a low level mass of cold air initially situated over the sea ice is advected across the ice edge and continues over open water. This process is accompanied by the formation of a convective boundary layer that deepens rapidly, featuring strong surface heat fluxes as well as the formation of low-level mixed-phase clouds. The dynamics in the CAO boundary layer are often complex, as illustrated in Fig. 2. Often these clouds are organized into streets, which at some point downstream of the ice edge tend to break up into bigger individual cells. These cells, often arranged into a spoke-pattern, | Cold air outbreaks (CAOs) in the Arctic are situations in which a low level mass of cold air initially situated over the sea ice is advected across the ice edge and continues over open water. This process is accompanied by the formation of a convective boundary layer that deepens rapidly, featuring strong surface heat fluxes as well as the formation of low-level mixed-phase clouds. The dynamics in the CAO boundary layer are often complex, as illustrated in Fig. 2. Often these clouds are organized into streets, which at some point downstream of the ice edge tend to break up into bigger individual cells. These cells, often arranged into a spoke-pattern, | ||
- | In the recent ACLOUD field campaign in May 2017, which is part of the ongoing (AC)< | + | In the recent ACLOUD field campaign in May 2017, which is part of the ongoing (AC)< |
Related papers: | Related papers: | ||
* Turbulent transport in the Grey Zone: A large-eddy simulation model intercomparison study of the CONSTRAIN cold air outbreak case [[https:// | * Turbulent transport in the Grey Zone: A large-eddy simulation model intercomparison study of the CONSTRAIN cold air outbreak case [[https:// | ||
+ | |||
+ | Ongoing projects: | ||
+ | * COMBLE Model-Observation Intercomparison Project: 13 March 2020 cold-air outbreak over Fram Strait [[https:// | ||
===== Arctic clouds in complex terrain ===== | ===== Arctic clouds in complex terrain ===== | ||
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Various field campaigns have taken place near the Svalbard archipelago in the context of the ongoing (AC)< | Various field campaigns have taken place near the Svalbard archipelago in the context of the ongoing (AC)< | ||
- | More information about the (AC)< | + | More information about the (AC)< |
Related datasets and papers: | Related datasets and papers: | ||
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* LES results to accompany measurements at the POLARSTERN Research Vessel during the PASCAL field campaign on 7 June 2017 [[https:// | * LES results to accompany measurements at the POLARSTERN Research Vessel during the PASCAL field campaign on 7 June 2017 [[https:// | ||
* Glimpsing the ins and outs of the Arctic atmospheric cauldron [[https:// | * Glimpsing the ins and outs of the Arctic atmospheric cauldron [[https:// | ||
+ | * Case study of a humidity layer above Arctic stratocumulus using balloon-borne turbulence and radiation measurements and large eddy simulations [[https:// | ||
+ | * The COMBLE campaign: a study of marine boundary-layer clouds in Arctic cold-air outbreaks [[https:// | ||
===== Large Eddy Simulations ===== | ===== Large Eddy Simulations ===== | ||
==== Model codes ==== | ==== Model codes ==== | ||
- | At InScAPE the fine-scale simulations of Arctic clouds are performed with two models. The Dutch Atmospheric Large Eddy Simulation model (DALES) | + | At InScAPE the fine-scale simulations of Arctic clouds are performed with two models. The Dutch Atmospheric Large Eddy Simulation model ([[https:// |
(( Heus, T., Heerwaarden, | (( Heus, T., Heerwaarden, | ||
- | Simulation (DALES) and overview of its applications.// | + | Simulation (DALES) and overview of its applications.// |
- | The DALES and ICON models are described in more detail [[models|on a separate page]]. | + | The DALES and ICON models are described in more detail |
==== Mixed-Phase Microphysics in LES ==== | ==== Mixed-Phase Microphysics in LES ==== | ||
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* CCN and INP concentration can differ with altitude, not just a constant | * CCN and INP concentration can differ with altitude, not just a constant | ||
* latent heat of freezing included in the heat budget | * latent heat of freezing included in the heat budget | ||
- | * initial conditions and large-scale forcings derived from large-scale models following the method used in parameterization testbeds (( Neggers, R. A. J., A. P. Siebesma and T. Heus, 2012: Continuous single-column model evaluation at a permanent meteorological supersite. Bull. Amer. Meteor. Soc., 93, p1389-1400, DOI: | + | * initial conditions and large-scale forcings derived from large-scale models following the method used in [[testbed|parameterization testbeds]] (( Neggers, R. A. J., A. P. Siebesma and T. Heus, 2012: Continuous single-column model evaluation at a permanent meteorological supersite. Bull. Amer. Meteor. Soc., 93, p1389-1400, DOI: |
The performance of this implementation has been tested on chosen semi-idealised cold-air outbreak cases. This includes the including M-PACE (( Solomon, A., Morrison, H., Persson, O., Shupe, M. D., and J. W. Bao (2009). // | The performance of this implementation has been tested on chosen semi-idealised cold-air outbreak cases. This includes the including M-PACE (( Solomon, A., Morrison, H., Persson, O., Shupe, M. D., and J. W. Bao (2009). // |
arcticclouds.1632727270.txt.gz · Last modified: 2021/09/27 09:21 by chylik