Publication Abstracts

Tornow et al. 2022

Tornow, F., A.S. Ackerman, A.M. Fridlind, B. Cairns, E.C. Crosbie, S. Kirschler, R.H. Moore, C.E. Robinson, C. Seethala, M.A. Shook, C. Voigt, E.L. Winstead, L.D. Ziemba, P. Zuidema, and A. Sorooshian, 2022: Dilution of boundary layer cloud condensation nucleus concentrations by free tropospheric entrainment during marine cold air outbreaks. Geophys. Res. Lett., 49, no. 11, e2022GL098444, doi:10.1029/2022GL098444.

Recent aircraft measurements over the northwest Atlantic enable an investigation of how entrainment from the free troposphere (FT) impacts cloud condensation nuclei (CCN) in the marine boundary layer (MBL) during cold-air outbreaks (CAOs), motivated by the role of CCN in mediating transitions from closed to open-cell regimes. Observations compiled over eight flights indicate predominantly far lesser CCN concentrations in the FT than in the MBL. For one flight, a fetch-dependent MBL-mean CCN budget is compiled from estimates of sea-surface fluxes, entrainment of FT air, and hydrometeor collision-coalescence, based on in-situ and remote-sensing measurements. Results indicate a dominant role of FT entrainment in reducing MBL CCN concentrations, consistent with satellite-observed trends in droplet number concentration upwind of CAO cloud-regime transitions over the northwest Atlantic. Relatively scant CCN may widely be associated with FT dry intrusions, and should accelerate cloud regime transitions where underlying MBL air is CCN-rich, thereby reducing regional albedo.

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BibTeX Citation

@article{to06200a,
  author={Tornow, F. and Ackerman, A. S. and Fridlind, A. M. and Cairns, B. and Crosbie, E. C. and Kirschler, S. and Moore, R. H. and Robinson, C. E. and Seethala, C. and Shook, M. A. and Voigt, C. and Winstead, E. L. and Ziemba, L. D. and Zuidema, P. and Sorooshian, A.},
  title={Dilution of boundary layer cloud condensation nucleus concentrations by free tropospheric entrainment during marine cold air outbreaks},
  year={2022},
  journal={Geophys. Res. Lett.},
  volume={49},
  number={11},
  pages={e2022GL098444},
  doi={10.1029/2022GL098444},
}

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RIS Citation

TY  - JOUR
ID  - to06200a
AU  - Tornow, F.
AU  - Ackerman, A. S.
AU  - Fridlind, A. M.
AU  - Cairns, B.
AU  - Crosbie, E. C.
AU  - Kirschler, S.
AU  - Moore, R. H.
AU  - Robinson, C. E.
AU  - Seethala, C.
AU  - Shook, M. A.
AU  - Voigt, C.
AU  - Winstead, E. L.
AU  - Ziemba, L. D.
AU  - Zuidema, P.
AU  - Sorooshian, A.
PY  - 2022
TI  - Dilution of boundary layer cloud condensation nucleus concentrations by free tropospheric entrainment during marine cold air outbreaks
JA  - Geophys. Res. Lett.
VL  - 49
IS  - 11
SP  - e2022GL098444
DO  - 10.1029/2022GL098444
ER  -

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