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Dilution of Boundary Layer Cloud Condensation Nucleus Concentrations by Free Tropospheric Entrainment During Marine Cold Air Outbreaks

Tornow, F. and Ackerman, A. S. and Fridlind, A. M. and Cairns, B. and Crosbie, E. C. and Kirschler, Simon and Moore, R. H. and Painemal, D. and Robinson, C. E. and Seethala, C. and Shook, M. A. and Voigt, Christiane and Winstead, E. L. and Ziemba, L. D. and Zuidema, P. and Sorooshian, A. (2022) Dilution of Boundary Layer Cloud Condensation Nucleus Concentrations by Free Tropospheric Entrainment During Marine Cold Air Outbreaks. Geophysical Research Letters, 49 (11), pp. 1-10. Wiley. doi: 10.1029/2022GL098444. ISSN 0094-8276.

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Official URL: https://dx.doi.org/10.1029/2022GL098444

Abstract

Recent aircraft measurements over the northwest Atlantic enable an investigation of how entrainment from the free troposphere (FT) impacts cloud condensation nucleus (CCN) concentrations 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 collisioncoalescence, 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

Item URL in elib:https://elib.dlr.de/191096/
Document Type:Article
Title:Dilution of Boundary Layer Cloud Condensation Nucleus Concentrations by Free Tropospheric Entrainment During Marine Cold Air Outbreaks
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Tornow, F.Columbia UniversityUNSPECIFIEDUNSPECIFIED
Ackerman, A. S.NASA Goddard Inst., New York, USAUNSPECIFIEDUNSPECIFIED
Fridlind, A. M.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Cairns, B.NASA Goddard Inst., New York, USAUNSPECIFIEDUNSPECIFIED
Crosbie, E. C.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Kirschler, SimonDLR, IPAUNSPECIFIEDUNSPECIFIED
Moore, R. H.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Painemal, D.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Robinson, C. E.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Seethala, C.Uni Miami, Coral Cables, FL, USAUNSPECIFIEDUNSPECIFIED
Shook, M. A.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Voigt, ChristianeDLR, IPAhttps://orcid.org/0000-0001-8925-7731UNSPECIFIED
Winstead, E. L.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Ziemba, L. D.NASA Langley, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Zuidema, P.Uni Miami, Coral Cables, FL, USAUNSPECIFIEDUNSPECIFIED
Sorooshian, A.Uni Arizona, Tucson, AZ, USAUNSPECIFIEDUNSPECIFIED
Date:2022
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:49
DOI:10.1029/2022GL098444
Page Range:pp. 1-10
Publisher:Wiley
ISSN:0094-8276
Status:Published
Keywords:boundary layer, clouds turbulence
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics
Deposited By: Voigt, Dr.rer.nat. Christiane
Deposited On:29 Nov 2022 07:53
Last Modified:29 Nov 2022 07:53

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