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Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing

Podglajen, Aurelien and Bui, T. Paul and Dean-Day, Jonathan M. and Pfister, Leonhard and Jensen, Eric J. and Alexander, M. Joan and Hertzog, Albert and Kärcher, Bernd and Ploungonven, Riwal and Randel, William J. (2017) Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing. Journal of the Atmospheric Sciences, pp. 1-23. American Meteorological Society. DOI: 10.1175/JAS-D-17-0010.1 ISSN 0022-4928

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Official URL: https://journals.ametsoc.org/doi/10.1175/JAS-D-17-0010.1

Abstract

The contribution of turbulent mixing to heat and tracer transport in the tropical tropopause layer (TTL) is poorly constrained, partly owing to a lack of direct observations. Here, the authors use high-resolution (20 Hz) airborne measurements to study the occurrence and properties of small-scale (,100 m) wind fluctuations in the TTL (14–19 km) over the tropical Pacific. The fluctuations are highly intermittent and appear localized within shallow (100 m) patches. Furthermore, active turbulent events are more frequent at low altitude, near deep convection, and within layers of low gradient Richardson number. A case study emphasizes the link between the turbulent events and the occurrence of inertio-gravity waves having small horizontal or vertical scale.

Item URL in elib:https://elib.dlr.de/118741/
Document Type:Article
Title:Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Podglajen, AurelienCNRS-UMR, Universite Pierre et Marie Curie, Paris, FUNSPECIFIED
Bui, T. PaulNASA, Moffett Field, CA, USAUNSPECIFIED
Dean-Day, Jonathan M.NASA, Moffett Field, CA, USAUNSPECIFIED
Pfister, LeonhardNASA, Moffett Field, CA, USAUNSPECIFIED
Jensen, Eric J.NASA, Moffett Field, CA, USAUNSPECIFIED
Alexander, M. JoanCoRA Office, NorthWest Research Associates, Boulder, ColoradoUNSPECIFIED
Hertzog, AlbertUPMC University Paris 06, CNRS, Palaiseau, FranceUNSPECIFIED
Kärcher, BerndDLR, IPAhttps://orcid.org/0000-0003-0278-4980
Ploungonven, RiwalLab. de Météorologie Dynamique/IPSL, Paris-Saclay University, Palaiseau, FranceUNSPECIFIED
Randel, William J.National Center for Atmospheric Research, Boulder, CO, USAUNSPECIFIED
Date:2017
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1175/JAS-D-17-0010.1
Page Range:pp. 1-23
Publisher:American Meteorological Society
ISSN:0022-4928
Status:Published
Keywords:turbulence, Tropical Tropopause, cirrus
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Kärcher, Prof. Bernd
Deposited On:11 Nov 2019 14:39
Last Modified:11 Nov 2019 14:39

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