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3-D tomographic observations of Rossby wave breaking over the North Atlantic during the WISE aircraft campaign in 2017

Krasauskas, Lukas and Ungermann, Jörn and Preusse, Peter and Friedl-Vallon, Felix and Zahn, Andeas and Ziereis, Helmut and Rolf, Christian and Plöger, Felix and Konopka, Paul and Vogel, Bärbel and Riese, Martin (2021) 3-D tomographic observations of Rossby wave breaking over the North Atlantic during the WISE aircraft campaign in 2017. Atmospheric Chemistry and Physics (ACP), 21 (13), pp. 10249-10272. Copernicus Publications. doi: 10.5194/acp-21-10249-2021. ISSN 1680-7316.

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Official URL: https://acp.copernicus.org/articles/21/10249/2021/


This paper presents measurements of ozone, wa-ter vapour and nitric acid (HNO3) in the upper tropo-sphere/lower stratosphere (UTLS) over North Atlantic andEurope. The measurements were acquired with the Gim-balled Limb Observer for Radiance Imaging of the At-mosphere (GLORIA) during the Wave Driven IsentropicExchange (WISE) campaign in October 2017. GLORIAis an airborne limb imager capable of acquiring both 2-D data sets (curtains along the flight path) and, whenthe carrier aircraft is flying around the observed air mass,spatially highly resolved 3-D tomographic data. Here, wepresent a case study of a Rossby wave (RW) breakingevent observed during two subsequent flights 2 d apart. RWbreaking is known to steepen tracer gradients and facili-tate stratosphere–troposphere exchange (STE). Our measure-ments reveal complex spatial structures in stratospheric trac-ers (ozone and nitric acid) with multiple vertically stacked fil-aments. Backward-trajectory analysis is used to demonstratethat these features are related to several previous Rossbywave breaking events and that the small-scale structure ofthe UTLS in the Rossby wave breaking region, which is oth-erwise very hard to observe, can be understood as stirringand mixing of air masses of tropospheric and stratosphericorigin. It is also shown that a strong nitric acid enhancementobserved just above the tropopause is likely a result of NOxproduction by lightning activity. The measurements showedsignatures of enhanced mixing between stratospheric and tro-pospheric air near the polar jet with some transport of watervapour into the stratosphere. Some of the air masses seen in3-D data were encountered again 2 d later, stretched to verythin filament (horizontal thickness down to 30 km at some al-titudes) rich in stratospheric tracers. This repeated measure-ment allowed us to directly observe and analyse the progressof mixing processes in a thin filament over 2 d. Our resultsprovide direct insight into small-scale dynamics of the UTLSin the Rossby wave breaking region, which is of great impor-tance to understanding STE and poleward transport in the UTLS.

Item URL in elib:https://elib.dlr.de/146023/
Document Type:Article
Title:3-D tomographic observations of Rossby wave breaking over the North Atlantic during the WISE aircraft campaign in 2017
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Krasauskas, LukasForschungszentrum JülichUNSPECIFIEDUNSPECIFIED
Ungermann, JörnForschungszentrum JülichUNSPECIFIEDUNSPECIFIED
Preusse, PeterForschungszentrum JülichUNSPECIFIEDUNSPECIFIED
Ziereis, HelmutDLR, IPAhttps://orcid.org/0000-0001-5483-5669UNSPECIFIED
Rolf, ChristianForschungszentrum JülichUNSPECIFIEDUNSPECIFIED
Plöger, FelixForschungszentrum Jülich, IEK-7 Stratosphäre, Jülich, GermanyUNSPECIFIEDUNSPECIFIED
Konopka, PaulForschungszentrum Jülich, GermanyUNSPECIFIEDUNSPECIFIED
Vogel, BärbelForschungszentrum JülichUNSPECIFIEDUNSPECIFIED
Riese, MartinForschungszentrum JülichUNSPECIFIEDUNSPECIFIED
Date:7 July 2021
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 10249-10272
Publisher:Copernicus Publications
Keywords:HALO, Rossby waves, WISE campaign
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Ziereis, Helmut
Deposited On:23 Nov 2021 09:24
Last Modified:05 Dec 2023 10:25

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