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BATTREX-CH: The Swiss contribution to the international BAlloonsonde Tropical TRopopause EXperiment

English title BATTREX-CH: The Swiss contribution to the international BAlloonsonde Tropical TRopopause EXperiment
Applicant Peter Thomas
Number 147127
Funding scheme Project funding (Div. I-III)
Research institution Institut für Atmosphäre und Klima ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Meteorology
Start/End 01.09.2014 - 31.08.2018
Approved amount 249'900.00
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All Disciplines (2)

Discipline
Meteorology
Climatology. Atmospherical Chemistry, Aeronomy

Keywords (6)

Backscatter Measurements; Humidity Measurements; Cirrus Modelling; Western Pacific Warm Pool; Stratospheric Water Vapor; Climate Impact

Lay Summary (German)

Lead
Trotz seines bekannten Einflusses auf Strahlungshaushalt der Erde und Atmosphärenchemie liegen nur wenig gesicherte Erkenntnisse über den stratosphärischen Wasserdampf-Trend vor. Der pazifische „warm-pool“ ist als Haut-Eintrittsgebiet von troposphärischer Luft in die Stratosphäre und somit von besonderer Bedeutung für Entwicklung und Verteilung von Feuchte in der Stratosphäre. Obwohl Satellitenbeobachtung und Modellierung deutlich ver-bessert wurden, verstehen wir die Dehydrierungs-Vorgänge nur unzureichend, denn es man-gelt den Beobachtungen an räumlicher Auflösung und den Modellen an detaillierte Kenntnis der Mikrophysik. Daher sind im EU-Projekt StratoClim für den Sommer 2015 Felduntersu-chungen mit internationaler Beteiligung auf der Pazifikinsel Palau vorgesehen, zu denen dieses Projekt beiträgt.
Lay summary

Inhalt und Ziele des Forschungsprojekts

Unsere Arbeiten zielen darauf, durch (i) Ballonsondierungen mit hochwertigen Instrumenten die räumliche und zeitliche Struktur von Atmosphärenwellen sowie die Verteilung von Wasserdampf, Ozon und Aerosol zu messen; (ii) Mikrophysik-Modellierungen entlang der Lufttrajektorien zu den Messpunkten mit überlagerten kleinskaligen Temperaturfluktuationen vorzunehmen und damit die mikrophysikalischen Wechselwirkungen zwischen Aerosol und Wolken zu untersuchen; (iii) Vorgänge systematisch einzugrenzen, welche zu der bekannten, aber unverstandenen Übersättigung in Wolken führen. Zusammengenommen zielt dies auf die Entwicklung einer neuen, für Klimamodelle geeigneten Parametrisierung der Eiswolken-Mikrophysik.

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts

Unsere Arbeit wird wichtige Informationen zur Grösse des Wasserdampfeintrages in die Stratosphäre und über die dabei zugrunde liegenden Schlüsselprozesse liefern. Damit schafft sie eine verbesserte Basis für die weitere Modellierung des Einflusses von Wasserdampf auf den Klimawandel.

Direct link to Lay Summary Last update: 08.07.2014

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Water Vapor in the Asian Summer Monsoon Anticyclone: Comparison of Balloon‐Borne Measurements and ECMWF Data
Brunamonti S., Füzér L., Jorge T., Poltera Y., Oelsner P., Meier S., Dirksen R., Naja M., Fadnavis S., Karmacharya J., Wienhold F. G., Luo B. P., Wernli H., Peter T. (2019), Water Vapor in the Asian Summer Monsoon Anticyclone: Comparison of Balloon‐Borne Measurements and ECMWF Data, in Journal of Geophysical Research: Atmospheres, 2018JD0300-2018JD0300.
Balloon-borne measurements of temperature, water vapor, ozone and aerosol backscatter on the southern slopes of the Himalayas during StratoClim 2016-2017
Brunamonti Simone, Jorge Teresa, Oelsner Peter, Hanumanthu Sreeharsha, Singh Bhupendra B., Kumar K. Ravi, Sonbawne Sunil, Meier Susanne, Singh Deepak, Wienhold Frank G., Luo Bei Ping, Böttcher Maxi, Poltera Yann, Jauhiainen Hannu, Kayastha Rijan, Dirksen Ruud, Naja Manish, Rex Markus, Fadnavis Suvarna, Peter Thomas (2018), Balloon-borne measurements of temperature, water vapor, ozone and aerosol backscatter on the southern slopes of the Himalayas during StratoClim 2016-2017, in Atmospheric Chemistry and Physics Discussions, 1-38.

Collaboration

Group / person Country
Types of collaboration
Research Center Jülich, Drs. Bärbel Vogel and Rolf Müller Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
DWD, Lindenberg, Drs. Ruud Dirksen + Holger Vömel Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Alfred-Wegener-Institut, Prof. Markus Rex Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Knowledge transfer events



Self-organised

Title Date Place
Stakeholder Information on Geophysica Measurements in the Asian Monsoon 11.08.2017 Kathmandu, Nepal
Class Teaching on Radio Sounding at Kathmandu University 28.07.2017 Dhulikhel, Kathmandu University, Nepal

Communication with the public

Communication Title Media Place Year
Media relations: print media, online media Die Reise ins Unbekannte. Monsun-Forschung der ETH Zürich im unberechenbaren Nepal. Tagesanzeiger (Martin Läubli, 1-seitiges Interview mit Thomas Peter) German-speaking Switzerland 2017
Media relations: print media, online media Flug ins Unbekannte ETH Zürich, News-Page D-USYS German-speaking Switzerland 2017
Media relations: print media, online media Into the Unknown ETH Zürich, News-Page D-USYS International 2017
Talks/events/exhibitions Stakeholder Information on Geophysica Measurements in the Asian Monsoon International 2017

Awards

Title Year
ACP Award for Atmospheric Research, Atmospheric Chemistry and Physics Commission (ACP), Swiss Academy of Sciences (SCNAT), *Nomination* of Dr. Simone Brunamonti 2018

Associated projects

Number Title Start Funding scheme
103651 Physical states of mixed organic / inorganic aerosols 01.11.2004 Project funding (Div. I-III)
117987 Particle Backscatter and Relative Humidity in and around Cirrus Clouds Measured with a Lightweight Balloon Sonde 01.12.2007 Project funding (Div. I-III)
159950 Investigation of midlatitude high clouds characteristics and processes 01.01.2016 Project funding (Div. I-III)

Abstract

Water vapor trends in the stratosphere are not well understood despite their recognized importance in the Earth’s radiation budget and air chemistry. To understand the evolution and distribution of stratospheric humidity the Pacific warm pool deserves special attention, as it is a key region for air entry into the stratosphere. Notwithstanding growing knowledge from satellite observations and increasing global model capabilities, our understanding of the dehydration processes remains limited due to lack of spatial resolution of the observations, incomplete knowledge of microphysical processes and their sometimes inadequate representation in models. This calls for detailed field studies in the Pacific warm pool region as laid out in the BATTREX (BAlloonsonde Tropical TRopopause EXperiment) proposal submitted to the US NSF in June 2012 (see appendix), suggesting two extensive balloon field campaigns to be performed by an international consortium from the US, Chile, Japan, the UK, and Switzerland. The campaigns will be located at Manus Island (Papua New Guinea) in the maritime continent, taking place in Jan/Feb and June/July 2014. This study aims to - characterize the temporal, horizontal and vertical structure of atmospheric waves from balloonsonde temperature, wind and tracer data, - measure distributions of water vapor, ozone and aerosols and clouds by means of highest quality, light-weight sonde instrumentation,- determine the impact seasonal and intra-seasonal TTL variability with respect to temperature and water vapor from intense observation phases in two seasons,- characterize the aerosol-cloud-meteorology interactions from microphysical modeling applied to cooling air masses including small-scale temperature fluctuations, (dT/dt)ss ,- systematically constrain processes responsible for supersaturations in and around cirrus, - provide a basis for suitable parameterizations for (dT/dt)ss and microphysics for implementation in global climate models. This is work in a notoriously difficult (with respect to temperature and humidity) and hardly accessible environment. We have previously developed a Compact Optical Backscatter AerosoL Detector (COBALD), which is a lightweight sonde for accurate measurements of aerosol and cloud backscatter. COBALD has become an essential complement to high quality measurements of atmospheric water vapor, used in a number of international collaborations. Within the US component of BATTREX funding is included for 42 COBALD sondes to be built and supplied by ETH. We intend to strengthen this collaboration by participating in the field campaign, joint science meetings, launch preparation, sharing of the wealth of expected radio-sonde data, and contributing a strong modeling component. Our group has a high expertise regarding the analysis and modeling of the sonde data. We will contribute microphysical box and column modeling of cloud processes along air particle trajectories using the Zurich Optical and Microphysical Model (ZOMM) and the Physical Ascent Model for Sounding balloons (PAMS), constraining waves and vertical wind fluctuations by means of the sonde GPS data.
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