Ulrich Krieger: Catalogue data in Spring Semester 2021

Name Dr. Ulrich Krieger
Name variantsUlrich K Krieger
Ulrich Krieger
Institut für Atmosphäre und Klima
ETH Zürich, CHN O 18
Universitätstrasse 16
8092 Zürich
Telephone+41 44 633 40 07
DepartmentEnvironmental Systems Science

701-0234-00LAtmospheric Chemistry: Instruments and Measuring Techniques Information 1 credit1VU. Krieger
AbstractMeasuring Techniques: Environmental Monitoring, Trace Gas Detection, Remote Sensing, Aerosol Characterization, Techniques used in the laboratory.
ObjectiveFind out about the specific problems connected to composition measurements in the atmosphere. Working out criteria for selecting an optimal measuring strategy. Acquiring knowledge about different measuring methods their spectroscopic principles and of some specific instruments.
ContentEs werden Methoden und Geräte vorgestellt und theoretisch analysiert, die in atmosphärenchemischen Messungen Verwendung finden: Geräte zur Überwachung im Rahmen der Luftreinhalteverordnung, Spurengasanlysemethoden, "remote sensing", Aerosolmessgeräte, Messverfahren bei Labormessungen zu atmosphärischen Fragestellungen.
LiteratureB. J. Finnlayson-Pitts, J. N. Pitts, "Chemistry of the Upper and Lower Atmosphere", Academic Press, San Diego, 2000
Prerequisites / NoticeMethodenvorlesung zu den Praktika 701-0460-00 und 701-1230-00. Die Kontaktzeiten in diesen Praktika sind so abgestimmt, dass der (empfohlene) Besuch der Vorlesung möglich ist.

Voraussetzungen: Atmosphärenphysik I und II
701-0460-00LPractical Training in Atmosphere and Climate Information Restricted registration - show details
Number of participants limited to 35.
7 credits14PU. Krieger, M. Böttcher, R. Modini, T. Peter, A. Prévôt
AbstractThe field course offers the opportunity to carry out atmospheric physical and chemical experiments. Students can acquire knowledge in experimental, instrumental, numerical or theoretical aspects of atmospheric sciences.
ObjectiveThe learning target is the successful execution of interdisciplinary field work within the atmospheric sciences. To this end the participants will become acquainted with modern sounding and analysis methods, will collect data and will evaluate these with respect to the state of the atmosphere and the relevant processes of interest. Interdisciplinary team work will be practiced across various scientific fields (physics, chemistry, atmospheric dynamics and transport).
Prerequisites / NoticeAls Voraussetzung für dieses Praktikum werden Kenntnisse der folgenden Kurse benötigt:
- 701-0471-00 Atmosphärenchemie
- 701-0473-00 Wettersysteme
- 251-0840-01 Anwendungsnahes Programmieren mit Matlab/Python
Teilnehmer, die diese Kurse nicht belegt haben, müssen sich die erforderlichen Kenntnisse im Eigenstudium aneignen.

Als Begleitung zu diesem Praktikum wird der Besuch der folgenden Kurse sehr empfohlen:
- 701-0234-00 Messmethoden in der Atmosphärenchemie
- 701-1236-00 Messmethoden in der Meteorologie
701-1238-00LAdvanced Field and Lab Studies in Atmospheric Chemistry and Climate Restricted registration - show details
Number of participants limited to 4.
Enrollment for target group until 22.02.2021.
Waiting list until 05.03.2021.

Target groups are: MSc in Atmosphere and Climate Science ans MSc in Environmental Sciences.
3 credits2PU. Krieger
AbstractEach year an individual assignment of a specific topic (related to field work) will be made for interested students who will acquire knowledge in experimental, instrumental, or numerical aspects of atmospheric chemistry. Partly self-organized project requiring independent work in a small group.
ObjectiveThe learning target is to acquire knowledge in experimental, instrumental, numerical or theoretical aspects of atmospheric chemistry through practical work on a specific topic.

The course will be held in connection with the course 701-0460-00 P, "Practical training in atmosphere and climate". There, we offer the opportunity to carry out atmospheric physical and chemical experiments. Here, an individual assignment of a specific topic will be made for a small group of interested students.

The course is particularly addressed to students who have not attended the practical course 701-0460-00 P during their Bachelor studies, but want to gain knowledge in field work connected to atmospheric chemistry. The specific topic to work on will be chosen based on individual interests and resources available.
Prerequisites / NoticeIt is mandatory for interested students to contact the instructor before the term starts, so that individual assignments can be made/planned for.

The maximum number of participants for this course will be limited depending on resources available.
701-1262-00LAtmospheric Chemistry Lab Work Restricted registration - show details
Number of participants limited to 9.
Enrollment for target group until 19.02.2021.
Waiting list until 05.03.2021.

Target groups are: MSc in Atmosphere and Climate Science ans MSc in Environmental Sciences.
2.5 credits5PC. Marcolli, U. Krieger, T. Peter
AbstractExperiments are carried out to investigate the freezing of water droplets and ice cloud formation. Water-in-oil emulsions are prepared and cooled in a DSC (differential scanning calorimeter). The measured freezing temperatures are put in context with cloud formation in the atmosphere.
ObjectiveThis practical course offers the opportunity to get to know lab work on a topic of atmospheric importance.
ContentCirrus clouds play an important role in the radiative budget of the Earth. Due to scattering and absorption of the solar as well as terrestrial radiation the cirrus cloud cover may influence significantly the Earth climate. How the cirrus clouds exactly form, is still unknown. Ice particles in cirrus clouds may form by homogeneous ice nucleation from liquid aerosols or via heterogeneous ice nucleation on solid ice nuclei (IN). The dihydrate of oxalic acid (OAD) acts as a heterogeneous ice nucleus, with an increase in freezing temperature between 2 and 5K depending on solution composition. In several field campaigns, oxalic acid enriched particles have been detected in the upper troposphere with single particle aerosol mass spectrometry. Simulations with a microphysical box model indicate that the presence of OAD may reduce the ice particle number density in cirrus clouds by up to ~50% when compared to exclusively homogeneous cirrus formation without OAD.
The goal of this atmospheric chemistry lab work is to expand the knowledge about the influence of oxalic acid in different aqueous solution systems for the heterogeneous ice nucleation process. Experiments of emulsified aqueous solutions containing oxalic acid will be performed with a differential scanning calorimeter (DSC, TA Instruments Q10). Water-in-oil emulsions contain a high number of micrometer-sized water droplets. Each droplet freezes independently which allows the measurement of homogeneous freezing for droplets without heterogeneous IN and heterogeneous freezing in the presence of an IN. OAD is formed in-situ in a first freezing cycle and will act as an IN in a second freezing cycle. This experiment will be performed in the presence of different solutes. In general, the presence of a solute leads to a decrease of the freezing temperature. However, also more specific interactions with oxalic acid are possible so that e.g. the formation of OAD is inhibited.
In the atmospheric chemistry lab work experiments, emulsified aqueous oxalic acid solutions are prepared and investigated in the DSC during several freezing cycles. The onset of freezing is evaluated. Freezing onsets in the presence and absence of OAD are compared. This is done for pure oxalic acid solutions and oxalic acid solutions containing a second solute (e.g. another dicarboxylic acid). The quality of the emulsions is checked in an optical microscope.
Lecture notesHand-outs will be distributed during the course
LiteratureOxalic acid as a heterogeneous ice nucleus in the upper troposphere and its indirect aerosol effect,
B. Zobrist C. Marcolli, T. Koop, B. P. Luo, D. M. Murphy, U. Lohmann, A. A. Zardini, U. K. Krieger, T. Corti, D. J. Cziczo, S. Fueglistaler, P. K. Hudson, D. S. Thomson, and T. Peter
Atmos. Chem. Phys., 6, 3115–3129, 2006.
Prerequisites / NoticeThis module may be attended by 8 students at most. Practical work is carried out in groups of 2, max. 3.