|Access mode||Physical access|
|Infrastructure name and acronym||Leipziger Aerosolkammer (LEAK) / Leipziger Aerosol and Cloud Interaction Simulator (LACIS)|
|Location||51.35°N, 12.43°E, 120 m a.s.l.
Permoserstr. 15, D-04318 Leipzig, Germany
|Legal name of organisation operating the infrastructure||Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)|
|Description of the infrastructure|
|Brief general description of the infrastructure to which access is offered||
The simulation chamber LEAK has a cylindrical geometry, a volume of 19 m3 and is made of Teflon FEP film. LEAK is equipped with a humidifier, ozone and particle generators. Fifty-six UV lamps (100W Eversun Super, Phillips) are used to illuminate the aerosol chamber. LEAK experiments are performed at humidities up to 80%, allowing the study of multiphase chemical processes with deliquescent particles.
Hence, in summary, LEAK offers:
Specifically, LACIS offers:
|Services currently offered by the infrastructure and its research environment||
LEAK-LACIS has a more then 10-year history in providing access for guest researchers from all over the world. This comprises both, the scientific and logistical organisation of scientific activities in general and measurement campaigns, in particular. Efficient high-quality research is ensured through the existing excellent expertise in the experimental and theoretical investigation of gas-phase processes, SOA formation processes and the processing of biomass burning exhausts as well as aerosol and cloud microphysical processes. LEAK-LACIS is operated by a team of highly motivated, capable, and experienced PhD-, PostDoc-, and senior-level scientists which makes high quality scientific work and stimulating discussion a matter of course. Last but not least, TROPOS has year-long experience in the logistics of hosting guest scientists and organizing international transport of equipment.
|Modalities of access and support offered under EUROCHAMP-2020|
|Typical duration of work||
A total of 110 access days is offered under EUROCHAMP-2020 at LEAK-LACIS including provision of peripheral instrumentation for chemical analysis, peripheral instrumentation for physical aerosol characterization and use of biomass burning facility. Most campaigns have a duration between 1 and 3 weeks. A typical work includes 2-3 days to carefully prepare the experiments, then 10 days of experiments (1 experiments/day), then 1-2 days for debriefing and base data formatting, saving, and distributing among the users.
|Community/user type served||
Users from the academic sector (expert as well as young researchers) make up the vast majority of the users.
|Scientific and technical support offered||Both scientific and technical support is offered at LEAK-LACIS.|
|Logistic and administrative support offered||Support concerning shipping, handling of instrumentation, travel and accommodation is offered at LEAK-LACIS.|
|Person in charge of access provision at the infrastructure||
LEAK: Prof. Dr. Hartmut Herrmann, Head of the Atmospheric Chemistry Department (ACD), herrmann[at]tropos.deLACIS: Dr. Dennis Niedermeier, niederm[at]tropos.de
|Extended technical description|
|Physical description||The LEAK chamber is made of Teflon FEP 500A with a cylindrical geometry
Volume: 19 m3
Height: 2.68 m
Surface-to-volume ratio : 2 m-1
temperature range: LEAK: 16-30°C; ACD-C: 10-40°C
Irradiation JNO2: 6.4x10-3 s-1
Pressure range: ambient
RH range: <5% to 80%
The LACIS is a turbulent humid-air wind-tunnel, i.e., a flow through chamber, made of stainless steel with a cubic geometry.
Length: 2.0 m
Width: 0.8 m
Depth: 0.2 m
Volume: 0.32 m3
Surface-to-volume ratio: 12.5 m-1
Flowrate: 10000 l/min
Temperature range: -40°C ... +25°C
Pressure range: measurements are performed in ambient pressure
RH range: ~1% - 100%~, supersaturation can be achieved through isobaric mixing of two saturated air-flows (up to 2% so far).
The measurement section of LACIS-T is a rectangular prism, 2.0 m long, 0.8 m wide and 0.2 m deep: the projected surface area is 0.80 m x 0.20 m = 0.16 m2
|Size dependent aerosol loss/lifetime (LEAK)|
Mothes et al to Mutzel, A., Poulain, L., Berndt, T., Iinuma, Y., Rodigast, M., Böge,O., Richters, S., Spindler, G., Sipilä, M., Jokinen, T., Kulmala,M., and Herrmann, H.: Highly Oxidized Multifunctional Organic Compounds Observed in Tropospheric Particles: A Fieldand Laboratory Study, Environ. Sci. Technol., 49, 7754-7761, https://doi.org/10.1021/acs.est.5b00885, 2015
Niedermeier, D., Voigtländer, J., Schmalfuß, S., Busch, D., Schumacher, J., Shaw, R. A., and Stratmann, F.: Characterization and first results from LACIS-T: A moist-air wind tunnel to study aerosol-cloud-turbulence interactions, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2019-343, in review, 2019.
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