TNA10: Access to HPB

WP Leader:  Christian Plaß-Dülmer


Name of the infrastructure: Hohenpeissenberg Meteorological Observatory (HPB)
Location (town, country): Hohenpeissenberg, Germany
Web site address:
Legal name of organisation operating the infrastructure: Deutscher Wetterdienst
Location of organisation (town, country): Offenbach, Germany
Annual operating costs (excl. investment costs) of the infrastructure (€): 947.930

Description of the infrastructure:
The Hohenpeissenberg Observatory (HPB) is one of two meteorological observatories run by the German Meteorological Service DWD (Deutscher Wetterdienst) within the research and development business area. It is located in Southern Germany at 47°48'N, 11°01'E, 985 m a.s.l., on a foothill of the Alps. The site rises about 300 to 400 meters above the surrounding Upper Bavarian Alpine foreland. It is situated in a rural area, land use is a mixture of forests, meadows, pastures and small villages, which is typical for central and Western Europe.

Hohenpeissenberg is well-known for routine ozone monitoring, which started in 1967 with balloon-soundings and total ozone measurements. A differential absorption LIDAR is profiling ozone and temperature between 15 and 50 km altitude since 1987. Monitoring of surface ozone started in 1971. Since 1999, HPB is Dobson Calibration Centre for WMO Regional Association VI (i.e. Europe). Ozone profiles and columns as well as radiation data (global and diffuse) are routinely submitted to the international NDSC, WMO world ozone and UV (Toronto), radiation (St. Petersburg) and NILU data centres.

Since 1994, when HPB became a Global Station in WMO's Global Atmosphere Watch programme (GAW) and an EMEP supersite, continuous measurements of the trace gases O3, NO, NO2, NOX, NOY, NH3, PAN, SO2, and CO, the climate gases CO2 and CH4, as well as non-methane hydrocarbons (NMHC, C2 to C14, up to 100 different species) and selected OVOC, some with complementary techniques have been started.

Continuous measurements of OH radicals and gaseous H2SO4 using the selective ion chemical ionisation mass-spectrometry technique have been run since 1998. A substantial set of aerosol parameters, including TSP, PM-10, black carbon (aethalometer, MAAP and PSAP), condensation nuclei concentrations (3 and 11 nm cut-off), size distributions (SMPS and optical), and optical parameters (nephelometer) is also monitored, complemented by routine analyses of the chemical composition of precipitation and aerosol (total and size resolved from 3-stage Berner impactor). The observatory also operates a precipitation-radar, a ceilometer for boundary layer height and aerosol vertical profiles, a PFR for AOD measurements, and a MAXDOAS instrument in cooperation with IUP (Heidelberg, Germany). The full set of standard meteorological parameters is recorded, as well as radiation parameters such as NO2 and O1D photolysis frequencies. More details of the state-of-the-art monitoring programme at HPB are summarised at , in the meta-data of the GAW world data centres, and the GAW Station Information System (GAWSIS, see

In the frame of GAW, an increasing amount of components is being externally audited and quality controlled. The laboratories at HPB cover a GAW lab for most gaseous and aerosol measurements, a VOC lab for NMHC, selected OVOCs and biogenic compounds, a CIMS lab for measurements of OH radical and sulphuric acid concentrations in the gas phase, an ozone lab (soundings and LIDAR) and an ion chromatography lab for analysis of aerosol and precipitation analysis. On the 3d floor there is a guest laboratory (36 m²) equipped with air conditioning, central gas supply, an air sampling manifold with ports to connect instruments, and several feed throughs in the wall to install sampling lines to ambient atmosphere. Furthermore, outdoor space (roof platform and container space) is available for measurement campaigns. In addition to its tasks as long-term monitoring station in GAW, atmospheric chemistry research is conducted covering instrument development, process studies, exchange between trace gases and particulates, and trend-analyses of atmospheric constituents.

There are three exceptional features that make HPB important and interesting for TNA:
1. One of the most comprehensive measurement programmes of gaseous and aerosol parameters combined with vertical information from MAXDOAS, PFR, Ceilometers, and ozone soundings, make the observatory a prime place for process studies in atmospheric chemistry and new particle formation in short-term and long-term studies.
2. High expertise and most thorough quality assurance and control measures guarantee highest quality in aerosol and trace gas measurements. Scientists from Hohenpeissenberg contribute in GAW Expert Groups, defining GAW standard procedures, training (GAWTEC) and support other stations in conceptual and QA issues. This makes HPB interesting for know-how transfer.
3. The guest laboratory with its ring manifold offers unique opportunities to conduct side-by-side intercomparisons with test gas and ambient air samples – this makes the site a prime facility for intercomparison studies.

Services currently offered by the infrastructure:
1. Process studies in atmospheric chemistry
Scientists and research teams are invited to carry out their specific atmospheric chemistry research study at HPB. They are offered laboratory space in the guest scientist laboratory or at an appropriate outside location, and logistic support. Various successful research campaigns have been performed at HPB in recent years.
2. Know-how transfer
During the project and ongoing we expect research scientists, technicians and the participants of
intercomparisons (see below) to come to HPB to expand their (and our) experience with respect to trace gas and aerosol monitoring as well as process studies. They are offered support on scientific and technical issues, instruments, data quality, data evaluation and delivery to data centres. In the past, HPB has trained scientists and technicians from other stations and continuously contributes to GAWTEC, a routine training programme for some 15 participants from GAW stations worldwide.
3. Intercomparison activities
European monitoring sites will be invited to contribute in intercomparison experiments for NOxy compounds (see NA4). This directly addresses the needs formulated in international programmes (GAW, ACCENT, EMEP).
In synergy with GAW, EMEP, and NA4, this TNA aims at intercomparisons according to standardized quality objectives and standardized procedures. Thus, users benefit from this standardization process. Successful contribution in such intercomparisons will greatly support the quality of the data from various monitoring sites in Europe.

Description of work

Modality of access under this project:
Access is offered for 1. Participation in side-by-side intercomparison campaigns for measurements of oxides of nitrogen by on-line techniques according to GAW standardized procedures. These intercomparison campaigns will be carried out in close cooperation to GAW and EMEP, and corresponding stations in Europe performing such on-line measurements will be encouraged to apply for this TNA. The intercomparisons will be conducted in the guest scientist lab. Typically, intercomparison participants are expected to stay for 1 week, with set-up of the instruments on the first 2 days, intercomparison experiments on the following 3 days, and shut-down instruments and packing on the final day. Typically, intercomparisons with 5 participants are planned.
2. Measurement campaigns to study processes in atmospheric chemistry (trace gases and aerosol) or the (unattended) operation of automatic equipment for monitoring or instrument test purposes. Measurement campaigns are possible on short- and long-term scales. Thus, typical short-term studies are expected to last for less than 3 weeks. Longterm studies are envisioned where instruments are installed for several seasons to capture annual cycles of the measured quantity. In such studies, the researchers are expected to install and test their equipment initially in a 1-week period. Then, they will visit the site for instrument maintenance including calibration as needed.
A main advantage of the mountain station HPB is its easy accessibility by cars. This greatly facilitates all logistic issues of transportation and delivery times of technical equipment. The laboratory levels are reached by elevators. Access to the laboratories can generally be offered during usual working day times of 7:00 to 18:00, but for restricted periods this can be expanded.

Support offered under this project:
1. The intercomparisons will be conducted in the guest scientist lab at the common ring manifold. The HPB will provide laboratory space, and standard technical gases, test gas mixtures, reference instruments (depending on the target compounds) and HPB will report the results of the intercomparison.
2. For measurement campaigns, laboratory space in the guest scientist laboratory, technical support, and data from the GAW measurement programme are provided. Technicians can provide limited support for the instrument maintenance in unattended long-term studies.
Furthermore, the users will strongly profit from the extensive monitoring programme outlined above and from the expertise and experience of the scientists, engineers and technicians at the observatory. Users are introduced to the station by on site training.

Outreach of new users:
As scientists of the HPB (1) are members of international Expert Groups in GAW and thus cooperate in the implementation of these programmes, (2) contribute in current and recent EC projects such as MACC and EUCAARI, and (3) are closely related to leading atmospheric research in Europe, these scientists have a high reputation and they have access to the respective communities via home pages, round-letters and personal contact. With the intended intercomparison exercises they address the needs of existing infrastructures like GAW and EMEP. Thus, this TNA initiative is offered in response to specified and reported requirements of European infrastructures. Calls for these intercomparison activities are circulated using the established communication structure of these programmes. The TNA access opportunities to HPB are advertized via the ACTRIS website not only within the Consortium but also to enhance outreach to the European scientific community and beyond, as well as on the station website to provide potential new users with timely, comprehensive information on the facilities available as well as the current research activities.

Review procedure under this project:
The selection of users will be performed by a single TNA selection panel and is described under the general ACTRIS procedure in section 2.1.6.

Unit of Access:
One unit of access corresponds to 1 full research person-working day (rwd) by a user accessing the
infrastructure (the minimum acceptable access is half a day). The access includes the use of the general infrastructure, on-site logistic support by the infrastructure staff, as well as technical and scientific support related to the use of the facility and data analysis. A confirmation of visit indicating the total quantity of access per user, countersigned by the access provider, is provided after each access.

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