Jungfraujoch National Facility

(Version with all figures shown together)

Live webcam and meteorology data

Webcam source: SWITCH (www.switch.ch). Meteorology data provided by partner MeteoSwiss.

Aerosol number concentrations

Time series of total aerosol particle number concentrations. The measurements are performed with a Condensation Particle Counter (CPC) and a Scanning Mobility Particle Sizer (SMPS; integrated concentrations) at the Jungfraujoch Observatory (Sphinx), as well as with a CPC at the nearby East Ridge site. Measurements of Cloud Condensation Nuclei Concentrations (CCNC; at a supersaturation of 1%) are currently unavailable. Responsible partner: PSI.

Concentrations of Ice-Nucleating Particles (INPs)

Concentrations of Ice-Nucleating Particles (INPs) measured from Jungfraujoch Observatory. INPs are a small but important part of the total aerosol — they are the particles responsible for ice formation in clouds. Responsible partner: IAC, ETH.

Aerosol number and volume size distributions

The size distributions of aerosol particles at Jungfraujoch Observatory measured with a mobility particle size spectrometer (MPSS) and an aerodynamic particle sizer (APS). The top panel shows the size distributions weighted by aerosol number, which emphasizes the smaller particles that are present, while the bottom panel shows the same distributions weighted by aerosol volume, which emphasizes the larger particles. The colours indicate the number/volume concentrations of particles of a given size: reds mean high particle concentrations while blues indicate low particle concentrations. The particle sizes are indicated on the y-axis scale (mobility diameter). Responsible partner: PSI.

Aerosol optical properties: scattering and absorption

Time series of aerosol optical properties at different wavelengths measured at Jungfraujoch Observatory. The ability of aerosol particles to scatter light is represented by total and backwards-hemispheric light scattering coefficients measured by two separate instruments: a TSI and an AirPhoton nephelometer. Light absorption by aerosol particles is shown as aerosol absorption coefficients measured with a 7-wavelength aethalometer (AE33). Responsible partner: PSI.

Black carbon concentrations

Black carbon, or soot, is an important part of the total aerosol because it absorbs light and causes atmospheric warming. Black carbon is also a good tracer for pollution from vehicles and wildfires. At Jungfraujoch Observatory and the nearby East Ridge site black carbon mass concentrations are measured by absorption photometers (MAAP, AE33). Responsible partner: PSI.

Aerosol chemical composition

Mass concentrations of chloride, ammonium, nitrate, organics, and sulphate measured at Jungfraujoch with an Aerosol Chemical Speciation Monitor (ACSM). These measurements help us to determine the types of aerosols found at the Jungfraujoch and where they come from. The last 30 days of measurements along with ACSM instrument diagnostics can be viewed here. Responsible partner: PSI.