Aerosol monitoring program at Izaña Atmospheric Observatory
The objective is to perform a continuous monitoring of the aerosol properties related to climate forcing and air quality on multi-decadal time scales in the subtropical North Atlantic free troposphere. For this purpose, particle size, chemical composition and optical properties at monitored in a continuous basis. This project is performed within the framework of the Global Atmospheric Watch (GAW) program of the World Meteorological Organization.
View of the PARTILAB building.
Inlets of the PARTILAB.
Two of our particle samplers are installed within independent racks:
View of two of the sampler in the PARTILAB.
View of the main inlet of the PARTILAB.
View of the instrumentation used for on line aerosol measurements.
Number concentrations of particles coarser 3 nm is measured with a TSI™ Ultrafine Condensation Particle Counter model 3025A.
|Size distribution of particles 9 – 437 nm diameter is measured with a TSI™ Scanning Mobility Particle Sizer (SMPS). A CPC model 3010 and a DMA model 3081 are used.||
|Size distribution of particles 0.5 – 20 µm diameter, measured with a TSI™ Aerodynamic Particle Sizer (APS) model 3321.||
Mass concentrations and chemical composition of Total Suspended (TSP), less than 10 microns (PM10) and less than 2.5 microns (PM2.5) particles is determined by sampling on quartz micro fiber filter.
Mass concentration is determined by gravimetry in our laboratory.
Chemical composition allows determining the concentrations of mineral dust, sea salt, sulphate, nitrate, ammonium, organic carbon, elemental carbon, trace elements.
|Absorption coefficient at 1 wavelength (630 nm light), due to particles smaller than 10 microns, is measured with a Thermo™ MultiAngle Absorption Photometer (MAAP). A PM10 impactor is placed in the inlet.||
|Total-scattering (7-170 degrees) and back-scattering (90-170 degrees) due to particles smaller than 10 microns, is measured at 3 wavelengths: blue (450 nm), green (550 nm) and red (700 nm). A TSI™ Integrating Nephelometer model 3563 is used. A PM10 impactor is placed in the inlet.||
More details on the measurements are provided at GAWSIS
Saharan dust transport mainly occurs in summer, when the Saharan Air Layer is westward transported across the Atlantic by passing over the Canary Islands. TSP, PM10 and PM2.5 concentrations are Izaña are usually extremely low due to the clean air conditions in the free troposphere conditions (e.g., the PM10 and PM2.5 median for the 2004-2008 period are equal to 3.5 and 2.2 µg/m3, respectively). Increases in the aerosol mass concentrations are only recorded during Saharan dust transport episodes. High TSP, PM10 and PM2.5 concentrations are only recorded in summer due to dust transport.
Monthly average values of PM10 and PM2.5 concentrations.
Global Aerosol Optical Depth. Red circle highlights the location of Izaña in the Northern edge of the Saharan Air Layer.
Hourly values of the total scattering coefficient at three wavelengths (700, 550 and 450 nm) and of the PM10 particles concentration.
Daily evolution for every month of, relative humidity (RH), water vapor (H2O), temperature (ºC), and the concentrations of particles with a diameters within the range 3-10nm (N3-10), higher than 10nm (N10) and higher than 3 nm (N3).
Picture of the northern side of Tenerife (view from Izaña Observatory) showing how the terrain of the island emerges above the marine stratocumulus cloud layer and enters in the low free troposphere.
5-minute values of the dN/dlogD size distribution during a new particle formation event.
|Scientist of the MINATROC project||August 2003|
|Dr. S. Castillo||Institute of Earth Sciences “Jaume Almera”, CSIC
|Prof. J. M. Prospero||RSMAS-University of Miami||August 2005|
|Dr. K. Kandler||Darmstadt University of Technology||July 2005|
|Dr. M. Gil and Mr. J.F. López||INTA||July 2005|
|Dr. M. Gil and Mr. J. Andrey||INTA||July 2006|
|Dr. T. Tuch and A. Nowak||World Calibration Centre for Aerosol Physics||November 2006|
|Isabel García Alvarez||University of La Laguna||January – June 2009|
|S. Scheidt||University of Pittsburgh||July 2009|
|Fluvio Amato||IDAEA-CSIC||July 2010|
|Yvonne Boose , Larissa Lacher, Berko Sierau||Institute for Atmospheric and Climate Science of Zürich (ETH)||July-August 2013|
|Susan Schmidt||Max Planck Institute for Chemistry (MPI-C)||July-August 2013|
|Yvonne Boose , Fabian Mahrt, Berko Sierau||Institute for Atmospheric and Climate Science of Zürich (ETH)||July-August 2014|
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