Very intensive dust outbreak detected in Slovenia
Ljubljana, March 2020.
At the end of March 2020, very intensive dust event was detected in Ljubljana with the peak of concentrations higher than 350 µg/m3. The event started on March 27 in the morning and lasted for 3 days until first precipitation washed out the atmosphere.
Different model predictions and back trajectory calculation showed that dust cloud not come from south directly from Sahara, but it was transported from the east. However, the determination of the exact source region is very uncertain. Some predictions showed that dust cloud was travelled from Sahara through Middle East and Black see. Other predictions marked the deserts in Iran as source region. The estimated MAC value for the event was 0.09 m2 g−1 which is almost 3 times lower than usual values for the dust from Saharan origin.
Source of image: https://www.ventusky.com/.
Manuscript with DNAAP methodology was submitted for publication
Ljubljana, December 2019.
The manuscript with the description of the DNAAP methodology was prepared. The title of the manuscript is A new optical-based technique for real-time measurements of mineral dust concentration in PM10 using a virtual impactor and it was submitted for publication in the scientific journal Atmospheric Measurement Techniques (AMT). The manuscript contains the detailed description and the validation of the DNAAP methodology. Also, the discussion about MAC determination is given.
Update: The manuscript was published on July 15, 2020.
Source of image: https://doi.org/10.5194/amt-13-3799-2020.
DNAAP methodology was presented on EAC 2019
Gothenburg, August 2019.
European Aerosol Conference (EAC) was held in Gothenburg, Sweden, from 25 to 30 August 2019. The methodology for detecting atmospheric mineral dust based on measuring optical absorption was presented on AEC 2019 by Luka Drinovec from Josef Stefan Institute (IJS). Two aethalometers are required for efficiently detection of mineral dust concentration with two different size selecting inlets – one with PM1 inlet and the other one with virtual impactor inlet.
The mineral dust is usually presented in coarse mode therefore the virtual impactor inlet is used to concentrate the course mode of the particulate matter. This offers us to further study optical properties of mineral dust into details. The methodology was tested on data from background station Agia Marina Xyliatou on Cyprus in April and May 2016 when several intense mineral dust events were observed.
The methodology can be run on-line with time resolution up to few minutes. To our knowledge, this is the first method for detecting the concentrations of the ambient mineral dust that can be run in real time.
Airplane measurements over Cyprus and Barcelona in June 2019
Cyprus, Barcelona, June 2019.
At the end of June and start of July 2019, there was significant Saharan dust outbreak in the Mediterranean and an ideal opportunity to study optical properties of mineral dust into more details. The ground measurements were combined with additional airplane sampling during this period.
For this purpose, the ultralight airplane was equipped with aethalometer which offered us to continuously measure the absorption properties of mineral particles and to sample the vertical distribution. The airplane flew through Saharan dust cloud and it captured useful information for later analyses.
Source of image: http://glwf2019.worldgreenflight.com/.
DNAAP campaign start
Cyprus, Barcelona, February 2019.
The DNAAP campaign started in February 2019 with the installation of instruments on Cyprus and Barcelona. All stations were equipped with two Aethalometers AE33 and one virtual impactor.
Three stations were installed in Barcelona and its surroundings (Barcelona – BCN, Montseny - MSY and Montsec - MSA) and two on Cyprus (Nicosia - NI and Agia Marina Xyliatou - AMX). MSY, MSA and AMX are background stations, while BCN and NI are urban background stations.