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Title:Aerosol dust absorption : measurements with a reference instrument (PTAAM-2[lambda]) and impact on the climate as measured in airborne JATAC/CAVA-AW 2021/2022 campaigns
Authors:ID Yus-Díez, Jesús (Author)
ID Drinovec, Luka (Author)
ID Bervida, Marija (Author)
ID Jagodič, Uroš (Author)
ID Žibert, Blaž (Author)
ID Močnik, Griša (Author), et al.
Files:.pdf EGU24-17933-print.pdf (291,71 KB)
MD5: 65FFF34E57C11E3925252E36E7C82396
 
URL https://meetingorganizer.copernicus.org/EGU24/EGU24-17933.html
 
Language:English
Work type:Unknown
Typology:1.12 - Published Scientific Conference Contribution Abstract
Organization:UNG - University of Nova Gorica
Abstract:Aerosol absorption coefficient measurements classically feature a very large uncertainty, especially given the absence of a reference method. The most used approach using filter-photometers is by measuring the attenuation of light through a filter where aerosols are being deposited. This presents several artifacts, with cross-sensitivity to scattering being most important at high single scattering albedo with the error exceeding 100%. We present lab campaign results where we have resuspended dust samples from different mid-latitude desert regions and measured the dust absorption and scattering coefficients, their mass concentration and the particle size distribution. The absorption coefficients were measured with two types of filter photometers: a Continuous Light Absorption Photometers (CLAP) and a multi-wavelength Aethalometer (AE33). The  dual-wavelength photo-thermal interferometer (PTAAM-2λ) was employed as the reference. Scattering coefficients were measured with an Ecotech Aurora 4000 nephelometer. The mass concentration was obtained after the weighting of filters before and after the sampling, and the particle size distribution (PSD) was measured by means of optical particle counters (Grimm 11-D).Measurements of the scattering with the nephelometer and absorption with the PTAAM-2λ we obtained the filter photometer multiple scattering parameter and cross-sensitivity to scattering as a function of the different sample properties. Moreover, by determining the mass concentration and the absorption coefficients of the samples, we derived the mass absorption cross-sections of the different dust samples, which can be linked to their size distribution as well as to their mineralogical composition.The focus of the JATAC campaign in September 2021 and September 2022 on and above Cape Verde Islands was on the calibration/validation of the ESA Aeolus satellite ALADIN lidar, however, the campaign also featured secondary scientific climate-change objectives. As part of this campaign, a light aircraft was set-up for in-situ aerosol measurements. Several flights were conducted over the Atlantic Ocean up to and above 3000 m above sea level during intense dust transport events. The aircraft was instrumented to determine the absorption coefficients using a pair of Continuous Light Absorption Photometers (CLAPs) measuring in the fine and coarse fractions separately, with parallel measurements of size distributions in these size fractions using two Grimm 11-D Optical Particle Size Spectrometers (OPSS). In addition, we performed measurements of the total and diffuse solar irradiance with a DeltaT SPN1 pyranometer.The combination of the absorption and PSD with source identification techniques enabled the separation of the contributions to  absorption by dust and black carbon. The atmospheric heating rate of these two contributions was determined by adding the irradiance measurements. Therefore, the integration of the results from the Using laboratory resuspension experiments  to interpret the airborne measurements is of great relevance for the determination  of the radiative effect of the Saharan Aerosol Layer as measured over the tropical Atlantic ocean.
Keywords:black carbon, mineral dust, Saharan dust, atmospheric heating rate, climate change, airborne measurements
Publication status:Published
Publication version:Version of Record
Year of publishing:2024
Number of pages:1 spletni vir
PID:20.500.12556/RUNG-8939 New window
COBISS.SI-ID:189259779 New window
UDC:502.3/.7
DOI:10.5194/egusphere-egu24-17933 New window
NUK URN:URN:SI:UNG:REP:3ZVDRXTG
Publication date in RUNG:18.03.2024
Views:576
Downloads:2
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Record is a part of a monograph

Title:EGU General Assembly 2024 : Vienna, Austria & online, 14-19 April 2024
Place of publishing:Göttingen
Publisher:EGU - European Geosciences Union
Year of publishing:2024
COBISS.SI-ID:189198083 New window

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License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

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