Measurements of aerosol optical properties at the Station for - - PowerPoint PPT Presentation

▶
measurements of aerosol optical properties at the station
SMART_READER_LITE
LIVE PREVIEW

Measurements of aerosol optical properties at the Station for - - PowerPoint PPT Presentation

Feb 10, 2023 35 likes •178 views

Measurements of aerosol optical properties at the Station for Measuring EcosystemAtmosphere Relations (SMEAR II), a boreal forest site in Finland A. VIRKKULA 1,2 , KRISTA LUOMA 2 , P. AALTO 2 , T. PETJ 2 , M. KULMALA 2 1 Finnish

slide-1
SLIDE 1

Measurements of aerosol optical properties at the Station for Measuring Ecosystem–Atmosphere Relations (SMEAR II), a boreal forest site in Finland

  • A. VIRKKULA1,2, KRISTA LUOMA2, P. AALTO2, T. PETÄJÄ2, M. KULMALA2

1Finnish Meteorological Institute, FI-00560, Helsinki, Finland 2Department of Physics, University of Helsinki, FI-00014, Helsinki, Finland

slide-2
SLIDE 2

Where is it compared with the IASOA sites? SMEAR II, Hyytiälä Finland 61°50’47”N, 24°17’42”E, 181 m AMSL

slide-3
SLIDE 3

SMEAR II-station (boreal forest, countryside)

http://www.atm.helsinki.fi/SMEAR/

slide-4
SLIDE 4

For a detailed description of the site and all measurements see http://www.atm.helsinki.fi/SMEAR/

Aerosol cottage

  • size distributions
  • scattering
  • absorption
  • filter sampling
  • hygroscopicity
  • CCNC
  • volatility
  • ...
slide-5
SLIDE 5

5

slide-6
SLIDE 6

6

In situ aerosol optics measurements at SMEAR II Scattering coefficient Nephelometer, TSI 3563 2006-06-01 → Absorption coefficient Magee Scientific, Aethalometer AE-31 2004-12-08 → RR, 3λ Particle Soot Absorption Photometer (PSAP) 2011-10-12 – 2016-03-10 Thermo Electron CARUSSO / MAAP 5012 2012-11-01 → Extinction coefficient Aerodyne Research CAPS PMex Monitor 2012-05-01 →

slide-7
SLIDE 7

7

Virkkula et al.: Aerosol optical properties at SMEAR II, Hyytiälä, Finland, ACP, 2011

Trajectory statistics of scattering and absorption coefficients at λ = 550 nm and the Ångström exponent of scattering. Average value observed at SMEAR II from 13 October 2006 to 31 may 2009 when backtrajectories have crossed each grid cell. Some old results

σsp σap αsp

SMEAR II

slide-8
SLIDE 8

8

Year Year New results, Krista Luoma’s MSc thesis Decreasing trend

slide-9
SLIDE 9

9

Cref Median Mean Std No ATN correction 3.15 3.23 1.60 Weingartner 3.36 3.46 1.65 Arnott 4.05 4.28 2.23 Iterated Arnott 3.17

  • Virkkula

3.27 3.36 1.65 Collaud Coen 3.26 3.31 1.75 New results, Krista Luoma’s MSc thesis Cref from AE vs MAAP

slide-10
SLIDE 10

10 Backman et al.: On Aethalometer measurement uncertainties and multiple scattering enhancement in the Arctic. Manuscript submitted to AMT Discussions, 2016

slide-11
SLIDE 11

11

Hyytiälä IASOA sites

slide-12
SLIDE 12

12

Cref Collaud Coen Weingartner No ATN correction Cref Cref Month New results, Krista Luoma’s MSc thesis

slide-13
SLIDE 13

13

Month Month New results, Krista Luoma’s MSc thesis Effective complex refractive index by iterating scattering & absorption vs. size distributions Real Imaginary

slide-14
SLIDE 14

CONNECTIONS TO IASOA?

  • Study of Arctic vs. boreal sites?
  • Statistics of episodes observed at SMEAR II, Pallas

and maybe up to Ny Ålesund?

  • Other ways?