Optical Measurement and Aerosol Filter Loading for Climate Studies (Aethalometer)

Transcription

1 Optical Meaurement and Aerool Filter Loading for Climate Studie (Aethalometer) Paulo Fialho

2

3 Azore Archipelago Central Group N São Jorge Gracioa Terceira Faial Pico

4 Objective Develop methodologie to compenate for apparent aborption caued by cattering and hadow due to the ue of a filter matrix upport. Development of an improved compenation technique for the AE attenuation coefficient, ANT-comp., t f,, t t comp ab, Correlation of the ANT-comp, with MAAP aborption coefficient meaurement, ab, to evaluate the AE C ref (hadow effect) and R (cattering) correction for the ampled aerool. comp, t ab, t C R ref

5 S I 0 () I ln I S 0 I S S C 0 aerool Aethalometer R L S and I ln R I R 0 I0 I S 0 I I S ( ) ln I R Flow where L SpotArea aerool R R 0 SpotArea Flow I R (); I R0 () I S (); I S0 ()

6 Soot (Black Carbon) courtey of Dr. Claudio Mazzoleni from MTU

7 Different Spot Time Loading Experiment Setup All the intrument ued in the experiment ampled imultaneouly from a common chamber with continuouly refrehed dried ambient air. Four High Senitivity (HS) Aethalometer (AE) (370, 470, 520, 590, 660, 880, 950 nm) Four Extended Range (ER) Aethalometer (AE) (370, 470, 520, 590, 660, 880, 950 nm) Three Multi Angle Aborption Photometer (MAAP) (637 nm)

8 Different Spot Time Loading Experiment Setup Aethalometer were divided in three different group ampling with a time difference of 3 hour but with the ame flow rate. AE-31 4 dm 3 /min HS#160; ER#408 HS#679; ER#427 HS#268; ER#945 MAAP where ued a a econdary reference method for aborption coefficient, ab (637 nm). MAAP dm 3 /min #080; #012; #140

9 Aethalometer (AE) Working Equation, t SpotArea Flow t, t, t t t S BC m g m nm 1 3, t; Mm C t ; ng. m S Multi Angle Aborption Photometer (MAAP) ab BC i the BC aerool pecific aborption cro ection CBC ng. m 6.5 m / g Mm 1000 BC

10 Aethalometer ( = 660 nm)

11 Aethalometer ( = 660 nm) Virkkula et al., (2007),J. Air & Wate Manage. Aoc., 57, t 1 k, t, t t correct,,

12 Aethalometer ( = 660 nm)

13 Comp Comp Comp Comp Comp Comp Comp Comp, t f,, t, t f,, t 1 k, t, t,ref. AE a AE# 1 k, t;ae#, t;ae# 0, t;er#945 a0er#945 1 k, t;er#945, t;er#945, t;er#945 a0hs#160 1 k, t;hs#160, t;hs#160, t;er#945 a0hs#268 1 k, t;hs#268, t;hs#268, t;er#945 a0hs#679 1 k, t;hs#679, t;hs#679, t;er#945 a0er#408 1 k, t;er#408, t;er#408, t;er#945 a ER#427 1 k, t;er#427, t;er#427 0 ER#945 wa chooe a the reference Aethalometer a 0 (ER#945) = 1.00 N = Standard Error = 1.5 Mm -1 (nm) k() AE# a 0 (AE#) ER# HS# HS# HS# ER# ER#

14 a 0 (AE#) k k where k nm r (m)

15 Comp Comp Comp Comp Comp Comp Comp, t;ref. AE a0ae# f,, t; AE#, t;ae#, t;ae# f,, t; AE# 1 k, t,er#945 a ER#945, t,er#945 a HS#160, t,er#945 a HS#268, t,er#945 a HS#679, t,er#945 a ER#408, t,er#945 a ER#427 k = 1.51±0.15 nm N = Standard Error = 1.5 Mm , t,er#945 1 k, t,hs#160 1 k, t,hs#268 1 k, t,hs#679 1 k, t,er#408 1 k, t,er#427 1 k AE# a 0 (AE#) ±0.004 ER# HS# HS# HS# ER# ER# , t,er#945, t,hs#160, t,hs#268, t,hs#679, t,er#408, t,er#427

16 Aethalometer ( = 660 nm)

17 Aethalometer ( = 660 nm)

18 Aethalometer ( = 660 nm)

19 Aethalometer ( = 660 nm)

20 MAAP ( = 637 nm)

21 MAAP ( = 637 nm)

22 Correlating MAAP with AE MAAP #140 data wa elected a the reference Data in Standard Preure ( mbar) and Temperature ( K) MAAP #080 i too noiy MAAP #012 i lightly different from the other two and have le data then MAAP #140. AE31 ER#945 data i ued a the reference data wa convert to 637 nm by uing the relation, were, a = 1.11±0.15 -comp comp caled to Standard Preure and Temperature a

23 AE31(ER#945) v. MAAP(#140) ( = 637 nm), t ab tcref comp, with comp C ref Std. Err Mm r N ab

24 ab AE comp /

25 AE31(ER#945) and MAAP(#140) ( = 637 nm) -comab MAAP AE31 -comp AE31 R R C MAAP C ref ref ab

26 AE31(ER#945) and MAAP(#140) ( = 637 nm) R C ref -comp ab AE31 MAAP ab

27 Summary Information comp f f,, 1 k k nm abae comp C ref Aethalometer HS# ±0.019 HS# ±0.021 HS# ±0.023 HS# ±0.021 ER# ±0.026 ER# ±0.024 ER# ±0.026 Average 4.41±0.38 (9%) C C ref

28 Aethalometer All Experiment ( = 660 nm)

29 Aethalometer All Experiment ( = 660 nm)

30 Aethalometer All Experiment ( = 660 nm)

31 Aethalometer All Experiment ( = 660 nm)

32 Aethalometer v. MAAP#140 All Experiment ( = 637 nm)

33 Time Serie All Experiment ( = 637 nm)

34 Involved Intitution Aerool d.o.o., Kamnika 41, SI-1000, Ljubljana, Slovenia Department of Optic and Quantum Electronic, Univerity of Szeged, H-6701 Szeged, Hungary Environmental Radioactivity Laboratory, Intitute of Nuclear Technology - Radiation Protection N.C.S.R. "Demokrito", Ag. Parakevi Attiki, Greece Finnih Meteorological Intitute, Climate Change Unit, Helinki, Finland ISAC - CNR, Via Gobetti 101, Bologna, Italy JRC, Ipra ite, via E. Fermi, 1, I Ipra, Italy Leibniz Intitute for Tropopheric Reearch, Leipzig, Germany Netherland Organiation for Applied Scientific Reearch, TNO, Utrecht, The Netherland Univerity of Azore, P Terra Cha, Portugal Univerity of Helinki, Dept of Phyic, Helinki, Finland Acknowledge EC project EUSAAR; Azore Regional Secretariat for Science and Technology (M3.2.1/I/082/2010) for the Portuguee participation Eurotar (E!4825) for the Slovene participation.