An assessment of the AERONET aerosols size distribution by comparison with in-situ measurements at Izaña Global Atmospheric Watch Observatory:

Transcription

1 Instituto Nacional de Meteorología-INM University of Huelva National Institute for Meteorology An assessment of the AERONET aerosols size distribution by comparison with in-situ measurements at Izaña Global Atmospheric Watch Observatory: An analysis from clean-air to high Saharan dust concentration conditions Sergio Rodríguez 1,2,*, Emilio Cuevas 1, Inés Toledo 2, Sara Basart 1, Philippe Goloub,3 1, Izaña Atmospheric Observatory, INM, Tenerife, Canary Islands-Spain. 2, University of Huelva, Departament of Geology, Huelva, Spain. 3, Université des Sciences et technologies de Lille, Observatoire de Recherche sur les Aérosols "PHOTONS / AERONET", France * srodriguez@ija.csic.es

2 Objectives: Studying the size distribution of free troposphere aerosols subtropical North Atlantic 1. Column (AERONET) versus in-situ measurements 2367m.a.s.l. Izaña 2. Clean-Air to Saharan dust conditions

3 1. Izaña GAW station 2. Methods 3. column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcol and Vis 4. Conclusions

4 1. Izaña GAW station 2. Methods 3. column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcol and Vis 4. Conclusions

5 1. Izaña GAW station Tenerife Izaña, 2367masl

6 1. Izaña GAW station Saharan dust Prospero et al.(22). Reviews of Geophysics, 4, /2/2RG95. July Tenerife Izaña, 2367masl

7 1. Izaña GAW station AOD July ( ) Torres et al.(22). Journal of Atmospheric Science, 59, Tenerife Izaña, 2367masl

8 1. Izaña GAW station

9 1. Izaña GAW station Teide 3718 free troposphere conditions 2367 Rodríguez et al.(24). Atmospheric Environment, 38,

10 1. Izaña GAW station

11 1. Izaña GAW station 7% of AOD data availability in AERONET Inversion Layer location Top Bottom Rodríguez et al.(24). Atmospheric Environment, 38,

12 1. Izaña GAW station aerosol regional background: very low concentrations.4 35th =.12 column th =.82 in-situ AOD 675nm.3.2 5th = th =.569 9th = th = th = PM1, µg/m th = th = th = th = th = Percentile, th Percentile, th

13 1. Izaña GAW station.8 3 AOD 675nm PM1, µg/m

14 1. Izaña GAW station dv/dlogd (.3-2µm): column dv/dlogd (.3-2µm): in-situ Saharan dust Saharan dust 2367

15 1. Izaña GAW station clean air saharan dust event

16 1. Izaña GAW station clean air saharan dust event

17 1. Izaña GAW station 2. Methods 3. column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcolunm and Vin-situ 4. Conclusions

18 2. Methods Aerosol size distribution -column integrated: CIMEL-AERONET LEVEL 1.5 and LEVEL 2. SPHERICAL PARTICLE MODEL ALMUCANTAR RETRIEVALS dv/dlogd (.1-2µm diameter) µm 3 /cm 2 7-July-25 to 31-May-27 V (.3-1µm) V (.3-1µm) V (1-1µm) -in-situ: Optical Particle Counter dn/dlogd (.3-2µm) Spherical particles dv/dlogd (.3-2µm) µm 3 /cm 3 V (.3-1µm) V (.3-1µm) V (1-1µm)

19 1. Izaña GAW station AERONET, since 24 AOD, size distribution, other products

20 1. Izaña GAW station dn/dlogd (.3-2µm) OPC: since July 25 PM1, PM2.5 levels & chemistry: since 22 dn/dlogd (.5-2µm) APS: since November 26 BC and σ ap : since November 26 N(>3nm): since November 26

21 1. Izaña GAW station 2. Methods 3. Results: column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcol and Vis 4. Conclusions

22 3.1 day-to-day variations 1 6 µm 3 /cm column V(.3-1µm) hourly concentrations 1433 hourly data 24 in-situ hourly data µm 3 /cm

23 3.1 day-to-day variations V(.3-1µm) daylight (1-17h) concentrations 12 in-situ column 285 data 285 data 2 µm 3 /cm µm 3 /cm

24 3.1 day-to-day variations µm 3 /cm in-situ 285 data V(.3-1µm) daylight (1-17h) concentrations fine column 285 data µm 3 /cm

25 3.1 day-to-day variations µm 3 /cm in-situ 285 data V(1-1µm) daylight (1-17h) concentrations coarse column 285 data µm 3 /cm

26 3.1 day-to-day variations correlation coefficient N=285 daylight averaged data column V(.31-1µm) V(.3-1µm) V(1-1µm) V(.31-1µm).76 in-situ V(.3-1µm).66 V(1-1µm).76

27 1. Izaña GAW station 2. Methods 3. column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcolunm and Vin-situ 4. Conclusions

28 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

29 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

30 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

31 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

32 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

33 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

34 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

35 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

36 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

37 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

38 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

39 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

40 3.2 events 8 V(.3-1µm) in-situ, µm 3 /cm 3 4 July August 2 1 column 1 6 µm 3 /cm 2 25

41 1. Izaña GAW station 2. Methods 3. column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcolunm and Vin-situ 4. Conclusions

42 3.3 size distributions V percentile 2th 1th 2th 3th 4th 6th 7th 8th 8th 9th 9th 95th 95th 1th dv/dlogd % V(1-1µm)/V(.3-1µm) data consistency?

43 3.3 size distributions statistical consistency column 1 6 µm 3 /cm V(.3-1µm) th= th= th= th=1.64 5th= th=.119 1th=.95 in-situ, µm 3 /cm percentiles 95th= th= th= th=5.15 5th=.73 25th=.26 1th=.11

44 statistical consistency column 1 6 µm 3 /cm th V(.3-1µm) y =.2x R 2 = in-situ, µm 3 /cm 3

45 column statistical consistency 1 6 µm 3 /cm 2 column 1 6 µm 3 /cm V(.3-1µm) in-situ, µm 3 /cm 3 V(.3-1µm) y =.2x R 2 = in-situ, µm 3 /cm V(1-1µm) in-situ

46 column statistical consistency 1 6 µm 3 /cm 2 column 1 6 µm 3 /cm V(.3-1µm) V(.3-1µm) y =.2x R 2 =.97 in-situ, µm 3 /cm Statistically consistent compare them in-situ, µm 3 /cm V(1-1µm) in-situ

47 3.3 size distributions Mean July 25 May 27 in-situ, µm 3 /cm dv/dlogd µm 3 /cm 2 column particle diameter, µm Contribution of 1-1µm to V(.3-1µm) in-situ 74% column 88%

48 3.3 size distributions 95th 1th 1 25 µg/m 3 High Saharan dust concentrations 9th 95th 6 1 µg/m 3 8th 9th 2 6 µg/m 3 Saharan dust 7th 8th 9 2 µg/m 3 4th 6th 1 4 µg/m 3 2th 3th.5.9 µg/m 3 2th 1th.15.3 µg/m 3 clean air conditions

49 3.3 size distributions 2th 1th.15.3 µg/m 3 in-situ, µm 3 /cm ? particle diameter, µm 1 6 µm 3 /cm 2 column North Atlantic free troposphere aerosols

50 3.3 size distributions 2th 3th.5.9 µg/m 3 in-situ, µm 3 /cm 3 dv/dlogd particle diameter, µm 1 6 µm 3 /cm 2 column North Atlantic free troposphere aerosols

51 3.3 size distributions 3th 4th 1 2 µg/m 3 in-situ, µm 3 /cm 3 dv/dlogd particle diameter, µm 1 6 µm 3 /cm 2 column North Atlantic free troposphere aerosols

52 3.3 size distributions 4th 6th 2 4 µg/m 3 in-situ, µm 3 /cm 3.8 dv/dlogd particle diameter, µm 1 6 µm 3 /cm 2 column North Atlantic free troposphere aerosols

53 3.3 size distributions 7th 8th 9 2 µg/m 3 in-situ, µm 3 /cm 3 dv/dlogd particle diameter, µm 1 6 µm 3 /cm 2 column Saharan dust influence

54 3.3 size distributions 8th 9th 2 6 µg/m 3 in-situ, µm 3 /cm 3 dv/dlogd particle diameter, µm 1 6 µm 3 /cm 2 column Saharan dust influence

55 3.3 size distributions 9th 95th 6 1 µg/m 3 in-situ, µm 3 /cm 3 dv/dlogd particle diameter, µm µm 3 /cm 2 column Saharan dust

56 3.3 size distributions 95th 1th 1 2 µg/m 3 in-situ, µm 3 /cm 3 dv/dlogd particle diameter, µm 1 6 µm 3 /cm 2 column Saharan dust

57 3.3 size distributions 1. correlation coefficient size distribution shape th 9-95 th 8-9 th 7-8 th 4-6 th 3-4 th 2-3 th 2-1 th

58 3.3 size distributions 1 Coarse contribution to V(.3-1µm) V(1-1µm) / V(.3-1µm) Column, % In-situ, % clean air Saharan dust conditions

59 3.3 size distributions Column, % Coarse contribution to V(.3-1µm) V(1-1µm) / V(.3-1µm) y = 1.23x 1:1 y =.59x In-situ, % clean air Saharan dust conditions

60 3.3 size distributions dv/dlogd th 16 Coarse contribution to V(.3-1µm) 3 8 V(1-1µm) / V(.3-1µm) Column, % :1 1:1 y = 1.23x y =.59x in-situ, µm 3 /cm th th µm 3 /cm 2 column In-situ, %.4.5 clean air Saharan dust conditions particle diameter, µm

61 1. Izaña GAW station 2. Methods 3. column versus in-situ aerosol measurements -day-to-day variations -events -size distributions -relationship between Vcolunm and Vin-situ 4. Conclusions

62 3.4 Relationship between Vcolunm and Vin-situ 24 V(.3-1µm) in-situ, µm 3 /cm V(1-1µm) 1 5 column 1 6 µm 3 /cm 2 4 V(.3-1µm) JASOND JFMAMJ J ASOND JF Summer Summer monthly means MAM.

63 3.4 relationship between Vcol and Vis column 1 6 µm 3 /cm V(.3-1µm) y = x monthly means R2 =.68 column 1 6 µm 3 /cm V(1-1µm) coarse y = x R2 = column 1 6 µm 3 /cm V(.3-1µm) fine y = x R2 = in-situ, µm 3 /cm 3

64 4. Summary 1. in-situ column: into the Saharan dust plume in the free troposphere 2. in-situ vs column size distribution: consistent high Saharan dust concentrations coarse mode 3. aerosol load? clean air North Atlantic free troposphere accumulation mode 4. aerosol size distribution: homogeneous vertical distribution in the mid to high free troposphere 5. Izaña Observatory: suitability for comparing modelling and remote sensing with experimental measurements

65 clean air saharan dust event Thanks