Polar Ozone and Aerosol Measurement Experiment (POAM-II)

1994 ◽  
Author(s):  
Richard M. Bevilacqua ◽  
Eric P. Shettle ◽  
John S. Hornstein ◽  
Philip R. Schwartz ◽  
Davidson T. Chen ◽  
...  
Keyword(s):  
Aerosol Measurement ◽  
Measurement Experiment ◽  
Polar Ozone

scholarly journals The Finokalia Aerosol Measurement Experiment – 2008 (FAME-08): an overview

2010 ◽  
Vol 10 (3) ◽  
pp. 6641-6679 ◽  
Author(s):  
M. Pikridas ◽  
A. Bougiatioti ◽  
L. Hildebrandt ◽  
G. J. Engelhart ◽  
E. Kostenidou ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Organic Aerosol ◽  
Water Soluble ◽  
Back Trajectory ◽  
Aerosol Composition ◽  
Air Masses ◽  
The Balkans ◽  
Aerosol Measurement ◽  
Aerosol Mass Concentration ◽  
Measurement Experiment

Abstract. A month (4 May to 8 June 2008) of ambient aerosol, air ion and gas phase sampling (Finokalia Aerosol Measurement Experiment 2008, FAME-08) was conducted at Finokalia, on the island of Crete, Greece. The purpose of the study was to characterize the physical and chemical properties of aged aerosol and to investigate new particle formation. Measurements included aerosol and air ion size distributions, size-resolved chemical composition, organic aerosol thermal volatility, water uptake and particle optical properties (light scattering and absorption). Statistical analysis of the aerosol mass concentration variations revealed the absence of diurnal patterns suggesting the lack of strong local sources. Sulfates accounted for approximately half of the particulate matter less than 1 micrometer in diameter (PM1) and organics for 26%. The PM1 organic aerosol fraction was highly oxidized with 80% water soluble. The supermicrometer particles were dominated by crustal components (50%), sea salt (24%) and nitrates (16%). The organic carbon to elemental carbon (OC/EC) ratio correlated with ozone measurements but with a one-day lag. The average OC/EC ratio for the study period was equal to 5.4. For three days air masses from North Africa resulted in a 6-fold increase of particulate matter less than 10 micrometers in diameter (PM10) and a decrease of the OC/EC ratio by a factor of 2. Back trajectory analysis, based on FLEXPART footprint plots, identified five source regions (Athens, Greece, Africa, other continental and marine), each of which influenced the PM1 aerosol composition and properties. Marine air masses had the lowest PM1 concentrations and air masses from the Balkans, Turkey and Eastern Europe the highest.

scholarly journals Aerosol optical depth measurements by airborne sun photometer in SOLVE II: Comparisons to SAGE III, POAM III and airborne spectrometer measurements

2005 ◽  
Vol 5 (5) ◽  
pp. 1311-1339 ◽  
Author(s):  
P. Russell ◽  
J. Livingston ◽  
B. Schmid ◽  
J. Eilers ◽  
R. Kolyer ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Stratospheric Aerosol ◽  
Line Of Sight ◽  
Aerosol Measurement ◽  
Validation Experiment ◽  
Satellite Sensors ◽  
Beam Transmission ◽  
Relative Differences ◽  
Polar Ozone

Abstract. The 14-channel NASA Ames Airborne Tracking Sunphotometer (AATS-14) measured solar- beam transmission on the NASA DC-8 during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II). This paper presents AATS-14 results for multiwavelength aerosol optical depth (AOD), including comparisons to results from two satellite sensors and another DC-8 instrument, namely the Stratospheric Aerosol and Gas Experiment III (SAGE III), the Polar Ozone and Aerosol Measurement III (POAM III) and the Direct-beam Irradiance Airborne Spectrometer (DIAS). AATS-14 provides aerosol results at 13 wavelengths λ spanning the range of SAGE III and POAM III aerosol wavelengths. Because most AATS measurements were made at solar zenith angles (SZA) near 90°, retrieved AODs are strongly affected by uncertainties in the relative optical airmass of the aerosols and other constituents along the line of sight (LOS) between instrument and sun. To reduce dependence of the AATS-satellite comparisons on airmass, we perform the comparisons in LOS transmission and LOS optical thickness (OT) as well as in vertical OT (i.e., optical depth, OD). We also use a new airmass algorithm that validates the algorithm we previously used to within 2% for SZA<90°, and in addition provides results for SZA≥90°. For 6 DC-8 flights, 19 January-2 February 2003, AATS and DIAS results for LOS aerosol OT at λ=400nm agree to ≤12% of the AATS value. Mean and root-mean-square (RMS) differences, (DIAS-AATS)/AATS, are -2.3% and 7.7%, respectively. For DC-8 altitudes, AATS-satellite comparisons are possible only for λ>440nm, because of signal depletion for shorter λ on the satellite full-limb LOS. For the 4 AATS-SAGE and 4 AATS-POAM near-coincidences conducted 19-31 January 2003, AATS-satellite AOD differences were ≤0.0041 for all λ>440nm. RMS differences were ≤0.0022 for SAGE-AATS and ≤0.0026 for POAM-AATS. RMS relative differences in AOD ([SAGE-AATS]/AATS) were ≤33% for λ<~755nm, but grew to 59% for 1020nm and 66% at 1545nm. For λ>~755nm, AATS-POAM differences were less than AATS-SAGE differences, and RMS relative differences in AOD ([AATS-POAM]/AATS) were ≤31% for all λ between 440 and 1020nm. Unexplained differences that remain are associated with transmission differences, rather than differences in gas subtraction or conversion from LOS to vertical quantities. The very small stratospheric AOD values that occurred during SOLVE II added to the challenge of the comparisons, but do not explain all the differences.

scholarly journals Measurement of the ambient organic aerosol volatility distribution: application during the Finokalia Aerosol Measurement Experiment (FAME-2008)

2010 ◽  
Vol 10 (7) ◽  
pp. 17435-17466 ◽  
Author(s):  
B. H. Lee ◽  
E. Kostenidou ◽  
L. Hildebrandt ◽  
I. Riipinen ◽  
G. J. Engelhart ◽  
...  
Keyword(s):  
Particle Density ◽  
Collection Efficiency ◽  
Eastern Mediterranean ◽  
Organic Aerosol ◽  
Accommodation Coefficient ◽  
Scanning Mobility Particle Sizer ◽  
Aerosol Dynamics ◽  
Aerosol Measurement ◽  
Measurement Experiment ◽  
Particle Sizer

Abstract. A variable residence time thermodenuder (TD) was combined with an Aerodyne Aerosol Mass Spectrometer (AMS) and a Scanning Mobility Particle Sizer (SMPS) to measure the volatility distribution of aged organic aerosol in the Eastern Mediterranean during the Finokalia Aerosol Measurement Experiment in May of 2008 (FAME-2008). A new method for the quantification of the organic aerosol volatility distribution was developed combining measurements of all three instruments together with an aerosol dynamics model. Challenges in the interpretation of ambient thermodenuder-AMS measurements include the potential resistances to mass transfer during particle evaporation, the effects of particle size on the evaporated mass fraction, the changes in the AMS collection efficiency and particle density as the particles evaporate partially in the TD, and finally potential losses inside the TD. Our proposed measurement and data analysis method accounts for all of these problems combining the AMS and SMPS measurements. The AMS collection efficiency of the aerosol that passed through the TD was found to be approximately 10% lower than the collection efficiency of the aerosol that passed through the bypass. The organic aerosol measured at Finokalia is approximately 2 orders of magnitude less volatile than fresh laboratory-generated biogenic secondary organic aerosol. This low volatility is consistent with its highly oxygenated AMS mass spectrum. The results are found to be highly sensitive to the mass accommodation coefficient of the evaporating species.

The Polar Ozone and Aerosol Measurement instrument

1996 ◽  
Vol 101 (D9) ◽  
pp. 14479-14487 ◽  
Author(s):  
W. Glaccum ◽  
R. L. Lucke ◽  
R. M. Bevilacqua ◽  
E. P. Shettle ◽  
J. S. Hornstein ◽  
...  
Keyword(s):  
Measurement Instrument ◽  
Aerosol Measurement ◽  
Polar Ozone

scholarly journals An analysis of Polar Ozone and Aerosol Measurement (POAM) II Arctic polar stratospheric cloud observations, 1993-1996

1999 ◽  
Vol 104 (D20) ◽  
pp. 24341-24357 ◽  
Author(s):  
Michael D. Fromm ◽  
Richard M. Bevilacqua ◽  
John Hornstein ◽  
Eric Shettle ◽  
Karl Hoppel ◽  
...  
Keyword(s):  
Aerosol Measurement ◽  
Polar Stratospheric Cloud ◽  
Polar Ozone

scholarly journals Measurement of the ambient organic aerosol volatility distribution: application during the Finokalia Aerosol Measurement Experiment (FAME-2008)

2010 ◽  
Vol 10 (24) ◽  
pp. 12149-12160 ◽  
Author(s):  
B. H. Lee ◽  
E. Kostenidou ◽  
L. Hildebrandt ◽  
I. Riipinen ◽  
G. J. Engelhart ◽  
...  
Keyword(s):  
Particle Density ◽  
Collection Efficiency ◽  
Eastern Mediterranean ◽  
Organic Aerosol ◽  
Accommodation Coefficient ◽  
Scanning Mobility Particle Sizer ◽  
Aerosol Dynamics ◽  
Aerosol Measurement ◽  
Measurement Experiment ◽  
Particle Sizer

Abstract. A variable residence time thermodenuder (TD) was combined with an Aerodyne Aerosol Mass Spectrometer (AMS) and a Scanning Mobility Particle Sizer (SMPS) to measure the volatility distribution of aged organic aerosol in the Eastern Mediterranean during the Finokalia Aerosol Measurement Experiment in May of 2008 (FAME-2008). A new method for the quantification of the organic aerosol volatility distribution was developed combining measurements of all three instruments together with an aerosol dynamics model. Challenges in the interpretation of ambient thermodenuder-AMS measurements include the potential resistances to mass transfer during particle evaporation, the effects of particle size on the evaporated mass fraction, the changes in the AMS collection efficiency and particle density as the particles evaporate partially in the TD, and finally potential losses inside the TD. Our proposed measurement and data analysis method accounts for all of these problems combining the AMS and SMPS measurements. The AMS collection efficiency of the aerosol that passed through the TD was found to be approximately 10% lower than the collection efficiency of the aerosol that passed through the bypass. The organic aerosol measured at Finokalia is approximately 2 or more orders of magnitude less volatile than fresh laboratory-generated monoterpene (α-pinene, β-pinene and limonene under low NOx conditions) secondary organic aerosol. This low volatility is consistent with its highly oxygenated AMS mass spectrum. The results are found to be highly sensitive to the mass accommodation coefficient of the evaporating species. This analysis is based on the assumption that there were no significant reactions taking place inside the thermodenuder.

scholarly journals Comparison of Polar Ozone and Aerosol Measurement (POAM) II and Stratospheric Aerosol and Gas Experiment (SAGE) II aerosol measurements from 1994 to 1996

2000 ◽  
Vol 105 (D3) ◽  
pp. 3929-3942 ◽  
Author(s):  
C. E. Randall ◽  
R. M. Bevilacqua ◽  
J. D. Lumpe ◽  
K. W. Hoppel ◽  
D. W. Rusch ◽  
...  
Keyword(s):  
Stratospheric Aerosol ◽  
Aerosol Measurement ◽  
Polar Ozone
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