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| Titel |
Assessing Single Particle Soot Photometer and Integrating Sphere/Integrating Sandwich Spectrophotometer measurement techniques for quantifying black carbon concentration in snow |
| VerfasserIn |
J. P. Schwarz, S. J. Doherty, F. Li, S. T. Ruggiero, C. E. Tanner, A. E. Perring, R. S. Gao, D. W. Fahey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 11 ; Nr. 5, no. 11 (2012-11-01), S.2581-2592 |
| Datensatznummer |
250003159
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| Publikation (Nr.) |
 copernicus.org/amt-5-2581-2012.pdf |
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| Zusammenfassung |
| We evaluate the performance of the Single Particle Soot Photometer (SP2) and the Integrating
Sphere/Integrating Sandwich Spectrophotometer (ISSW) in quantifying the concentration of
refractory black carbon (BC) in snow samples. We find that the SP2 can be used to measure BC mass
concentration in snow with substantially larger uncertainty (60%) than for atmospheric
sampling (<30%). Achieving this level of accuracy requires careful assessment of nebulizer
performance and SP2 calibration with consideration of the fact that BC in snow can exist in larger
sizes than typically observed in the atmosphere. Once these issues are addressed, the SP2 is able
to measure the size distribution and mass concentration of BC in the snow. Laboratory comparison
of the SP2 and the ISSW revealed
significant biases in the estimate of BC concentration from the ISSW when test samples contained
dust or non-absorbing particulates. These results suggest that current estimates of BC mass
concentration in snow or ice formed from fallen snow using either the SP2 or the ISSW may be associated with significant
underestimates of uncertainty. |
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