Measurement and modeling of the multiwavelength optical properties of uncoated flame-generated soot

Forestieri, Sara D.; Helgestad, Taylor M.; Lambe, Andrew T.; Renbaum-Wolff, Lindsay; Lack, Daniel A.; Massoli, Paola; Cross, Eben S.; Dubey, Manvendra K.; Mazzoleni, Claudio; Olfert, Jason S.; Sedlacek III, Arthur J.; Freedman, Andrew; Davidovits, Paul; Onasch, Timothy B.; Cappa, Christopher D.

doi:10.5194/acp-18-12141-2018

Articles | Volume 18, issue 16

https://doi.org/10.5194/acp-18-12141-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-18-12141-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 16

Research article

|

22 Aug 2018

Research article |

| 22 Aug 2018

Measurement and modeling of the multiwavelength optical properties of uncoated flame-generated soot

Sara D. Forestieri, Taylor M. Helgestad, Andrew T. Lambe, Lindsay Renbaum-Wolff, Daniel A. Lack, Paola Massoli, Eben S. Cross, Manvendra K. Dubey, Claudio Mazzoleni, Jason S. Olfert, Arthur J. Sedlacek III, Andrew Freedman, Paul Davidovits, Timothy B. Onasch, and Christopher D. Cappa

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Dec 2024	27	5	1	33
Jan 2025	27	9	0	36
Feb 2025	18	10	0	28
Mar 2025	29	10	0	39
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Cumulative views and downloads (calculated since 11 Apr 2018)

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Apr 2018	175	72	7	254
May 2018	54	26	2	82
Jun 2018	25	17	1	43
Jul 2018	18	15	0	33
Aug 2018	194	80	5	279
Sep 2018	95	69	4	168
Oct 2018	41	35	3	79
Nov 2018	38	28	0	66
Dec 2018	15	12	1	28
Jan 2019	11	14	1	26
Feb 2019	13	12	2	27
Mar 2019	11	13	1	25
Apr 2019	11	11	0	22
May 2019	21	21	0	42
Jun 2019	30	20	0	50
Jul 2019	17	8	0	25
Aug 2019	13	23	0	36
Sep 2019	12	11	0	23
Oct 2019	36	24	0	60
Nov 2019	20	18	1	39
Dec 2019	17	6	0	23
Jan 2020	22	9	0	31
Feb 2020	20	12	1	33
Mar 2020	9	9	2	20
Apr 2020	14	11	0	25
May 2020	20	7	1	28
Jun 2020	16	7	0	23
Jul 2020	19	20	4	43
Aug 2020	13	12	2	27
Sep 2020	17	7	2	26
Oct 2020	13	11	0	24
Nov 2020	19	17	0	36
Dec 2020	8	12	0	20
Jan 2021	20	19	0	39
Feb 2021	7	5	0	12
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Apr 2021	17	11	1	29
May 2021	12	12	2	26
Jun 2021	12	3	0	15
Jul 2021	17	9	1	27
Aug 2021	12	10	0	22
Sep 2021	21	14	0	35
Oct 2021	8	43	1	52
Nov 2021	18	34	1	53
Dec 2021	14	21	0	35
Jan 2022	11	11	2	24
Feb 2022	15	9	4	28
Mar 2022	20	8	0	28
Apr 2022	14	4	1	19
May 2022	9	7	0	16
Jun 2022	9	4	2	15
Jul 2022	17	7	0	24
Aug 2022	113	8	1	122
Sep 2022	21	7	1	29
Oct 2022	18	11	1	30
Nov 2022	37	13	1	51
Dec 2022	21	12	0	33
Jan 2023	30	15	1	46
Feb 2023	39	12	0	51
Mar 2023	31	14	0	45
Apr 2023	14	8	0	22
May 2023	8	11	0	19
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Nov 2023	14	4	1	19
Dec 2023	14	10	2	26
Jan 2024	11	5	0	16
Feb 2024	10	17	0	27
Mar 2024	25	14	2	41
Apr 2024	17	22	4	43
May 2024	16	15	2	33
Jun 2024	53	7	1	61
Jul 2024	34	5	2	41
Aug 2024	34	8	1	43
Sep 2024	34	17	0	51
Oct 2024	22	19	3	44
Nov 2024	32	7	3	42
Dec 2024	27	5	1	33
Jan 2025	27	9	0	36
Feb 2025	18	10	0	28
Mar 2025	29	10	0	39
Apr 2025	24	20	2	46
May 2025	35	15	1	51
Jun 2025	80	13	4	97
Jul 2025	61	22	5	88
Aug 2025	27	20	1	48
Sep 2025	63	21	3	87
Oct 2025	37	19	0	56
Nov 2025	41	24	3	68

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Short summary

We characterized optical properties of flame-derived black carbon particles and interpret our observations through the use of Mie theory and Rayleigh–Debye–Gans theory. We determined that the mass absorption coefficient is independent of particle collapse and use this to derive theory- and wavelength-specific refractive indices for black carbon (BC). We demonstrate the inadequacy of Mie theory and suggest an alternative approach for atmospheric models to better represent light absorption by BC.


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