Primary marine aerosol-cloud interactions off the coast of California

R. L. Modini, A. A. Frossard, L. Ahlm, L. M. Russell, C. E. Corrigan, G. C. Roberts, L. N. Hawkins, J. C. Schroder, A. K. Bertram, R. Zhao, A. K Y Lee, J. P D Abbatt, J. Lin, A. Nenes, Z. Wang, A. Wonaschütz, Armin Sorooshian, K. J. Noone, H. Jonsson, J. H. SeinfeldD. Toom-Sauntry, A. M. Macdonald, W. R. Leaitch

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Primary marine aerosol (PMA)-cloud interactions off the coast of California were investigated using observations of marine aerosol, cloud condensation nuclei (CCN), and stratocumulus clouds during the Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE) and the Stratocumulus Observations of Los-Angeles Emissions Derived Aerosol-Droplets (SOLEDAD) studies. Based on recently reported measurements of PMA size distributions, a constrained lognormal-mode-fitting procedure was devised to isolate PMA number size distributions from total aerosol size distributions and applied to E-PEACE measurements. During the 12 day E-PEACE cruise on the R/V Point Sur, PMA typically contributed less than 15% of total particle concentrations. PMA number concentrations averaged 12 cm<sup>-3</sup> during a relatively calmer period (average wind speed 12 m/s<sup>1</sup>) lasting 8 days, and 71 cm<sup>-3</sup> during a period of higher wind speeds (average 16 m/s<sup>1</sup>) lasting 5 days. On average, PMA contributed less than 10% of total CCN at supersaturations up to 0.9% during the calmer period; however, during the higher wind speed period, PMA comprised 5-63% of CCN (average 16-28%) at supersaturations less than 0.3%. Sea salt was measured directly in the dried residuals of cloud droplets during the SOLEDAD study. The mass fractions of sea salt in the residuals averaged 12 to 24% during three cloud events. Comparing the marine stratocumulus clouds sampled in the two campaigns, measured peak supersaturations were 0.2 ± 0.04% during E-PEACE and 0.05-0.1% during SOLEDAD. The available measurements show that cloud droplet number concentrations increased with 100 nm particles in E-PEACE but decreased in the three SOLEDAD cloud events. Key Points New method of analyzing primary marine aerosol (PMA) number size distributions PMA 15% of aerosol number concentrations, 58% of CCN in E-PEACE CDNC increased with increasing 100 nm particles in E-PEACE but not SOLEDAD

Original languageEnglish (US)
Pages (from-to)4282-4303
Number of pages22
JournalJournal of Geophysical Research: Space Physics
Volume120
Issue number9
DOIs
StatePublished - May 16 2015

Fingerprint

volcanic cloud
Aerosols
coasts
Coastal zones
aerosols
aerosol
stratocumulus
coast
cloud condensation nucleus
interactions
droplet
cloud droplet
supersaturation
condensation nuclei
experiment
wind velocity
sea salt
Condensation
Supersaturation
stratocumulus clouds

Keywords

  • aerosol-cloud interactions
  • cloud condensation nuclei
  • marine aerosol
  • sea spray aerosol
  • stratocumulus clouds
  • supersaturations

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Modini, R. L., Frossard, A. A., Ahlm, L., Russell, L. M., Corrigan, C. E., Roberts, G. C., ... Leaitch, W. R. (2015). Primary marine aerosol-cloud interactions off the coast of California. Journal of Geophysical Research: Space Physics, 120(9), 4282-4303. https://doi.org/10.1002/2014JD022963

Primary marine aerosol-cloud interactions off the coast of California. / Modini, R. L.; Frossard, A. A.; Ahlm, L.; Russell, L. M.; Corrigan, C. E.; Roberts, G. C.; Hawkins, L. N.; Schroder, J. C.; Bertram, A. K.; Zhao, R.; Lee, A. K Y; Abbatt, J. P D; Lin, J.; Nenes, A.; Wang, Z.; Wonaschütz, A.; Sorooshian, Armin; Noone, K. J.; Jonsson, H.; Seinfeld, J. H.; Toom-Sauntry, D.; Macdonald, A. M.; Leaitch, W. R.

In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 9, 16.05.2015, p. 4282-4303.

Research output: Contribution to journalArticle

Modini, RL, Frossard, AA, Ahlm, L, Russell, LM, Corrigan, CE, Roberts, GC, Hawkins, LN, Schroder, JC, Bertram, AK, Zhao, R, Lee, AKY, Abbatt, JPD, Lin, J, Nenes, A, Wang, Z, Wonaschütz, A, Sorooshian, A, Noone, KJ, Jonsson, H, Seinfeld, JH, Toom-Sauntry, D, Macdonald, AM & Leaitch, WR 2015, 'Primary marine aerosol-cloud interactions off the coast of California', Journal of Geophysical Research: Space Physics, vol. 120, no. 9, pp. 4282-4303. https://doi.org/10.1002/2014JD022963
Modini RL, Frossard AA, Ahlm L, Russell LM, Corrigan CE, Roberts GC et al. Primary marine aerosol-cloud interactions off the coast of California. Journal of Geophysical Research: Space Physics. 2015 May 16;120(9):4282-4303. https://doi.org/10.1002/2014JD022963
Modini, R. L. ; Frossard, A. A. ; Ahlm, L. ; Russell, L. M. ; Corrigan, C. E. ; Roberts, G. C. ; Hawkins, L. N. ; Schroder, J. C. ; Bertram, A. K. ; Zhao, R. ; Lee, A. K Y ; Abbatt, J. P D ; Lin, J. ; Nenes, A. ; Wang, Z. ; Wonaschütz, A. ; Sorooshian, Armin ; Noone, K. J. ; Jonsson, H. ; Seinfeld, J. H. ; Toom-Sauntry, D. ; Macdonald, A. M. ; Leaitch, W. R. / Primary marine aerosol-cloud interactions off the coast of California. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 9. pp. 4282-4303.
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abstract = "Primary marine aerosol (PMA)-cloud interactions off the coast of California were investigated using observations of marine aerosol, cloud condensation nuclei (CCN), and stratocumulus clouds during the Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE) and the Stratocumulus Observations of Los-Angeles Emissions Derived Aerosol-Droplets (SOLEDAD) studies. Based on recently reported measurements of PMA size distributions, a constrained lognormal-mode-fitting procedure was devised to isolate PMA number size distributions from total aerosol size distributions and applied to E-PEACE measurements. During the 12 day E-PEACE cruise on the R/V Point Sur, PMA typically contributed less than 15{\%} of total particle concentrations. PMA number concentrations averaged 12 cm-3 during a relatively calmer period (average wind speed 12 m/s1) lasting 8 days, and 71 cm-3 during a period of higher wind speeds (average 16 m/s1) lasting 5 days. On average, PMA contributed less than 10{\%} of total CCN at supersaturations up to 0.9{\%} during the calmer period; however, during the higher wind speed period, PMA comprised 5-63{\%} of CCN (average 16-28{\%}) at supersaturations less than 0.3{\%}. Sea salt was measured directly in the dried residuals of cloud droplets during the SOLEDAD study. The mass fractions of sea salt in the residuals averaged 12 to 24{\%} during three cloud events. Comparing the marine stratocumulus clouds sampled in the two campaigns, measured peak supersaturations were 0.2 ± 0.04{\%} during E-PEACE and 0.05-0.1{\%} during SOLEDAD. The available measurements show that cloud droplet number concentrations increased with 100 nm particles in E-PEACE but decreased in the three SOLEDAD cloud events. Key Points New method of analyzing primary marine aerosol (PMA) number size distributions PMA 15{\%} of aerosol number concentrations, 58{\%} of CCN in E-PEACE CDNC increased with increasing 100 nm particles in E-PEACE but not SOLEDAD",
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AU - Modini, R. L.

AU - Frossard, A. A.

AU - Ahlm, L.

AU - Russell, L. M.

AU - Corrigan, C. E.

AU - Roberts, G. C.

AU - Hawkins, L. N.

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AU - Lin, J.

AU - Nenes, A.

AU - Wang, Z.

AU - Wonaschütz, A.

AU - Sorooshian, Armin

AU - Noone, K. J.

AU - Jonsson, H.

AU - Seinfeld, J. H.

AU - Toom-Sauntry, D.

AU - Macdonald, A. M.

AU - Leaitch, W. R.

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N2 - Primary marine aerosol (PMA)-cloud interactions off the coast of California were investigated using observations of marine aerosol, cloud condensation nuclei (CCN), and stratocumulus clouds during the Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE) and the Stratocumulus Observations of Los-Angeles Emissions Derived Aerosol-Droplets (SOLEDAD) studies. Based on recently reported measurements of PMA size distributions, a constrained lognormal-mode-fitting procedure was devised to isolate PMA number size distributions from total aerosol size distributions and applied to E-PEACE measurements. During the 12 day E-PEACE cruise on the R/V Point Sur, PMA typically contributed less than 15% of total particle concentrations. PMA number concentrations averaged 12 cm-3 during a relatively calmer period (average wind speed 12 m/s1) lasting 8 days, and 71 cm-3 during a period of higher wind speeds (average 16 m/s1) lasting 5 days. On average, PMA contributed less than 10% of total CCN at supersaturations up to 0.9% during the calmer period; however, during the higher wind speed period, PMA comprised 5-63% of CCN (average 16-28%) at supersaturations less than 0.3%. Sea salt was measured directly in the dried residuals of cloud droplets during the SOLEDAD study. The mass fractions of sea salt in the residuals averaged 12 to 24% during three cloud events. Comparing the marine stratocumulus clouds sampled in the two campaigns, measured peak supersaturations were 0.2 ± 0.04% during E-PEACE and 0.05-0.1% during SOLEDAD. The available measurements show that cloud droplet number concentrations increased with 100 nm particles in E-PEACE but decreased in the three SOLEDAD cloud events. Key Points New method of analyzing primary marine aerosol (PMA) number size distributions PMA 15% of aerosol number concentrations, 58% of CCN in E-PEACE CDNC increased with increasing 100 nm particles in E-PEACE but not SOLEDAD

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