Publication Abstracts

Redemann et al. 2021

Redemann, J., R. Wood, P. Zuidema, S.J. Doherty, B. Luna, S.E. LeBlanc, M.S. Diamond, Y. Shinozuka, I.Y. Chang, R. Ueyama, L. Pfister, J. Ryoo, A.N. Dobracki, A.M. da Silva, K.M. Longo, M.S. Kacenelenbogen, C.J. Flynn, K. Pistone, N.M. Knox, S.J. Piketh, J.M. Haywood, P. Formenti, M. Mallet, P. Stier, A.S. Ackerman, S.E. Bauer, A.M. Fridlind, G.R. Carmichael, P.E. Saide, G.A. Ferrada, S.G. Howell, S. Freitag, B. Cairns, B.N. Holben, K.D. Knobelspiesse, S. Tanelli, T.S. L'Ecuyer, A.M. Dzambo, O.O. Sy, G.M. McFarquhar, M.R. Poellot, S. Gupta, J.R. O'Brien, A. Nenes, M.E. Kacarab, J.P.S. Wong, J.D. Small-Griswold, K.L. Thornhill, D. Noone, J.R. Podolske, K.S. Schmidt, P. Pilewskie, H. Chen, S.P. Cochrane, A.J. Sedlacek, T.J. Lang, E. Stith, M. Segal-Rozenhaimer, R.A. Ferrare, S.P. Burton, C.A. Hostetler, D.J. Diner, S.E. Platnick, J.S. Myers, K.G. Meyer, D.A. Spangenberg, H. Maring, and L. Gao, 2021: An overview of the ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) project: Aerosol-cloud-radiation interactions in the Southeast Atlantic basin. Atmos. Chem. Phys., 21, no. 3, 1507-1563, doi:10.5194/acp-21-1507-2021.

Southern Africa produces almost a third of the Earth's biomass burning (BB) aerosol particles, yet the fate of these particles and their influence on regional and global climate is poorly understood. ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) is a 5-year NASA EVS-2 (Earth Venture Suborbital-2) investigation with three intensive observation periods designed to study key atmospheric processes that determine the climate impacts of these aerosols. During the Southern Hemisphere winter and spring (June-October), aerosol particles reaching 3-5 km in altitude are transported westward over the southeast Atlantic, where they interact with one of the largest subtropical stratocumulus (Sc) cloud decks in the world. The representation of these interactions in climate models remains highly uncertain in part due to a scarcity of observational constraints on aerosol and cloud properties, as well as due to the parameterized treatment of physical processes. Three ORACLES deployments by the NASA P-3 aircraft in September 2016, August 2017, and October 2018 (totaling ∼350 science flight hours), augmented by the deployment of the NASA ER-2 aircraft for remote sensing in September 2016 (totaling ∼100 science flight hours), were intended to help fill this observational gap. ORACLES focuses on three fundamental science themes centered on the climate effects of African BB aerosols: (a) direct aerosol radiative effects, (b) effects of aerosol absorption on atmospheric circulation and clouds, and (c) aerosol-cloud microphysical interactions. This paper summarizes the ORACLES science objectives, describes the project implementation, provides an overview of the flights and measurements in each deployment, and highlights the integrative modeling efforts from cloud to global scales to address science objectives. Significant new findings on the vertical structure of BB aerosol physical and chemical properties, chemical aging, cloud condensation nuclei, rain and precipitation statistics, and aerosol indirect effects are emphasized, but their detailed descriptions are the subject of separate publications. The main purpose of this paper is to familiarize the broader scientific community with the ORACLES project and the dataset it produced.

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BibTeX Citation

  author={Redemann, J. and Wood, R. and Zuidema, P. and Doherty, S. J. and Luna, B. and LeBlanc, S. E. and Diamond, M. S. and Shinozuka, Y. and Chang, I. Y. and Ueyama, R. and Pfister, L. and Ryoo, J. and Dobracki, A. N. and da Silva, A. M. and Longo, K. M. and Kacenelenbogen, M. S. and Flynn, C. J. and Pistone, K. and Knox, N. M. and Piketh, S. J. and Haywood, J. M. and Formenti, P. and Mallet, M. and Stier, P. and Ackerman, A. S. and Bauer, S. E. and Fridlind, A. M. and Carmichael, G. R. and Saide, P. E. and Ferrada, G. A. and Howell, S. G. and Freitag, S. and Cairns, B. and Holben, B. N. and Knobelspiesse, K. D. and Tanelli, S. and L'Ecuyer, T. S. and Dzambo, A. M. and Sy, O. O. and McFarquhar, G. M. and Poellot, M. R. and Gupta, S. and O'Brien, J. R. and Nenes, A. and Kacarab, M. E. and Wong, J. P. S. and Small-Griswold, J. D. and Thornhill, K. L. and Noone, D. and Podolske, J. R. and Schmidt, K. S. and Pilewskie, P. and Chen, H. and Cochrane, S. P. and Sedlacek, A. J. and Lang, T. J. and Stith, E. and Segal-Rozenhaimer, M. and Ferrare, R. A. and Burton, S. P. and Hostetler, C. A. and Diner, D. J. and Platnick, S. E. and Myers, J. S. and Meyer, K. G. and Spangenberg, D. A. and Maring, H. and Gao, L.},
  title={An overview of the ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) project: Aerosol-cloud-radiation interactions in the Southeast Atlantic basin},
  journal={Atmos. Chem. Phys.},

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RIS Citation

ID  - re02100m
AU  - Redemann, J.
AU  - Wood, R.
AU  - Zuidema, P.
AU  - Doherty, S. J.
AU  - Luna, B.
AU  - LeBlanc, S. E.
AU  - Diamond, M. S.
AU  - Shinozuka, Y.
AU  - Chang, I. Y.
AU  - Ueyama, R.
AU  - Pfister, L.
AU  - Ryoo, J.
AU  - Dobracki, A. N.
AU  - da Silva, A. M.
AU  - Longo, K. M.
AU  - Kacenelenbogen, M. S.
AU  - Flynn, C. J.
AU  - Pistone, K.
AU  - Knox, N. M.
AU  - Piketh, S. J.
AU  - Haywood, J. M.
AU  - Formenti, P.
AU  - Mallet, M.
AU  - Stier, P.
AU  - Ackerman, A. S.
AU  - Bauer, S. E.
AU  - Fridlind, A. M.
AU  - Carmichael, G. R.
AU  - Saide, P. E.
AU  - Ferrada, G. A.
AU  - Howell, S. G.
AU  - Freitag, S.
AU  - Cairns, B.
AU  - Holben, B. N.
AU  - Knobelspiesse, K. D.
AU  - Tanelli, S.
AU  - L'Ecuyer, T. S.
AU  - Dzambo, A. M.
AU  - Sy, O. O.
AU  - McFarquhar, G. M.
AU  - Poellot, M. R.
AU  - Gupta, S.
AU  - O'Brien, J. R.
AU  - Nenes, A.
AU  - Kacarab, M. E.
AU  - Wong, J. P. S.
AU  - Small-Griswold, J. D.
AU  - Thornhill, K. L.
AU  - Noone, D.
AU  - Podolske, J. R.
AU  - Schmidt, K. S.
AU  - Pilewskie, P.
AU  - Chen, H.
AU  - Cochrane, S. P.
AU  - Sedlacek, A. J.
AU  - Lang, T. J.
AU  - Stith, E.
AU  - Segal-Rozenhaimer, M.
AU  - Ferrare, R. A.
AU  - Burton, S. P.
AU  - Hostetler, C. A.
AU  - Diner, D. J.
AU  - Platnick, S. E.
AU  - Myers, J. S.
AU  - Meyer, K. G.
AU  - Spangenberg, D. A.
AU  - Maring, H.
AU  - Gao, L.
PY  - 2021
TI  - An overview of the ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) project: Aerosol-cloud-radiation interactions in the Southeast Atlantic basin
JA  - Atmos. Chem. Phys.
VL  - 21
IS  - 3
SP  - 1507
EP  - 1563
DO  - 10.5194/acp-21-1507-2021
ER  -

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