Black and brown carbon over central Amazonia: long-term aerosol measurements at the ATTO site by J. Saturno, J. Saturno, B. A. Holanda, C. Pöhlker, F. Ditas, Q. Wang, Q. Wang, D. Moran-Zuloaga, J. Brito, J. Brito, S. Carbone, S. Carbone, Y. Cheng, X. Chi, J. Ditas, J. Ditas, T. Hoffmann, I. Hrabe de Angelis, T. Könemann, J. V. Lavrič, N. Ma, N. Ma, J. Ming, H. Paulsen, M. L. Pöhlker, L. V. Rizzo, P. Schlag, H. Su, D. Walter, S. Wolff, Y. Zhang, P. Artaxo, U. Pöschl, M. O. Andreae, M. O. Andreae

“…</p></div></li><li class="item"><div class="para"><p>&ndash; The retrieved BC mass absorption cross sections, <i>α</i>_abs, are substantially higher than values widely used in the literature (i.e., 6.6&thinsp;m²&thinsp;g⁻¹ at 637&thinsp;nm wavelength), likely related to thick organic or inorganic coatings on the BC cores. …”
Get full text

Photolysis and oxidation by OH radicals of two carbonyl nitrates: 4-nitrooxy-2-butanone and 5-nitrooxy-2-pentanone by B. Picquet-Varrault, R. Suarez-Bertoa, M. Duncianu, M. Cazaunau, E. Pangui, M. David, J.-F. Doussin

“…They also suggest that, similarly to <span class="inline-formula"><i>α</i></span>-nitrooxy ketones, <span class="inline-formula"><i>β</i></span>-nitrooxy ketones have enhanced UV absorption cross sections and quantum yields equal to or close to unity and that <span class="inline-formula"><i>γ</i></span>-nitrooxy ketones have a lower enhancement of cross sections, which can easily be explained by the larger distance between the two chromophore groups. …”
Get full text