Details

Autor(en) / Beteiligte

• Pöhlker, Mira L
• Ditas, Florian
• Saturno, Jorge
• Klimach, Thomas
• Hrabě de Angelis, Isabella
• Araùjo, Alessandro C
• Brito, Joel
• Carbone, Samara
• Cheng, Yafang
• Chi, Xuguang
• Ditz, Reiner
• Gunthe, Sachin S
• Holanda, Bruna A
• Kandler, Konrad
• Kesselmeier, Jürgen
• Könemann, Tobias
• Krüger, Ovid O
• Lavrič, JoÅ¡t V
• Martin, Scot T
• Mikhailov, Eugene
• Moran-Zuloaga, Daniel
• Rizzo, Luciana V
• Rose, Diana
• Su, Hang
• Thalman, Ryan
• Walter, David
• Wang, Jian
• Wolff, Stefan
• Barbosa, Henrique M. J
• Artaxo, Paulo
• Andreae, Meinrat O
• Pöschl, Ulrich
• Pöhlker, Christopher

Titel

Long-term observations of cloud condensation nuclei over the Amazon rain forest – Part 2: Variability and characteristics of biomass burning, long-range transport, and pristine rain forest aerosols

Ist Teil von

• Atmospheric chemistry and physics, 2018-07, Vol.18 (14), p.10289-10331

Ort / Verlag

Katlenburg-Lindau: Copernicus GmbH

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Size-resolved measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations and hygroscopicity were conducted over a full seasonal cycle at the remote Amazon Tall Tower Observatory (ATTO, March 2014--February 2015). In a preceding companion paper, we presented annually and seasonally averaged data and parametrizations (Part 1; Pöhlker et al., 2016a). In the present study (Part 2), we analyze key features and implications of aerosol and CCN properties for the following characteristic atmospheric conditions: Long-range-transport (LRT) events, which frequently bring Saharan dust, African biomass smoke, and sea spray aerosols into the Amazon Basin, mostly during February to April. The LRT episodes are characterized by a dominant accumulation mode (D.sub.Ait   ≈  80 nm, N.sub.Ait   ≈  120 cm.sup.-3 vs. D.sub.acc   ≈  180 nm, N.sub.acc   ≈  310 cm.sup.-3 ), an increased abundance of dust and salt, and relatively high hygroscopicity (κ.sub.Ait ≈  0.18, κ.sub.acc   ≈  0.35). The coarse mode is also significantly enhanced during these events.