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Title: Ground-based observation of clusters and nucleation-mode particles in the Amazon

Abstract

We investigated atmospheric new particle formation (NPF) in the Amazon rainforest using direct measurement methods. To our knowledge this is the first direct observation of NPF events in the Amazon region. However, previous observations elsewhere in Brazil showed the occurrence of nucleation-mode particles. Here, our measurements covered two field sites and both the wet and dry season. We measured the variability of air ion concentrations (0.8–12nm) with an ion spectrometer between September 2011 and January 2014 at a rainforest site (T0t). Between February and October 2014, the same measurements were performed at a grassland pasture site (T3) as part of the GoAmazon 2014/5 experiment, with two intensive operating periods (IOP1 and IOP2 during the wet and the dry season, respectively). The GoAmazon 2014/5 experiment was designed to study the influence of anthropogenic emissions on the changing climate in the Amazon region. The experiment included basic aerosol and trace gas measurements at the ground, remote sensing instrumentation, and two aircraft-based measurements.The results presented in this work are from measurements performed at ground level at both sites. The site inside the rainforest (T0t) is located 60km NNW of Manaus and influenced by pollution about once per week. The pasture (T3) site ismore » located 70km downwind from Manaus and influenced by the Manaus pollution plume typically once per day or every second day, especially in the afternoon. No NPF events were observed inside the rainforest (site T0t) at ground level during the measurement period. However, rain-induced ion and particle bursts (hereafter, rain events) occurred frequently (643 of 1031 days) at both sites during the wet and dry season, being most frequent during the wet season. During the rain events, the ion concentrations in three size ranges (0.8–2, 2–4, and 4–12nm) increased up to about 104–105cm-3. This effect was most pronounced in the intermediate and large size ranges, for which the background ion concentrations were about 10–15cm-3 compared with 700 cm-3 for the cluster ion background. We observed eight NPF events at the pasture site during the wet season. We calculated the growth rates and formation rates of neutral particles and ions for the size ranges 2–3 and 3–7 nm using the ion spectrometer data. The observed median growth rates were 0.8 and 1.6nmh-1 for 2–3nm sized ions and particles, respectively, with larger growth rates (13.3 and 7.9 nmh-1) in the 3–7 nm size range. The measured nucleation rates were of the order of 0.2 cm-3s-1 for particles and 4–9×10-3 cm-3 s-1 for ions. There was no clear difference in the sulfuric acid concentrations between the NPF event days and nonevent days (~9×105 cm-3). The two major differences between the NPF days and nonevent days were a factor of 1.8 lower condensation sink on NPF event days (1.8×10-3 s-1) compared to nonevents (3.2 × 10-3 s-1) and different air mass origins. In conclusion, to our knowledge, this is the first time that results from ground-based sub-3nm aerosol particle measurements have been obtained from the Amazon rainforest.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [1];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6];  [6]; ORCiD logo [7]; ORCiD logo [8];  [9];  [10]; ORCiD logo [9]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
+ Show Author Affiliations
  1. Univ. of Helsinki (Finland). Dept of Physics
  2. Univ. of Helsinki (Finland). Dept of Physics; European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  3. Univ. of Helsinki (Finland). Dept of Physics; National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Earth System Research Lab. (ESRL), Chemical Sciences Division; Univ. of Colorado, Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences
  4. Univ. of Helsinki (Finland). Dept of Physics; Univ. of Eastern Finland, Kuopio (Finland). Dept. of Applied Physics
  5. Finnish Meteorological Inst., Atmospheric composition research, Helsinki (Finland)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental & Climate Sciences Dept.
  7. Stockholm Univ. (Sweden). Dept. of Environmental Science and Analytical Chemistry (ACES)
  8. Univ. of Sao Paulo (Brazil). Inst. of Physics; Univ. of Clermont Auvergne, Clermont-Ferrand (France). Lab. for Meteorological Physics (LaMP)
  9. Univ. of Sao Paulo (Brazil). Inst. of Physics
  10. Harvard Univ., Cambridge, MA (United States). School of Engineering and Applied Sciences
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1475142
Report Number(s):
BNL-209104-2018-JAAM
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 17; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Wimmer, Daniela, Buenrostro Mazon, Stephany, Manninen, Hanna Elina, Kangasluoma, Juha, Franchin, Alessandro, Nieminen, Tuomo, Backman, John, Wang, Jian, Kuang, Chongai, Krejci, Radovan, Brito, Joel, Goncalves Morais, Fernando, Martin, Scot Turnbull, Artaxo, Paulo, Kulmala, Markku, Kerminen, Veli-Matti, and Petäjä, Tuukka. Ground-based observation of clusters and nucleation-mode particles in the Amazon. United States: N. p., 2017. Web. doi:10.5194/acp-18-13245-2018.
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Wimmer, Daniela, Buenrostro Mazon, Stephany, Manninen, Hanna Elina, Kangasluoma, Juha, Franchin, Alessandro, Nieminen, Tuomo, Backman, John, Wang, Jian, Kuang, Chongai, Krejci, Radovan, Brito, Joel, Goncalves Morais, Fernando, Martin, Scot Turnbull, Artaxo, Paulo, Kulmala, Markku, Kerminen, Veli-Matti, & Petäjä, Tuukka. Ground-based observation of clusters and nucleation-mode particles in the Amazon. United States. https://doi.org/10.5194/acp-18-13245-2018
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Wimmer, Daniela, Buenrostro Mazon, Stephany, Manninen, Hanna Elina, Kangasluoma, Juha, Franchin, Alessandro, Nieminen, Tuomo, Backman, John, Wang, Jian, Kuang, Chongai, Krejci, Radovan, Brito, Joel, Goncalves Morais, Fernando, Martin, Scot Turnbull, Artaxo, Paulo, Kulmala, Markku, Kerminen, Veli-Matti, and Petäjä, Tuukka. Thu . "Ground-based observation of clusters and nucleation-mode particles in the Amazon". United States. https://doi.org/10.5194/acp-18-13245-2018. https://www.osti.gov/servlets/purl/1475142.
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@article{osti_1475142,
title = {Ground-based observation of clusters and nucleation-mode particles in the Amazon},
author = {Wimmer, Daniela and Buenrostro Mazon, Stephany and Manninen, Hanna Elina and Kangasluoma, Juha and Franchin, Alessandro and Nieminen, Tuomo and Backman, John and Wang, Jian and Kuang, Chongai and Krejci, Radovan and Brito, Joel and Goncalves Morais, Fernando and Martin, Scot Turnbull and Artaxo, Paulo and Kulmala, Markku and Kerminen, Veli-Matti and Petäjä, Tuukka},
abstractNote = {We investigated atmospheric new particle formation (NPF) in the Amazon rainforest using direct measurement methods. To our knowledge this is the first direct observation of NPF events in the Amazon region. However, previous observations elsewhere in Brazil showed the occurrence of nucleation-mode particles. Here, our measurements covered two field sites and both the wet and dry season. We measured the variability of air ion concentrations (0.8–12nm) with an ion spectrometer between September 2011 and January 2014 at a rainforest site (T0t). Between February and October 2014, the same measurements were performed at a grassland pasture site (T3) as part of the GoAmazon 2014/5 experiment, with two intensive operating periods (IOP1 and IOP2 during the wet and the dry season, respectively). The GoAmazon 2014/5 experiment was designed to study the influence of anthropogenic emissions on the changing climate in the Amazon region. The experiment included basic aerosol and trace gas measurements at the ground, remote sensing instrumentation, and two aircraft-based measurements.The results presented in this work are from measurements performed at ground level at both sites. The site inside the rainforest (T0t) is located 60km NNW of Manaus and influenced by pollution about once per week. The pasture (T3) site is located 70km downwind from Manaus and influenced by the Manaus pollution plume typically once per day or every second day, especially in the afternoon. No NPF events were observed inside the rainforest (site T0t) at ground level during the measurement period. However, rain-induced ion and particle bursts (hereafter, rain events) occurred frequently (643 of 1031 days) at both sites during the wet and dry season, being most frequent during the wet season. During the rain events, the ion concentrations in three size ranges (0.8–2, 2–4, and 4–12nm) increased up to about 104–105cm-3. This effect was most pronounced in the intermediate and large size ranges, for which the background ion concentrations were about 10–15cm-3 compared with 700 cm-3 for the cluster ion background. We observed eight NPF events at the pasture site during the wet season. We calculated the growth rates and formation rates of neutral particles and ions for the size ranges 2–3 and 3–7 nm using the ion spectrometer data. The observed median growth rates were 0.8 and 1.6nmh-1 for 2–3nm sized ions and particles, respectively, with larger growth rates (13.3 and 7.9 nmh-1) in the 3–7 nm size range. The measured nucleation rates were of the order of 0.2 cm-3s-1 for particles and 4–9×10-3 cm-3 s-1 for ions. There was no clear difference in the sulfuric acid concentrations between the NPF event days and nonevent days (~9×105 cm-3). The two major differences between the NPF days and nonevent days were a factor of 1.8 lower condensation sink on NPF event days (1.8×10-3 s-1) compared to nonevents (3.2 × 10-3 s-1) and different air mass origins. In conclusion, to our knowledge, this is the first time that results from ground-based sub-3nm aerosol particle measurements have been obtained from the Amazon rainforest.},
doi = {10.5194/acp-18-13245-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 17,
volume = 18,
place = {United States},
year = {2017},
month = {9}
}
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