Reconciling Observed and Predicted Tropical Rainforest OH Concentrations

Jeong, Daun; Seco, Roger; Emmons, Louisa; Schwantes, Rebecca; Liu, Yingjun; McKinney, Karena A.; Martin, Scot T.; Keutsch, Frank N.; Gu, Dasa; Guenther, Alex B.; Vega, Oscar; Tota, Julio; Souza, Rodrigo A. F.; Springston, Stephen R.; Watson, Thomas B.; Kim, Saewung

doi:10.1029/2020jd032901

i

Reconciling Observed and Predicted Tropical Rainforest OH Concentrations

2022
By Jeong, Daun ; Seco, Roger ; Emmons, Louisa ; ...

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Jeong, Daun ; Seco, Roger ; Emmons, Louisa ; Schwantes, Rebecca ; Liu, Yingjun ; McKinney, Karena A. ; Martin, Scot T. ; Keutsch, Frank N. ; Gu, Dasa ; Guenther, Alex B. ; Vega, Oscar ; Tota, Julio ; Souza, Rodrigo A. F. ; Springston, Stephen R. ; Watson, Thomas B. ; Kim, Saewung
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory)
Description:

We present OH observations made in Amazonas, Brazil during the Green Ocean Amazon campaign (GoAmazon2014/5) from February to March of 2014. The average diurnal variation of OH peaked with a midday (10:00–15:00) average of 1.0 × 106 (±0.6 × 106) molecules cm−3. This was substantially lower than previously reported in other tropical forest photochemical environments (2–5 × 106 molecules cm−3) while the simulated OH reactivity was lower. The observational data set was used to constrain a box model to examine how well current photochemical reaction mechanisms can simulate observed OH. We used one near‐explicit mechanism (MCM v3.3.1) and four condensed mechanisms (i.e., RACM2, MOZART‐T1, CB05, CB6r2) to simulate OH. A total of 14 days of analysis shows that all five chemical mechanisms were able to explain the measured OH within instrumental uncertainty of 40% during the campaign in the Amazonian rainforest environment. Future studies are required using more reliable NOx and VOC measurements to further investigate discrepancies in our understanding of the radical chemistry in the tropical rainforest.
Source:

Journal of Geophysical Research: Atmospheres, 127(1)
DOI:

https://doi.org/10.1029/2020jd032901
ISSN:

2169-897X ; 2169-8996
Format:

pdf
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Rights Information:

Other
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Library
Main Document Checksum:

urn:sha-512:fc6285d1862d3676c9e995e6dd6b46c70c3bf2ea13c0ed35a4b702f62fb823cdee84906aba432629d5d623f3943ac457739bb1b479eef00ac2663fb456da7bd1
Download URL:

https://repository.library.noaa.gov/view/noaa/68543/noaa_68543_DS1.pdf
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[PDF - 2.52 MB ]

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