PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest
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PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest. / Sarkar, Chinmoy; Guenther, Alex B.; Park, Jeong Hoo; Seco, Roger; Alves, Eliane; Batalha, Sarah; Santana, Raoni; Kim, Saewung; Smith, James; Tóta, Julio; Vega, Oscar.
I: Atmospheric Chemistry and Physics, Bind 20, Nr. 12, 2020, s. 7179-7191.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - PTR-TOF-MS eddy covariance measurements of isoprene and monoterpene fluxes from an eastern Amazonian rainforest
AU - Sarkar, Chinmoy
AU - Guenther, Alex B.
AU - Park, Jeong Hoo
AU - Seco, Roger
AU - Alves, Eliane
AU - Batalha, Sarah
AU - Santana, Raoni
AU - Kim, Saewung
AU - Smith, James
AU - Tóta, Julio
AU - Vega, Oscar
PY - 2020
Y1 - 2020
N2 - Biogenic volatile organic compounds (BVOCs) are important components of the atmosphere due to their contribution to atmospheric chemistry and biogeochemical cycles. Tropical forests are the largest source of the dominant BVOC emissions (e.g. isoprene and monoterpenes). In this study, we report isoprene and total monoterpene flux measurements with a proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) using the eddy covariance (EC) method at the Tapajos National Forest (2.857 S, 54.959 W), a primary rainforest in eastern Amazonia. Measurements were carried out from 1 to 16 June 2014, during the wet-to-dry transition season. During the measurement period, the measured daytime (06:00- 18:00 LT) average isoprene mixing ratios and fluxes were 1:15-0:60 ppb and 0:55-0:71 mgCm-2 h-1, respectively, whereas the measured daytime average total monoterpene mixing ratios and fluxes were 0:14-0:10 ppb and 0:20- 0:25 mgCm-2 h-1, respectively. Midday (10:00-14:00 LT) average isoprene and total monoterpene mixing ratios were 1:70-0:49 and 0:24-0:05 ppb, respectively, whereas midday average isoprene and monoterpene fluxes were 1:24- 0:68 and 0:46-0:22 mgCm-2 h-1, respectively. Isoprene and total monoterpene emissions in Tapajos were correlated with ambient temperature and solar radiation. Significant correlation with sensible heat flux, SHF (r2 D 0:77), was also observed. Measured isoprene and monoterpene fluxes were strongly correlated with each other (r2 D 0:93). The MEGAN2.1 (Model of Emissions of Gases and Aerosols from Nature version 2.1) model could simulate most of the observed diurnal variations (r2 D 0:7 to 0.8) but declined a little later in the evening for both isoprene and total monoterpene fluxes. The results also demonstrate the importance of site-specific vegetation emission factors (EFs) for accurately simulating BVOC fluxes in regional and global BVOC emission models.
AB - Biogenic volatile organic compounds (BVOCs) are important components of the atmosphere due to their contribution to atmospheric chemistry and biogeochemical cycles. Tropical forests are the largest source of the dominant BVOC emissions (e.g. isoprene and monoterpenes). In this study, we report isoprene and total monoterpene flux measurements with a proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) using the eddy covariance (EC) method at the Tapajos National Forest (2.857 S, 54.959 W), a primary rainforest in eastern Amazonia. Measurements were carried out from 1 to 16 June 2014, during the wet-to-dry transition season. During the measurement period, the measured daytime (06:00- 18:00 LT) average isoprene mixing ratios and fluxes were 1:15-0:60 ppb and 0:55-0:71 mgCm-2 h-1, respectively, whereas the measured daytime average total monoterpene mixing ratios and fluxes were 0:14-0:10 ppb and 0:20- 0:25 mgCm-2 h-1, respectively. Midday (10:00-14:00 LT) average isoprene and total monoterpene mixing ratios were 1:70-0:49 and 0:24-0:05 ppb, respectively, whereas midday average isoprene and monoterpene fluxes were 1:24- 0:68 and 0:46-0:22 mgCm-2 h-1, respectively. Isoprene and total monoterpene emissions in Tapajos were correlated with ambient temperature and solar radiation. Significant correlation with sensible heat flux, SHF (r2 D 0:77), was also observed. Measured isoprene and monoterpene fluxes were strongly correlated with each other (r2 D 0:93). The MEGAN2.1 (Model of Emissions of Gases and Aerosols from Nature version 2.1) model could simulate most of the observed diurnal variations (r2 D 0:7 to 0.8) but declined a little later in the evening for both isoprene and total monoterpene fluxes. The results also demonstrate the importance of site-specific vegetation emission factors (EFs) for accurately simulating BVOC fluxes in regional and global BVOC emission models.
U2 - 10.5194/acp-20-7179-2020
DO - 10.5194/acp-20-7179-2020
M3 - Journal article
AN - SCOPUS:85087160868
VL - 20
SP - 7179
EP - 7191
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
SN - 1680-7316
IS - 12
ER -
ID: 244298121