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Title: Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications

Abstract

Diurnal and vertical patterns of carbonyl sulfide (OCS) and CO2 mixing ratios above and within a 60–m–tall old–growth temperate forest are presented. Canopy air from four different heights was sampled in situ using a continuous integrated cavity output spectroscopy analyzer during August–September 2014. Measurements revealed large vertical gradients in OCS, from which we inferred ecosystem fluxes. The diurnal cycle of OCS mixing ratios at all heights exhibited a typical pattern characterized by nighttime drawdown, an early morning minimum, and a maximum of OCS around midday. Daytime increase in the upper canopy is attributed to entrainment of planetary boundary layer air into the canopy. The ecosystem was found to be a large daytime sink of OCS (mean maximum daytime flux ~ –75 pmol · m–2 · s–1). Mean leaf relative uptake (concentration normalized uptake of OCS flux to CO2 uptake) was found to be 6.9. We discuss this high leaf relative uptake in the context of the presence and distribution of epiphytes at the site. While epiphytic uptake of OCS has been studied before, we show for the first time that this may contribute significantly to ecosystem fluxes under humid or moist conditions. We test this theory using a chamber experimentmore » measuring epiphytic fluxes for two species of lichen and one moss species (in situ and in a laboratory). Lastly, we suggest that the role of epiphytes should be explicitly considered when using OCS as a tracer of ecosystem–scale photosynthesis in forest ecosystems with abundant epiphytic cover and biomass.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6];  [6]; ORCiD logo [1]; ORCiD logo [1]
  1. Oregon State Univ., Corvallis, OR (United States)
  2. Univ. of Illinois at Chicago, Chicago IL (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Carnegie Institution for Science Stanford, CA (United States)
  5. Michigan State Univ., East Lansing, MI (United States)
  6. ABB – Los Gatos Research Orchard, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1489460
Alternate Identifier(s):
OSTI ID: 1480881
Report Number(s):
LLNL-JRNL-759507
Journal ID: ISSN 2169-8953; 947551
Grant/Contract Number:  
AC52-07NA27344; SC0006449
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 123; Journal Issue: 11; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; carbonyl sulfide; old growth forests; GPP; canopy coupling; epiphytes

Citation Formats

Rastogi, Bharat, Berkelhammer, Max, Wharton, Sonia, Whelan, Mary E., Itter, Malcolm S., Leen, J. Brian, Gupta, Manish X., Noone, David, and Still, Christopher J. Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications. United States: N. p., 2018. Web. https://doi.org/10.1029/2018JG004430.
Rastogi, Bharat, Berkelhammer, Max, Wharton, Sonia, Whelan, Mary E., Itter, Malcolm S., Leen, J. Brian, Gupta, Manish X., Noone, David, & Still, Christopher J. Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications. United States. https://doi.org/10.1029/2018JG004430
Rastogi, Bharat, Berkelhammer, Max, Wharton, Sonia, Whelan, Mary E., Itter, Malcolm S., Leen, J. Brian, Gupta, Manish X., Noone, David, and Still, Christopher J. Sun . "Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications". United States. https://doi.org/10.1029/2018JG004430. https://www.osti.gov/servlets/purl/1489460.
@article{osti_1489460,
title = {Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications},
author = {Rastogi, Bharat and Berkelhammer, Max and Wharton, Sonia and Whelan, Mary E. and Itter, Malcolm S. and Leen, J. Brian and Gupta, Manish X. and Noone, David and Still, Christopher J.},
abstractNote = {Diurnal and vertical patterns of carbonyl sulfide (OCS) and CO2 mixing ratios above and within a 60–m–tall old–growth temperate forest are presented. Canopy air from four different heights was sampled in situ using a continuous integrated cavity output spectroscopy analyzer during August–September 2014. Measurements revealed large vertical gradients in OCS, from which we inferred ecosystem fluxes. The diurnal cycle of OCS mixing ratios at all heights exhibited a typical pattern characterized by nighttime drawdown, an early morning minimum, and a maximum of OCS around midday. Daytime increase in the upper canopy is attributed to entrainment of planetary boundary layer air into the canopy. The ecosystem was found to be a large daytime sink of OCS (mean maximum daytime flux ~ –75 pmol · m–2 · s–1). Mean leaf relative uptake (concentration normalized uptake of OCS flux to CO2 uptake) was found to be 6.9. We discuss this high leaf relative uptake in the context of the presence and distribution of epiphytes at the site. While epiphytic uptake of OCS has been studied before, we show for the first time that this may contribute significantly to ecosystem fluxes under humid or moist conditions. We test this theory using a chamber experiment measuring epiphytic fluxes for two species of lichen and one moss species (in situ and in a laboratory). Lastly, we suggest that the role of epiphytes should be explicitly considered when using OCS as a tracer of ecosystem–scale photosynthesis in forest ecosystems with abundant epiphytic cover and biomass.},
doi = {10.1029/2018JG004430},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 11,
volume = 123,
place = {United States},
year = {2018},
month = {9}
}

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Figures / Tables:

Fig. 1 Fig. 1: LAI profile from Parker [1997] (a), along with mean diurnal cycles of air temperature (b), relative humidity (c), wind speed (d), and carbon fluxes (e). Measurements were made at 70m (above canopy) and 2m (near surface). Carbon fluxes were only measured at 70m. Vertical bars represent standard errors.more » Dotted black vertical lines indicate time of sunrise and sunset. All times are Pacific Standard time (GMT – 7).« less

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    Works referencing / citing this record:

    Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest
    journal, July 2019

    • Jiang, Yueyang; Still, Christopher J.; Rastogi, Bharat
    • Environmental Research Letters, Vol. 14, Issue 7
    • DOI: 10.1088/1748-9326/ab2612

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