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

Rastogi, Bharat; Berkelhammer, Max; Wharton, Sonia; Whelan, Mary E.; Itter, Malcolm S.; Leen, J. Brian; Gupta, Manish X.; Noone, David; Still, Christopher J.

doi:10.1029/2018JG004430

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

Journal Article · Sun Sep 23 00:00:00 EDT 2018 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2018JG004430· OSTI ID:1489460

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^[2]; Wharton, Sonia ^[3];

^[4]; Itter, Malcolm S. ^[5]; Leen, J. Brian ^[6]; Gupta, Manish X. ^[6];

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Oregon State Univ., Corvallis, OR (United States)
Univ. of Illinois at Chicago, Chicago IL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Carnegie Institution for Science Stanford, CA (United States)
Michigan State Univ., East Lansing, MI (United States)
ABB – Los Gatos Research Orchard, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; SC0006449

OSTI ID:: 1489460

Alternate ID(s):: OSTI ID: 1480881

Report Number(s):: LLNL-JRNL-759507; 947551

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 123, Issue 11; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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54 ENVIRONMENTAL SCIENCES
carbonyl sulfide
old growth forests
GPP
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epiphytes