Title: Ecosystem fluxes of carbonyl sulfide in an old-growth forest: temporal dynamics and responses to diffuse radiation and heat waves

Journal Article · · Biogeosciences (Online)

Carbonyl sulfide (OCS) has recently emerged as a tracer for terrestrial carbon uptake. While physiological studies relating OCS fluxes to leaf stomatal dynamics have been established at leaf and branch scales and incorporated into global carbon cycle models, the quantity of data from ecosystem-scale field studies remains limited. In this study, we employ established theoretical relationships to infer ecosystem-scale plant OCS uptake from mixing ratio measurements. OCS fluxes showed a pronounced diurnal cycle, with maximum uptake at midday. OCS uptake was found to scale within dependent measurements of CO2 fluxes over a 60 m tall old-growth forest in the Pacific Northwest of the US (45°49'13.76" N,121 °57'06.88" W) at daily and monthly timescales under mid–high light conditions across the growing season in 2015. OCS fluxes were strongly influenced by the fraction of down welling diffuse light. Finally, we examine the effect of sequential heat waves on fluxes of OCS, CO2, and H2O. Our results bolster previous evidence that ecosystem OCS uptake is strongly related to stomatal dynamics,and measuring this gas improves constraints on estimating photosynthetic rates at the ecosystem scale.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1577945
Report Number(s):
LLNL-JRNL-798098; 1000467
Journal Information:
Biogeosciences (Online), Journal Name: Biogeosciences (Online) Journal Issue: 23 Vol. 15; ISSN 1726-4189
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Carbonyl sulfide (COS) and carbon disulfide (CS2) exchange fluxes between cotton fields and the atmosphere in the arid area in Xinjiang, China journal March 2019
Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest journal July 2019
Reviews and syntheses: Carbonyl sulfide as a multi-scale tracer for carbon and water cycles journal January 2018

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