Dataset for "Stomatal control of leaf fluxes of carbonyl sulfide and CO2 in a Typha freshwater marsh"

Sun, Wu; Maseyk, Kadmiel; Lett, Céline; Seibt, Ulli

doi:10.15146/r37t00

Cited by 2 publications

(5 citation statements)

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“…These two studies however did not filter for high radiation, which may, because LRU increases at low PAR values (e.g. Kooijmans et al, 2019;Sun et al, 2018), at least partly explain the difference. Our values are also lower (by up to 26 %) across all PFTs, except the boreal needleleaf summergreen and the temperate broadleaf evergreen forest PFTs, compared to those reported recently by Maignan et al (2021), who used the output of the processbased ORCHIDEE model to back-calculate global LRUs.…”

Section: Resultsmentioning

confidence: 96%

“…Code and data availability. The datasets of Kooijmans et al (2019) and Sun et al (2018) are available from https://doi.org/10.5281/zenodo.1211481 (Kooijmans et al, 2018) and https://doi.org/10.15146/R37T00 (Sun et al, 2017), respectively. Air temperature, VPD and the digital elevation model were taken from https://chelsa-climate.org (CHELSA, 2023), incident PAR was taken from https://www.environment.snu.ac.kr/bess-rad (BESS-Rad, 2023) and CO 2 mole fractions were taken from https://doi.org/10.5281/zenodo.5021361 (Cheng et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

“…For validation we retrieved the datasets underlying the work by Kooijmans et al (2019) and Sun et al (2018) from the associated data repositories. Kooijmans et al (2019) investigated the leaf-scale COS exchange of Scots pine (Pinus sylvestris) at the study site Hyytiälä in Finland (61 • 51 N, 24 • 17 E) using two independent chambers, while Sun et al (2018) studied the leaf-scale COS exchange of broadleaf cattail (Typha latifolia) at the San Joaquin freshwater marsh site in California, USA (33 • 39 N, 117 • 51 W). The major environmental difference between both studies is air temperature, which was ca.…”

Section: Data and Model Applicationmentioning

confidence: 99%

“…The major environmental difference between both studies is air temperature, which was ca. 7 and 22 • C during the study period of Kooijmans et al (2019) and Sun et al (2018), respectively. The latter dataset did not include air pressure, which was inferred from elevation using the equation implemented in the P model (Wang et al, 2017a).…”

Section: Data and Model Applicationmentioning

confidence: 99%

“…Here it should be noted that some of the higher values may result from measurements under low, non-saturating light conditions, which are known to cause LRU to increase (Kooijmans et al, 2019). More recently, two field studies (Kooijmans et al, 2019;Sun et al, 2018) reported values around 1 under high incident photosynthetically active radiation (PAR).…”

Section: Introductionmentioning

confidence: 98%

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Technical note: Novel estimates of the leaf relative uptake rate of carbonyl sulfide from optimality theory

et al. 2023

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Abstract. In order to estimate the gross primary productivity (GPP) of terrestrial ecosystems from the canopy uptake of carbonyl sulfide (COS), leaf relative uptake rate (LRU) of COS with respect to carbon dioxide needs to be known a priori. Currently, the variability of LRU between plant species in different biomes of the world is poorly understood, making the choice of an appropriate LRU uncertain and hampering further progress towards developing COS as a tracer of GPP. Here we propose a novel approach for estimating light-saturated LRU based on plant optimality principles, validate it against in situ leaf gas exchange measurements and provide global monthly climatological estimates. The global vegetation season average simulated LRUs fall into the 95 % range of 0.68–1.58 and are thus lower than most other published global estimates. We advocate for these LRU estimates to be adopted by global modellers in order to test to what degree these are compatible with our current understanding of the sources and sinks in the global COS budget.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Data and Model Applicationmentioning

confidence: 99%

Section: Data and Model Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Technical note: Novel estimates of the leaf relative uptake rate of carbonyl sulfide from optimality theory

et al. 2023

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Stomatal control of leaf fluxes of carbonyl sulfide and CO<sub>2</sub> in a <i>Typha</i> freshwater marsh

Sun¹,

Maseyk²,

Lett³

et al. 2017

Preprint

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Abstract. Carbonyl sulfide (COS) is an emerging tracer to constrain land photosynthesis at canopy to global scales, because leaf COS and CO 2 uptake processes are linked through stomatal diffusion. The COS tracer approach requires knowledge of the concentration normalized ratio of COS uptake to photosynthesis, commonly known as the leaf relative uptake (LRU). LRU is known to vary with light, but the environmental controls over LRU variability in the field are poorly understood due to scant leaf scale observations. 5Here we present the first direct observations of the LRU versus light relationship in the field. We measured leaf COS and CO 2 fluxes at a freshwater marsh in summer 2013. Daytime leaf COS and CO 2 uptake showed similar peaks in the mid-morning and late afternoon, separated by a midday depression, highlighting the common stomatal control on COS and CO 2 diffusion.At night, in contrast to CO 2 , COS uptake continued, indicating partially open stomata. LRU ratios showed a clear relationship with photosynthetically active radiation (PAR), converging to 1.0 at high PAR, while increasing sharply at low PAR. Daytime 10 integrated LRU ranged from 1 to 1.5, with a mean of 1.2 across the campaign, significantly lower than the mean value reported from laboratory measurements (∼1.6). Our results indicate two major determinants of LRU-light and vapor pressure deficit (or evaporative demand). Light is the primary driver of LRU because CO 2 reactions are light limited but the COS reaction is not. In a secondary effect, high evaporative demand tends to reduce LRU values. During periods of high evaporative demand, leaves conserve water by partial stomatal closure. This reduces COS uptake more than CO 2 uptake because stomatal resistance 15 is a more dominant component in the COS diffusional pathway. High evaporative demand usually coincides with high PAR, leading to the lowest observed LRU in the afternoon. Our findings illustrate the stomatal coupling of COS and CO 2 uptake during the most photosynthetically active period in the field, and provide important characterization of LRU, a key parameter to support the use of COS as a photosynthetic tracer.

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Dataset for "Stomatal control of leaf fluxes of carbonyl sulfide and CO2 in a Typha freshwater marsh"

Cited by 2 publications

References 1 publication

Technical note: Novel estimates of the leaf relative uptake rate of carbonyl sulfide from optimality theory

Technical note: Novel estimates of the leaf relative uptake rate of carbonyl sulfide from optimality theory

Stomatal control of leaf fluxes of carbonyl sulfide and CO<sub>2</sub> in a <i>Typha</i> freshwater marsh

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Dataset for "Stomatal control of leaf fluxes of carbonyl sulfide and CO2 in a Typha freshwater marsh"

Cited by 2 publications

References 1 publication

Technical note: Novel estimates of the leaf relative uptake rate of carbonyl sulfide from optimality theory

Technical note: Novel estimates of the leaf relative uptake rate of carbonyl sulfide from optimality theory

Stomatal control of leaf fluxes of carbonyl sulfide and CO&lt;sub&gt;2&lt;/sub&gt; in a &lt;i&gt;Typha&lt;/i&gt; freshwater marsh

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Stomatal control of leaf fluxes of carbonyl sulfide and CO<sub>2</sub> in a <i>Typha</i> freshwater marsh