Claim · model-written summary
Reconstructed CO2 for Metasequoia from the middle Miocene Clarkia deposit was 505 ppm, comparable with published results.
- Taxon
- Metasequoia
Metasequoiae0 - Outcome
- Reconstructed CO2e0
- Value
- 505e0
- Comparator
- published resultse0
- Setting
- middle Miocene Clarkia deposite0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentDirectionQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reconstructed CO2 from the middle Miocene Clarkia deposit (505 and 507 ppm for Metasequoia and Taxodium) are comparable with published results”
Title
Jia-Qi Liang; Qin Leng; Daianne F. Höfig; et al. Global and Planetary Change 2022. doi:10.1016/j.gloplacha.2022.103737
Other claims from this paper (16)
- Method / resource The modified cleared leaf method allowed accurate stomatal-size measurement.
- Observation Pore length was the most variable stomatal size parameter.
- Method / resource Whole-leaf stomatal density could be estimated accurately from a representative area in the middle of a leaf.
- Observation Within-leaf and between-leaf δ13C variation was only slightly above analytical error.
- Observation Early decay of Metasequoia leaf tissue produced an approximately 1‰ negative δ13C shift.
- Association The measured pore-length range had a major influence on model-estimated CO2.
- Association The measured whole-leaf stomatal-density range had a major influence on model-estimated CO2.
- Recommendation The authors recommend using the modified cleared leaf method to measure stomatal size and density in the middle of leaves and branchlets.
- Recommendation The authors recommend scaling pore length from guard cell length.
- Recommendation The authors suggest correcting carbon isotope fractionation when tissue decay and fossil preservation information is available.
- Method / resource Franks model CO2 estimates from 2004 modern leaves were 346 ppm versus a 378 ppm target.
- Method / resource Franks model CO2 estimates from 2020 modern leaves were 416 ppm versus a 414 ppm target.
- Method / resource Stomatal frequency methods underestimated modern CO2 at 285 ppm.
- Method / resource Stomatal frequency methods underestimated modern CO2 at 341 ppm.
- Method / resource Reconstructed CO2 for Taxodium from the middle Miocene Clarkia deposit was 507 ppm, comparable with published results.
- Method / resource The improved leaf-clearing and stomatal-counting methods are expected to improve Franks model CO2 reconstruction performance.