NOAA/WDS Paleoclimatology - Paleo-pCO2 Database: Miocene pCO2 Reconstruction Data from Clarkia, Idaho
This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Forcing. The data include parameters of climate forcing|plant macrofossils with a geographic location of Idaho, United States Of America. The time period coverage is from 15780000 to 15780000 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
- Cite as: Liang, J.Q.L.; Leng, Q.L.; Hofig, D.H.; Niu, G.N.; Wang, L.W.; Royer, D.; Burke, K.B.; Liang, X.L.; Yang, H.Y.; Zhang, Y.G. (2022-03-30): NOAA/WDS Paleoclimatology - Paleo-pCO2 Database: Miocene pCO2 Reconstruction Data from Clarkia, Idaho. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/vdtv-qf41. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/vdtv-qf41
- noaa-forcing-36233
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-forcing-36233
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Distributor | NOAA National Centers for Environmental Information
ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information
ncei.info@noaa.gov |
Dataset Point of Contact | Data Center Contact
NOAA World Data Service for Paleoclimatology 828-271-4800 paleo@noaa.gov |
Coverage Description | Date Range: 15780000 cal yr BP to 15780000 cal yr BP; |
Time Period | -15778050 to -15778050 |
Spatial Bounding Box Coordinates |
N: 47
S: 47
E: -116.3
W: -116.3
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Spatial Coverage Map |
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Data update frequency not available |
Supplemental Information |
ABSTRACT SUPPLIED BY ORIGINATOR: Leaf gas-exchange models are increasingly used to reconstruct ancient atmospheric carbon dioxide (CO2) concentrations. One of these widely used models, the Franks model, requires stomatal size (guard cell width and either guard cell length or pore length), whole-leaf stomatal density, and bulk-leaf carbon isotope composition (d13C) from plant fossils. However, natural variations of these parameters within and across plant leaves have not been assessed closely, hindering the application of this model and the evaluation of its associated uncertainties. Here we investigate the range of variations of these parameters, and evaluate their impact on the output of the Franks model in three conifers (Metasequoia, Sequoia, and Taxodium). We introduce a modified cleared leaf method that allows accurate measurements of stomatal size. We show that among the stomatal size parameters, pore length is the most variable. Whole-leaf stomatal density can be accurately estimated in a representative area in the middle portion of a leaf. Variations of d13C values are only slightly above analytical errors within a leaf and between leaves from a branchlet, but a ~ 1‰ negative shift of d13C during early decay of Metasequoia leaf tissues was observed. Our measured ranges in pore length and whole-leaf stomatal density have the biggest influence on model estimated CO2. To improve model performance, we recommend (1) the use of our modified cleared leaf method to acquire accurate stomatal size and whole-leaf stomatal density measurements from the middle portion of a leaf located at the middle portion of a branchlet; (2) scaling pore length from guard cell length; and (3) a systematic correction of carbon isotope fractionation may be applicable if information regarding tissue decay and fossil preservation is available. We tested our recommendations by reconstructing CO2 from both extant and fossil materials. Franks model-derived CO2 based upon modern leaves collected in 2004 and 2020 (346 and 416 ppm) are close to their targets (378 and 414 ppm) whereas stomatal frequency methods substantially underestimate (285 and 341 ppm). Reconstructed CO2 from the middle Miocene Clarkia deposit (505 and 507 ppm for Metasequoia and Taxodium) are comparable with published results. We conclude that an improved cleared leaf method for accurate measurements of key stomatal parameters and a statistically-informed stomatal counting strategy will improve the performance of the Franks model for reconstructing CO2 using these conifers with wide distributions of fossil records in the Northern Hemisphere since the Cretaceous.
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Purpose | Records of changes in solar irradiance, volcanic aerosols, atmospheric trace gases, and other properties thought to influence climate in the past. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Last Modified: 2024-03-11
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