Constraining conifer physiological parameters in leaf gas-exchange models for ancient CO2 reconstruction

Liang, Jiaqi; Leng, Qin; Hofig, Daianne F.; Niu, Gao; Wang, Li; Royer, Dana L.; Burke, K.; Xiao, Liang; Zhang, Yige; Hong, Yang

doi:10.1016/j.gloplacha.2022.103737

Cited by 12 publications

(7 citation statements)

References 84 publications

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“…For the treatment of leaf fossils, the fossils were photographed with a Leica M165FC stereomicroscope. The cuticular analysis was performed according to the procedure described by Liang et al [ 33 ]. The fossils were moistened well in distilled water and then soaked in 20% HCl solution for 12 h to remove calcareous sediments; then, they were washed to neutrality using distilled water.…”

Section: Methodsmentioning

confidence: 99%

Late Miocene Leaves and Endocarps of Choerospondias (Anacardiaceae) from Zhejiang, Eastern China: Implications for Paleogeography and Paleoclimate

Xiao

Guo

et al. 2022

Biology

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Choerospondias (Anacardiaceae), characterized by radially arranged germination pores near the top, is a monotypic genus mainly distributed in subtropical and tropical eastern Asia, while fossil records indicate a wide distribution throughout Eurasia during the Cenozoic. In this study, we reported three-dimensionally preserved Choerospondias endocarps, and the associated compressed leaves from the late Miocene Shengxian Formation in Tiantai, Zhejiang, eastern China. The plant remains were assigned to two new fossil species. The endocarps were identified as Choerospondias tiantaiensis sp. nov., and the leaves were identified as Choerospondias mioaxillaris sp. nov. Based on fossil records and climate fluctuation during the Cenozoic, we conclude that Choerospondias may have originated from Europe in the early Eocene and then spread to Asia along the coast and island chains of the Tethys and Paratethys oceans. The distribution position of the current fossils was adjacent to the northern boundary of the modern distribution of Choerospondias in East Asia, indicating that the distribution pattern of Choerospondias in East Asia likely formed no later than the late Miocene. We reconstructed the late Miocene paleoclimate of eastern Zhejiang by using the method of climate analysis of endemic species (CAES), and then compared it to the data reconstructed in previous studies. The results indicate that the late Miocene climate in eastern Zhejiang was similar to or warmer and more humid than the modern climate in this region.

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Section: Methodsmentioning

confidence: 99%

Late Miocene Leaves and Endocarps of Choerospondias (Anacardiaceae) from Zhejiang, Eastern China: Implications for Paleogeography and Paleoclimate

Xiao

Guo

et al. 2022

Biology

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“…To obtain clean cuticles of the fossil leaves, we used a traditional method that was modified by Liang et al [ 48 ]. The specimens were soaked in 20% HCl for 2 h to remove carbonate sediments and washed repeatedly with distilled water until the solution was neutral.…”

Section: Methodsmentioning

confidence: 99%

A New Species of Comptonia (Myricaceae) from the Early Miocene of Central Inner Mongolia, China, and Phytogeographic History of Sweet–Fern

Xiao

Guo

et al. 2022

Biology

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Comptonia (Myricaceae) is well known as a monotypic genus living only in eastern North America; however, fossils show that the genus occurred extensively in the Northern Hemisphere during the Cenozoic. We observed dozens of Comptonia leaf fossils from the early Miocene in Zhuozi, China. The leaf architecture characteristics and epidermal features of the fossil specimens are described in detail here for the first time, and they were assigned to a new species: Comptonia hirsuta. The fruit fossils collected simultaneously from the same layer were assigned to Comptonia tymensis. The global fossil records indicate that the spatial distribution range of Comptonia reached its peak in both the Eocene and Miocene as two warm periods and then gradually decreased in the Oligocene, as well as after the late Miocene, because of the cooling global climate. Furthermore, the Comptonia taxon in East Asia may have migrated from North America via the Bering route in the late Paleocene or Eocene. Plant exchange between western Europe and eastern North America possibly occurred during the Eocene via the Thulean route. Phytogeographic variation in the Comptonia fossils from China also indicates that the reason for the disappearance of Comptonia from China may not only be due to the prolonged cooling and drying after the late Miocene, but also due to its progenitive pattern.

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“…(d) SST estimates as in (c), but assuming Mg/Ca sensitivity to pH (Gray & Evans, 2019). (e) Our new paleo-CO 2 estimates from T. trilobus (large blue circles outlined in black), G. pseudopraebulloides (large golden circles outlined in black), and C. angulisuturalis (large purple circles outlined in black) in context of published multiproxy reconstructions from boron isotopes (small circles, with colors corresponding to species- Greenop et al, 2014Greenop et al, , 2019Sosdian et al, 2018), phytoplankton (gray squares, Rae et al, 2021;Super et al, 2018), and leaf stomata (gray triangles, Erdei et al, 2012;Liang et al, 2022;Londoño et al, 2018;Moraweck et al, 2019;Reichgelt et al, 2020;Roth-Nebelsick et al, 2014;Steinthorsdottir et al, 2021;Tesfamichael et al, 2017). All boron-based CO 2 estimates, including those derived from published data, were calculated using δ 11 B sw from Greenop et al (2017) and alkalinity from Zeebe and Tyrrell (2019).…”

Section: Co 2 and Climate In The Late Oligocene-early Miocenementioning

confidence: 99%

“…It is therefore crucial to improve data coverage from independent proxies and gain a more complete understanding of the evolution and operation (Westerhold et al, 2020), (b) estimates of deep ocean temperature using clumped isotopes (Meckler et al, 2022) and (c) published atmospheric CO 2 estimates from the mid-Eocene to mid-Miocene from different proxy methods. Estimates from boron isotopes are shown in orange (Anagnostou et al, 2020;Greenop et al, 2019;Sosdian et al, 2018), phytoplankton estimates by gray squares (Rae et al, 2021;Super et al, 2018), and leaf gas exchange by gray triangles (Erdei et al, 2012;Liang et al, 2022;Londoño et al, 2018;Moraweck et al, 2019;Reichgelt et al, 2020;Roth-Nebelsick et al, 2014;Steinthorsdottir et al, 2021;Tesfamichael et al, 2017). Published CO 2 estimates from boron isotopes for the Oligocene and Miocene were recalculated using our methods described in Methods Sections 2.5 and 2.6, and using reported δ 11 B and Mg/Ca data from the original studies.…”

mentioning

confidence: 99%

Atmospheric CO₂ Estimates for the Late Oligocene and Early Miocene Using Multi‐Species Cross‐Calibrations of Boron Isotopes

Anderson,

Hönisch,

Coxall

et al. 2024

Paleoceanog and Paleoclimatol

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The boron isotope (δ11B) proxy for seawater pH is a tried and tested means to reconstruct atmospheric CO2 in the geologic past, but uncertainty remains over how to treat species‐specific calibrations that link foraminiferal δ11B to pH estimates prior to 22 My. In addition, no δ11B‐based reconstructions of atmospheric CO2 exist for wide swaths of the Oligocene (33–23 Ma), and large variability in CO2 reconstructions during this epoch based on other proxy evidence leaves climate evolution during this period relatively unconstrained. To add to our understanding of Oligocene and early Miocene climate, we generated new atmospheric CO2 estimates from new δ11B data from fossil shells of surface‐dwelling planktic foraminifera from the mid‐Oligocene to early Miocene (∼28–18 Ma). We estimate atmospheric CO2 of ∼680 ppm for the mid‐Oligocene, which then evolves to fluctuate between ∼500–570 ppm during the late Oligocene and between ∼420–700 ppm in the early Miocene. These estimates tend to trend higher than Oligo‐Miocene CO2 estimates from other proxies, although we observe good proxy agreement in the late Oligocene. Reconstructions of CO2 fall lower than estimates from paleoclimate model simulations in the early Miocene and mid Oligocene, which indicates that more proxy and/or model refinement is needed for these periods. Our species cross‐calibrations, assessing δ11B, Mg/Ca, δ18O, and δ13C, are able to pinpoint and evaluate small differences in the geochemistry of surface‐dwelling planktic foraminifera, lending confidence to paleoceanographers applying this approach even further back in time.

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Constraining conifer physiological parameters in leaf gas-exchange models for ancient CO2 reconstruction

Cited by 12 publications

References 84 publications

Late Miocene Leaves and Endocarps of Choerospondias (Anacardiaceae) from Zhejiang, Eastern China: Implications for Paleogeography and Paleoclimate

Late Miocene Leaves and Endocarps of Choerospondias (Anacardiaceae) from Zhejiang, Eastern China: Implications for Paleogeography and Paleoclimate

A New Species of Comptonia (Myricaceae) from the Early Miocene of Central Inner Mongolia, China, and Phytogeographic History of Sweet–Fern

Atmospheric CO₂ Estimates for the Late Oligocene and Early Miocene Using Multi‐Species Cross‐Calibrations of Boron Isotopes

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Constraining conifer physiological parameters in leaf gas-exchange models for ancient CO2 reconstruction

Cited by 12 publications

References 84 publications

Late Miocene Leaves and Endocarps of Choerospondias (Anacardiaceae) from Zhejiang, Eastern China: Implications for Paleogeography and Paleoclimate

Late Miocene Leaves and Endocarps of Choerospondias (Anacardiaceae) from Zhejiang, Eastern China: Implications for Paleogeography and Paleoclimate

A New Species of Comptonia (Myricaceae) from the Early Miocene of Central Inner Mongolia, China, and Phytogeographic History of Sweet–Fern

Atmospheric CO2 Estimates for the Late Oligocene and Early Miocene Using Multi‐Species Cross‐Calibrations of Boron Isotopes

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Atmospheric CO₂ Estimates for the Late Oligocene and Early Miocene Using Multi‐Species Cross‐Calibrations of Boron Isotopes