Massive perturbations to atmospheric sulfur in the aftermath of the Chicxulub impact

Junium, Christopher K.; Zerkle, Aubrey L.; Witts, James D.; Ivany, Linda C.; Yancey, Thomas E.; Liu, Chengjie; Claire, Mark

doi:10.1073/pnas.2119194119

Cited by 11 publications

(3 citation statements)

References 68 publications

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“…Following this assumption, S-MIF observed in ice cores and post-GOE sediments is interpreted as a compelling evidence of stratospheric volcanic eruptions that allow profound productions of isotopic anomalous sulfates above the ozone layer in the stratosphere, which subsequently deposit on the Earth’s surface . The presence of S-MIF after the GOE has been used as a proxy to evaluate the influence of past stratospheric eruptions on paleoclimate and mass extinction. − The observation of S-MIF in Martian meteorites is also utilized to reconstruct photochemistry of the Martian atmosphere …”

Section: Introductionmentioning

confidence: 99%

Toward the Origins of Quadruple Sulfur Isotope Anomalies in Modern Sulfate: A Multitracer Approach and Implications for Paleo- and Planetary Atmospheres

Yin

Lin

et al. 2023

ACS Earth Space Chem.

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Sulfur isotope mass-independent fractionation signatures (S-MIF) have been widely found in modern sulfate aerosols. Their mechanistic origins and potential implications for atmospheric sulfate formation chemistry are however poorly understood. Of particular importance is that the mystery of modern sulfate S-MIF hinders precise interpretations of S-MIF in geological sediment and meteorite samples. Here, we examine several proposed origins of modern sulfate S-MIF using a multiple-tracer approach. Quadruple sulfur isotopes of sulfate aerosols collected from Guangzhou, a megacity in South China, were measured along with various chemical and isotopic tracers for high-altitude air masses, biomass burning, and mineral dusts in the same samples. Similar to previous studies, we found that negative Δ36S values in modern sulfate aerosols are linked to combustions, and to a larger extent, to high-temperature processes that may involve symmetry-dependent recombination reactions of sulfur. The origins of Δ33S anomalies widely observed in modern sulfate aerosols remain elusive and require further investigation before we can unambiguously use this proxy to quantify sulfur emission and transformation pathways in the modern atmosphere. From a comparative planetology perspective, we highlight that a complete understanding of S-MIF in modern aerosols is crucial for tracking paleo- and planetary atmospheres by multiple sulfur isotope measurements in Phanerozoic sediments and Martian meteorites because their S-MIF magnitudes are similar.

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Section: Introductionmentioning

confidence: 99%

Toward the Origins of Quadruple Sulfur Isotope Anomalies in Modern Sulfate: A Multitracer Approach and Implications for Paleo- and Planetary Atmospheres

Yin

Lin

et al. 2023

ACS Earth Space Chem.

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“…Additionally, a wave of WGD events have been identified in different angiosperm lineages around the Cretaceous‐Paleogene (K‐Pg) boundary (Fawcett et al ., 2009; Vanneste et al ., 2014; Van de Peer et al ., 2017; Wu et al ., 2020). The K‐Pg boundary is marked by mass extinctions triggered by an asteroid impact that caused prolonged global cooling and darkness on Earth (Pope et al ., 1997; Vellekoop et al ., 2014; Junium et al ., 2022).…”

Section: Introductionmentioning

confidence: 99%

Convergent and/or parallel evolution of RNA‐binding proteins in angiosperms after polyploidization

Guo,

Wang,

Jiao

et al. 2024

New Phytologist

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Summary Increasing studies suggest that the biased retention of stress‐related transcription factors (TFs) after whole‐genome duplications (WGDs) could rewire gene transcriptional networks, facilitating plant adaptation to challenging environments. However, the role of posttranscriptional factors (e.g. RNA‐binding proteins, RBPs) following WGDs has been largely ignored. Uncovering thousands of RBPs in 21 representative angiosperm species, we integrate genomic, transcriptomic, regulatomic, and paleotemperature datasets to unravel their evolutionary trajectories and roles in adapting to challenging environments. We reveal functional enrichments of RBP genes in stress responses and identify their convergent retention across diverse angiosperms from independent WGDs, coinciding with global cooling periods. Numerous RBP duplicates derived from WGDs are then identified as cold‐induced. A significant overlap of 29 orthogroups between WGD‐derived and cold‐induced RBP genes across diverse angiosperms highlights a correlation between WGD and cold stress. Notably, we unveil an orthogroup (Glycine‐rich RNA‐binding Proteins 7/8, GRP7/8) and relevant TF duplicates (CCA1/LHY, RVE4/8, CBF2/4, etc.), co‐retained in different angiosperms post‐WGDs. Finally, we illustrate their roles in rewiring circadian and cold‐regulatory networks at both transcriptional and posttranscriptional levels during global cooling. Altogether, we underline the adaptive evolution of RBPs in angiosperms after WGDs during global cooling, improving our understanding of plants surviving periods of environmental turmoil.

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“…Contemporary hypotheses on the cause of the Cretaceous/Paleogene boundary (KPB) mass extinction event emphasize an abrupt loss of primary productivity at the KPB associated with a severe, long-lasting impact winter caused by sulfate and other stratospheric aerosols produced by the Chicxulub asteroid impact in the Yucatán Peninsula (Junium et al, 2022;Morgan et al, 2022). Although previous paleobotanical investigations emphasized a rather mild KPB impact winter associated with selection for deciduousness or other fast-return leaf economic strategies (Wolfe and Upchurch, 1987;Blonder et al, 2014), this hypothesis lacks critical empirical support in recent investigations (Berry, 2020;Butrim et al, 2022).…”

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confidence: 99%

Did selection for seed traits across the Cretaceous/Paleogene boundary sort plants based on ploidy?

Berry¹,

Jaganathan²

2022

Acta Palaeobot.

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Paleobotanists debate whether the Cretaceous/Paleogene boundary (KPB) event was selective. As the hypothesis that the KPB event selected for plants with fast-return leaf economic traits (e.g. deciduousness) has lost empirical support in recent investigations, researchers have turned to alternative hypotheses to explain an abrupt decline in primary productivity across the KPB. Two contemporary hypotheses designed to explain selectivity among plants across the KPB are that (1) polyploids exhibited greater survivorship than their diploid progenitors or counterparts (i.e. the KPB-whole genome duplication or WGD hypothesis) and that (2) plants with desiccation-tolerant (DT), i.e. orthodox, seeds exhibited greater survivorship than plants with desiccationsensitive (DS), also known as recalcitrant, seeds. Late embryogenesis abundant (LEA) protein gene families are perceived to confer DT and seed longevity among vascular plants. Non-parametric Wilcoxon signed-rank test for matched pairs and a Mann-Whitney U test reveal that plant lineages perceived to have undergone WGD across the KPB exhibit significantly greater numbers of LEA genes than those that did not. On the basis of these data, this investigation elicits a merger between the KPB-WGD and KPB-seed traits concepts. However, emphasis is shifted from the concept of WGD as an immediate adaptation to climatic stress at the KPB (the KPB-WGD hypothesis) to the concept that WGD was an exaptation, which, by definition, fortuitously enhanced the survival of vascular plants across the KPB but that probably evolved initially in other climatic contexts.

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Massive perturbations to atmospheric sulfur in the aftermath of the Chicxulub impact

Cited by 11 publications

References 68 publications

Toward the Origins of Quadruple Sulfur Isotope Anomalies in Modern Sulfate: A Multitracer Approach and Implications for Paleo- and Planetary Atmospheres

Toward the Origins of Quadruple Sulfur Isotope Anomalies in Modern Sulfate: A Multitracer Approach and Implications for Paleo- and Planetary Atmospheres

Convergent and/or parallel evolution of RNA‐binding proteins in angiosperms after polyploidization

Did selection for seed traits across the Cretaceous/Paleogene boundary sort plants based on ploidy?

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