Anomalous cold in the Pangaean tropics

Soreghan, Gerilyn S.; Soreghan, Michael J.; Poulsen, Christopher J.; Young, Roger A.; Eble, Cortland F.; Sweet, Dustin E.; Davogustto, Oswaldo

doi:10.1130/g24822a.1

Cited by 65 publications

(54 citation statements)

References 26 publications

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“…doi: 10. 1016/ j.palaeo.2014.09.013 presented for the Devonian (Brezinski et al, 2010) and also proposed for the Pennsylvanian in the Ancestral Rocky Mountains (Soreghan et al, 2008). Because of the shift of cool-water thermocline southwards along the Laurentia, the environment in the shelves t was similar to as in the mid-latitudes elsewhere in Boreal and Peri-Gondwanan provinces (Davydov and Arefifard, 2013; (Stevens, 1966(Stevens, , 1971).…”

Section: Temperate Environments In North American Shelves During Latementioning

confidence: 87%

Warm water benthic foraminifera document the Pennsylvanian–Permian warming and cooling events — The record from the Western Pangea tropical shelves

Davydov

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Temperate Environments In North American Shelves During Latementioning

confidence: 87%

Warm water benthic foraminifera document the Pennsylvanian–Permian warming and cooling events — The record from the Western Pangea tropical shelves

Davydov

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…If glaciation of the Central Pangaean Mountains occurred, it might affect tropical precipitation by acting as a cold trap for moisture, suppressing orographic convection, or changing the tropical circulation by displacing the maximum heating off the Equator as investigated by Lindzen and Hou (1988). However, models have yet to produce glaciation of the Central Pangaean Mountains (CPM), even under extremely low pCO 2 (Soreghan et al, 2008b).…”

Section: Accepted Manuscriptmentioning

confidence: 97%

A model-based evaluation of tropical climate in Pangaea during the late Palaeozoic icehouse

Heavens

Mahowald

Soreghan

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…These patterns of change in climate and ice volume appear to be strongly correlated with and probably driven by changes in atmospheric CO 2 concentration (Montañ ez and Poulsen 2013). Furthermore, there is evidence that the Pennsylvanian tropics at times, or perhaps at parts of glacial-interglacial cycles, may have been cooler than those of the modern world (Soreghan et al 2008;Tabor et al 2013a). These findings are in conformance with the surmise of Fredericksen (1972) that Pennsylvanian wetlands may have been cooler than generally envisioned.…”

Section: Tropical Cyclothems and Climate Cyclesmentioning

confidence: 99%

Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

DiMichele¹

2014

International Journal of Plant Sciences

158

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Premise of research. The Late Paleozoic Ice Age was the last extensive pre-Pleistocene ice age. It includes many climate changes of different intensities, permitting examination of many and varied biotic responses. The tropical Pennsylvanian Subperiod, usually visualized as one vast wetland coal forest, in fact also was dominated, periodically, by seasonally dry vegetation that, in turn, covered most of the central and western Pangean supercontinent. Equatorial wetland and dryland biomes oscillated during single glacial-interglacial cycles. This recognition changes understanding of the Coal Age tropics; examination of their spatiotemporal patterns indicates that these vegetation types responded differently to global environmental disturbances and long-term trends and points to potentially different underlying controls on evolutionary histories of their component lineages.Methodology. This study is based on the published literature and on examination of geological exposures and fossil floras, mainly from North America but also from other parts of the world.Pivotal results. Wetlands and seasonally dry habitats were equally part of the Coal Age Pangean tropics. They dominated these landscapes at different times, under different climatic regimes. Wetland vegetation was likely forced into refugia during seasonally dry (subhumid to semiarid) parts of glacial-interglacial cycles; it reemerged/reassembled during wet (humid to perhumid) periods. Seasonally dry vegetation resided permanently in areas of western and central Pangea and in microhabitats within the Central Pangean Mountains. Both floras had lower biodiversity than modern floras in similar habitats. The wetland flora species pool was more phylogenetically disparate than any modern vegetation. In contrast, seasonally dry floras were dominated by seed plants. These biomes responded differently to acute environmental changes and chronic long-term aridification.Conclusions. From ecological or evolutionary perspectives, the present-day world is but one possibility. Lower-diversity worlds such as the late Paleozoic, with a rich spectrum of environmental variations, offer insights into relationships between organisms and environments that expand understanding of these phenomena and enlarge our sense of what is possible or probable as we look to the future.

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Anomalous cold in the Pangaean tropics

Cited by 65 publications

References 26 publications

Warm water benthic foraminifera document the Pennsylvanian–Permian warming and cooling events — The record from the Western Pangea tropical shelves

Warm water benthic foraminifera document the Pennsylvanian–Permian warming and cooling events — The record from the Western Pangea tropical shelves

A model-based evaluation of tropical climate in Pangaea during the late Palaeozoic icehouse

Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

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