Formation of sedimentary bedding couplets in the Western Interior Seaway of North America—implications from climate system modeling

Floegel, S.; Hay, William W.; DeConto, Robert M.; Balukhovsky, A.N.

doi:10.1016/j.palaeo.2004.12.011

Cited by 42 publications

(16 citation statements)

References 41 publications

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“…Under constant insolation values, the two strongest driving forces of this type of gyre circulation are the surface runoff and meridional temperature gradient (Kump and Slingerland, 1999). Changes in the amount of surface runoff during the precession cycle (Fl€ ogel et al, 2005) and/or changes in insolation (Glancy et al, 1993) may have significantly affected climate and the sedimentation patterns in the WIS. The Slingerland et al (1996) model explains the mechanism by which the Tethyan watermass advanced into the seaway, but fails to produce widespread organic-rich strata or water-column stratification (Fisher, 2003).…”

Section: Bridge Creek Rhythmic Bedding and Paleoceanographymentioning

confidence: 99%

“…The dilution model is based on wetedry cycles of increased and decreased detrital input to the basin to account for shale and limestone deposition, respectively (Fig. 3;Pratt, 1984;Barron et al, 1985;Watkins, 1985Watkins, , 1989Fl€ ogel et al, 2005). The productivity model, by contrast, posits that increased or decreased carbonate production at the surface of the ocean was primarily responsible for the carbonate-rich or carbonate-poor beds (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Paleocirculation and foraminiferal assemblages of the Cenomanian–Turonian Bridge Creek Limestone bedding couplets: Productivity vs. dilution during OAE2

Elderbak

Leckie

2016

Cretaceous Research

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Section: Bridge Creek Rhythmic Bedding and Paleoceanographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paleocirculation and foraminiferal assemblages of the Cenomanian–Turonian Bridge Creek Limestone bedding couplets: Productivity vs. dilution during OAE2

Elderbak

Leckie

2016

Cretaceous Research

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“…A mounting body of evidence indicates that precession and eccentricity cycles were manifested in P. X. Wang et al: The global monsoon across timescales paleomonsoon archives throughout the Phanerozoic. For example, the magnetic susceptibility record has been used to indicate the precession and semi-precession cycles of monsoon precipitation in Devonian limestone (De Vleeschouwer et al, 2012); geochemical and lithological analyses of clay lake deposits reveal precession, obliquity and eccentricity cycles in Triassic monsoon precipitation (Vollmer et al, 2008); and Cretaceous limestone and marlstone couplets have been shown to indicate precessional rhythms of monsoon-related hydrological cycling (Floegel et al, 2005). Although a global vision of the Pre-Quaternary paleomonsoon is hampered in most cases by a scarcity of data, the orbital forcing in monsoon variations is widely documented.…”

Section: Eccentricity Modulationmentioning

confidence: 99%

“…Aspects of the Silurian monsoon have been inferred from paleoceanographic reconstructions (Wilde et al, 1991), and the variability of the middle Devoian monsoon climate has been reconstructed using magnetic susceptibility records (De Vleeschouwer et al, 2012). For the late Mesozoic, the monsoon-driven reversal of surface tropical currents in the Cretaceous Tethys Seaway has been simulated in models (Bush, 1997), and middle Cretaceous limestone-marlstone couplets have been interpreted as arising from precessionforced variability in monsoon precipitation (Floegel et al, 2005).…”

Section: Pre-quaternary Monsoonmentioning

confidence: 99%

The global monsoon across timescales: coherent variability of regional monsoons

et al. 2014

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Abstract. Monsoon has earned increasing attention from the climate community since the last century, yet only recently have regional monsoons been recognized as a global system. It remains a debated issue, however, as to what extent and at which timescales the global monsoon can be viewed as a major mode of climate variability. For this purpose, a PAGES (Past Global Changes) working group (WG) was set up to investigate the concept of the global monsoon and its future research directions. The WG's synthesis is presented here. On the basis of observation and proxy data, the WG found that the regional monsoons can vary coherently, although not perfectly, at various timescales, varying between interannual, interdecadal, centennial, millennial, orbital and tectonic timescales, conforming to the global monsoon concept across timescales. Within the global monsoon system, each subsystem has its own features, depending on its geographic and topographic conditions. Discrimination between global and regional components in the monsoon system is a key to revealing the driving factors in monsoon variations; hence, the global monsoon concept helps to enhance our understanding and to improve future projections of the regional monsoons. This paper starts with a historical review of the global monsoon concept in both modern and paleoclimatology, and an assessment of monsoon proxies used in regional and global scales. The main body of the paper is devoted to a summary of observation data at various timescales, providing evidence of the coherent global monsoon system. The paper concludes with a projection of future monsoon shifts in a warming world. The synthesis will be followed by a companion paper addressing driving mechanisms and outstanding issues in global monsoon studies.

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“…1. Wind stress is taken from a GEN-ESIS model simulation described in Floegel et al (2005), with identical continental configuration and elevated CO 2 . The present model differs from that in Sijp et al (2014) in terms of the cloud albedo.…”

Section: Model and Experimental Designmentioning

confidence: 99%

The effect of low ancient greenhouse climate temperature gradients on the ocean's overturning circulation

Sijp

England

2016

Clim. Past

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Abstract. We examine whether the reduced meridional temperature gradients of past greenhouse climates might have reduced oceanic overturning, leading to a more quiescent subsurface ocean. A substantial reduction of the pole-toEquator temperature difference is achieved in a coupled climate model via an altered radiative balance in the atmosphere. Contrary to expectations, we find that the meridional overturning circulation and deep ocean kinetic energy remain relatively unaffected. Reducing the wind strength also has remarkably little effect on the overturning. Instead, overturning strength depends on deep ocean density gradients, which remain relatively unaffected by the surface changes, despite an overall decrease in ocean density. Ocean poleward heat transport is significantly reduced only in the Northern Hemisphere, as now the circulation operates across a reduced temperature gradient, suggesting a sensitivity of Northern Hemisphere heat transport in greenhouse climates to the overturning circulation. These results indicate that climate models of the greenhouse climate during the Cretaceous and early Paleogene may yield a reasonable overturning circulation, despite failing to fully reproduce the extremely reduced temperature gradients of those time periods.

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Formation of sedimentary bedding couplets in the Western Interior Seaway of North America—implications from climate system modeling

Cited by 42 publications

References 41 publications

Paleocirculation and foraminiferal assemblages of the Cenomanian–Turonian Bridge Creek Limestone bedding couplets: Productivity vs. dilution during OAE2

Paleocirculation and foraminiferal assemblages of the Cenomanian–Turonian Bridge Creek Limestone bedding couplets: Productivity vs. dilution during OAE2

The global monsoon across timescales: coherent variability of regional monsoons

The effect of low ancient greenhouse climate temperature gradients on the ocean's overturning circulation

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