scholarly journals Deciphering the Palaeocene–Eocene thermal maximum by Granger causality test

2021 ◽  
Author(s):  
Zeyang Liu ◽  
Xiehua Ji ◽  
Wenyan Luo ◽  
Yujie Hu ◽  
Haoran Liu
Keyword(s):  
Global Warming ◽  
Carbon Emission ◽  
Causality Test ◽  
Environmental Perturbations ◽  
Causal Direction ◽  
Carbon Isotope Excursion ◽  
Initial Carbon ◽  
Thermal Maximum ◽  
Carbon Injection ◽  
Permafrost Thawing

Abstract The Palaeocene–Eocene thermal maximum is a global warming period (~ 56 Ma), which is marked by a sharp negative carbon isotope excursion (CIE) that caused by the injection of massive isotopically-light carbon into the ocean-atmosphere. It is often considered that the carbon injection caused global warming. However, several studies have suggested that warming and environmental perturbations precede the onset of the CIE. Here we present Granger test to investigate the detailed mechanisms of this event. We show a shift from climate-warming driving carbon-emission scenario to a scheme in which carbon-injection causing global-warming during the CIE. The initial carbon emission might be from methane hydrates dissociation and/or permafrost thawing, possibly linked with astronomical paced warming. This change of causal direction may result from the warming feedback of the emitted carbon and additional carbon from other sources, such as volcanism, bolide impact, oxidation of marine organic matter, and wildfires burning peatlands.

Stratigraphic and sedimentological aspects of the worldwide distribution of Apectodinium in Paleocene/Eocene Thermal Maximum deposits

2021 ◽  
pp. SP511-2020-46
Author(s):  
Christopher N. Denison
Keyword(s):  
Global Warming ◽  
Sea Level ◽  
Environmental Changes ◽  
Calcareous Nannofossil ◽  
Shallow Marine ◽  
Worldwide Distribution ◽  
Carbon Isotope Excursion ◽  
Thermal Maximum ◽  
Taxonomic Changes ◽  
Data Gap

AbstractThe Paleocene/Eocene Thermal Maximum (PETM) is characterized by pronounced global warming and associated environmental changes. In the more-or-less two decades since prior regional syntheses of Apectodinium distribution at the PETM, extensive biological and geochemical datasets have elucidated the effect of rising world temperatures on climate and the biome. A Carbon Isotope Excursion (CIE) that marks the Paleocene/Eocene Boundary (PEB) is associated with an acme of marine dinocysts of the genus Apectodinium in many locations. Distinctive foraminiferal and calcareous nannofossil populations may also be present.For this up-dated, dinocyst-oriented view of the PETM, data from worldwide locations have been evaluated with an emphasis on stratigraphic and sedimentological context. What has emerged is that a change in lithology is common, often to a distinctive siltstone or claystone unit, which contrasts with underlying and overlying lithotypes. This change, present in shallow marine/coastal settings and in deepwater turbidite deposits, is attributed to radical modifications of precipitation and erosional processes. An abrupt boundary carries the implication that some time (of unknowable duration) is potentially missing, which then requires caution in the interpretation of the pacing of events in relation to that boundary. In most instances an ‘abrupt’ or ‘rapid’ CIE onset can be attributed to a data gap at a hiatus, particularly in shallow shelf settings where transgression resulted from sea-level rise associated with the PETM. Truly gradational lower boundaries of the PETM interval are quite unusual, and if present, are poorly known so far. Gradational upper boundaries are more common, but erosional upper boundaries have been reported.Taxonomic changes have been made to clarify identification issues that have adversely impacted some biostratigraphic interpretations. Apectodinium hyperacanthum has been retained in Wetzeliella, its original genus. The majority of specimens previously assigned to Apectodinium hyperacanthum or Wetzeliella (Apectodinium) hyperacanthum have been re-assigned to an informal species, Apectodinium sp. 1. Dracodinium astra has been retained in its original genus as Wetzeliella astra, and is emended.

scholarly journals Rapid carbon injection and transient global warming during the Paleocene-Eocene thermal maximum

2008 ◽  
Vol 87 (3) ◽  
pp. 201-206 ◽  
Author(s):  
A. Stuijs ◽  
H. Brinkhuis
Keyword(s):  
Global Warming ◽  
High Latitude ◽  
Elevated Temperatures ◽  
Hydrological Cycle ◽  
Warming Trend ◽  
Early Eocene ◽  
Biotic Response ◽  
Thermal Maximum ◽  
Carbon Injection

The Paleocene-Eocene Thermal Maximum (PETM), ~55.5 Myr ago, was a geologically brief (~170 kyr) episode of globally elevated temperatures, which occurred superimposed on the long-term late Paleocene and early Eocene warming trend (Fig. 1). It was marked by a 5 – 8° C warming in both low and high-latitude regions, a perturbation of the hydrological cycle and major biotic response on land and in the oceans, including radiations, extinctions and migrations (see overviews in Bowen et al., 2006; Sluijs et al., 2007a).

scholarly journals A seasonality trigger for carbon injection at the Paleocene-Eocene thermal maximum

2013 ◽  
Vol 9 (5) ◽  
pp. 5837-5854
Author(s):  
J. S. Eldrett ◽  
D. R. Greenwood ◽  
M. Polling ◽  
H. Brinkhuis ◽  
A. Sluijs
Keyword(s):  
Deep Ocean ◽  
Mean Annual Temperature ◽  
Ecological Change ◽  
Broadleaf Forest ◽  
Temperature Changes ◽  
Carbon Isotope Excursion ◽  
Thermal Maximum ◽  
Carbon Injection ◽  
Summer Temperatures ◽  
Central North Sea

Abstract. The Paleocene-Eocene thermal maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean-atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean waters warmed by ~5 °C, of which part may have occurred prior to the CIE. However, few records document continental climatic trends and changes in seasonality have not been documented. Here we present the first high-resolution vegetation reconstructions for the PETM, based on bioclimatic analysis of terrestrially-derived spore and pollen assemblages preserved in an expanded section from the Central North Sea. Our data indicate reductions in boreal conifers and an increase in mesothermal to megathermal taxa, reflecting a shift towards wetter and warmer climate. We also record an increase in summer temperatures, greater in magnitude than the rise in mean annual temperature changes. Within the CIE, vegetation varies significantly with initial increases in epiphytic and climbing ferns, and development of extensive wetlands, followed by abundance of Carya spp. indicative of broadleaf forest colonization. Critically, the change in vegetation we report occurs prior to the CIE, and is concomitant with anomalous marine ecological change, as represented by the occurrence of Apectodinium augustum. This suggests that amplifications of seasonal extremes triggered carbon injection.

scholarly journals A seasonality trigger for carbon injection at the Paleocene–Eocene Thermal Maximum

2014 ◽  
Vol 10 (2) ◽  
pp. 759-769 ◽  
Author(s):  
J. S. Eldrett ◽  
D. R. Greenwood ◽  
M. Polling ◽  
H. Brinkhuis ◽  
A. Sluijs
Keyword(s):  
Deep Ocean ◽  
Mean Annual Temperature ◽  
Ecological Change ◽  
Broadleaf Forest ◽  
Temperature Changes ◽  
Carbon Isotope Excursion ◽  
Thermal Maximum ◽  
Carbon Injection ◽  
Summer Temperatures ◽  
Central North Sea

Abstract. The Paleocene–Eocene Thermal Maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean–atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean waters warmed by ~5 °C, of which part may have occurred prior to the CIE. However, few records document continental climatic trends and changes in seasonality have not been documented. Here we present the first high-resolution vegetation and paleoclimate reconstructions for the PETM, based on nearest living relative analysis of terrestrially derived spore and pollen assemblages preserved in an expanded section from the central North Sea. Our data indicate reductions in boreal conifers and an increase in mesothermal to megathermal taxa, reflecting a shift towards wetter and warmer climate. We also record an increase in summer temperatures, greater in magnitude than the rise in mean annual temperature changes, and a shift to a summer-wet seasonality. Within the CIE, vegetation varies significantly with initial increases in epiphytic and climbing ferns, and development of extensive wetlands, followed by abundance of Carya spp. indicative of broadleaf forest colonization. Critically, the change in vegetation we report occurs prior to the CIE, and is concomitant with anomalous marine ecological change, as represented by the occurrence of Apectodinium augustum. This suggests that amplifications of seasonal extremes triggered carbon injection.

Calcium isotope composition of Morozovella over the late Paleocene–early Eocene

Geology ◽  
2021 ◽  
Author(s):  
Gabriella D. Kitch ◽  
Andrew D. Jacobson ◽  
Dustin T. Harper ◽  
Matthew T. Hurtgen ◽  
Bradley B. Sageman ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Calcium Isotope ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
Carbonate Ion ◽  
Kinetic Isotope ◽  
Carbon Isotope Excursion ◽  
Thermal Maximum ◽  
Igneous Province ◽  
North Atlantic Igneous Province

Ocean acidification (OA) during the Paleocene-Eocene thermal maximum (PETM) likely caused a biocalcification crisis. The calcium isotope composition (δ44/40Ca) of primary carbonate producers may be sensitive to OA. To test this hypothesis, we constructed the first high-resolution, high-precision planktic foraminiferal δ44/40Ca records before and across the PETM. The records employ specimens of Morozovella spp. collected from Ocean Drilling Program Sites 1209 (Shatsky Rise, Pacific Ocean) and 1263 (Walvis Ridge, Atlantic Ocean). At Site 1209, δ44/40Ca values start at –1.33‰ during the Upper Paleocene and increase to a peak of –1.15‰ immediately before the negative carbon isotope excursion (CIE) that marks the PETM onset. Values remain elevated through the PETM interval and decrease into the earliest Eocene. A shorter-term record for Site 1263 shows a similar trend, although δ44/40Ca values are on average 0.22‰ lower and decrease shortly after the CIE onset. The trends support neither diagenetic overprinting, authigenic carbonate additions, nor changes in the δ44/40Ca value of seawater. Rather, they are consistent with a kinetic isotope effect, whereby calcite δ44/40Ca values inversely correlate with precipitation rate. Geologically rapid Ca isotope shifts appear to reflect the response of Morozovella to globally forced changes in the local carbonate geochemistry of seawater. All data combined suggest that the PETM-OA event occurred near the peak of a gradual reduction in seawater carbonate ion concentrations during a time of elevated atmospheric pCO2, potentially driven by North Atlantic igneous province emplacement.

scholarly journals IMPACT OF TRADE OPENNESS ON ENVIRONMENT IN CHINA

2020 ◽  
Vol 21 (4) ◽  
pp. 1185-1202 ◽  
Author(s):  
Wen Jun ◽  
Hamid Mahmood ◽  
Muhammad Zakaria
Keyword(s):  
Carbon Emission ◽  
Trade Openness ◽  
Wavelet Coherence ◽  
Coherence Analysis ◽  
Pollution Haven Hypothesis ◽  
Causality Test ◽  
Pollution Haven ◽  
Analysis Phase ◽  
The Impact ◽  
Wavelet Coherence Analysis

The study investigates the impact of trade openness on pollution in China by applying wavelet-coherence analysis, phase-difference technique and Breitung and Candelon (2006) causality test. The estimated results provide some dynamic association between trade openness and pollutant variables. The results indicate that trade openness has increased pollution in China especially after 2001 when China became member of WTO. It suggests that “pollution haven hypothesis” exists in China. These results imply that trade openness has increased exports which has increased domestic production by increasing the scale of industries, which in turn has increased pollution in the country. The findings of spectral domain causality test show that trade openness causes carbon emission both in short, medium and long runs. It indicates that trade openness forecast carbon emissions in China. The results suggest that China should take suitable measures while following trade openness policy to avoid pollution.

scholarly journals THE EFFECT OF SAVING AND CAPITAL EXPANSION ON FINANCIAL AND TECHNOLOGICAL DEVELOPMENT IN GCC COUNTRIES

2021 ◽  
Vol 0 (0) ◽  
pp. 1-25
Author(s):  
Faris Alshubiri
Keyword(s):  
Least Squares ◽  
Financial Development ◽  
Technological Development ◽  
National Income ◽  
Ordinary Least Squares ◽  
Growth Strategy ◽  
Causality Test ◽  
Gcc Countries ◽  
Causal Direction ◽  
Long Run

This study examined the effect of the relationship between saving and capital expansion on financial and technological development in three GCC countries using panel data from 1990 to 2019. The study used panel least squares, feasible general least squares, dynamic ordinary least squares and fully modified ordinary least squares used in the study. The findings showed that there was a significant positive long-run relationship between capital expansion and financial development and was a positive and insignificant long-run relationship between saving and financial development. Conversely, the study showed that there was a significant positive long-run relationship between saving and technological development. Meanwhile, there was a negative long-run relationship between capital expansion and technological development. Pairwise Granger causality test results showed that there was bidirectional causality between saving and financial development, a single causal direction from Adjusted net national income and financial development and a single causal direction from technological development and saving and Inflation, consumer prices. The main conclusions of the study were saving tends to support technological development, while investment tends to improve financial development. Therefore, GCC countries should formulate a long-term growth strategy in all sectors to determine their development requirements in light of the available resources.

A Review of Alternative Economic Approaches to Achieve Sustainable Development

2022 ◽  
pp. 288-307
Author(s):  
Seda Yildirim ◽  
Isil Demirtas ◽  
Durmus Cagri Yildirim
Keyword(s):  
Sustainable Development ◽  
Global Warming ◽  
Business Model ◽  
Carbon Emission ◽  
Sustainable Development Goals ◽  
Business Models ◽  
Social Issues ◽  
Digital Economy ◽  
Development Goals

The COVID-19 pandemic has changed the progress in 2030 Sustainable Development Goals, and policymakers have been challenged with the implications of conventional economic system in the market. At this point, it can be said that the adoption of the best alternative economic and business model for the marketplace is the new phenomenon during the COVID-19 pandemic. Accordingly, alternative economic and business models can reduce the carbon emission, environmental pollution, and global warming, but there is a still dark point in solving social issues globally. This study aims to give a brief framework for alternative economic and business models in the context of sustainability. This study presents the links between 2030 Sustainable Development Goals, digital economy, and de-growth. In other words, this chapter focuses on digital economy (digitalization) and degrowth model (degrowing). Accordingly, it is thought to give an up-to-date work for achieving sustainable development after the COVID-19 pandemic in the long term.

RESPONSE OF CALCAREOUS NANNOPLANKTON TO PALEOCENE–EOCENE THERMAL MAXIMUM IN NORTHERN IRAQ

2020 ◽  
Vol 02 (01) ◽  
pp. 2050001
Author(s):  
RAGHDA SAAD AL-HYALY ◽  
OMAR AHMED AL-BADRANI
Keyword(s):  
Global Warming ◽  
Calcareous Nannofossils ◽  
Calcareous Nannoplankton ◽  
Geological Record ◽  
Northern Iraq ◽  
Thermal Maximum

The Paleocene–Eocene Thermal Maximum (PETM) was an abrupt global warming event in the geological record. Based on calcareous nannofossils from thirteen samples of Aaliji Formation from K-116 well, Northern Iraq, sixty species are identified and can be used to divide the studied section into five biozones. Especially, the transition in the Discoaster multiraditus Biozone (CP8) occurred which is marked by higher speciation for calcareous nannofossils and the occurrences of Discoaster Tan. Such atransition is closely related to global warming during the transition from Paleocene to Eocene.

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