scholarly journals The relationship between sea-level change, soil formation and stress history of a very soft clay deposit

2019 ◽  
Vol 5 (3) ◽  
pp. 461-479 ◽  
Author(s):  
Fernando A.B. Danziger ◽  
◽  
Graziella M.F. Jannuzzi ◽  
Ian S.M. Martins ◽  
Keyword(s):  
Sea Level ◽  
Soft Clay ◽  
Soil Formation ◽  
Sea Level Change ◽  
Stress History ◽  
Clay Deposit ◽  
Level Change ◽  
History Of ◽  
The Relationship

Phanerozoic Oxygen

2017 ◽  
Author(s):  
Donald Eugene Canfield
Keyword(s):  
Oxygen Consumption ◽  
Organic Carbon ◽  
Sea Level ◽  
Time Scale ◽  
Atmospheric Oxygen ◽  
Sea Level Change ◽  
Oxygen Production ◽  
Level Change ◽  
History Of ◽  
Geologic Processes

This chapter discusses the modeling of the history of atmospheric oxygen. The most recently deposited sediments will also be the most prone to weathering through processes like sea-level change or uplift of the land. Thus, through rapid recycling, high rates of oxygen production through the burial of organic-rich sediments will quickly lead to high rates of oxygen consumption through the exposure of these organic-rich sediments to weathering. From a modeling perspective, rapid recycling helps to dampen oxygen changes. This is important because the fluxes of oxygen through the atmosphere during organic carbon and pyrite burial, and by weathering, are huge compared to the relatively small amounts of oxygen in the atmosphere. Thus, all of the oxygen in the present atmosphere is cycled through geologic processes of oxygen liberation (organic carbon and pyrite burial) and consumption (weathering) on a time scale of about 2 to 3 million years.

scholarly journals Improving the understanding of the influencing factors on sea level on various time scales based on wavelet coherence and partial wavelet coherence

2021 ◽  
Author(s):  
Chao Song ◽  
Xiaohong Chen ◽  
Wenjun Xia
Keyword(s):  
Sea Ice ◽  
Sea Level ◽  
Influencing Factors ◽  
Time Scales ◽  
Sea Level Change ◽  
Wavelet Coherence ◽  
Climate Indices ◽  
Climate Factors ◽  
Level Change ◽  
The Relationship

Abstract The relationship between sea level change and a single climate indicator has been widely discussed. Despite this, few studies focused on the relationship between monthly mean sea level (MMSL) and several key impact factors, including CO2 concentration, sea ice area, and sunspots, on various time scales. In addition, research on the independent relationship between climate factors and sea level on various time scales is lacking, especially when the dependence of climate factors on Niño 3.4 is excluded. Based on this, we use wavelet coherence (WC) and partial wavelet coherence (PWC) to establish a relationship between MMSL and its influencing factors. The WC results show that the influence of climate indices on MMSL has strong regional characteristics. Sunspots affect MMSL on a scale of more than 64 months. The influence of the sea ice area on MMSL in the northern hemisphere is opposite to that in the southern hemisphere. The PWC results show that after removing the influence of Niño 3.4, the significant coherent regions of the Pacific Decadal Oscillation (PDO), Dipole Mode Index (DMI), Atlantic Multidecadal Oscillation (AMO), and Southern Oscillation Index (SOI) decrease to varying degrees on different time scales in different regions, demonstrating the influence of Niño 3.4. Our work emphasizes the independent relationship between MMSL and its influencing factors on various time scales and the use of PWC and WC to describe this relationship. The study has important reference significance for selecting the best predictors of sea level change or climate systems.

History of the greenhouse effect

1990 ◽  
Vol 14 (1) ◽  
pp. 1-18 ◽  
Author(s):  
M.D.H. Jones ◽  
A. Henderson-Sellers
Keyword(s):  
Sea Level ◽  
Greenhouse Effect ◽  
Climate Models ◽  
Atmospheric Sciences ◽  
Level Change ◽  
Oceanic Response ◽  
New Directions ◽  
History Of ◽  
Increasing Temperature ◽  
The Relationship

The greenhouse effect is now commonly accepted by the scientific community, politicians and the general public. However, the misnomer 'greenhouse effect' has perpetuated, and there are a number of aspects of the effect which are poorly understood outside the atmospheric sciences. On such misconception is that greenhouse research is a recent phenomenon; another is that glasshouses are warmed by the same mechanism as lies at the heart of the greenhouse effect. This review traces the theory as far back as 1827, highlighting new directions and significant advances over that time. Four main themes can be discerned: 1) certain radiatively active gases are responsible for warming the planet ; 2) that humans can inadvertently influence this warming; 3) climate models are designed to permit prediction of the climatic changes in the atmospheric loadings of these gases but that they have not yet achieved this goal of prediction; and 4) many scenarios of changes, and especially of impact, are premised on relatively weak analysis. This latter point is illustrated by an examination of the relationship between increasing temperature and sea level change (the oceanic response to atmospheric warming). Current research suggests that sea-level rise is not likely to be as high as had previously been anticipated.

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