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.

Vegetation change in the Astrakhanskiy Biosphere Reserve (Lower Volga Delta, Russia) in relation to Caspian Sea level fluctuation

1999 ◽  
Vol 26 (3) ◽  
pp. 169-178 ◽  
Author(s):  
E.A. BALDINA ◽  
J. DE LEEUW ◽  
A.K. GORBUNOV ◽  
I.A. LABUTINA ◽  
A.F. ZHIVOGLIAD ◽  
...  
Keyword(s):  
Sea Level ◽  
Time Scales ◽  
Caspian Sea ◽  
Biosphere Reserve ◽  
Sea Level Change ◽  
Rapid Progression ◽  
Sea Level Changes ◽  
Volga Delta ◽  
Level Change ◽  
Lower Volga

During the twentieth century the level of the Caspian Sea dropped from -26 m (1930) to -29 m (1977) below global sea level and subsequently rose again to -26.66 m in 1996. We aimed to describe responses of the vegetation in the lower Volga Delta to these substantial sea-level changes using an analysis of historic vegetation maps produced by aerial photography and satellite imagery.The sea level drop in the earlier part of the century was followed by rapid progression of the vegetation. The subsequent rapid sea-level rise in the 1980s did however not result in similarly rapid regression of the vegetation. This partial irreversibility of the vegetation response to sea-level change is explained by the wide flooding tolerance of the major emergent species, namely Phragmites australis. Floating vegetation increased in extent, most likely due to the increased availability of more favourable conditions, particularly for Nelumbo nucifera, a tropical plant reaching its northernmost distribution in the Volga Delta. This species increased in distribution from 3.5 ha in the 1930s throughout the entire Volga Delta to several thousands of hectares in the Astrakhanskiy Biosphere Reserve alone in the 1980s. The reported sea-level changes swept the ecosystems in the Astrakhanskiy Biosphere Reserve back and forth within the Reserve boundaries. At longer time scales, ten-fold greater sea-level change has been reported. The ecosystems for which the Reserve is renowned might be pushed completely out of the Reserve under these conditions. We therefore question whether the current Reserve will be sufficiently large to guarantee conservation of the biota in the lower Volga Delta at longer time scales.

scholarly journals Reconstructing Past Sea Level Change to Understand the Future

Eos ◽  
2017 ◽  
Author(s):  
Elena Steponaitis ◽  
Anastasia Yanchilina ◽  
Heather Bervid
Keyword(s):  
Sea Level ◽  
Time Scales ◽  
Sea Level Change ◽  
Level Change ◽  
The Future ◽  
Mount Hood ◽  
Instrumental Records

PALSEA2 2016 Workshop: Sea-Level Budgets at Decadal to Millennial Time Scales to Bridge the Paleo and Instrumental Records; Mount Hood, Oregon, 19–21 September 2016

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

Regional patterns of observed sea level change: insights from a 1/4° global ocean/sea-ice hindcast

2008 ◽  
Vol 59 (3) ◽  
pp. 433-449 ◽  
Author(s):  
Alix Lombard ◽  
Gilles Garric ◽  
Thierry Penduff
Keyword(s):  
Sea Ice ◽  
Sea Level ◽  
Sea Level Change ◽  
Global Ocean ◽  
Regional Patterns ◽  
Level Change

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.

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