Related Experiment Video
Updated: Feb 22, 2026
06:10
Using Generative Art to Convey Past and Future Climate Transitions
Published on: March 31, 2023
1.5K
End-member modelling as a tool for climate reconstruction-An Eastern Mediterranean case study.
Sarah Beuscher1, Stefan Krüger1, Werner Ehrmann1
1Universität Leipzig, Institut für Geophysik und Geologie, Leipzig, Germany.
Plos One
|September 22, 2017
Summary
Sediment core analysis in the Eastern Mediterranean Sea reveals climate dynamics. End-member modeling of detrital input shows reduced Saharan dust during humid periods and enhanced fluvial input linked to Northern Hemisphere insolation.
Area of Science:
- Paleoceanography
- Climate Science
- Sedimentology
Background:
- The Eastern Mediterranean Sea receives terrigenous sediments, offering insights into past climate dynamics and transport processes.
- Sediment cores provide a historical archive of environmental changes in source regions like North Africa, Europe, and Asia Minor.
Purpose of the Study:
- To reconstruct climate variability in sediment source regions using a high-resolution sediment core dataset (M40/4_SL71) spanning approximately 180,000 years.
- To evaluate the effectiveness of end-member modeling as a tool for interpreting multidisciplinary sedimentological data.
Main Methods:
- Analysis of clay mineral composition, silt fraction grain size distribution, and major/trace element abundance from sediment core M40/4_SL71.
- Application of end-member modeling to sedimentological datasets to identify distinct provenance and sedimentary processes.
Main Results:
- End-member modeling identified three Saharan dust end members, five fluvial sediment end members, and one sapropel-associated end member.
- Enhanced Saharan dust export occurred during dry phases, with reduced export during African Humid Periods.
- Fluvial sediment input showed strong correlation with Northern Hemisphere insolation and increased during African Humid Periods.
Conclusions:
- End-member modeling is a valuable technique for interpreting complex, multidisciplinary sedimentological datasets.
- Sediment composition reflects significant climate-driven changes in dust and fluvial inputs to the Eastern Mediterranean Sea over the last 180,000 years.
More Related Videos
10:14Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities
Published on: October 25, 2024
4.2K
10:46A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
11.2K
Related Concept Videos
01:50Global Climate Change
29.2K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
29.2K
01:21Isochoric and Isobaric Processes
4.6K
A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only.
Suppose 1000 g of water is heated from 40...
Suppose 1000 g of water is heated from 40...
4.6K
01:12Modeling and Similitude
678
Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
678
01:21Isothermal Processes
5.1K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
5.1K
01:12Precipitation Processes
6.3K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
6.3K
01:03Precipitation Gravimetry
15.7K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
15.7K