Marine Sediments and Climate History
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Sedimentology, mineralogy and sedimentary geochemistry of the Late Quaternary sedimentary sequence of Gavkhoni Playa by looking at the paleoclimate
The sediments of the Playa Lake are sensitive indicators of local climates that any change in climate, hydrology, and sedimentary environment will cause changes in the physical and chemical properties of the sediments. These sediments create a valuable and important archive with high resolution to examine these changes in the past. One method of studying climate change during quaternary and oft...
متن کاملCapturing climate variability during our ancestors' earliest days.
C limate’s role in shaping the environmental and evolutionary history of our earliest ancestors remains an actively debated topic. In PNAS, Magill et al. (1, 2) present records of terrestrial habitat and hydroclimate variation and pacing from Olduvai Gorge sediments during a key interval of our ancestors’ divergence and dispersal approximately 2.0 Ma. Although there is general consensus that ec...
متن کاملAncient marine algae provides clues of climate change impact on today's microscopic ocean organisms
A study of ancient marine algae has found that climate change affected their growth and skeleton structure, which has potential significance for today’s equivalent microscopic organisms that play an important role in the world’s oceans. Coccolithophores, a type of marine algae, are prolific in the ocean today and have been for millions of years. These single-celled plankton produce calcite skel...
متن کاملRelease of multiple bubbles from cohesive sediments
[1] Methane is a strong greenhouse gas, and marine and wetland sediments constitute significant sources to the atmosphere. This flux is dominated by the release of bubbles, and quantitative prediction of this bubble flux has been elusive because of the lack of a mechanistic model. Our previous work has shown that sediments behave as elastic fracturing solids during bubble growth and rise. We no...
متن کاملTerrigenous Signals in Sediments of the Low-Latitude Atlantic - Indications to Environmental Variations during the Late Quaternary: Part II: Lithogenic Matter
The inorganic terrigenous fraction of marine sediments offers a great number of different and well established proxy parameters to investigate the development of Earth's climate. Our present knowledge on climate variability through time is based, to a large part, on these proxies. This study presents a synthesis of multidisciplinary investigations which have been applied to late Quaternary sedi...
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تاریخ انتشار 2005