Abstract The Southern Ocean has played a significant role in the global climate system during the geologic past, even in the presentday. For example, it has been proposed that primary production was higher and nutrient utilization in surface waters was more efficient in the glacial Southern Ocean than today, effectively lowering the glacial atmospheric CO2 concentration.

Distinct magnetic properties of marine sediments that record the Palaeocene–Eocene thermal max imum (PETM) have been suggested to be due to a bacterial magnetofossil signal that is linked to enhanced weathering conditions during the PETM.

It has been shown that the fluctuations of cosmogenic production rate, derived from the changes of 10 Be concentration in Greenland and Antarctic ice, explain mediumterm Δ 14 C variations in the ...

Aug 15, 2019· Rock magnetic analysis reveals that a stable remanence is carried mainly by singledomain (SD) biogenic magnetite and pseudoSD detrital magnetite and that concentration and grainsizerelated bulk magnetic parameters vary by a factor of 3, initially meeting a .

Jul 15, 2000· Interglacial exchange of cold North Atlantic deep water (NADW) for warm surface waters from the South Atlantic is essential for today's warm climate in northern Europe [11]. Switching on and off the Atlantic heat conveyor in the global ice age rhythm also modifies conditions in the deep ocean.

Jan 14, 2010· Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau. The ferrimagnetic minerals in the Ili loess are magnetite and maghemite, and the antiferromagnetic mineral is hematite; XRD analysis also identifies the presence of ilmenite. The ratio of maghemite is lower in the Ili loess than in the Chinese loess,...

Iron fertilization. This form of fertilization produces the world's largest marine habitats. Fertilization can also occur when weather carries wind blown dust long distances over the ocean, or ironrich minerals are carried into the ocean by glaciers, rivers and icebergs.

PDF | On Sep 1, 2012, Toshitsugu Yamazaki and others published Correction to "Origin of magnetic mineral concentration variation in the Southern Ocean"

Sel gris is generally grey, composed of large cubelike course crystals, and has a higher mineral concentration than fleur de sel (SF Fig. B). Traditional Hawaiian Salt Harvesting. Native Hawaiians used sea salt, pa'akai ("to solidify the sea"), to season and preserve food, for religious and ceremonial purposes, and as medicine.

Feb 01, 2017· Origin of magnetic mineral concentration variation in the Southern Ocean Yamazaki, T.; Ikehara, M. Distinguishing sediments from the Yangtze and .

Indeed, the strength of the ice dust/sediment magnetism correlations (r ~ ) provides a pragmatic basis for use of the sedimentary magnetic susceptibility records as a chronostratigraphic proxy, a boon in the carbonatefree deepsea sediments of the Southern Ocean.

Mineral concentrates from the dacite which formed in 1986 give KAr 'ages' from ± Ma (feldsparglass concentrate) to ± Ma (pyroxene concentrate). These .

macronutrients as those major elements that are believed to be limiting to plant growth in the surface ocean. They have typical concentrations in the range of micromoles kg1. Phosphorus, nitrate and silica are the important macronutrients.

In the Southern Ocean, magnetic mineral concentration increases in glacial periods. The variation pattern closely resembles eolian dust flux records from Antarctic ice cores, but the cause of the linkage was unclear, as the dust flux is too small for the source of terrigenous materials in the Southern Ocean.

Jun 01, 2012· Read "Magnetotactic bacterial response to Antarctic dust supply during the Palaeocene–Eocene thermal maximum, Earth and Planetary Science Letters" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at .

enriched in D and 18O. At equilibrium, atmospheric vapour contains 10 ‰ less 18O and 100 ‰ less D than mean ocean water. Condensation: HDO and H218O pass more readily from vapour to liquid state. Compared to the remaining vapour, precipitation is enriched in the heavy isotopes.

The Southern Ocean, also known as the Antarctic Ocean or the Austral Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica. As such, it is regarded as the fourth largest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian Oceans but larger than the Arctic Ocean. This oceanic zone is where .

mate proxies drawn from a widespread area around the globe. Climatic proxies used represent variation in the North Atlantic Ocean, Western Pacific Warm Pool, Southern Ocean and the East Asian monsoon regions. Our wavelet analysis identifies fundamental solar modes at 2300yr (Hallstattzeit), 1000yr (Eddy), and 500yr

Distinct magnetic properties of marine sediments that record the Palaeocene Eocene thermal max imum (PETM) have been suggested to be due to a bacterial magnetofossil signal that is linked to enhanced weathering conditions during the PETM.

Origin of magnetic mineral concentration variation in the Southern Ocean Toshitsugu Yamazaki and Minoru Ikehara Article first published online: 24 APR 2012 | DOI: /2011PA002271