arctic ocean cores

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arctic ocean cores

Paleomagnetic Chronology of Arctic Ocean Sediment Cores ...

Chronologies of Arctic Ocean sediment cores are mainly based on interpretation of paleomagnetic inclination records. The first paleomagnetic chronology assigned zones with negative inclinations to polarity reversals (Steuerwald et al, 1968) because geomagnetic excursions at that time were a novel observation and had only been reported from lavas.

Paleoclimatology: The Ice Core Record

Dec 19, 2005· The ice core recovered from Vostok, Antarctica, records over 400,000 years of climate history. This interactive graph shows temperature measurements derived from the core. Temperatures equal to or greater than the recent average (gray line) delineate interglacial periods, while colder temperatures indicate ice ages.

Arctic Ocean - Core - MAFIADOC.COM

the highest net ice-production rates in the Arctic Ocean (KASSENS et al. 1999). The winter ice cover of the Laptev Sea is characterized by the occurrence of an approximately 1800 km long, narrow zone of open water (polynyas) on the midshelf (DETHLEFF et al. 1993, REIMNITZ et al. 1994).

Animals of the Arctic Ocean - Alaska Wilderness League

The Animals of the Arctic Ocean The vast area of the Arctic Ocean is home to numerous fish, mammals and birds. Due to the ice coverage on the Arctic Ocean, its animal inhabitants have adapted to be skilled both on ice and in open water. The Beaufort and Chukchi Seas, the Arctic waters north of Alaska, are sometimes known as

Arctic vs. Antarctic | National Snow and Ice Data Center

The Arctic is a semi-enclosed ocean, almost completely surrounded by land. As a result, the sea ice that forms in the Arctic is not as mobile as sea ice in the Antarctic. Although sea ice moves around the Arctic basin, it tends to stay in the cold Arctic waters.

Canadian Arctic sea ice reconstructed from bromine in the ...

Sep 21, 2016· Scientific Reports volume 6 ... suggesting complete coverage of the Arctic Ocean by multi-year sea ice. ... in the NEEM ice core to investigate Canadian Arctic …

An Arctic Ocean cold core eddy

light ice conditions throughout the Arctic Ocean favor the formation of such eddies and may contribute to enhanced ventilation of the halocline waters. 1. Introduction This paper discusses physical and chemical observations that were made during September 1997 of a cold core eddy in the Canada Basin of the Arctic Ocean.

Arctic Ocean - Wikipedia

The Arctic Ocean is the smallest and shallowest of the world's five major oceans. ... The final defined water mass in the Arctic Ocean is called Arctic Surface Water and is found from 150–200 metres (490–660 feet). ... ice and ocean cores going back 8,000 years to the last warm period or 125,000 during the last intraglacial period.

Climate of the Arctic - Wikipedia

The climate of the Arctic is characterized by long, cold winters and short, cool summers. There is a large amount of variability in climate across the Arctic, but all regions experience extremes of solar radiation in both summer and winter.

Paleoclimatology: A Record from the Deep

A Record from the Deep: Fossil Chemistry : The most valuable fossils found in sediment cores are from tiny animals with a calcium carbonate shell, called foraminifera. One species of foraminifera lives in the icy waters of the Arctic above Iceland and near Antarctica.

Revised magnetostratigraphies confirm low sedimentation ...

Revised magnetostratigraphies confirm low sedimentation rates in Arctic Ocean cores. Witte, William K.; Kent, Dennis V. The general lack of an age-diagnostic biostratigraphy in the Neogene sediments of the abyssal Arctic Ocean has emphasized the importance of magnetostratigraphy in providing chronostratigraphic control in these sediments.

Plastic trash rides ocean currents to the Arctic | Science ...

May 23, 2017· She's a deep-sea ecologist at the Alfred-Wegener-Institute Center for Polar and Ocean Research in Bremerhaven, Germany. The findings provide new evidence that there are spots in the Arctic where plastic piles up, she says. Researchers studying ice cores have also found extremely high levels of microplastics in Arctic sea ice, she observes.

Paleoceanographic Perspectives on Arctic Ocean Change

E. Osborne1, T. Cronin2, J. Farmer3 1NOAA Arctic Research Program, Office of Oceanic and Atmospheric Research, Silver Spring, MD, USA 2U.S. Geological Survey, Reston, VA, USA 3Princeton University - Department of Geosciences, Princeton, NJ, USA Highlights High-resolution Arctic paleo-reconstructions indicate that the magnitude and pace of the 21st century sea-ice decline and surface ocean ...

Arctic sea ice is an important temporal sink and means of ...

Apr 24, 2018· Thus even in remote regions such as the Arctic Ocean, certain MP indicate the presence of localized sources. ... lead to a rapid spreading of theses pollutants in the entire Arctic Ocean 15. Cores ...

How the Isthmus of Panama Put Ice in the Arctic – Woods ...

Mar 22, 2004· The principal engine of this global circulation, often called the Ocean Conveyor, is the difference in salt content between the Atlantic and Pacific Oceans. Before the Isthmus of Panama existed, Pacific surface waters flowed into the Atlantic. Their …

Mid- to Late Pleistocene Ice Drift in the Western Arctic ...

The provenance of ice-rafted debris (IRD) in four Arctic sediment cores implies that icebergs from the northwestern Laurentide ice sheets drifted across the western Arctic Ocean along the 180°–0° meridian toward Fram Strait during mid- to late Pleistocene deglaciations within the last 700,000 years.

Mid- to Late Pleistocene Ice Drift in the Western Arctic ...

The provenance of ice-rafted debris (IRD) in four Arctic sediment cores implies that icebergs from the northwestern Laurentide ice sheets drifted across the western Arctic Ocean along the 180°–0° meridian toward Fram Strait during mid- to late Pleistocene deglaciations within the last 700,000 years. This iceberg drift was different from the present-day Beaufort Gyre circulation and ...

Arctic | Definition, Climate, People, & Facts | Britannica.com

Arctic: Arctic, northernmost region of the Earth, centered on the North Pole and characterized by distinctively polar conditions of climate, plant and animal life, and other physical features. The term is derived from the Greek word arktos ('bear'), referring to the northern constellation of the Bear.

Revised Magnetostratigraphies Confirm Low Sedimentation ...

Arctic Ocean Cores WILLIAM K. WITTE AND DENNIS V. KENT Lamont-Doherty Geological Observatory and Department of Geological Sciences, Columbia University, Palisades. New York 10964 Received June 11, 1987 The general lack of an age-diagnostic biostratigraphy in …

Arctic-COLORS - Home

Arctic-COLORS (Arctic-COastal Land Ocean inteRactions) was considered in the scoping study funded by NASA's Ocean Biology and Biogeochemistry Program that, through a proposed field campaign, aims to improve understanding and prediction of land-ocean interactions in a rapidly changing Arctic coastal zone, and assess vulnerability, response, feedbacks and resilience of coastal ecosystems ...

Uncharted Territory on the Arctic Seafloor — Polar Oceans ...

Home » Polar Oceans » Uncharted Territory on the Arctic Seafloor ... Yellow stars mark the sites where sediment cores were taken from the bottom of the ocean. Depths are based on the International Bathymetric Chart of the Arctic Ocean (IBCAO, ). Image courtesy of Martin Jakobsson, Stockholm University.

Rapid Sea Level Rise in the Arctic Ocean May Alter Views ...

Oct 11, 2006· Knowledge of climate change and sea level rise in the Arctic Ocean has been limited because sediment cores collected from the floor of the Arctic Ocean have been taken from locations where sediment has accumulated only about one centimeter (less than one-half inch) every 1,000 years.

Record concentration of microplastics found in Arctic ...

Apr 24, 2018· Ice cores gathered across the Arctic Ocean reveal microplastics at concentrations two to three times higher than previously recorded. As sea ice melts with climate change, the plastic will be ...

Record concentration of microplastics found in Arctic ...

Apr 24, 2018· Record levels of microplastics have been found trapped inside sea ice floating in the Arctic. Ice cores gathered across the Arctic Ocean reveal microplastics at …

Sources and cycling of mercury in the paleo Arctic Ocean ...

Arctic Ocean sediment cores used in this study. We obtained samples from sediment cores collected at eight different locations across the Arctic Ocean Basin . These include Holocene-age multi-core surface samples (HOTRAX Expedition – ...

Mid- to Late Pleistocene Ice Drift in the Western Arctic ...

The western Arctic Ocean flux rates of ice-rafted sediment in the cores (0.9 to 2.4 g m – 2 year – 1) are lower than those under permanent ice in the East Greenland current (2.9 g m – 2 year – 1), but the Arctic Ocean core sediment is much coarser (11.8 to 21.7 weight % >63 μm on average) than sea ice sediment (0.3 to 1.9 weight %) .

Developing a Luminescence Geochronometer for Arctic Ocean ...

Project Description. The paleoceanographic and paleoclimatic history of the Arctic Ocean, especially during the last several hundred thousand years, remains largely unknown because of difficulties in numerical dating of sediment cores in the 30-800 ka (kyr) time range.