Tine Rasmussen

Tine Rasmussen
UiT The Arctic University of Norway

About

25
Publications
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Introduction
Skills and Expertise

Publications

Publications (25)
Article
Full-text available
The production of high-salinity brines during sea-ice freezing in circum-arctic coastal polynyas is thought to be part of northern deep water formation as it supplies additional dense waters to the Atlantic meridional overturning circulation system. To better predict the effect of possible future summer ice-free conditions in the Arctic Ocean on gl...
Data
In the light of rapidly diminishing sea ice cover in the Arctic during the present atmospheric warming, it is imperative to study the distribution of sea ice in the past in relation to rapid climate change. Here we focus on glacial millennial scale climatic events (Dansgaard/Oeschger events) using the new sea ice proxy IP25 in combination with phyt...
Article
Full-text available
Palaeo-bottom current strength of the West Spitsbergen Current (WSC) and the influence of the Svalbard-Barents Sea Ice Sheet (SBIS) on the depositional environment along the northern Svalbard margins are poorly known. Two gravity cores from the southern Yermak Plateau and the upper slope north of Nordaustlandet, covering marine isotope stage (MIS)...
Article
We investigated gravity core HH11-09GC from 488 m water depth at the northern Svalbard margin in order to reconstruct changes in Atlantic Water (AW) inflow to the Arctic Ocean. The study was based on the distribution patterns of benthic and planktic foraminifera, benthic and planktic oxygen and carbon isotopes, lithology and physical properties of...
Data
The Last Interglacial (LIG, 129-116 thousand of years BP, ka) represents a test bed for climate model feedbacks in warmer-than-present high latitude regions. However, mainly because aligning different palaeoclimatic archives and from different parts of the world is not trivial, a spatio-temporal picture of LIG temperature changes is difficult to ob...
Article
Full-text available
The deep-sea environment is among the most stable on Earth, making it well suited for amino acid geochronology. Foraminifera with calcareous tests are distributed across the World Ocean and are often recovered in sufficient abundance from sediment cores to derive robust mean amino acid D/L values of multiple replicates from each stratigraphic level...
Article
We study an arctic sediment drift in ~1200 m water depth at Vestnesa Ridge, offshore western Svalbard. The ridge is spotted with pockmarks that range in size from a few meters to hundreds of meters in diameter and centimeters to tens of meters in height (e.g. Vogt et al., 1994). There is a strong negative-polarity seismic reflection below the ridge...
Article
A deep-sea sediment core covering the last 20 ka and located between the Polar and the Arctic fronts in the mar-ginal ice zone (MIZ) of the central Fram Strait has been investigated for changes in paleoceanography and calcium carbonate preservation. The reconstruction is based on the distribution patterns of planktic foraminifera, mean shell weight...
Article
The origin of two acoustic sediment units has been studied based on lithological facies, chronology and benthic stable isotope values as well as on foraminifera and clay mineral assemblages in six marine sediment cores from Kveithola, a small trough west of Spitsbergenbanken on the western Barents Sea margin. We have identified four time slices wit...
Article
We present a high-resolution study of planktic foraminiferal distribution patterns in a deep sea core from the eastern Fram Strait (position 78° 55′ N; 06° 46′ E; water depth 1497 m). The sediment core is located below Atlantic water masses flowing into the Arctic Ocean and spans the last 2400 years. The investigation is based on planktic foraminif...
Data
The origin of two acoustic sediment units has been studied based on lithological facies, chronology and benthic stable isotope values as well as on foraminifera and clay mineral assemblages in six marine sediment cores from Kveithola, a small trough west of Spitsbergenbanken on the western Barents Sea margin. We have identified four time slices wit...
Article
Ocean circulation changes along the continental shelf of the Nordic and Barents Seas have been investigated in order to reconstruct regional changes in the inflow of Atlantic Water (AW) through the last 16,000 calibrated (cal) years (yr) B.P. We have selected five time-slices representing the late glacial (16,000–15,000 cal yr B.P.), the Bølling-Al...
Article
The distribution patterns of benthonic and planktonic foraminifera in cores from the Ionian Basin, central Mediterranean, were investigated in relation to the deposition of sapropel S-1. The sapropel is a dark organic-rich sediment deposited under anoxic conditions during the last marine stagnation in the Early Holocene. The major divisions between...
Data
Ocean circulation changes along the continental shelf of the Nordic and Barents Seas have been investigated in order to reconstruct regional changes in the inflow of Atlantic Water (AW) through the last 16,000 calibrated (cal) years (yr) B.P. We have selected five time-slices representing the late glacial (16,000-15,000 cal yr B.P.), the Bølling-Al...
Data
A number of short-lasting warm periods (interstadials) interrupted the otherwise cold climate of the last glacial period. These events are supposedly linked to the inflow of the warm Atlantic surface water to the Nordic seas. However, previous investigations of planktonic foraminifera from the Nordic seas have not been able to resolve any significa...
Article
Paleomagnetic records based on multiple sediment cores from the Arctic Ocean and Greenland Seas (e.g. Nowaczyk et al. 2003 Geophys. J. Int. 155) have suggested that several Late Quaternary geomagnetic excursions took place in this region, with the possibility of two excursions with calibrated radiocarbon ages younger than Laschamp (~40ka). During a...
Article
The changes in flow and character of the warm Atlantic Water through the last 17,500 cal yr are reconstructed from the distribution of benthic foraminifera species, planktonic and benthic foraminifera abundances, stable oxygen isotopes and lithology in two cores from the western and northern shelf of Svalbard. The results show almost continuous pre...
Article
Full-text available
1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding w...
Data
Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding with...
Article
Oxygen isotope,magnetic susceptibility and foraminiferal distribution data are presented for a high resolution core (ENAM93-21) located at the northeast Faeroe Margin. This core recorded a rapid succession of faunistic, sedimentologic and isotopic variations which paralleled the Greenland ice core isotopic records with their typical succession of a...
Article
On the basis of synchronization of three carbon-14 (14C)-dated lacustrine sequences from Sweden with tree ring and ice core records, the absolute age of the Younger Dryas-Preboreal climatic shift was determined to be 11,450 to 11,390 ± 80 years before the present. A 150-year-long cooling in the early Preboreal, associated with rising Δ14C values, i...
Data
A high-resolution piston core, ENAM93-21, from a water depth of 1020 m near the Faeroe-Shetland Channel is investigated for variations in magnetic susceptibility, surface oxygen isotopes, grain size distribution, content of ice-rafted detritus (IRD), and distribution of planktonic and benthic foraminifera. The core, covering the last 58,000 years,...

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Project (1)
Project
www.nansenlegacy.org The Barents Sea is an Atlantic Water gateway to the Arctic Basin, at the same time as it is at the receiving end of sea ice export from the Arctic Ocean. Large-scale patterns of Arctic climate change are largely present, or even enhanced, in the Barents Sea. Increased heat transport with Atlantic Water has caused up to 50% reduction in sea ice cover in the 1998–2008 period and an increased “atlantification” of the northern parts of the Barents Sea, with weaker stratification of the water column and shallower distribution of the warmer Atlantic water. These changes in the physical environment transfer to the living environment, reflected in changed distribution and composition of species and communities. Much of our older knowledge and understanding of the structure and function of the northern Barents Sea ecosystem and adjacent Arctic Basin is therefore no longer automatically applicable. Further, increased human presence and commercial activities in the formerly ice-covered areas of the Barents Sea require updated and new knowledge on this changing Arctic ecosystem. The Nansen Legacy constitutes an integrated Arctic perspective on climate and ecosystem change, from physical processes to living resources, and from understanding the past to predicting the future. The Nansen Legacy is the collective answer of the Norwegian research community to the outstanding changes witnessed in the Barents Sea and the Arctic as a whole. The Nansen Legacy constitutes a joint Norwegian research platform to address the following over-arching objectives: Improve the scientific basis for sustainable management of natural resources beyond the present ice edge Characterize the main human impacts, physical drivers, and intrinsic operation of the changing Barents Sea ecosystems – past, present, and future Explore and exploit the prognostic mechanisms governing weather, climate and ecosystem, including predictive capabilities and constraining uncertainties Optimize the use of emerging technologies, logistic capabilities, research recruitment and stakeholder interaction to explore and manage the emerging Arctic Ocean. The Nansen Legacy will provide a 2020–2100 outlook for the expected state of climate, sea ice, and ecosystem, including near-term predictions. It will evaluate the sensitivity and functionality of early-warning indicators used to detect change in marine resources and their vulnerability to exploitation. Further, the project will largely improve polar weather forecasts for the safety of people and commercial operations. Another core legacy will be the recruitment and training of the next generation of trained cross-disciplinary researchers, with a unique national and international network. Overall, the legacy and societal impact will be the scientific knowledge base needed for sustainable resource management in the transitional Barents Sea and adjacent Arctic Basin. The scientific investigation of a rapidly changing northern environment leads to research questions of such intellectual, empirical and logistical complexity that they can only be addressed properly through national and prioritized cooperation, with the highest scientific standards. The Nansen Legacy team is purposefully interdisciplinary including physical, chemical, and biological researchers from eight governmental Norwegian institutions, and two private research institutes. The institutions include universities, management oriented institutions, the national weather service, and research institutes with close collaboration with industrial partners. The joint effort offers a human capacity of 3590 person months, corresponding to 50 full time positions of dedicated scientists and support staff over a 6-year period. Moreover, the Nansen Legacy dispenses over 370 days of ship time, primarily on the newly launched Norwegian ice-going research vessel, Kronprins Haakon, which allows for collecting unique, synoptic and interdisciplinary seasonal and inter-annual time series data. The Nansen Legacy field component uses a combination of ship-based, moored, and autonomous technological platforms. To increase high-resolution observational capabilities leading to an increase in future forecast reliability, the Nansen Legacy will develop, test and apply novel advanced technologies in ice-covered regions. International cooperation is an absolute requirement for holistic research and management in the High North. The Nansen Legacy will contribute to international research and a comprehensive pan-Arctic understanding. Fridtjof Nansen overcame scientific and physical boundaries by challenging conventions, being unconstrained in his approach to science and to exploring nature in the field, and making full use of available human and logistical resources. In the spirit of Nansen, the Nansen Legacy will collaborate with relevant national and international research projects and initiatives to utilize complementary knowledge, share infrastructure, increase the scientific outcome and strengthen science networks.