Radiolarian-based bransfer function for the estimation of sea surface temperatures in the Southern Ocean (Atlantic Sector)

A new radiolarian-based transfer function for sea surface temperature (SST) estimations has been developed from 23 taxa and taxa groups in 53 surface sediment samples recovered between 35° and 72°S in the Atlantic sector of the Southern Ocean. For the selection of taxa and taxa groups ecological information from water column studies was considered. The transfer function allows the estimation of austral summer SST (December-March) ranging between -1 and 18°C with a standard error of estimate of 1.2°C. SST estimates from selected late Pleistocene squences were sucessfully compared with independend paleotemperature estimates derived from a diatom transfer function. This shows that radiolarians provide an excellent tool for paleotemperature reconstructions in Pleistocene sediments of the Southern Ocean.

The young Shetlander and his home /

A biography of Thomas Edmondston, to which is prefixed a description of the Shetland Islands.

The history of the condition of women : in various ages and nations /

v. 1. Comprising the women of Asia and Africa -- v. 2. Comprising the women of Europe, America, and South Sea Islands.

Biogeographic analysis of jurassic-early cretaceous wood assemblages from Gondwana

The terrestrial biogeography of Gondwana during Jurassic-Early Cretaceous times is poorly resolved, and the flora is usually considered to have been rather uniform. This is surprising given the size of Gondwana, which extended from the equator to the South Pole. Documenting Gondwanan terrestrial floristic provincialism in the Jurassic-Early Cretaceous times is important because it provides a historical biogeographic context in which to understand the tremendous evolutionary radiations that occurred during the mid-Cretaceous. In this paper, the distribution of Jurassic-Early Cretaceous fossil wood is analysed at generic level across the entire supercontinent. Specifically, wood assemblages are analyzed in terms of five climatic zones (summer wet, desert, winter wet, warm temperate, cool temperate) established on the basis of independent data. Results demonstrate that araucarian-like conifer wood was a dominant, cosmopolitan element, whereas other taxa showed a greater degree of provincialism. Indeed, several narrowly endemic morphogenera are recognizable from the data. Finally, comparisons with Laurasian wood assemblages indicate strong parallelism between the vegetation of both hemispheres. (C) 2004 Elsevier B.V. All rights reserved.

Understanding Isolation and Change in Island Human Populations through a study of Indigenous Cultural Patterns in the Gulf of Carpentaria

This paper presents a set of hypotheses to explain the cultural differences between Aboriginal people of the North and South Wellesley Islands, Gulf of Carpentaria and to characterise the relative degree and nature of their isolation and cultural change over a 10,000-year time-scale. This opportunity to study parallelisms and divergences in the cultural and demographic histories of fisher-hunter-gatherers arises from the comparison of three distinct cultural groupings: (a) the Ganggalida of the mainland, (b) the Lardil and Yangkaal of the North Wellesley Islands, and (c) the Kaiadilt of the South Wellesley Islands. Despite occupying similar island environments and despite their languages being as closely related as for example, the West Germanic languages, there are some major differences in cultural, economic and social organization as well as striking genetic differences between the North and South Wellesley populations. This paper synthesizes data from linguistics, anthropology, archaeology, genetics and environmental science to present hypotheses of how these intriguing differences were generated, and what we might learn about early processes of marine colonization and cultural change from the Wellesley situation.

Global compilation of benthic data sets I

Approaches to quantify the organic carbon accumulation on a global scale generally do not consider the small-scale variability of sedimentary and oceanographic boundary conditions along continental margins. In this study, we present a new approach to regionalize the total organic carbon (TOC) content in surface sediments (<5 cm sediment depth). It is based on a compilation of more than 5500 single measurements from various sources. Global TOC distribution was determined by the application of a combined qualitative and quantitative-geostatistical method. Overall, 33 benthic TOC-based provinces were defined and used to process the global distribution pattern of the TOC content in surface sediments in a 1°x1° grid resolution. Regional dependencies of data points within each single province are expressed by modeled semi-variograms. Measured and estimated TOC values show good correlation, emphasizing the reasonable applicability of the method. The accumulation of organic carbon in marine surface sediments is a key parameter in the control of mineralization processes and the material exchange between the sediment and the ocean water. Our approach will help to improve global budgets of nutrient and carbon cycles.

Geochemistry of Southern Ocean sediments

Reconstructing past detrital flux and provenance in the Southern Ocean provides information about changes in source regions associated with climate variations and transport pathways. We present a Last Glacial Maximum (LGM) to Holocene comparison of 230Th normalised fluxes combined with sediment provenance data (Pb, Nd and Sr isotopes) from a latitudinal core transect in the eastern Atlantic sector of the Southern Ocean (ODP Leg 177 cores). We compare the radiogenic isotopic composition (IC) of detritus in these cores to that of cores proximal to potential source areas. We observe a well-defined latitudinal Holocene gradient in both detrital flux and provenance of sediment. High detrital fluxes in the north are associated with terrigenous material derived from southern Africa, while low detrital fluxes in the south are associated with supply from southern South America, West Antarctica and the South Sandwich Islands. The data suggest that this well-defined Holocene gradient in detrital flux and sediment provenance is controlled by the flow of the Antarctic Circumpolar Current (ACC) and the position of its frontal zones. The LGM is characterised by 2 to 6 times higher than modern detrital fluxes at most ODP Leg 177 sites. The LGM detrital fluxes do not show a latitudinal trend and suggest a greater supply of glaciogenic detritus sourced from southern South America. Glacial Patagonian outwash sediments (< 5 µm fraction) were analysed and compared to the bulk compositions of the marine sediments. The Pb IC of the Patagonian sediments is very similar to the glacial IC of sediments in the Scotia Sea and at ~ 49° S latitude in the eastern Atlantic sector. We propose that the glacial IC of sediments is controlled by increased delivery of Patagonian detritus initially supplied by glaciers and then transported at depth via the ACC.

Physical properties measured on sediment cores from high latitudes

This collection of 359 data sets represents raw data of physical properties measurements on Polarstern sediment cores from both polar oceans, sampled and measured between 1985 and 1995.

Estimation of sea surface temperature from sediment core PS1768-8

The quantitative diatom analysis of 218 surface sediment samples recovered in the Atlantic and western Indian sector of the Southern Ocean is used to define a base of reference data for paleotemperature estimations from diatom assemblages using the Imbrie and Kipp transfer function method. The criteria which justify the exclusion of samples and species out of the raw data set in order to define a reference database are outlined and discussed. Sensitivity tests with eight data sets were achieved evaluating the effects of overall dominance of single species, different methods of species abundance ranking, and no-analog conditions (e.g., Eucampia Antarctica) on the estimated paleotemperatures. The defined transfer functions were applied on a sediment core from the northern Antarctic zone. Overall dominance of Fragilariopsis kerguelensis in the diatom assemblages resulted in a close affinity between paleotemperature curve and relative abundance pattern of this species downcore. Logarithmic conversion of counting data applied with other ranking methods in order to compensate the dominance of F. kerguelensis revealed the best statistical results. A reliable diatom transfer function for future paleotemperature estimations is presented.

Geochemical and isotopic composition of Bransfield Basin Lavas collected during SONNE cruise SO155

Bransfield Basin is an actively extending marginal basin separating the inactive South Shetland arc from the northern Antarctic Peninsula. Rift-related volcanism is widespread throughout the central Bransfield Basin, but the wider eastern Bransfield Basin was previously unsampled. Lavas recovered from the eastern subbasin form three distinct groups: (1) Bransfield Group has moderate large-ion lithophile element (LILE) enrichment relative to normal mid-ocean ridge basalt (NMORB), (2) Gibbs Group has strong LILE enrichment and is restricted to a relic seamount interpreted as part of the South Shetland arc, and (3) fresh alkali basalt was recovered from the NE part of the basin near Spanish Rise. The subduction-related component in Bransfield and Gibbs Group lavas is a LILE-rich fluid with radiogenic Sr, Nd, and Pb isotope compositions derived predominantly from subducting sediment. These lavas can be modeled as melts from Pacific MORB source mantle contaminated by up to 5% of the subduction-related component. They further reveal that Pacific mantle, rather than South Atlantic mantle, has underlain Bransfield Basin since 3 Ma. Magma productivity decreases abruptly east of Bridgeman Rise, and lavas with the least subduction component outcrop at that end. Both the eastward decrease in subduction component and occurrence of young alkali basalts require that subduction-modified mantle generated during the lifetime of the South Shetland arc has been progressively removed from NE to SW. This is inconsistent with previous models suggesting continued slow subduction at the South Shetland Trench but instead favors models in which the South Scotia Ridge fault has propagated westward since 3 Ma generating transtension across the basin.

Sea-surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum

Based on the quantitative study of diatoms and radiolarians, summer sea-surface temperature (SSST) and sea ice distribution were estimated from 122 sediment core localities in the Atlantic, Indian and Pacific sectors of the Southern Ocean to reconstruct the last glacial environment at the EPILOG (19.5-16.0 ka or 23 000-19 000 cal yr. B.P.) time-slice. The statistical methods applied include the Imbrie and Kipp Method, the Modern Analog Technique and the General Additive Model. Summer SSTs reveal greater surface-water cooling than reconstructed by CLIMAP (Geol. Soc. Am. Map Chart. Ser. MC-36 (1981) 1), reaching a maximum (4-5 °C) in the present Subantarctic Zone of the Atlantic and Indian sector. The reconstruction of maximum winter sea ice (WSI) extent is in accordance with CLIMAP, showing an expansion of the WSI field by around 100% compared to the present. Although only limited information is available, the data clearly show that CLIMAP strongly overestimated the glacial summer sea ice extent. As a result of the northward expansion of Antarctic cold waters by 5-10° in latitude and a relatively small displacement of the Subtropical Front, thermal gradients were steepened during the last glacial in the northern zone of the Southern Ocean. Such reconstruction may, however, be inapposite for the Pacific sector. The few data available indicate reduced cooling in the southern Pacific and give suggestion for a non-uniform cooling of the glacial Southern Ocean.

Classification of Southern Ocean krill and icefish echoes using random forests

Acknowledgements The authors thank the crews, fishers, and scientists who conducted the various surveys from which data were obtained. This work was supported by the Government of South Georgia and South Sandwich Islands. Additional logistical support provided by The South Atlantic Environmental Research Institute, with thanks to Paul Brickle. PF receives funding from the MASTS pooling initiative (TheMarine Alliance for Science and Technology for Scotland), and their support is gratefully acknowledged. MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. SF is funded by the Natural Environment Research Council, and data were provided from the British Antarctic Survey Ecosystems Long-term Monitoring and Surveys programme as part of the BAS Polar Science for Planet Earth Programme. The authors also thank the anonymous referees for their helpful suggestions on an earlier version of this manuscript.

Sintomas depressivos e ansiosos, stresse, coping e resiliência em Técnicos Superiores de Reinserção Social

Introdução: Os trabalhos sobre correlatos psicológicos em Técnicos Superiores de Reinserção Social (TSRS) no nosso país são inexistentes. São nossos objetivos analisar os níveis de sintomas depressivos e ansiosos, stresse, coping e resiliência numa amostra de TSRS; explorar diferenças nestas variáveis por sexo, estado civil, Delegação regional e tipo de competências das equipas de reinserção social; explorar associações entre todas as variáveis referidas nesta amostra (entre si e com a variável sociodemográfica idade e as variáveis profissionais tempo de serviço e horas de trabalho semanal). Metodologia: 89 TSRS (sexo feminino, n = 67; 75,3%), com idades entre os 27 e os 61 anos (M = 47,4; DP = 7,10) preencheram um protocolo composto por questões sociodemográficas e profissionais, a Depression, Anxiety and Stress Scale, o Brief COPE e a Escala para avaliar as competências na área da Resiliência. Resultados: As mulheres apresentaram níveis maiores de Suporte Emocional e Instrumental comparativamente aos homens. Os profissionais da Delegação do Centro apresentaram pontuação mais elevada de Resiliência vs. da Delegação do Norte e os da Delegação do Norte maiores níveis de Stresse vs. os da Delegação do Sul e Ilhas. Os profissionais com competência mista apresentaram maiores níveis de Ansiedade vs. com competência específica. Encontrámos associações significativas (na amostra total) entre a Depressão e a Negação e o Uso de Substâncias. No sexo masculino o uso de Suporte Emocional e Instrumental associaram-se à Depressão e à Ansiedade. De uma forma geral, em todas as Delegações (consideradas separadamente), maiores níveis de Resiliência associaram-se a estratégias mais positivas de coping (e.g. Coping ativo) e maiores níveis de Depressão, Ansiedade e Stresse a níveis menores de estratégias positivas de coping (e.g. Aceitação) e a níveis maiores de estratégias negativas de coping (e.g. Uso de substâncias). Os técnicos quer de equipas com competência mista quer de equipas com competência específica, com níveis maiores de Ansiedade, apresentaram níveis maiores de estratégias de coping negativas (e.g. Negação). Discussão: Este estudo revelou existirem algumas diferenças por sexo nos TSRS e apresentou dados importantes sobre os construtos psicológicos dos TSRS de diferentes Delegações e de equipas com diferentes competências, apontando possíveis aspetos a considerar num trabalho de intervenção com estes profissionais. Tal como esperado, no geral, maiores níveis de resiliência associaram-se, como noutros profissionais, a estratégias mais positivas de coping e maiores níveis de sintomas a estratégias mais negativas de coping. / Introduction: Studies on psychological correlates on Probation Officers (TSRS) in our country are nonexistent. Our purposes are to analyze the levels of depressive and anxiety symptoms, stress, coping and resilience in a sample of TSRS; to explore differences in these variables by gender, marital status, Regional Delegation and type of responsibility of local organic units; to explore associations between all variables mentioned in this sample (among themselves and with the sociodemographic variable age and the professional variables years of service and weekly hours of work"). Methodology: 89 TSRS (females, n = 67, 75.3 %), aged between 27 and 61 years (M = 47.4, SD = 7.10) completed a protocol consisting of sociodemographic and professional questions, the Depression, Anxiety and Stress Scale, the Brief COPE Scale and the Scale to assess resilience skills. Results: Women had higher levels on Use of Instrumental and Emotional Social Support compared to men. The professionals of the Delegation of the Centre had higher scores on Resilience vs. professionals of the Delegation of the North and the North Delegation had higher levels of Stress vs. the Delegation of the South and Islands. The professionals with mixed competence had higher levels of Anxiety vs. those with specific competence. We found significant associations (in the total sample) between Depression, Denial and Substances Use. In males, the use of Emotional Social Support and Instrumental Support was associated with Depression and Anxiety. Overall, in all Delegations (considered separately), higher levels of Resilience were associated with more positive coping strategies (e.g., Active Coping) and higher levels of Depression, Anxiety and Stress with lower levels of positive coping strategies ( e.g. Acceptance) and higher levels of negative coping strategies (e.g. Substances Use). TSRS with higher levels of Anxiety, either in teams of mixed and specific competence, had higher levels of negative coping strategies (e.g. Denial). Discussion: This study revealed that there were some gender differences in TSRS and provided important data on the psychological constructs of TSRS of different Delegations and different types of organic units, pointing to possible issues to be addressed in an intervention work with these professionals. As expected, in general, higher levels of Resilience were associated, as in other professionals, with more positive coping strategies and higher levels of symptoms with more negative coping strategies.

(Table 1) Age determination of sediment cores south of the Faeroe Islands

A study was made of three cores from the Faeroe-Shetland gateway, based on planktonic foraminifera, oxygen isotopes, accelerator mass spectrometry 14C dates, magnetic susceptibility, and counts of ice rafted debris (IRD). The data, covering the period 30-10 ka, show that during the Last Glacial Maximum the Arctic Front occupied a position close to the Faeroes, allowing a persisting inflow of Atlantic surface water into the Faeroe-Shetland Channel. The oceanographic environment during deposition of two IRD layers is influenced by Atlantic surface water masses during the lower IRD layer, with transport of icebergs from N-NW. Polar surface water conditions prevailed only during deposition of the upper IRD layer. There is no indication of surface meltwater influence in the region during the deglaciation, but there is a persistent influence of Atlantic surface water masses in the region. Thus we conclude that during almost the entire period (30-10 ka) the Faeroe-Shetland Channel was a gateway for transport of Atlantic surface water toward the Norwegian Sea.