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.

Last Interglacial synthesis of high-latitude temperature: temperature anomalies and associated errors for 4 time slices

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 obtain. Here, we have selected 47 polar ice core and sub-polar marine sediment records and developed a strategy to align them onto the recent AICC2012 ice core chronology. We provide the first compilation of high-latitude temperature changes across the LIG associated with a coherent temporal framework built between ice core and marine sediment records. Our new data synthesis highlights non-synchronous maximum temperature changes between the two hemispheres with the Southern Ocean and Antarctica records showing an early warming compared to North Atlantic records. We also observe warmer than present-day conditions that occur for a longer time period in southern high latitudes than in northern high latitudes. Finally, the amplitude of temperature changes at high northern latitudes is larger compared to high southern latitude temperature changes recorded at the onset and the demise of the LIG. We have also compiled four data-based time slices with temperature anomalies (compared to present-day conditions) at 115 ka, 120 ka, 125 ka and 130 ka and quantitatively estimated temperature uncertainties that include relative dating errors. This provides an improved benchmark for performing more robust model-data comparison. The surface temperature simulated by two General Circulation Models (CCSM3 and HadCM3) for 130 ka and 125 ka is compared to the corresponding time slice data synthesis. This comparison shows that the models predict warmer than present conditions earlier than documented in the North Atlantic, while neither model is able to produce the reconstructed early Southern Ocean and Antarctic warming. Our results highlight the importance of producing a sequence of time slices rather than one single time slice averaging the LIG climate conditions.

Vertical profiles of environmental parameters measured from physical, optical and imaging sensors during station TARA_126 of the Tara Oceans expedition 2009-2013

The Tara Oceans Expedition (2009-2013) sampled the world oceans on board a 36 m long schooner, collecting environmental data and organisms from viruses to planktonic metazoans for later analyses using modern sequencing and state-of-the-art imaging technologies. Tara Oceans Data are particularly suited to study the genetic, morphological and functional diversity of plankton. The present data set includes properties of seawater, particulate matter and dissolved matter from physical, optical and imaging sensors mounted on a vertical sampling system (Rosette) used during the 2009-2013 tara Oceans Expedition. It comprised 2 pairs of conductivity and temperature sensors (SEABIRD components), and a complete set of WEtLabs optical sensors, including chrorophyll and CDOM fluorometers, a 25 cm transmissiometer, and a one-wavelength backscatter meter. In addition, a SATLANTIC ISUS nitrate sensor and a Hydroptic Underwater Vision Profiler (UVP) were mounted on the rosette. In the Arctic Ocean and Arctic Seas (2013), a second oxygen sensor (SBE43) and a four frequency Aquascat acoustic profiler were added. The system was powered on specific Li-Ion batteries and data were self-recorded at 24HZ. Sensors have all been factory calibrated before, during and after the four year program. Oxygen was validated using climatologies (WOA09). Nitrate and Fluorescence data were adjusted with discrete measurements from Niskin bottles mounted on the Rosette, and optical darks were performed monthly on board. A total of 839 quality checked vertical profiles were made during the tara Oceans expedition 2009-2013.

(Table 2) Age determination of Aegean Sea sediments

The modern Aegean Sea is an important source of deep water for the eastern Mediterranean. Its contribution to deep water ventilation is known to fluctuate in response to climatic variation on a decadal timescale. This study uses marine micropalaeontological and stable isotope data to investigate longer-term variability during the late glacial and Holocene, in particular that associated with the deposition of the early Holocene dysoxic/anoxic sapropel S1. Concentrating on the onset of sapropel-forming conditions, we identify the start of 'seasonal' stratification and highlight a lag in d18O response of the planktonic foraminifer N. pachyderma to termination T1b as identified in the d18O record of G. ruber. By use of a simple model we determine that this offset cannot be a function of bioturbation effects. The lag is of the order of 1 kyr and suggests that isolation of intermediate/deep water preceded the start of sapropel formation by up to 1.5 kyr. Using this discovery, we propose an explanation for the major unresolved problem in sapropel studies, namely, the source of nutrient supply required for export productivity to reach levels needed for sustained sapropel deposition. We suggest that nutrients had been accumulating in a stagnant basin for 1-1.5 kyr and that these accumulated resources were utilized during the deposition of S1. In addition, we provide a first quantitative estimate of the diffusive (1/e) mixing timescale for the eastern Mediterranean in its "stratified" sapropel mode, which is of the order of 450 years.

(Table 2) Salinity, pH, alkalinity and major ion concentrations in ANDRILL core AND-2A pore water

The compositional record of the AND-2A drillcore is examined using petrological, sedimentological, volcanological and geochemical analysis of clasts, sediments and pore waters. Preliminary investigations of basement clasts (granitoids and metasediments) indicate both local and distal sources corresponding to variable ice-volume and ice-flow directions. Low abundance of sedimentary clasts (e.g., arkose, litharenite) suggests reduced contributions from sedimentary covers while intraclasts (e.g., diamictite, conglomerate) attest to intrabasinal reworking. Volcanic material includes pyroclasts (e.g., pumice, scoria), sediments and lava. Primary and reworked tephra layers occur within the Early Miocene interval (1093 to 640 metres below sea floor mbsf). The compositions of volcanic clasts reveal a diversity of alkaline types derived from the McMurdo Volcanic Group. Finer-grained sediments (e.g., sandstone, siltstone) show increases in biogenic silica and volcanic glass from 230 to 780 mbsf and higher proportions of terrigenous material c. 350 to 750 mbsf and below 970 mbsf. Basement clast assemblages suggest a dominant provenance from the Skelton Glacier - Darwin Glacier area and from the Ferrar Glacier - Koettlitz Glacier area. Provenance of sand grains is consistent with clast sources. Thirteen Geochemical Units are established based on compositional trends derived from continuous XRF scanning. High values of Fe and Ti indicate terrigenous and volcanic sources, whereas high Ca values signify either biogenic or diagenic sources. Highly alkaline and saline pore waters were produced by chemical exchange with glass at moderately elevated temperatures.

A globális éghajlatváltozás interaktív és komplex forgatókönyveinek modellezése és elemzése

A tanulmány célja a JCM szimulációs modell alkalmazásának részletes, és reprodukálható módon történő bemutatása saját kidolgozású forgatókönyvek alapján. A modell és a modellszimulációk az ember/felhasználó és a gép közötti interaktivitást mutatják be. Ennek érdekében a tanulmány részletesen foglalkozik az éghajlatváltozás modellezésének történetével, a főbb modelltípusokkal, valamint a humán-társadalmi tényezők és az éghajlatváltozás közötti dinamikus kapcsolatok lehetséges változásának előrejelzési kérdéseivel. A saját forgatókönyveinek kidolgozásához, és az interaktív klímamodell szimulációjának tervezéséhez felhasználja az IPCC és az UNEP GEO programjai keretében készült forgatókönyveket. A tanulmány az IPCC és a GEO jelentéseket az interaktív klímamodellezési előrejelzések előzményeinek tekinti, mert mindkét program felhasználja a különböző klímamodellekkel végzett számítások és előrejelzések eredményeit is a forgatókönyvei és az ajánlásai kidolgozásához, valamint jelentősen kiszélesíti az előretekintési munkálatokban részt vevők körét.

Földrajzi Információs Rendszerek gyakorlati alkalmazása

A kötetben megjelenő tanulmányok: - Versenyelőnyben a térinformatikával - Geoinformation Learning Infrastructure - A TeIR és területi tervezést támogató térinformatikai alkalmazásai - A Nemzeti Alkalmazkodási Térinformatikai Rendszer (NATéR) létrehozása - Mezőgazdaságból származó biomassza, mint energiaforrás becslése GIS támogatással - Az utazási idő modellezése térinformatikai módszerek felhasználásával - Webes adatgyűjtés lehetőségei az Airbnb vizsgálatában - Térinformatika a vidékfejlesztésben: a GUIDE@HAND okostelefonos alkalmazás

A caminho da fase preparatória da criação de um Core Set para a obesidade infantojuvenil: revisão sistemática da literatura

O trabalho apresentado prende-se na necessidade de criação de Core Sets específicos para Crianças e Jovens, sendo que o objetivo deste representa a proposta de criação do mesmo, direcionado para a população infantojuvenil com Obesidade. Deste modo, desenvolveu-se uma Revisão Sistemática, parte integrante da 1ª fase da criação de um Core Set (CS). Para este efeito, foram recolhidos 570 artigos das bases de dadosMEDLINE/PubMed, ScienceDirect, b-on, PEDro, PROSPERO, dos quais 187 representam a amostra final de estudos incluídos, na qual a faixa etária da população está compreendida entre os 2 e os 19 anos, com Índice de Massa Corporal (IMC)≥ao percentil de 95 para a idade e género, publicados em Inglês no máximo há 10 anos. Dos 187 artigos, foram levantadas 1856 necessidades, das quais se ligaram 963 conceitos àClassificação Internacional da Funcionalidade e Incapacidade de Crianças e Jovens (CIF-CJ), identificando-se desta forma 109 categorias. Destas obteve-se 11,92% de categorias com saturação no domínio das Funções e Estruturas; 6,42% nas Atividades e Participação e 8,26% nos Fatores Contextuais, o que se traduz no total de 29 categorias possíveis de integração num futuroCS.