Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins

Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins

Professor Martin Bell Convenor: Field Methods and Experimentation in Geoarchaeology Martin teaches environmental archaeology, geoarchaeology, and coastal and maritime archaeology. His research concerns the contribution which archaeology makes to an understanding of environmental change on a wide range of timescales. Analytically he is interested in the analysis of soils, sediments and molluscs, land and marine. Prehistory of soil erosion, Experimental archaeology Coastal environments. This has particularly involved major excavations at Brean Down, Goldcliff and Redwick.


Download powerpoint Figure 1. Schematic location and duration of the records, for a selection of palaeoenvironmental records in the Southern Levant, 25 BP—present. Records have been tentatively classified into four categories depending on their continuity, resolution and dating constrain: Scale bar, 50 km. In this contribution, I will review the palaeoenvironmental context of the Levant established by previous studies, including some of the more recent developments in Late Quaternary palaeoenvironmental research for the region.

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This work is due to be completed early in Work continues on revising the regional glacial stratigraphy of Buchan, Caithness and Orkney, and to assess whether or not the Fennoscandian ice sheet crossed the Northern Isles. We are now applying that technique to the last glaciation of the Outer Hebrides.

Extreme waves and the evolution of coastal cliffs “Stenness, Eshaness, Shetland. These isles are exposed continually to the uncontrolled violence of the Atlantic, for no land intervenes between their western shores and America. The prevalence, therefore, of strong westerly gales, causes the waves to be sometimes driven with irresistible force upon the coast, while there is also a current setting from the north. The spray of the sea aids the decomposition of the rocks, and prepares them to be breached by the mechanical force of the waves.

Steep cliffs are hollowed out into deep caves and lofty arches; and almost every promontory ends in a cluster of rocks, imitating the forms of columns, pinnacles, and obelisks. Modern observations show that the reduction of continuous tracts to such insular masses is a process in which Nature is still actively engaged. The work has received wide attention and demonstrated that storm waves on deep water coasts can reach as high as 50 m a. Recent work has focused on using boulder size as a proxy for estimating storm wave current velocities on shore platforms.

A new thread is to model the impact of storm waves on the amazing sea caves on Shetland. Long term rates and processes of shore platform erosion Galson, Lewis. Raised rock platform overlain by beach gravels and Late Devensian till.

Hunter-Gatherers in the Post-Glacial World

Yet very few people know that it was built in several stages over a period of more than a thousand years, starting nearly five thousand years ago. Most are unaware that it is surrounded by dozens of burial mounds and other earthworks that created a vast Bronze Age ritual landscape. Moreover, despite its fame, Stonehenge is only one of many arrangements of upright stones in the British Isles. Archaeologists puzzle over the Bronze Age societies that built these monuments; however, they know that they were not Druids, to whom popular literature often attributes Stonehenge.

Uranium-series dating of peat from central and Northern Europe / Manfred Frechen, Melanie Sierralta, Deniz Oezen, Brigitte Urban — 9. U-redistribution in fossil reef corals from Barbados, West Indies, and sea-level reconstruction for MIS / Denis Scholz, Augusto Mangini, Dieter Meischner —

This article has been cited by other articles in PMC. Abstract Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect is challenging to assess due to the diverse processes controlling the release of various organic carbon OC pools from heterogeneous Arctic landscapes. Here, by radiocarbon dating various terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting the contrasting mobilization mechanisms of surface vs.

Vascular plant-derived lignin phenol 14C contents reveal significant inputs of young carbon from surface sources whose delivery is dominantly controlled by river runoff. In contrast, plant wax lipids predominantly trace ancient permafrost OC that is preferentially mobilized from discontinuous permafrost regions, where hydrological conduits penetrate deeper into soils and thermokarst erosion occurs more frequently.

These findings suggest that although partly masked by surface carbon export, climate change-induced mobilization of old permafrost carbon is well underway in the Arctic. Although increased respiration of permafrost carbon has recently been documented with warming 3 and thawing 4 in Arctic soils, information on the large-scale mobilization of old carbon deposits via fluvial and coastal processes remains sparse 5 , 6. Alteration in permafrost coverage also affects the availability of various hydrological conduits, and thus mobilization pathways of OC associated with different permafrost depths and structures 6 , 8.

Asian Institute of Management

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See other articles in PMC that cite the published article. Abstract It is generally assumed that declining atmospheric lead concentrations in urban centers during the s and s were due almost entirely to the progressive introduction of unleaded gasoline. However, most environmental data are from monitoring programs that began only two to three decades ago, which limits their usefulness. Here, trace metal and radionuclide data from sediment cores in Central Park Lake provide a record of atmospheric pollutant deposition in New York City through the 20th century, which suggests that leaded gasoline combustion was not the dominant source of atmospheric lead for NYC.

Temporal trends of lead, zinc, and tin deposition derived from the lake sediments closely resemble the history of solid waste incineration in New York City. Furthermore, widespread use of solid waste incinerators in the United States and Europe over the last century suggests that solid waste incineration may have provided the dominant source of atmospheric lead and several other metals to many urban centers.

Introduction Great attention has been given to the strong correlations between decreases in the consumption of leaded gasoline during the s and s and coincident decreases in urban atmospheric lead or human blood lead levels, with most investigators suggesting a causal relationship 1 — 3.

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Determines age of fossils, artifacts, or rocks in years before present BP Absolute Dating: Radiometric Techniques – Most date strata associated with what? Trapped electrons measured and divided by accumulation rate.

Hilgers, A. The chronology of Late Glacial and Holocene dune development in the northern Central European lowland reconstructed by optically stimulated luminescence (OSL) dating. Ph.D. thesis, University of Cologne, pp.

Scientists discovered that one form of uranium will undergo nuclear fission. Nuclear fission is the process in which the nuclei of large atoms break apart. Large amounts of energy and smaller atoms are produced during fission. The first application of this discovery was in the making of nuclear weapons, such as the atomic bomb. After the war, nuclear power plants were built to make productive use of nuclear fission.

Nuclear power plants convert the energy released by fission to electricity. Today, uranium is regarded as one of the most important elements for the future of the human race. Discovery and naming Credit for the discovery of uranium is usually given to German chemist Martin Klaproth


G Back to the top Gender: The principal forms are resistivity meters, magnetometers and ground penetrating radar GPR. Geographical Information System s:

Table of Contents Preface Thorsten Kiefer and Christoph Kuli xi Uranium-Series Dating of Peat from Central and Northern Europe 93 Manfred Frechen, Melanie Sierralta, Deniz Oezen and Brigitte Urban 9. U-Redistribution in Fossil Reef Corals from Barbados, West Indies, and Sites of Central Europe Wilfried Rosendahl, Doris Döppes and.

Our current understanding of the Quaternary dynamics of the NSS are drawn from: There are also palaeohydrological reconstructions at low spatial resolution for two key former river channels, which reveal wetter conditions particularly during MIS 5 followed by progressive aridification. This PhD offers an opportunity to add a substantial dataset on landscape dynamics in this fascinating and globally important region.

Suggested project ideas include: Methods and training The successful applicant will receive full training in sedimentary analysis and luminescence dating. The intention is for the project s to utilise both full-laboratory dating protocols and the rapidly-advancing field of portable luminescence reader analysis to facilitate a spatial-scale of analysis and volume of samples that cannot be sensibly achieved using time- and resource-intensive laboratory protocols.

Paleoclimatology : reconstructing climates of the quaternary

Acidification processes in high alpine lakes. Balkema Publishers, Rotterdam, pp. American Association for the Advancement of Science: Marked post th century environmental change in high-arctic ecosystems. Science, , — ; Shindell, D. Solar forcing of regional climate change during the Maunder Minimum.

Uranium-series dating of peat from Central and Northern Europe / Manfred Frechen, Melanie Sierralta, Deniz Oezen and Brigitte Urban 9. U-redistribution in fossil reef corals from Barbados, West Indies, and sea-level reconstruction for MIS / Denis Scholz, Augusto Mangini and Dieter Meischner.

Makati — Makati, officially the City of Makati, in the Philippines, is one of the sixteen cities that make up Metro Manila. Makati is the center of the Philippines, it has the highest concentration of multinational and local corporations in the country. Major banks, corporations, department stores as well as foreign embassies are based in Makati, the biggest trading floor of the Philippine Stock Exchange is situated along the citys Ayala Avenue. Makati is also known for being a cultural and entertainment hub in Metro Manila.

As a result of the barrier the question was misinterpreted, and the Tagalog pointed to the receding tide of the Pasig River. Parts of the city were subject to the pre-Hispanic Kingdom of Namayan. It became an independent municipality in , and was christened San Pedro de Macati in honour of the towns patron, the town was also famous for its pottery industry since the 18th century, with skilled potters trained by Jesuit priests.

Its strategic location made it a pitstop for pilgrims, travelling by foot or boat, towards the shrine of Our Lady of Peace. Culi-Culi is now a barangay named in honour of Del Pilar, by , Spain ceded the Philippines and other overseas possessions to the United States after the formers defeat in the Spanish—American War. That same year, the town, with a population of 25, , was incorporated from Manila to the new province of Rizal.

On February 28, , the The Philippine Legislature passed Act , shortening the name, San Pedro de Macati, during that same period, Santa Ana Park, the nations second horse racing facility, opened to expectations from horse racing fans. The first office buildings were built on what is now the Makati Central Business District, since the late s, Makati has transformed into the financial and commercial capital of the country.

Makatis central location adjacent to the city of Manila also made it a hub for major national and international corporations.

Global Change in the Holocene

While residence time in the atmosphere of the very finest of these particles can be substantial, the deposition of the bulk of volcanic ejecta can be considered instantaneous from a geological, archaeological, and evolutionary perspective. Often these volcanic products can be identified by various chemical and non-chemical means and if the eruption date is known, the occurrence of tephra from a given eruption in stratigraphic sequences provides a powerful means of dating such deposits, or of refining available dating schemes.

Furthermore, the occurrence of tephra from the same eruption across sites, regions and in various types of depositional contexts ice-cores, terrestrial, marine, cultural holds the potential of linking and thus elucidating the tempi and causes of both environmental and cultural change. Recent years have seen considerable advances in tephrochronology studies, especially regarding the detection of macroscopically invisible micro- or cryptotephras.

In parallel with the possibility of detecting hitherto invisible tephras over vastly increased areas, the overall potential of tephrochronology as a major dating tool for both palaeoenvironmental scientists and archaeologists is greatly expanded.

In this study, uranium-series dating of peat in Central and Northern Europe is reviewed including new thermal ionisation mass spectrometry (TIMS) Th/U dating results from recently investigated interglacial peat horizons in Central Europe.

Cybulski, Ornella Semino, Ripan S. Malhi and Antonio Torroni Abstract We evaluated migration models to the Americas by employing the information contained in A2a and B2a native mitogenomes from North America. In brief, a minimum of three migration waves is needed to explain the native mitogenome diversity of North America. Most of the contemporary mtDNA variation along the double-continent stems from the first wave that from Beringia followed the Pacific coast route and was dated to thousand years ka ago based on the 16 mitogenome founders identified so far.

Since our B2a mtDNAs coalesce at about ka ago, it is likely that the diagnostic mutational motif of B2a evolved in situ a few millennia after that B2 had already entered and spread along the double continent. The first pacific wave was accompanied or followed by a second inland migratory event, marked by haplogroups X2a and C4c, which affected the ancestral gene pools of modern Amerindian groups of Northern North America, from the Pacific to the Atlantic coasts, including the Na-Dene.

An Examination of Cultural and Natural Fracture Patterns on Brittle Solids Jacob Adams and Tyler Retherford Abstract Differentiating culturally modified artifacts from geofacts modified by natural processes has long been a topic of concern in archaeology. This issue is particularly pertinent for pre-Clovis occupations in the Amer- icas that often have questionable contexts and association that keep pushing the colonization of the New World back in time.

In the context of this poster we compare fracture patterns on obsidian cores made in an experimental context that simulates natural fracture to human made cores using multiple reduction techniques in attempt to elucidate the nature of fracture patterns that result from different processes. While the forces creating these fractures in brittle solids have been explored extensively, this poster approaches the issue in an attempt to analyze their utility as a proxy for natural vs.

We attempt to take the many different forms of surface fracture and sort them into types useful for this method of analysis. We hope this methodology, focusing on fracture patterning, provides a way to use cores as an additional line of evidence in answering this contentious archaeological question.

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