Search

Your search keyword '"Codilean, Alexandru T"' showing total 245 results
Start Over Author "Codilean, Alexandru T"
245 results on '"Codilean, Alexandru T"'

4. Short communication: Updated CRN Denudation datasets in OCTOPUS v2.3.

Author

Codilean, Alexandru T. and Munack, Henry

Subjects
DIGITAL Object Identifiers, ATMOSPHERIC pressure, ACQUISITION of data, DATA quality, OCTOPUSES
Abstract

OCTOPUS v2.3 includes updated CRN Denudation datasets, adding 1,311 new river basins to the CRN International and CRN Australia collections. The updates bring the total number of basins with recalculated 10Be denudation rates to 5,611, and those with recalculated 26Al rates to 561. To improve data relevance and usability, redundant data fields have been removed, retaining only those relevant to each collection. Additional updates include the introduction of several new data fields: the latitude of the basin centroid and the effective basin-averaged atmospheric pressure, both of which improve interoperability with online erosion rate calculators. Other new fields record the extent of present-day glaciers and their potential impact on denudation rates, as well as estimates of the percentage of quartz-bearing lithologies in each basin — providing a basis for evaluating data quality. The updated data collections can be accessed at https://octopusdata.org (last access: 01 Dec 2024). The CRN International and CRN Australia data collections can also be accessed via their respective digital object identifiers (DOIs). [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

5. The SahulCHAR Collection: A Palaeofire Database for Australia, New Guinea, and New Zealand.

Author

Rehn, Emma, Cadd, Haidee, Mooney, Scott, Cohen, Tim J., Munack, Henry, Codilean, Alexandru T., Adeleye, Matthew, Beck, Kristen K., IV, Mark Constantine, Gouramanis, Chris, Hanson, Johanna M., Jones, Penelope J., Kershaw, A. Peter, Mackenzie, Lydia, Maisie, Maame, Mariani, Michela, Mately, Kia, McWethy, David, Mills, Keely, and Moss, Patrick

Subjects
DATABASES, CARBON-black, CHARCOAL, METADATA, OCTOPUSES
Abstract

Recent global fire activity has highlighted the importance of understanding fire dynamics across time and space, with records of past fire (palaeofire) providing valuable insights to inform current and future management challenges. New records from the recent increase in palaeofire studies from Australia and surrounds have not been captured in any database for broader comparisons, and Australasia is poorly represented in current international databases used for global modelling of palaeofire trends. These problems are addressed by SahulCHAR, a new collection of sedimentary charcoal and black carbon records from Sahul (Australia, New Guinea, and offshore islands) and New Zealand. Data are stored in the OCTOPUS relational database platform, with a structure designed for compatibility with the existing Global Paleofire Database. Metadata are captured at site-level and observation-level, with observations including age determinations and charcoal or black carbon data. SahulCHAR Version 1 contains 687 records of charcoal or black carbon, including digitized data, unchanged and modified records from the Global Paleofire Database, and original author-submitted data. SahulCHAR is a much-needed update on past regional palaeofire compilations that will also provide greater representation of records from Sahul and New Zealand in future global syntheses. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

7. OCTOPUS Database v.2.2 Indo-Pacific Pollen - IPPD

Author

Herbert, Annika V, Haberle, Simon G, Munack, Henry, Codilean, Alexandru T, Herbert, Annika V, Haberle, Simon G, Munack, Henry, and Codilean, Alexandru T

Abstract

A collection of palaeoecological records containing pollen data and related site and dating information from around Australia and the Indo-pacific region. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2024

8. OCTOPUS Database v.2.2: Sedimentary Charcoal Records Sahul & NZ

Author

Rehn, Emma, Cadd, Haidee, Mooney, Scott, Cohen, Timothy J, Munack, Henry, Codilean, Alexandru T, Adeleye, Matthew, Beck, Kristen K, Constantine IV, Mark, Gouramanis, Chris, Hanson, Johanna M, Jones, Penelope J, Kershaw, Peter, Mackenzie, Lydia, Maisie, Maame, Mariani, Michela, Matley, Kia, McWethy, David, Mills, Keely, Moss, Patrick, Patton, Nicholas R, Rowe, Cassandra, Stevenson, Janelle, Tibby, John, Wilmshurst, Janet, Rehn, Emma, Cadd, Haidee, Mooney, Scott, Cohen, Timothy J, Munack, Henry, Codilean, Alexandru T, Adeleye, Matthew, Beck, Kristen K, Constantine IV, Mark, Gouramanis, Chris, Hanson, Johanna M, Jones, Penelope J, Kershaw, Peter, Mackenzie, Lydia, Maisie, Maame, Mariani, Michela, Matley, Kia, McWethy, David, Mills, Keely, Moss, Patrick, Patton, Nicholas R, Rowe, Cassandra, Stevenson, Janelle, Tibby, John, and Wilmshurst, Janet

Abstract

An open database of sedimentary charcoal and black carbon records from Australia, New Guinea, and New Zealand. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2024

9. OCTOPUS Database v.2.2: Sedimentary Charcoal Records Sahul & NZ (units only)

Author

Rehn, Emma, Cadd, Haidee, Mooney, Scott, Cohen, Timothy J, Munack, Henry, Codilean, Alexandru T, Adeleye, Matthew, Beck, Kristen K, Constantine IV, Mark, Gouramanis, Chris, Hanson, Johanna M, Jones, Penelope J, Kershaw, Peter, Mackenzie, Lydia, Maisie, Maame, Mariani, Michela, Matley, Kia, McWethy, David, Mills, Keely, Moss, Patrick, Patton, Nicholas R, Rowe, Cassandra, Stevenson, Janelle, Tibby, John, Wilmshurst, Janet, Rehn, Emma, Cadd, Haidee, Mooney, Scott, Cohen, Timothy J, Munack, Henry, Codilean, Alexandru T, Adeleye, Matthew, Beck, Kristen K, Constantine IV, Mark, Gouramanis, Chris, Hanson, Johanna M, Jones, Penelope J, Kershaw, Peter, Mackenzie, Lydia, Maisie, Maame, Mariani, Michela, Matley, Kia, McWethy, David, Mills, Keely, Moss, Patrick, Patton, Nicholas R, Rowe, Cassandra, Stevenson, Janelle, Tibby, John, and Wilmshurst, Janet

Abstract

An open database of sedimentary charcoal and black carbon records from Australia, New Guinea, and New Zealand. This collection contains unit-level information only. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2024

10. OCTOPUS Database v.2.2: The CRN Denudation Global collection [2024]

Author

Codilean, Alexandru T, Munack, Henry, Codilean, Alexandru T, and Munack, Henry

Abstract

Database of published cosmogenic Be-10 and Al-26 concentrations from modern river sediment and basin-averaged denudation rates inferred from these data. Ancillary spatial data includes: sample site location (point), basin outline (polygon), digital elevation model (raster), D8 flow direction and flow accumulation grids (raster), topographic gradient (raster), atmospheric pressure (raster), and cosmogenic nuclide production scaling factor and topographic shielding grids (raster). The vector spatial data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. The raster data uses the WGS86/UTM projected coordinate reference system, UTM zones depending on the extent and location of each data package. Sample metadata is comprehensive and includes all necessary information and input files for the recalculation of denudation rates using the CAIRN model (https://github.com/LSDtopotools/LSDTopoTools_CRNBasinwide). All denudation rates were recalculated and harmonised using CAIRN. The extent of the data is global, excluding Australia.

Published
2024

11. OCTOPUS Database v.2.2: Indo-Pacific Pollen - IPPD (datasets level only)

Author

Herbert, Annika V, Haberle, Simon G, Munack, Henry, Codilean, Alexandru T, Herbert, Annika V, Haberle, Simon G, Munack, Henry, and Codilean, Alexandru T

Abstract

A collection of palaeoecological records containing pollen data and related site and dating information from around Australia and the Indo-pacific region. This collection contains dataset-level information only. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2024

12. OCTOPUS Database v.2.2: The CRN Denudation Australian collection [2024]

Author

Codilean, Alexandru T, Munack, Henry, Codilean, Alexandru T, and Munack, Henry

Abstract

Database of published cosmogenic Be-10 and Al-26 concentrations from modern river sediment and basin-averaged denudation rates inferred from these data. Ancillary spatial data includes: sample site location (point), basin outline (polygon), digital elevation model (raster), D8 flow direction and flow accumulation grids (raster), topographic gradient (raster), atmospheric pressure (raster), and cosmogenic nuclide production scaling factor and topographic shielding grids (raster). The vector spatial data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. The raster data uses the WGS86/UTM projected coordinate reference system, UTM zones depending on the extent and location of each data package. Sample metadata is comprehensive and includes all necessary information and input files for the recalculation of denudation rates using the CAIRN model (https://github.com/LSDtopotools/LSDTopoTools_CRNBasinwide). All denudation rates were recalculated and harmonised using CAIRN. The extent of the data covers Australia.

Published
2024

18. Magnitude and timing of transient incision resulting from large‐scale drainage capture, Sutlej River, Northwest Himalaya.

Author

Penserini, Brian D., Morell, Kristin D., Codilean, Alexandru T., Fülöp, Réka‐H., Wilcken, Klaus M., Yanites, Brian J., Kumar, Anil, Fan, Suoya, and Mearce, Trevor

Subjects
DRAINAGE, SEDIMENT transport, EROSION, SOUND recordings, OROGENIC belts, SEDIMENTARY rocks, PLEISTOCENE Epoch, SEDIMENTS
Abstract

Few studies have constrained the magnitudes and timescales associated with large‐scale drainage captures (areas >103 km2), even though these constraints are crucial to reconstruct sediment budgets, assess the potential for drainage reorganization to be preserved in the rock record, and determine the extent to which environmental signals (i.e., structures, composition and fossil assemblages within sedimentary rocks that are influenced by sediment supply and transport) are representative of conditions during deposition. In this work, we characterize the Pleistocene capture of the Zhada Basin, an ~23 000 km2 extensional basin in southern Tibet, by the Sutlej River, a prominent tributary to the Indus River. We quantify the magnitudes and timescales of capture‐driven erosion using knickpoint celerity modelling, paleotopographic reconstructions, 10Be‐derived denudation rates, and topographic analyses of drainage divides. We find that capture has removed 2010 ± 400 km3 of sediment from the Zhada Basin, increasing sediment supply to the Sutlej network by 17%–29% since 735 ± 269 ka. This work represents a crucial step towards reconstructing the Pleistocene sediment budget of the Indus sedimentary system and identifying potential impacts from sediment redistribution. We also identify several plausible tectonic or autogenic mechanisms that may have facilitated capture of the Zhada Basin, including: (1) preferential erosion of weak lithologies along active faults, (2) headward erosion in response to prior capture of the Spiti River and (3) headward erosion generated by breaching of a structural culmination downstream (the Kullu‐Rampur Window). This provides a framework to assess the mechanistic links between arc‐parallel extension, large‐scale drainage capture, landscape evolution and orogenic wedge deformation. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

20. Neogene aridification and lake development in the Issyk‐Kul basin, Kyrgyzstan

Author

Kudriavtseva, Anna, primary, Sobel, Edward R., additional, Codilean, Alexandru T., additional, Meijers, Maud J. M., additional, Mulch, Andreas, additional, Hoke, Gregory D., additional, Fink, David, additional, Mikolaichuk, Alexander V., additional, Fülöp, Réka‐H., additional, Wilcken, Klaus M., additional, and Enge, T. Gabriel, additional

Published
2023
Full Text
View/download PDF

21. SahulArch: A geochronological database for the archaeology of Sahul

Author

Saktura, Wanchese M., primary, Rehn, Emma, additional, Linnenlucke, Lauren, additional, Munack, Henry, additional, Wood, Rachel, additional, Petchey, Fiona, additional, Codilean, Alexandru T., additional, Jacobs, Zenobia, additional, Cohen, Tim J., additional, Williams, Alan N., additional, and Ulm, Sean, additional

Published
2023
Full Text
View/download PDF

22. Constraints on the late Quaternary glacial history of the Inylchek and Sary-Dzaz valleys from in situ cosmogenic 10Be and 26Al, eastern Kyrgyz Tian Shan

Author

Lifton, Nathaniel, Beel, Casey, Hättestrand, Clas, Kassab, Christine, Rogozhina, Irina, Heermance, Richard, Oskin, Michael, Burbank, Douglas, Blomdin, Robin, Gribenski, Natacha, Caffee, Marc, Goehring, Brent M., Heyman, Jakob, Ivanov, Mikhail, Li, Yanan, Li, Yingkui, Petrakov, Dmitry, Usubaliev, Ryskul, Codilean, Alexandru T., Chen, Yixin, Harbor, Jon, and Stroeven, Arjen P.

Published
2014
Full Text
View/download PDF

25. Impact of Quaternary Glaciations on Denudation Rates in North Pamir—Tian Shan Inferred From Cosmogenic 10Be and Low‐Temperature Thermochronology.

Author

Kudriavtseva, Anna, Codilean, Alexandru T., Sobel, Edward R., Landgraf, Angela, Fülöp, Réka‐H., Dzhumabaeva, Atyrgul, Abdrakhmatov, Kanatbek, Wilcken, Klaus M., Schildgen, Taylor, Fink, David, Fujioka, Toshiyuki, Gong, Lingxiao, Rosenwinkel, Swenja, Merchel, Silke, and Rugel, Georg

Subjects
GLACIAL Epoch, QUATERNARY Period, CLIMATE change, NEOGENE Period, PLEISTOCENE Epoch, OROGENIC belts, EROSION, GLACIATION, MOUNTAINS
Abstract

We explore the spatial and temporal variations in denudation rates in the northern Pamir—Tian Shan region using 10Be‐derived denudation rates from modern (n = 110) and buried sediment (2.0–2.7 Ma; n = 3), and long‐term exhumation rates from published apatite fission track (AFT; n = 705) and apatite (U‐Th‐Sm)/He (AHe; n = 211) thermochronology. We found moderate correlations between denudation rates and topographic metrics and weak correlations between denudation rates and annual rainfall, highlighting complex linkages among tectonics, climate, and surface processes that vary locally. The 10Be data show a spatial trend of decreasing modern denudation rates from west to east, suggesting that deformation and precipitation control denudation in the northern Pamir and western Tian Shan. Farther east, the denudational response of the landscape to Quaternary glaciations is more pronounced and reflected in our data. Modern 10Be denudation rates are generally higher than the long‐term AFT and AHe exhumation rates across the studied area. In the Kyrgyz Tian Shan, on average, the highest 10Be denudation rates are recorded in the Terskey range, south of Lake Issyk‐Kul. Here, modern denudation rates are higher than 10Be‐derived paleo‐denudation rates, which are comparable in magnitude with the long‐term exhumation rates inferred from AFT and AHe. We propose that denudation in the region, particularly in the Terskey range, remained relatively steady during the Neogene and early Pleistocene. Denudation increased due to glacial‐interglacial cycles in the Quaternary, but this occurred after the onset and intensification of the Northern Hemisphere glaciations at 2.7 Ma. Plain Language Summary: Tectonic forces create mountains, while climatically modulated erosion breaks them down into sediment that rivers carry to the final depositional basin. This cycle affects global climate over long periods, but it's unclear whether mountain uplift causes climate change or if climate cooling leads to faster erosion and mountain uplift. To tackle these questions, we explore temporal and spatial changes in rates of denudation in the northern Pamir—Tian Shan region and find that rates remained steady during the Neogene and early Pleistocene but increased due to glacial‐interglacial cycles in the Quaternary. We also find that modern denudation rates decrease from west to east. This suggests that tectonic deformation controls denudation in the northern Pamir and western Tian Shan, while further east the denudational response of the landscape to Quaternary glaciations is more pronounced and reflected in our data. Dominant controls on modern denudation rates vary across the mountain range and reflect local factors. Our results highlight how the evolution of mountain belts strongly depends on denudation, which reflects complex interactions between tectonics, climatic changes, and surface processes, and show how in the northern Pamir—Tian Shan region, climate cooling during the Quaternary period resulted in faster erosion rates. Key Points: Modern denudation rates are higher than paleo‐denudation rates from 2.0 to 2.7 Ma and exhumation rates inferred from thermochronologyDenudation in the Terskey range remained steady during the Neogene and early Pleistocene and then increased in the Quaternary after 2.0 MaThe denudational response to Quaternary glaciations is detectable in the Kyrgyz and Chinese portions of the Tian Shan [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

26. OCTOPUS database (v.2)

Author

Codilean, Alexandru T, Munack, Henry, Saktura, Wanchese M, Cohen, Tim J, Jacobs, Zenobia, Ulm, Sean, Hesse, Paul P, Heyman, Jakob, Peters, Katharina J, Williams, Alan N, Saktura, Rosaria B K, Rui, Xue, Chishiro-Dennelly, Kai, Panta, Adhish, University of Zurich, and Codilean, Alexandru T

Subjects
10207 Department of Anthropology, 300 Social sciences, sociology & anthropology, 1900 General Earth and Planetary Sciences, General Earth and Planetary Sciences
Abstract

OCTOPUS v.2 is an Open Geospatial Consortium (OGC) compliant web-enabled database that allows users to visualise, query, and download cosmogenic radionuclide, luminescence, and radiocarbon ages and denudation rates associated with erosional landscapes, Quaternary depositional landforms, and archaeological records, along with ancillary geospatial (vector and raster) data layers. The database follows the FAIR (Findability, Accessibility, Interoperability, and Reuse) data principles and is based on open-source software deployed on the Google Cloud Platform. Data stored in the database can be accessed via a custom-built web interface and via desktop geographic information system (GIS) applications that support OGC data access protocols. OCTOPUS v.2 hosts five major data collections. CRN Denudation and ExpAge consist of published cosmogenic 10Be and 26Al measurements in modern fluvial sediment and glacial samples respectively. Both collections have a global extent; however, in addition to geospatial vector layers, CRN Denudation also incorporates raster layers, including a digital elevation model, gradient raster, flow direction and flow accumulation rasters, atmospheric pressure raster, and CRN production scaling and topographic shielding factor rasters. SahulSed consists of published optically stimulated luminescence (OSL) and thermoluminescence (TL) ages for fluvial, aeolian, and lacustrine sedimentary records across the Australian mainland and Tasmania. SahulArch consists of published OSL, TL, and radiocarbon ages for archaeological records, and FosSahul consists of published late-Quaternary records of direct and indirect non-human vertebrate (mega)fauna fossil ages that have been systematically quality rated. Supporting data are comprehensive and include bibliographic, contextual, and sample-preparation- and measurement-related information. In the case of cosmogenic radionuclide data, OCTOPUS also includes all necessary information and input files for the recalculation of denudation rates using the open-source program CAIRN. OCTOPUS v.2 and its associated data curation framework allow for valuable legacy data to be harnessed that would otherwise be lost to the research community. The database can be accessed at https://octopusdata.org (last access: 1 July 2022). The individual data collections can also be accessed via their respective digital object identifiers (DOIs) (see Table 1).

Published
2022
Full Text
View/download PDF

27. OCTOPUS database (v.2)

Author

Codilean, Alexandru T., primary, Munack, Henry, additional, Saktura, Wanchese M., additional, Cohen, Tim J., additional, Jacobs, Zenobia, additional, Ulm, Sean, additional, Hesse, Paul P., additional, Heyman, Jakob, additional, Peters, Katharina J., additional, Williams, Alan N., additional, Saktura, Rosaria B. K., additional, Rui, Xue, additional, Chishiro-Dennelly, Kai, additional, and Panta, Adhish, additional

Published
2022
Full Text
View/download PDF

28. Dense vegetation promotes denudation in Patagonian rainforests

Author

Mohr, Christian H, primary, Tolorza, Violeta, additional, Georgieva, Viktoria, additional, Munack, Henry, additional, Wilcken, Klaus M, additional, Fülöp, Réka-Hajnalka, additional, Codilean, Alexandru T, additional, Parra, Eric, additional, and Carretier, Sebastien, additional

Published
2022
Full Text
View/download PDF

29. Technical note: Accelerator mass spectrometry of 10Be and 26Al at low nuclide concentrations

Author

Wilcken, Klaus M., Codilean, Alexandru T., Fülöp, Réka-H., Kotevski, Steven, Rood, Anna H., Rood, Dylan H., Seal, Alexander J., and Simon, Krista

Subjects
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
Abstract

Accelerator mass spectrometry (AMS) is currently the standard technique to measure cosmogenic 10Be and 26Al concentrations, but the challenge with measuring low nuclide concentrations is to combine high AMS measurement efficiency with low backgrounds. The current standard measurement setup at ANSTO uses the 3+ charge state with Ar stripper gas at 6 MV for Be and 4 MV for Al, achieving ion transmission through the accelerator for 10Be3+ and 26Al3+ of around 35 % and 40 %, respectively. Traditionally, 26Al measurement uncertainties are larger than those for 10Be. Here, however, we show that 26Al can be measured to similar precision as 10Be even for samples with 26Al / 27Al ratios in the range of 10−15, provided that measurement times are sufficiently long. For example, we can achieve uncertainties of 5 % for 26Al / 27Al ratios around 1×10-14, typical for samples of late Holocene age or samples with long burial histories. We also provide empirical functions between the isotope ratio and achievable measurement precision, which allow predictive capabilities for future projects and serve as a benchmark for inter-laboratory comparisons. For the smallest signals, not only is understanding the source of 10Be or 26Al background events required to select the most appropriate blank correction method but also the impact of the data reduction algorithms on the obtained nuclide concentration becomes pronounced. Here we discuss approaches to background correction and recommend quality assurance practices that guide the most appropriate background correction method. Our sensitivity analysis demonstrates a 30 % difference between different background correction methods for samples with 26Al / 27Al ratios below 10−14. Finally, we show that when the measured signal is small and the number of rare isotope counts is also low, differing 26Al or 10Be concentrations may be obtained from the same data if alternate data reduction algorithms are used. Differences in the resulting isotope concentration can be 50 % or more if only very few (≲ 10) counts were recorded or about 30 % if single measurement is shorter than 10 min. Our study presents a comprehensive method for analysis of cosmogenic 10Be and 26Al samples down to isotope concentrations of a few thousand atoms per gram of sample, which opens the door to new and more varied applications of cosmogenic nuclide analysis.

Published
2022

31. OCTOPUS Database v.2: The SahulArch Radiocarbon collection (v.2)

Author

Saktura, Wanchese M, Rehn, Emma, Linnenlucke, Lauren, Munack, Henry, Wood, Rachel, Petchey, Fiona, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, Ulm, Sean, Saktura, Wanchese M, Rehn, Emma, Linnenlucke, Lauren, Munack, Henry, Wood, Rachel, Petchey, Fiona, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, and Ulm, Sean

Abstract

Database of published radiocarbon ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2022

32. Rapid ice sheet response to deglacial and Holocene paleoenvironmental changes in eastern Prydz Bay, East Antarctica

Author

White, Duanne A., Fink, David, Lilly, Kat, O'Brien, Phil, Dorschel, Boris, Berg, Sonja, Bennike, Ole, Gore, Damian B., Fabel, Derek, Blaxell, Marcello, Jeromson, Matt, Codilean, Alexandru T., Wilken, Klaus M., Galton-Fenzi, Ben, Wagner, Bernd, White, Duanne A., Fink, David, Lilly, Kat, O'Brien, Phil, Dorschel, Boris, Berg, Sonja, Bennike, Ole, Gore, Damian B., Fabel, Derek, Blaxell, Marcello, Jeromson, Matt, Codilean, Alexandru T., Wilken, Klaus M., Galton-Fenzi, Ben, and Wagner, Bernd

Abstract

Prydz Bay lies at the terminus of one of East Antarctica's largest glacial systems and is a key region for understanding the response of the ice sheet to past and future environmental changes. In this study, we explore the dynamics and paleo-geometry of the ice sheet in eastern Prydz Bay, using a combination of bathymetric features on the seafloor to delineate past flow patterns, and cosmogenic nuclide dating of glacial deposits on land to constrain ice sheet terminus chronologies. Large streamlined bedforms on the sea floor record the existence of a primary ice stream in Svenner Channel, collecting ice from multiple tributary ice streams and discharging into the main trunk stream of the Lambert Glacier-Amery Ice Shelf system in Prydz Channel. The location and orientation of the north-eastern tributary to this ice stream also provide evidence for a substantial independent ice dome on the outer shelf at Four Ladies Bank. Exposure of ice-free areas at outer Rauer Group and Vestfold Hills indicates that grounding line retreat across eastern Prydz Bay was largely complete by similar to 14 ka BP, and the ice margin had retreated to within similar to 1 km of its present position by similar to 10 ka BP. Onshore moraines record periods of ice margin retreat during the middle (similar to 6 ka BP) and very late (similar to 0.5 ka BP) Holocene coinciding with local warm periods. Subsidence recorded in modern Global Navigation Satellite System (GNSS) observations suggests the regional ice sheet was smaller than at present in the period between the middle and very late Holocene advances. The unusually dynamic ice sheet behaviour in this area is attributed to the smooth, reverse-slope bed characteristics of eastern Prydz Bay, which enabled rapid retreat of the ice sheet margin several hundred kilometres during deglacial events. Crown Copyright (C) 2022 Published by Elsevier Ltd. All rights reserved.

Published
2022

33. OCTOPUS Database v.2: The SahulArch TL collection (v.2)

Author

Saktura, Wanchese M, Rehn, Emma, Munack, Henry, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, Ulm, Sean, Saktura, Wanchese M, Rehn, Emma, Munack, Henry, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, and Ulm, Sean

Abstract

Database of published thermoluminescence (TL) ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2022

34. OCTOPUS Database v.2: The SahulArch OSL collection (v.2)

Author

Saktura, Wanchese M, Rehn, Emma, Munack, Henry, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, Ulm, Sean, Saktura, Wanchese M, Rehn, Emma, Munack, Henry, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, and Ulm, Sean

Abstract

Database of published optically stimulated luminescence (OSL) ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2022

35. OCTOPUS database (v.2)

Author

Codilean, Alexandru T; https://orcid.org/0000-0003-1895-5633, Munack, Henry; https://orcid.org/0000-0002-3750-9674, Saktura, Wanchese M; https://orcid.org/0000-0002-7198-7776, Cohen, Tim J, Jacobs, Zenobia, Ulm, Sean, Hesse, Paul P, Heyman, Jakob, Peters, Katharina J; https://orcid.org/0000-0002-5967-0928, Williams, Alan N, Saktura, Rosaria B K, Rui, Xue, Chishiro-Dennelly, Kai, Panta, Adhish, Codilean, Alexandru T; https://orcid.org/0000-0003-1895-5633, Munack, Henry; https://orcid.org/0000-0002-3750-9674, Saktura, Wanchese M; https://orcid.org/0000-0002-7198-7776, Cohen, Tim J, Jacobs, Zenobia, Ulm, Sean, Hesse, Paul P, Heyman, Jakob, Peters, Katharina J; https://orcid.org/0000-0002-5967-0928, Williams, Alan N, Saktura, Rosaria B K, Rui, Xue, Chishiro-Dennelly, Kai, and Panta, Adhish

Abstract

OCTOPUS v.2 is an Open Geospatial Consortium (OGC) compliant web-enabled database that allows users to visualise, query, and download cosmogenic radionuclide, luminescence, and radiocarbon ages and denudation rates associated with erosional landscapes, Quaternary depositional landforms, and archaeological records, along with ancillary geospatial (vector and raster) data layers. The database follows the FAIR (Findability, Accessibility, Interoperability, and Reuse) data principles and is based on open-source software deployed on the Google Cloud Platform. Data stored in the database can be accessed via a custom-built web interface and via desktop geographic information system (GIS) applications that support OGC data access protocols. OCTOPUS v.2 hosts five major data collections. CRN Denudation and ExpAge consist of published cosmogenic 10Be and 26Al measurements in modern fluvial sediment and glacial samples respectively. Both collections have a global extent; however, in addition to geospatial vector layers, CRN Denudation also incorporates raster layers, including a digital elevation model, gradient raster, flow direction and flow accumulation rasters, atmospheric pressure raster, and CRN production scaling and topographic shielding factor rasters. SahulSed consists of published optically stimulated luminescence (OSL) and thermoluminescence (TL) ages for fluvial, aeolian, and lacustrine sedimentary records across the Australian mainland and Tasmania. SahulArch consists of published OSL, TL, and radiocarbon ages for archaeological records, and FosSahul consists of published late-Quaternary records of direct and indirect non-human vertebrate (mega)fauna fossil ages that have been systematically quality rated. Supporting data are comprehensive and include bibliographic, contextual, and sample-preparation- and measurement-related information. In the case of cosmogenic radionuclide data, OCTOPUS also includes all necessary information and input files for the recalculat

Published
2022

39. Rapid ice sheet response to deglacial and Holocene paleoenvironmental changes in eastern Prydz Bay, East Antarctica

Author

White, Duanne A., primary, Fink, David, additional, Lilly, Kat, additional, O'Brien, Phil, additional, Dorschel, Boris, additional, Berg, Sonja, additional, Bennike, Ole, additional, Gore, Damian B., additional, Fabel, Derek, additional, Blaxell, Marcello, additional, Jeromson, Matt, additional, Codilean, Alexandru T., additional, Wilken, Klaus M., additional, Galton-Fenzi, Ben, additional, and Wagner, Bernd, additional

Published
2022
Full Text
View/download PDF

43. Single-grain cosmogenic [sup.21]Ne concentrations in fluvial sediments reveal spatially variable erosion rates

Author

Codilean, Alexandru T., Bishop, Paul, Stuart, Finlay M., Hoey, Trevor B., Fabel, Derek, and Freeman, Stewart P.H.T.

Subjects
Landscape evolution -- Observations, River sediments -- Distribution, Beach erosion -- Research, Company distribution practices, Earth sciences
Abstract

We evaluated the hypothesis that the spatial variation in erosion in a catchment is reflected in the distribution of the cosmogenic nuclide concentrations in sediments leaving the catchment. Using published data and four new [sup.10]Be measurements in fluvial sediment collected from the outlets of small river catchments, we constrained the spatial variability of erosion rates in the Gaub River catchment in Namibia. We combined these catchment-averaged erosion rates, and the mean slope values with which they are associated, in a digital elevation model (DEM)--based analysis to predict distributions of cosmogenic [sup.21]Ne concentrations in the sediment leaving the Gaub catchment. We compared these synthetic distributions with the distribution of concentrations of cosmogenic [sup.21]Ne ([sup.21][Ne.sub.c]) in 32 quartz fluvial pebbles (16-21 mm) collected from the catchment outlet. The [sup.21] [Ne.sub.c] concentrations span nearly two orders of magnitude (2.6-160 x [10.sub.6] atoms/g) and are highly skewed toward low values. The DEM-based analysis confirms this skew--the measured [sup.21][Ne.sub.c] distribution plots within the envelope of distributions predicted for the catchment. This match between measured and synthetic [sup.21]Ne distributions implies that the measured distribution is a signature of the spatial variation in erosion rates. Keywords: [sup.21]Ne, [sup.10]Be, cosmogenic nuclides, denudation rates, slope dependence, landscape evolution.

Published
2008

44. OCTOPUS Database v.2: The SahulSed Lacustrine TL collection

Author

Cohen, Timothy J, Fu, Xiao, Price, David, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, Codilean, Alexandru T, Cohen, Timothy J, Fu, Xiao, Price, David, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, and Codilean, Alexandru T

Abstract

Database of published thermoluminescence (TL) ages for lacustrine sedimentary records from Sahul. Spatial data includes sample locations (point) and uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2021

45. OCTOPUS Database v.2: The SahulArch Radiocarbon collection

Author

Saktura, Wanchese M, Munack, Henry, Codilean, Alexandru T, Wood, Rachel, Petchey, Fiona, Jacobs, Zenobia, Williams, Alan, Ulm, Sean, Saktura, Wanchese M, Munack, Henry, Codilean, Alexandru T, Wood, Rachel, Petchey, Fiona, Jacobs, Zenobia, Williams, Alan, and Ulm, Sean

Abstract

Database of published radiocarbon ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2021

46. OCTOPUS Database v.2: The SahulSed Fluvial TL collection

Author

Cohen, Timothy J, Saktura, Wanchese M, Jansen, John D, Price, David, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, Codilean, Alexandru T, Cohen, Timothy J, Saktura, Wanchese M, Jansen, John D, Price, David, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, and Codilean, Alexandru T

Abstract

Database of published thermoluminescence (TL) ages for fluvial sedimentary records from Sahul. Spatial data includes sample locations (point) and uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2021

47. OCTOPUS Database v.2: The CRN Denudation Global collection

Author

Codilean, Alexandru T, Munack, Henry, Codilean, Alexandru T, and Munack, Henry

Abstract

Database of published cosmogenic Be-10 and Al-26 concentrations from modern river sediment and basin-averaged denudation rates inferred from these data. Ancillary spatial data includes: sample site location (point), basin outline (polygon), digital elevation model (raster), D8 flow direction and flow accumulation grids (raster), topographic gradient (raster), atmospheric pressure (raster), and cosmogenic nuclide production scaling factor and topographic shielding grids (raster). The vector spatial data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. The raster data uses the WGS86/UTM projected coordinate reference system, UTM zones depending on the extent and location of each data package. Sample metadata is comprehensive and includes all necessary information and input files for the recalculation of denudation rates using the CAIRN model (https://github.com/LSDtopotools/LSDTopoTools_CRNBasinwide). All denudation rates were recalculated and harmonised using CAIRN. The extent of the data is global, excluding Australia.

Published
2021

48. OCTOPUS Database v.2: The SahulSed Aeolian OSL collection

Author

Cohen, Timothy J, Fu, Xiao, Hesse, Paul, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, Codilean, Alexandru T, Cohen, Timothy J, Fu, Xiao, Hesse, Paul, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, and Codilean, Alexandru T

Abstract

Database of published optically stimulated luminescence (OSL) ages for aeolian sedimentary records from Sahul. Spatial data includes sample locations (point) and uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2021

49. OCTOPUS Database v.2: The SahulSed Aeolian TL collection

Author

Cohen, Timothy J, Fu, Xiao, Hesse, Paul, Price, David, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, Codilean, Alexandru T, Cohen, Timothy J, Fu, Xiao, Hesse, Paul, Price, David, Rui, Xue, Saktura, Rosaria B.K, Munack, Henry, and Codilean, Alexandru T

Abstract

Database of published thermoluminescence (TL) ages for aeolian sedimentary records from Sahul. Spatial data includes sample locations (point) and uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2021

50. OCTOPUS Database v.2: The SahulArch TL collection

Author

Saktura, Wanchese M, Munack, Henry, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, Ulm, Sean, Saktura, Wanchese M, Munack, Henry, Codilean, Alexandru T, Jacobs, Zenobia, Williams, Alan, and Ulm, Sean

Abstract

Database of published thermoluminescence (TL) ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results