Der Wärmehaushalt periglazialer Hochgebirgsböden – Zusammenhänge zwischen Bodentiefe und Frostwechseln (Nördlicher Tian Shan, Kasachstan)

Ganzjährige Bodentemperaturmessungen wurden zwischen den Sommern der Jahre 2003 und 2004 an elf verschiedenen Standorten eines Hochgebirgstales im Zailijskij Alatau (Nördlicher Tian Shan, Kasachstan) durchgeführt. Die periglaziale Höhenstufe – hier, an der Nordabdachung des Gebirges in der Höhe von ca. 2.700 bis 3.750 m ü. NN – sowie deren überlappungsbereiche mit den sich vertikal anschließenden Höhenstufen wurden zwischen 2.500 und 4.000 m ü. NN mit einer Äquidistanz von 250 Höhenmetern bemessen. Die Messungen dienen der Untersuchung des Bodenwärmehaushalts periglazialer Böden im Hochgebirge. Hierfür wurden die Höhenlage und die Exposition der Messstandorte, die Messtiefe und andere assoziierte Faktoren erfasst und zueinander in Beziehung gesetzt. Die Ergebnisse der Messungen geben Auskunft über die Häufigkeit und Standortabhängigkeit von Frostwechseln. Hierdurch können Ableitungen zu deren Intensität und morphologischer Wirksamkeit getroffen werden.researc

OCTOPUS: an open cosmogenic isotope and luminescence database

We present a database of cosmogenic radionuclide and luminescence measurements in fluvial sediment. With support from the Australian National Data Service (ANDS) we have built infrastructure for hosting and maintaining the data at the University of Wollongong and making this available to the research community via an Open Geospatial Consortium (OGC)-compliant web service. The cosmogenic radionuclide (CRN) part of the database consists of 10Be and 26Al measurements in modern fluvial sediment samples from across the globe, along with ancillary geospatial vector and raster layers, including sample site, basin outline, digital elevation model, gradient raster, flow-direction and flow-accumulation rasters, atmospheric pressure raster, and CRN production scaling and topographic shielding factor rasters. Sample metadata are comprehensive and include all necessary information for the recalculation of denudation rates using CAIRN, an open-source program for calculating basin-wide denudation rates from 10Be and 26Al data. Further all data have been recalculated and harmonised using the same program. The luminescence part of the database consists of thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements in fluvial sediment samples from stratigraphic sections and sediment cores from across the Australian continent and includes ancillary vector and raster geospatial data. The database can be interrogated and downloaded via a custom-built web map service. More advanced interrogation and exporting to various data formats, including the ESRI Shapefile and Google Earth\u27s KML, is also possible via the Web Feature Service (WFS) capability running on the OCTOPUS server. Use of open standards also ensures that data layers are visible to other OGC-compliant data-sharing services. OCTOPUS and its associated data curation framework provide the opportunity for researchers to reuse previously published but otherwise unusable CRN and luminescence data. This delivers the potential to harness old but valuable data that would otherwise be lost to the research community

OCTOPUS database (v.2)

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)

OCTOPUS Database v.2: The CRN Denudation Global collection

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

OCTOPUS Database v.2: The CRN Denudation Australian collection

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

Himalayan denudation: noise vs. time

Geophysical Research Abstracts of EGU General Assembly 2014, held 27 April - 2 May, 2014 in Vienna, Austria

OCTOPUS - CRN Australia

Compilation of published cosmogeninc Be-10 and Al-26 (where available) denudation rates along with all ancillary GIS vector (sample site and basin outline) and raster (DEM, D8 flow direction, D8 flow accumulation, topographic gradient, atmospheric pressure, production scaling, and topographic shielding) layers. Sample metadata is comprehensive and includes all necessary information for the recalculation of denudation rates using the CAIRN open source denudation rate code (https://github.com/LSDtopotools/LSDTopoTools_CRNBasinwide). Further all data have been recalculated and harmonised using the same code. The extent of the data is limited to the Australian continent. Development funding for this dataset was received from Australian National Data Service (ANDS) High Value Collections

OCTOPUS - CRN International

Compilation of published cosmogeninc Be-10 and Al-26 (where available) denudation rates along with all ancillary GIS vector (sample site and basin outline) and raster (DEM, D8 flow direction, D8 flow accumulation, topographic gradient, atmospheric pressure, production scaling, and topographic shielding) layers. Sample metadata is comprehensive and includes all necessary information for the recalculation of denudation rates using the CAIRN open source denudation rate code (https://github.com/LSDtopotools/LSDTopoTools_CRNBasinwide). Further all data have been recalculated and harmonised using the same code. The extent of the data is global, excluding Australia. Development funding for this dataset was received from Australian National Data Service (ANDS) High Value Collections

Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River

Rivers draining the semiarid Transhimalayan Ranges at the western Tibetan Plateau margin underwent alternating phases of massive valley infill and incision in Pleistocene times. The effects of these cut-and-fill cycles on millennial sediment fluxes have remained largely elusive. We investigate the timing and geomorphic consequences of headward incision of the Zanskar River, a tributary to the Indus, which taps the \u3e250-m thick More Plains valley fill that currently plugs the endorheic high-altitude basins of Tso Kar and Tso Moriri. In situ 10Be exposure dating and topographic analyses show that a phase of valley infill gave way to net dissection and the NW Himalaya\u27s first directly dated stream capture in late Marine Isotope Stage (MIS) 6, ∼135 ka ago. Headwaters of the Indus are currently capturing headwaters of the Sutlej, and rivers have eroded \u3e14.7 km3 of sediment from the Zanskar headwaters since, mobilising an equivalent of ∼8% of the Indus\u27 contemporary sediment storage volume from only 0.3% of its catchment area. The resulting specific sediment yields are among the rarely available rates averaged over the 105-yr timescale, and surpass 10Be-derived denudation rates from neighbouring catchments three- to tenfold. We conclude that recycling of Pleistocene valley fills has fed Transhimalayan headwaters with more sediment than liberated by catchment denudation, at least since the last glacial cycle began. This protracted release of sediment from thick Pleistocene valley fills might bias estimates of current sediment loads and long-term catchment denudation

OCTOPUS - OSL/TL Australia

Compilation of published OSL and TL ages along with ancillary GIS vector (sample site and basin outline) and raster (DEM, D8 flow direction, D8 flow accumulation, topographic gradient) layers. The extent of the data is limited to the Australian continent. Development funding for this dataset was received from Australian National Data Service (ANDS) High Value Collections