ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Elsevier  (5,804,770)
  • PANGAEA  (422,945)
Collection
Keywords
Publisher
Language
Years
  • 1
    facet.materialart.
    Unknown
    Recycled materials and secondary processes controlled the chemical and isotopic compositions of bubbling gases discharged from two adjacent geothermal springs in the Northern Luzon Arc (2024)
    Elsevier
    Details
    Publication Date: 2024-06-12
    Description: Highlights • Statistically different gas geochemistry was observed in two adjacent springs. • About 74% of helium was contributed by the mantle. • Excess N2 relative to Ar was attributed to subducted materials and seawater mixing. • Magmatic CO2 has been largely removed by calcite precipitation in the reaction zone. • The residual CO2 may also be supplied by microbial oxidation of alkanes. Gas emissions from hydrothermal systems can serve as indicators of subsurface activity. In addition to gas sources, hydrothermal gas geochemistry is strongly influenced by secondary processes that occur during/after hydrothermal circulation. Here, we observed statistically significant differences in the geochemical characteristics (except for helium isotopes) of bubbling gases discharged from two adjacent vents in the Northern Luzon Arc. Helium (3He/4He = 4.25–7.09 Ra) in both vents was controlled by mixing between mantle and crustal components, where about 74% of helium was contributed by the mantle. Differences in N2/Ar ratios (∼ 300–330) of the two neighboring springs are attributed to subducted materials and seawater mixing (contributing ∼2.5% N2 and Ar), rather than phase separation in the reaction zone. Specifically, Ar was mainly supplied by atmospheric components that dissolved in the percolated seawater with only 8%–9% contributed by the excess radiogenic 40Ar. Excess N2 relative to Ar was mainly supplied by the decomposition of subducted materials (83%–92%) of the South China Sea plate beneath the Philippine Sea Plate. The Lutao gases showed low CO2 concentrations (0.07–22.2 mmol/mol), despite the high 3He/4He ratios indicating a significant contribution of magmatic components. Magmatic CO2 may have been largely consumed by the high Ca Lutao vent fluids via carbonate precipitation in the reaction zone. Alternatively, stable carbon isotope compositions (δ13C) indicate that Lutao CO2 may be supplied by microbial oxidation of alkanes (e.g., CH4 with concentrations of 14.6–173 mmol/mol in the samples), with fractionation factor ΔCO2–CH4 ranging from −15‰ to −25‰ and conversion rates of 〈10%. Up to 65% of the CO2 in the 2016 samples experienced secondary calcite precipitation in the discharge zone. Our results indicate that recycled subducted materials could potentially affect the geochemical characteristics of gases discharged from arc-volcanic systems. In addition, the influence of secondary processes needs to be considered before tracing the sources of hydrothermal fluids and/or gases, especially in shallow-water hydrothermal systems.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OCEANREP)
  • 2
    facet.materialart.
    Unknown
    Cross-shelf transport of high chlorophyll-a coastal waters by frontal eddies in the south of Java sea (2024)
    Elsevier
    Details
    Publication Date: 2024-06-12
    Description: Highlights: • A cyclonic frontal eddy emerged near the South Java Coast (SJC) in 2019. • The cyclonic eddy induces filaments of Chl-a, cold water, and nutrients. • Anti-cyclonic eddies distribute the filaments further offshore. • The role of wind can't be ignored in distributing filaments in the SJC. • We propose a three-stage mechanism for Chl-a distribution in the offshore SJC. Intense mesoscale eddy activity has been observed off the southern Java coast (SJC), yet its impact on local ecosystems remains largely unknown. To investigate this, we examined remotely sensed altimetry, chlorophyll-a (Chl-a), and sea surface temperature (SST) data, focusing on their response to eddies in the region. Our eddy detection and tracking analysis revealed a unique cyclonic frontal eddy near the SJC coast and a large anticyclonic eddy offshore, active from July to September 2019. The cyclonic frontal eddy induced water transport through eddy filaments, upwelled subsurface cold water, and enhanced Chl-a concentrations by horizontally entraining Chl-a-rich shelf water offshore. The anticyclonic eddy then contributed to further distributing this enriched water southward. The mean cross-shelf transport associated with the frontal eddy was estimated at 1.80–2.33 Sv offshore, exporting approximately 1.87–2.40 × 103 tons of Chl-a to the Indian Ocean during its lifetime. Additionally, the spatial cross-correlation analysis of zonal and meridional wind stress with Chl-a revealed relatively high correlation values (0.6–1) and short lag times (〈5 days) in offshore areas, indicating that the role of wind in the Chl-a advection cannot be ignored. We propose a three-stage mechanism to explain the presence of high Chl-a offshore:1) Wind-driven upwelling intensifies coastal nutrients, elevating Chl-a concentrations in coastal waters, 2) Frontal cyclonic eddy facilitates the retention and offshore export of these upwelling-enriched waters. and 3) Anticyclonic eddy advects these nutrient-rich waters further south. The combination of enhanced coastal upwelling and eddies can explain nutrient-rich coastal waters in offshore regions
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OCEANREP)
  • 3
    facet.materialart.
    Unknown
    Late-Pleistocene rejuvenated volcanism and flank collapse deposits on a Cretaceous seamount near El Hierro, Canary Archipelago (2024)
    Elsevier
    Details
    Publication Date: 2024-06-12
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    Format: other
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OCEANREP)
  • 4
    facet.materialart.
    Unknown
    Insights into the explosive eruption history of the Campanian volcanoes prior to the Campanian Ignimbrite eruption (2024)
    Elsevier
    Details
    Publication Date: 2024-06-12
    Description: The Campanian Volcanic Zone (CVZ) comprises multiple active volcanoes and includes the highly productive Campi Flegrei and Ischia caldera systems. These caldera volcanoes have produced probably the largest eruptions in Europe in the past 200 ka, such as the Monte Epomeo Green Tuff (MEGT; Ischia) at ca. 56 ka and the Campanian Ignimbrite (CI; Campi Flegrei) at ca. 40 ka, which form widespread isochrons across the Mediterranean region. These closely-spaced volcanic centres erupt phonolitic to trachytic glass compositions that are similar, and thus it can be challenging to correlate tephra deposits to specific volcanic sources. Here we present a detailed tephrostratigraphy for pre-CI eruption activity using the units preserved within a sequence at the coastal Acquamorta outcrop, on the western side of the CI caldera rim. Both the MEGT and CI units are present in the section, and they bracket twelve eruption units that were logged and sampled. New major and trace element glass chemistry data have been acquired for these Acquamorta tephra deposits. Three eruption deposits from Ischia and nine from Campi Flegrei are identified, which helps constrain the tempo of volcanic activity of these centres between the large caldera-forming eruptions. The three Ischia tephra deposits between the MEGT and the CI are indistinguishable based on both major and trace element glass chemistry and cannot be correlated to a specific or known eruption in this interval, such as the Schiappone tephra. The compositional variations between the Campi Flegrei eruptions reveal temporal shifts in the composition of the tephra deposits that reflect changes in the magmatic system prior to the CI eruption. These deposits indicate that there were at least nine eruptions at Campi Flegrei within 16 ka of the enormous CI eruption, and suggest that there was no significant period of repose before the caldera generating eruption.
    Description: Published
    Description: 107915
    Description: OSV2: Complessità dei processi vulcanici: approcci multidisciplinari e multiparametrici
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 5
    facet.materialart.
    Unknown
    Impacts of volcanic hazards on rural communities and adaptative strategies: A case study of the Virunga Volcanic Province (Democratic Republic of Congo) (2024)
    Elsevier
    Details
    Publication Date: 2024-06-12
    Description: Active volcanoes are a continuous threat for several regions worldwide and cause socio-economic and environmental issues, including the Virunga Volcanic Province (D.R. Congo). There, more than 2 million people are permanently exposed to the hazards of the most active volcanoes in Africa: Nyiragongo and Nyamulagira. However, there is a clear lack of information regarding the impacts of these hazards and how they may be affected by social vulnerability. In this study, a household survey based on semi-structural interviews was performed for rural communities in Virunga. This research aims to (i) investigate the impacts of volcanic hazards on rural communities facing distinct levels of social vulnerability, (ii) understand the adaptive strategies developed by these communities to address these impacts, and finally (iii) identify the main grievances with respect to volcanic hazards raised by these rural communities. The most vulnerable households are those directly affected by volcano-tectonic hazards such as lava flows, mazukus, volcanic gases, ash fallout, and seismic activity. Indirect dangers related to water and food contamination by volcanic emissions are also stronger for the most vulnerable households. Respondents reported that most edible plants and waters are strongly affected by direct volcanic emissions. Drinking waters, which come from traditional drainage, rainfall, and streams, are generally not suitable for human consumption in the study area. Community suggestions for addressing issues related to volcanic-tectonic hazards include efforts to improve water and food quality, enhancement of the sanitary system, timely information on the volcanic activity, volcano monitoring, and capacity building for volcanologists.
    Description: Published
    Description: 103566
    Description: JCR Journal
    Keywords: Volcanic hazards ; Social vulnerability ; Risks perception ; Nyiragongo ; Nyamulagira
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 6
    facet.materialart.
    Unknown
    Fault rupture and aseismic creep accompanying the December 26, 2018, Mw 4.9 Fleri earthquake (Mt. Etna, Italy): Factors affecting the surface faulting in a volcano-tectonic environment (2024)
    Elsevier
    Details
    Publication Date: 2024-06-12
    Description: On December 26, 2018 (2:19 UTC), during a volcanic eruption on the Mt. Etna eastern flank (Sicily, southern Italy), the largest instrumental earthquake ever recorded in the volcano ruptured the Fiandaca Fault, with epicenter between Fleri and Pennisi villages (hypocenter at ca. 300 m a. s. l., Mw 4.9). This was the mainshock of an earthquake swarm and it was accompanied by widespread surface faulting and extensive damage along a narrow belt near the fault trace. Few hours after the mainshock, an episodic aseismic creep event occurred along the Aci Platani Fault, a SE extension of the Fiandaca Fault, which caused several damages in the Aci Platani village. We surveyed and mapped the coseismic and aseismic ground ruptures, and collected structural data on their geometry, displacement, and fault zone fabric. We compared the mapped surface ruptures with topography, lithology, and morphology of the buried top of the sedimentary basement. We conclude that the geometry of the volcanic pile influenced the surface expression of faulting during the December 26, 2018 event. The top surface of the marly clay basement should be considered as a detachment surface for shallow sliding blocks. The earthquake occurred on top of a depression of the sedimentary basement forcing the sliding eastward, causing at surface the re-arrangement of the fault strand pattern and deformation style, switching from shear faulting to a tensile failure. The Fleri earthquake therefore provides an unprecedented dataset for 1) understanding active faulting in the European largest onshore volcano, 2) modeling its complex dynamics, and 3) contributing to a more refined surface faulting hazard assessment at Mt. Etna. Results from this investigation might be useful for characterizing capable faulting in similar volcano-tectonic settings worldwide.
    Description: Published
    Description: 25-41
    Description: JCR Journal
    Keywords: 2018 Fleri earthquake ; Mt. Etna ; Surface faulting ; Geological hazards ; Aseismic creep
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 7
    facet.materialart.
    Unknown
    Ground-based electromagnetic (EM) and drill-hole ice and snow thickness and melt pond depth measurements during Polarstern cruise ARK-IX/4, ARK-XI/1, and ARK-XII (1997)
    PANGAEA
    In:  Supplement to: Haas, Christian; Gerland, Sebastian; Eicken, Hajo; Miller, Heinz (1997): Comparison of sea-ice thickness measurements under summer and winter conditions in the Arctic using a small electromagnetic induction device. Geophysics, 62(3), 749-757, https://doi.org/10.1190/1.1444184
    Details
    Publication Date: 2024-06-12
    Description: Drillhole-determined sea-ice thickness was compared with values derived remotely using a portable small-offset loop-loop steady state electromagnetic (EM) induction device during expeditions to Fram Strait and the Siberian Arctic, under typical winter and summer conditions. Simple empirical transformation equations are derived to convert measured apparent conductivity into ice thickness. Despite the extreme seasonal differences in sea-ice properties as revealed by ice core analysis, the transformation equations vary little for winter and summer. Thus, the EM induction technique operated on the ice surface in the horizontal dipole mode yields accurate results within 5 to 10% of the drillhole determined thickness over level ice in both seasons. The robustness of the induction method with respect to seasonal extremes is attributed to the low salinity of brine or meltwater filling the extensive pore space in summer. Thus, the average bulk ice conductivity for summer multiyear sea ice derived according to Archie's law amounts to 23 mS/m compared to 3 mS/m for winter conditions. These mean conductivities cause only minor differences in the EM response, as is shown by means of 1-D modeling. However, under summer conditions the range of ice conductivities is wider. Along with the widespread occurrence of surface melt ponds and freshwater lenses underneath the ice, this causes greater scatter in the apparent conductivity/ice thickness relation. This can result in higher deviations between EM-derived and drillhole determined thicknesses in summer than in winter.
    Keywords: Arctic Ocean; Ark11_203p1; Ark11_205p1; Ark11_205p2; Ark11_206p1; Ark11_207p1; Ark11_209p1; Ark11_210p1; Ark11_216p1; Ark11_219p1; Ark11_219p3; Ark11_221p1; Ark11_228p1; Ark11_229p1; Ark11_230p1; Ark11_232p1; Ark11_232p2; Ark11_233p1; Ark11_234p1; Ark11_235p1; Ark11_236p1; Ark11_237p1; Ark11_237p2; Ark11_238p1; Ark11_239p1; Ark11_240p1; Ark11_241p1; Ark11_242p1; Ark11_243p1; Ark11_247p1; Ark12_207p1; Ark12_207p2; Ark12_208p1; Ark12_209p1; Ark12_210p1; Ark12_212p1; Ark12_212p2; Ark12_213p1; Ark12_214p1; Ark12_215p1; Ark12_216p1; Ark12_218p1; Ark12_219p1; Ark12_220p1; Ark12_221p1; Ark12_222p1; Ark12_223p1; Ark12_226p1; Ark12_227p1; Ark12_229p1; Ark12_230p1; Ark12_231p1; Ark12_232p1; Ark12_232p2; Ark12_232p3; Ark12_233p1; Ark12_234p1; Ark12_236p1; Ark12_236p2; Ark12_238p1; Ark12_239p1; Ark12_240p1; Ark12_240p2; Ark12_240p3; Ark12_240p4; Ark12_240p5; Ark12_240p6; Ark12_240p7; Ark12_242p1; Ark12_243p1; Ark12_246p1; Ark12_247p1; Ark12_249p1; Ark9_4_246p1; Ark9_4_251p1; Ark9_4_253p1; Ark9_4_254p1; Ark9_4_255p1; Ark9_4_256p1; Ark9_4_257p1; Ark9_4_258p1; Ark9_4_260p1; Ark9_4_261p1; Ark9_4_264p1; ARK-IX/4; ARK-XI/1; ARK-XII; AWI_SeaIce; East Siberian Sea; FEME; ICEM; Ice measurement; Kara/Laptev Sea/Transpolar Drift; Laptev Sea; Polarstern; PS27; PS36; PS41; Remote Sensing of Sea Ice Properties; Sea Ice Physics @ AWI
    Type: Dataset
    Format: application/zip, 83 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 8
    facet.materialart.
    Unknown
    Ground-based electromagnetic (EM) and drill-hole ice and snow thickness measurements during Polarstern cruise ARK-XVII/2 in 2001 (2004)
    PANGAEA
    In:  Supplement to: Haas, Christian (2004): Late-summer sea ice thickness variability in the Arctic Transpolar Drift 1991-2001 derived from ground-based electromagnetic sounding. Geophysical Research Letters, 31, L09402, https://doi.org/10.1029/2003GL019394
    Details
    Publication Date: 2024-06-12
    Description: Late-summer thickness distributions of large ice floes in the Transpolar Drift between Svalbard and the North Pole in 1991, 1996, 1998, and 2001 are compared. They have been derived from drilling and electromagnetic (EM) sounding. Results show a strong interannual variability, with significantly reduced thickness in 1998 and 2001. The mean thickness decreased by 22.5% from 3.11 m in 1991 to 2.41 m in 2001, and the modal thickness by 22% from 2.50 m in 1991 to 1.95 m in 2001. Since modal thickness represents the thickness of level ice, the observed thinning reflects changes in thermodynamic conditions. Together with additional data from the Laptev Sea obtained in 1993, 1995, and 1996, results are in surprising agreement with recently published thickness anomalies retrieved from satellite radar altimetry for Arctic regions south of 81.5°N. This points to a strong sensitivity of radar altimetry data to level ice thickness.
    Keywords: Arctic Ocean; Ark17_216p1; Ark17_217p1; Ark17_218p1; Ark17_219p1; Ark17_220p1; Ark17_221p1; Ark17_222p1; Ark17_223p1; Ark17_223p2; Ark17_224p1; Ark17_225p1; Ark17_226p1; Ark17_227p1; Ark17_228p1; Ark17_229p1; Ark17_230p1; Ark17_231p1; Ark17_232p1; Ark17_233p1; Ark17_234p1; Ark17_235p1; Ark17_237p1; Ark17_238p1; Ark17_239p1; Ark17_240p1; Ark17_241p1; Ark17_242p1; Ark17_243p1; Ark17_244p1; Ark17_245p1; Ark17_246p1; Ark17_247p1; Ark17_248p1; Ark17_249p1; Ark17_250p1; Ark17_251p1; Ark17_253p1; Ark17_254p1; Ark17_256p1; Ark17_257p1; Ark17_258p1; Ark17_260p1; Ark17_261p1; Ark17_262p1; Ark17_263p1; Ark17_264p1; Ark17_265p1; Ark17_266p1; Ark17_267p1; Ark17_269p1; Ark17_269p5; Ark17_270p1; Ark17_270p3; Ark17_270p6; ARK-XVII/2; AWI_SeaIce; FEME; ICEM; Ice measurement; Polarstern; PS59 AMORE; Remote Sensing of Sea Ice Properties; Sea Ice Physics @ AWI
    Type: Dataset
    Format: application/zip, 54 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 9
    facet.materialart.
    Unknown
    Pigment concentrations in surface sediments of the Arabian Sea (2000)
    PANGAEA
    In:  Supplement to: Pfannkuche, Olaf; Sommer, Stefan; Kähler, A (2000): Coupling between phytodetritus and the small-sized benthic biota in the deep Arabian Sea: analyses of biogenic sediment compound. Deep Sea Research Part II: Topical Studies in Oceanography, 47(14), 2805-2833, https://doi.org/10.1016/S0967-0645(00)00050-3
    Details
    Publication Date: 2024-06-12
    Description: As part of the large-scale, interdisciplinary deep-sea study "BIGSET", the relationship between the monsoon-induced regional and temporal variability of POC deposition and the small-sized benthic community was investigated at several sites 2316-4420 m deep in the Arabian Sea during four cruises between 1995 and 1998. Vertical and horizontal distribution patterns of chloroplastic pigments (a measure of phytodetritus deposition), readily soluble protein and activity, and biomass parameters of the small-sized benthic community (Electron Transport System Activity (ETSA); bacterial ectoenzymatic activity (FDA turnover) and DNA concentrations) were measured concurrently with the vertical fluxes of POC and chloroplastic pigments. Sediment chlorophyll a (chl. a) profiles were used to calculate chl. a flux rates and to estimate POC flux across the sediment water interface using two different transport reaction models. These estimates were compared with corresponding flux rates determined in sediment traps. Regional variability of primary productivity and POC deposition at the deep-sea floor creates a trophic gradient in the Arabian Basin from the NW to the SE, which is primarily related to the activity of monsoon winds and processes associated with the topography of the Arabian Basin and the vicinity of land masses. Inventories of sediment chloroplastic pigments closely corresponded to this trophic gradient. For ETSA, FDA and DNA, however, no clear coupling was found, although stations WAST (western Arabian Sea) and NAST (northern Arabian Sea) were characterised by high concentrations and activities. These parameters exhibited high spatial and temporal variability, making it impossible to recognise clear mechanisms controlling temporal and spatial community patterns of the small-sized benthic biota. Nevertheless, the entire Arabian Basin was recognised as being affected by monsoonal activity. Comparison of two different transport reaction models indicates that labile chl. a buried in deeper sediment layers may escape rapid degradation in Arabian deep-sea sediments.
    Keywords: 109, M31/3-109_MC2; 11#1; 11#2; 110#1, M31/3-110.1_MC2; 110#2, M31/3-110.2_MC2; 110#3, M31/3-110.3_MC1; 110#4, M31/3-110.4_MC3; 13#3; 19#2; 19#7; 19#9; 22#1; 24#1; 26; 3; 30#4; 31#9; 34#1; 35#4; 36#2; 36#3; 41; 43#4; 46; 49#1; 49#8; 50#1; 54; 58#3, CAST; 581; 585; 587; 6#2; 60#3; 603; 611; 614; 633; 637; 641, CAST; 655; 661; 662; 666; 668; 67#1; 671; 70#3, NAST; 73#1; 76#2; 80; 85#1; 88#1; 9#2; 9#4; Arabian Sea; BIGSET; BIGSET-1; BIGSET-2/JGOFS-IN-4; Biogeochemical Fluxes of Matter and Energy in the Deep Sea; Central Arabian Sediment Trap; Eastern Arabian Sediment Trap; M31/3; M31/3_MC-02; M31/3_MC-05; M31/3_MC-07; M31/3_MC-10; M31/3_MC-12; M31/3_MC-15; M31/3_MC-17; M31/3-108_MC1/1, 108; M31/3-112_MC1, MC377, GeoB3010-3; M33/1; M33/1_MC-01; M33/1_MC-04; M33/1_MC-06; M33/1_MC-08; M33/1_MC-10; M33/1_MC-12; M33/1_MC-16; M33/1_MC-18; M33/1_MC-21; M33/1_MC-22; M33/1_MC-24; M33/1_MC-26; M33/1_MC-29; M33/1_MC-31; M33/1_MC-34; Meteor (1986); MUC; MultiCorer; Northern Arabian Sediment Trap; Northern Arabian Sediment Trap/Western Arabian Sediment Trap; SO118; SO118_MC-07; SO118_MC-08; SO118_MC-09; SO118_MC-10; SO118_MC-12; SO118_MC-14; SO118_MC-19; SO118_MC-20; SO118_MC-22; SO118_MC-24; SO118_MC-27; SO118_MC-30; SO118_MC-33; SO118_MC-35; SO118_MC-37; SO118_MC-39; SO118_MC-43; SO118_MC-44; SO118_MC-45; SO118_MC-47; SO118_MC-48; SO118_MC-50; SO129; SO129_MC-01; SO129_MC-04; SO129_MC-06; SO129_MC-08; SO129_MC-10; SO129_MC-11; SO129_MC-13; SO129_MC-15; SO129_MC-17; SO129_MC-18; SO129_MC-20; SO129_MC-21; SO129_MC-23; Sonne; Southern Arabian Sediment Trap; Southern Arabian Sediment Trap/Eastern Arabian Sediment Trap; Southern Arabian Sediment Trap/Western Arabian Sediment Trap; Western Arabian Sediment Trap; Western Arabian Sediment Trap/Central Arabian Sediment Trap; Western Arabian Sediment Trap/Southern Arabian Sediment Trap; Western Arabian Sediment Trap-Kuppe; Western Arabian Sediment Trap Plain; Western Arabian Sediment Trap Top
    Type: Dataset
    Format: application/zip, 57 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 10
    facet.materialart.
    Unknown
    Living benthic foraminiferal assemblages in surface samples of the Arabian Sea (2000)
    PANGAEA
    In:  Supplement to: Kurbjeweit, Frank; Schmiedl, Gerhard; Schiebel, Ralf; Hemleben, Christoph; Pfannkuche, Olaf; Wallmann, Klaus; Schäfer, Priska (2000): Distribution, biomass and diversity of benthic foraminifera in relation to sediment geochemistry in the Arabian Sea. Deep Sea Research Part II: Topical Studies in Oceanography, 47(14), 2913-2955, https://doi.org/10.1016/S0967-0645(00)00053-9
    Details
    Publication Date: 2024-06-12
    Description: The distribution, biomass, and diversity of living (Rose Bengal stained) deep-sea benthic foraminifera (〉30 µm) were investigated with multicorer samples from seven stations in the Arabian Sea during the intermonsoonal periods in March and in September/October, 1995. Water depths of the stations ranged between 1916 and 4425 m. The distribution of benthic foraminifera was compared with dissolved oxygen, % organic carbon, % calcium carbonate, ammonium, % silica, chloroplastic pigment equivalents, sand content, pore water content of the sediment, and organic carbon flux to explain the foraminiferal patterns and depositional environments. A total of six species-communities comprising 178 living species were identified by principal component analysis. The seasonal comparison shows that at the western stations foraminiferal abundance and biomass were higher during the Spring Intermonsoon than during the Fall Intermonsoon. The regional comparison indicates a distinct gradient in abundance, biomass, and diversity from west to east, and for biomass from north to south. Highest values are recorded in the western part of the Arabian Sea, where the influence of coastal and offshore upwelling are responsible for high carbon fluxes. Estimated total biomass of living benthic foraminifera integrated for the upper 5 cm of the sediment ranged between 11 mg Corg m**-2 at the southern station and 420 mg Corg m**-2 at the western station. Foraminifera in the size range from 30 to 125 ?m, the so-called microforaminifera, contributed between 20 and 65% to the abundance, but only 3% to 28% to the biomass of the fauna. Highest values were found in the central and southern Arabian Sea, indicating their importance in oligotrophic deep-sea areas. The overall abundance of benthic foraminifera is positively correlated with oxygen content and pore volume, and partly with carbon content and chloroplastic pigment equivalents of the sediment. The distributional patterns of the communities seem to be controlled by sand fraction, dissolved oxygen, calcium carbonate and organic carbon content of the sediment, but the critical variables are of different significance for each community.
    Keywords: 110, M31/3_MC376, WAST; 581, NAST; 621, WAST-T; 622, WAST; 640, CAST; 661, EAST; 666, SAST; Arabian Sea; BIGSET; Biogeochemical Fluxes of Matter and Energy in the Deep Sea; Central Arabian Sediment Trap; Eastern Arabian Sediment Trap; M31/3; M31/3_111#1,GeoB3007-3,WAST-T; M31/3_111#2,GeoB3008-5,WAST-Flank; M31/3_MC-08; M31/3_MC-11; M31/3-110.4_MC1; M33/1; M33/1_MC-03; M33/1_MC-13; M33/1_MC-15; M33/1_MC-19; M33/1_MC-25; M33/1_MC-30; Meteor (1986); MUC; MultiCorer; Northern Arabian Sediment Trap; Southern Arabian Sediment Trap; Western Arabian Sediment Trap
    Type: Dataset
    Format: application/zip, 33 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...