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  • 1
    Online Resource
    Online Resource
    The Late Quaternary History of the South Asian Monsoon (2017)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Südasien ; Holozän ; Monsun
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-197305
    URL: http://d-nb.info/1123572151/34
    URL: http://macau.uni-kiel.de/receive/dissertation_diss_00019730
    URN: urn:nbn:de:gbv:8-diss-197305
    DDC: 550
    Language: English
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  • 2
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    Relative proportions of smectite and illite, and illite-smectite oxygen-isotope compositions (δ18OI-S) of 39 mudstone samples collected from a lacustrian section at Paleolake Olduvai (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Most clay minerals in sedimentary environments have traditionally been considered to be of detrital origin, but under certain conditions, authigenic clay minerals can form at low temperature through the transformation of precursor clays or as direct precipitates from lake-water. Such clay minerals can hold important information about the prevailing climatic conditions during the time of deposition. We present the first quantitative reconstruction of salinity in paleolake Olduvai based on the oxygen-isotope composition of authigenic clay minerals. We provide a framework illustrating that the isotopic signature of authigenic lacustrine clay minerals is related to the isotopic composition of paleo-waters, and hence to paleosalinity. This new paleosalinity proxy shows that the early Pleistocene East African monsoon was driven by combinations of precession and obliquity forcing, and subsequent changes in tropical SSTs. Such quantitative lacustrine paleosalinity estimates provides a new direction of research for modeling ecosystem change based on an ecologically relevant parameter.
    Keywords: Africa, Tanzania; Age model; HAND; Illite; Olduvai-Paleolake; Sample ID; Sampling by hand; Smectite; δ18O, illite-smectite
    Type: Dataset
    Format: text/tab-separated-values, 195 data points
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    DATA PANGAEA
  • 3
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    Nd, Sr, and Pb isotope data of IODP Site 353-U1443 measured on the detrital clay fraction (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: We produced orbital-scale resolution geochemical records for International Ocean Discovery Program Site U1443 cored with the RV JOIDES Resolution during IODP Expedition 353 in December 2014 in the southern Bay of Bengal. The Sr, Nd, and Pb isotope compositions of the detrital clay fractions were measured using MC-ICP-MS and span across five key climatic intervals of the middle to late Miocene (15.8 – 9.5 Million years ago). Our new radiogenic isotope time series of clays transported to the Ninetyeast Ridge allow us to distinguish tectonic and climatic forcing of monsoon intensity, weathering regime and erosion intensity of the watersheds feeding into the Bay of Bengal.
    Keywords: 353-U1443; AGE; Bay of Bengal; COMPCORE; Composite Core; detrital clays; Exp353; Joides Resolution; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, standard deviation; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, standard deviation; Lead-207/Lead-206 ratio; Lead-207/Lead-206 ratio, standard deviation; Lead-208/Lead-204 ratio; Lead-208/Lead-204 ratio, standard deviation; Lead-208/Lead-206 ratio; Lead-208/Lead-206 ratio, standard deviation; Lead-208/Lead-207 ratio; Lead-208/Lead-207 ratio, standard deviation; Miocene; Radiogenic isotopes; Sample ID; Site; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation; Weathering; ε-Neodymium; ε-Neodymium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2392 data points
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    DATA PANGAEA
  • 4
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    Stable isotopes and Mg/Ca ratios on foraminifera and Ba/Ca ratios of sediment core SK168/GC-1 (2016)
    PANGAEA
    In:  Supplement to: Gebregiorgis, Daniel; Hathorne, Ed C; Sijinkumar, A V; Nagender Nath, B; Nürnberg, Dirk; Frank, Martin (2016): South Asian summer monsoon variability during the last ~54 kyrs inferred from surface water salinity and river runoff proxies. Quaternary Science Reviews, 138, 6-15, https://doi.org/10.1016/j.quascirev.2016.02.012
    Details
    Publication Date: 2023-02-12
    Description: The past variability of the South Asian Monsoon is mostly known from records of wind strength over the Arabian Sea while high-resolution paleorecords from regions of strong monsoon precipitation are still lacking. Here, we present records of past monsoon variability obtained from sediment core SK 168/GC-1, which was collected at the Alcock Seamount complex in the Andaman Sea. We utilize the ecological habitats of different planktic foraminiferal species to reconstruct freshwater-induced stratification based on paired Mg/Ca and d18O analyses and to estimate seawater d18O (d18Osw). The difference between surface and thermocline temperatures (delta T) and d18Osw (delta d18Osw) is used to investigate changes in upper ocean stratification. Additionally, Ba/Ca in G. sacculifer tests is used as a direct proxy for riverine runoff and sea surface salinity (SSS) changes related to monsoon precipitation on land. Our delta d18Osw time series reveals that upper ocean salinity stratification did not change significantly throughout the last glacial suggesting little influence of NH insolation changes. The strongest increase in temperature gradients between the mixed layer and the thermocline is recorded for the mid-Holocene and indicate the presence of a significantly shallower thermocline. In line with previous work, the d18Osw and Ba/Ca records demonstrate that monsoon climate during the LGM was characterized by a significantly weaker southwest monsoon circulation and strongly reduced runoff. Based on our data the South Asian Summer Monsoon (SAM) over the Irrawaddyy strengthened gradually after the LGM beginning at ~18 ka. This is some 3 kyrs before an increase of the Ba/Ca record from the Arabian Sea and indicates that South Asian Monsoon climate dynamics are more complex than the simple N-S displacement of the ITCZ as generally described for other regions. Minimum d18Osw values recorded during the mid-Holocene are in phase with Ba/Ca marking a stronger monsoon precipitation, which is consistent with model simulations.
    Keywords: Age model; Barium/Calcium ratio; DEPTH, sediment/rock; GC; Globigerinoides sacculifer, Magnesium/Calcium ratio; Globigerinoides sacculifer, δ18O; Gravity corer; Neogloboquadrina dutertrei, Magnesium/Calcium ratio; Neogloboquadrina dutertrei, δ18O; Sagar Kanya; SK168; SK168/GC-1
    Type: Dataset
    Format: text/tab-separated-values, 436 data points
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    DATA PANGAEA
  • 5
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    XRF element analysis of sediment core NGHP Site 17 (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-01
    Keywords: Age model; Andaman Sea; Calcium; CDRILL; Core drilling; DEPTH, sediment/rock; India National Gas Hydrate Program Expedition 01; Iron; Joides Resolution; Manganese; NGHP-01; NGHP-01-17; Potassium; Rubidium; Titanium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 78600 data points
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    DATA PANGAEA
  • 6
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    XRF element analysis of two sediment cores in the Andaman Sea (2020)
    PANGAEA
    In:  Supplement to: Gebregiorgis, Daniel; Giosan, Liviu; Hathorne, Ed C; Anand, Pallavi; Nilsson-Kerr, Katrina; Plaß, Anna; Lückge, Andreas; Clemens, Steven C; Frank, Martin (2020): What Can We Learn From X‐Ray Fluorescence Core Scanning Data? A Paleomonsoon Case Study. Geochemistry, Geophysics, Geosystems, 21(2), https://doi.org/10.1029/2019GC008414
    Details
    Publication Date: 2023-04-01
    Description: X-ray fluorescence (XRF) core scanning of marine and lake sediments has been extensively used to study changes in past environmental and climatic processes over a range of timescales. The interpretation of XRF-derived element ratios in paleoclimatic and paleoceanographic studies primarily considers differences in the relative abundances of particular elements. Here we present new XRF core scanning data from two long sediment cores in the Andaman Sea in the northern Indian Ocean and show that sea level related processes influence terrigenous inputs based proxies such as Ti/Ca, Fe/Ca, and elemental concentrations of the transition metals (e.g. Mn). Zr/Rb ratios are mainly a function of changes in median grain size of lithogenic particles and often covary with changes in Ca concentrations that reflect changes in biogenic calcium carbonate production. This suggests that a common process (i.e. sea level) influences both records. The interpretation of lighter element data (e.g. Si and Al) based on low XRF counts is complicated as variations in mean grain size and water content result in systematic artifacts and signal intensities not related to the Al or Si content of the sediments. This highlights the need for calibration of XRF core scanning data based on discrete sample analyses and careful examination of sediment properties such as porosity/water content for reliably disentangling environmental signals from other physical properties. In the case of the Andaman Sea, reliable extraction of a monsoon signal will require accounting for the sea level influence on the XRF data.
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 7
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    Late Miocene radiogenic Sr, Nd, and Pb isotope data of the detrital clay fraction from IODP Site 353-U1443 (2021)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Description: Data from Enhanced late Miocene chemical weathering and altered precipitation patterns in the watersheds of the Bay of Bengal recorded by detrital clay radiogenic isotopes in Paleoceanography and Paleoclimatology. Marine sediment samples from the late Miocene (approximately 9 to 5 million years ago) were taken from International Ocean Discovery Program (IODP) Site U1443 located on the top of the Ninety East ridge in the southern Bay of Bengal. Samples were taken along the composite sediment section or splice and the age model based on shipboard calcareous nannofossil biostratigraphy and magnetostratigraphy was refined using the stable carbon isotopes of benthic foraminifera. The detrital silicates of the clay size fraction were isolated and measured for their radiogenic Sr, Nd, and Pb isotope composition by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) to investigate the provenance of clays produced by weathering in the surrounding watersheds.
    Keywords: 353-U1443A; 353-U1443B; 353-U1443C; AGE; Bay of Bengal; calculated, 2 sigma; Core; Cruise/expedition; Depth, composite; detrital clays; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp353; Hole; Interval number; Joides Resolution; Late Miocene; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, standard deviation; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, standard deviation; Lead-208/Lead-204 ratio; Lead-208/Lead-204 ratio, standard deviation; MC-ICP-MS; Neodymium-143/Neodymium-144 ratio; Radiogenic isotopes; Sample code/label; Sample comment; Section; Site; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation; Type; Weathering; ε-Neodymium; ε-Neodymium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 968 data points
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    DATA PANGAEA
  • 8
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    Southern Hemisphere forcing of South Asian monsoon precipitation over the past 1 million years (2018)
    PANGAEA
    In:  Supplement to: Gebregiorgis, Daniel; Hathorne, Ed C; Giosan, Liviu; Clemens, Steven C; Nürnberg, Dirk; Frank, Martin (2018): Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years. Nature Communications, 9(1), 4702, https://doi.org/10.1038/s41467-018-07076-2
    Details
    Publication Date: 2023-07-18
    Description: The orbital-scale timing of South Asian monsoon (SAM) precipitation is poorly understood. Here we combine Mg/Ca measurements (a proxy for the temperature prevailing during calcification) and oxygen isotope (δ18O) analyses of the calcite shells of mixed-layer dwelling planktic foraminifera Globigerinoides sacculifer (present all year round in the Bay of Bengal26) in core NGHP 17 (Ref 27) to generate a unique orbital scale SAM precipitation record for the last ~1 million years.
    Keywords: Age model; Age model according to Lisiecki & Raymo (2005) [LR04]; Andaman Sea; CDRILL; Core drilling; DEPTH, sediment/rock; Globigerinoides sacculifer, Magnesium/Calcium ratio; Globigerinoides sacculifer, δ18O; India National Gas Hydrate Program Expedition 01; Joides Resolution; NGHP-01; NGHP-01-17; Reconstructed; Sea surface temperature; δ18O, reconstructed; δ18O, seawater, reconstructed
    Type: Dataset
    Format: text/tab-separated-values, 2096 data points
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    DATA PANGAEA
  • 9
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    XRF element analysis of IODP Site 353-U1448 (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 353-U1448; Age model; Aluminium; Calcium; COMPCORE; Composite Core; Depth, composite; Exp353; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Iron; Joides Resolution; Manganese; Potassium; Silicon; Titanium
    Type: Dataset
    Format: text/tab-separated-values, 50499 data points
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    DATA PANGAEA
  • 10
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    Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years (2018)
    Nature Research
    In:  Nature Communications, 9 (4702).
    Details
    Publication Date: 2021-03-19
    Description: The orbital-scale timing of South Asian monsoon (SAM) precipitation is poorly understood. Here we present new SST and seawater δ18O (δ18Osw) records from the Bay of Bengal, the core convective region of the South Asian monsoon, over the past 1 million years. Our records reveal that SAM precipitation peaked in the precession band ~9 kyrs after Northern Hemisphere summer insolation maxima, in phase with records of SAM winds in the Arabian Sea and eastern Indian Ocean. Precession-band variance, however, accounts for ~30% of the total variance of SAM precipitation while it was either absent or dominant in records of the East Asian monsoon (EAM). This and the observation that SAM precipitation was phase locked with obliquity minima and was sensitive to Southern Hemisphere warming provides clear evidence that SAM and EAM precipitation responded differently to orbital forcing and highlights the importance of internal processes forcing monsoon variability.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/s41467-018-07076-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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