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  • 1
    Publication Date: 2023-03-14
    Keywords: Banagi; Conductivity; DEPTH, soil; Elevation of event; Event label; GDGTs; Kemarishe; Kirawira; Latitude of event; Longitude of event; Makoma; Malambo Road; MULT; Multiple investigations; Musabi; Naabi Hill; Ndabakal; Nyaruswiga; Optional event label; pH; Salinity; Sample code/label; Serengeti; Serengeti_soil_Banagi; Serengeti_soil_Kemarishe; Serengeti_soil_Kirawira; Serengeti_soil_Makoma; Serengeti_soil_Malambo_Road; Serengeti_soil_Musabi; Serengeti_soil_Naabi_Hill; Serengeti_soil_Ndabaka; Serengeti_soil_Nyaruswiga; Serengeti_soil_Shifting_Sands; Serengeti_soil_Simba_Kopjes; Shifting Sands; Simba Kopjes; Soil; Total dissolved solids
    Type: Dataset
    Format: text/tab-separated-values, 492 data points
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2023-03-14
    Description: In this work we used controlled microcosms to study the effect of temperature and pH on brGDGTs in lake water. We collected surface water from Kennedy Lake, Tucson, AZ, a shallow eutrophic artificial reservoir previously described by Martínez-Sosa & Tierney (2019). From the collected samples we set up a series of microcosms, consisting of 1L glass flasks filled with lake water, and manipulated single environmental factors including temperature and pH. For our temperature incubations, we selected four conditions (9C, 18C, 27C and 35C) and incubated 3 1L flasks under each condition for two periods of time (4 or 6 weeks). For the pH incubations, we used commercially available freshwater aquarium non-phosphate buffers (Proprietary composition, Seachem, Madison, GA, USA) to manipulate the pH of the microcosms. For these experiments we targeted four pH conditions (4, 5, 6 and 7), and included two control samples: one where we added enough buffer to maintain the initial pH (Control + Buffer), and another to which we added no buffer (Control - Buffer). GDGTs were analyzed on an Agilent 1260 Infinity HPLC coupled to an Agilent 6120 single quadrupole mass spectrometer using two BEH HILIC silica columns (2.1 x 150 mm, 1.7 um; Waters) and the methodology of Hopmans et al. (2016). We calculated peak areas using the MATLAB package software ORIGAmI (Fleming et al. 2016) and estimated the concentration of brGDGTs by comparing the obtained peaks with a C46 internal standard (Huguet et al. 2006) normalized to the volume of each sample.
    Keywords: Branched glycerol dialkyl glycerol tetraether; Branched glycerol dialkyl glycerol tetraether, Ia; Branched glycerol dialkyl glycerol tetraether, Ib; Branched glycerol dialkyl glycerol tetraether, Ic; Branched glycerol dialkyl glycerol tetraether, IIa; Branched glycerol dialkyl glycerol tetraether, IIa'; Branched glycerol dialkyl glycerol tetraether, IIb; Branched glycerol dialkyl glycerol tetraether, IIb'; Branched glycerol dialkyl glycerol tetraether, IIIa; Branched glycerol dialkyl glycerol tetraether, IIIa'; brGDGTs; Calculated; Cyclization ratio of branched tetraethers; Degree of cyclisation; Experiment; Incubation duration; Isomer ratio; Kennedy_Lake_water_microcosm; Laboratory experiment; lakes; Methylation index of 5-methyl branched glycerol dialkyl glycerol tetraether; microcosms; pH; Sample ID; Standard deviation; Temperature; Temperature, water; Tucson, Arizona, USA
    Type: Dataset
    Format: text/tab-separated-values, 528 data points
    Location Call Number Limitation Availability
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  • 3
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    PANGAEA
    In:  Supplement to: Tierney, Jessica E; Oppo, Delia W; Rosenthal, Yair; Russell III, James M; Linsley, Braddock K (2010): Coordinated hydrological regimes in the Indo-Pacific region during the past two millennia. Paleoceanography, 25(1), PA1102, https://doi.org/10.1029/2009PA001871
    Publication Date: 2023-05-12
    Description: Instrumental data suggest that major shifts in tropical Pacific atmospheric dynamics and hydrology have occurred within the past century, potentially in response to anthropogenic warming. To better understand these trends, we use the hydrogen isotopic ratios of terrestrial higher plant leaf waxes (DDwax) in marine sediments from southwest Sulawesi, Indonesia, to compile a detailed reconstruction of central Indo-Pacific Warm Pool (IPWP) hydrologic variability spanning most of the last two millennia. Our paleodata are highly correlated with a monsoon reconstruction from Southeast Asia, indicating that intervals of strong East Asian summer monsoon (EASM) activity are associated with a weaker Indonesian monsoon (IM). Furthermore, the centennial-scale oscillations in our data follow known changes in Northern Hemisphere climate (e.g., the Little Ice Age and Medieval Warm Period) implying a dynamic link between Northern Hemisphere temperatures and IPWP hydrology. The inverse relationship between the EASM and IM suggests that migrations of the Intertropical Convergence Zone and associated changes in monsoon strength caused synoptic hydrologic shifts in the IPWP throughout most of the past two millennia.
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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  • 4
    Publication Date: 2023-01-30
    Description: Soil profiles were collected along a transect across the Serengeti ecosystem, in Tanzania from 2-3S and 34-35.5E, 1153 to 1677 m above sea level and 0 to 1.6 m soil depth. The samples are modern soils and the temporal span of the soil depth profiles is unconstrained, likely centuries to millennia. The survey is intended to observe soil microbial lipid biomarkers that are commonly used as proxies for temperature and pH and to assess their robustness in alkaline carbonate-precipitating soil profiles, where soil carbonate proxies can also be applied. These modern calibrations can inform reconstructions of Eastern African paleoenvironments using the same proxies in geological archives. Lipid extractions and purifications were performed at USC in 2018-2019 and abundances of branched and isoprenoidal glycerol dialkyl glycerol tetraethers were obtained by high pressure liquid chromatography mass spectrometry, performed in 2020-2021 at the University of Arizona. Contextual data include total dissolved solids and pH measurements at the University of Houston in 2020-2021. For more information, please consult associated manuscript on the GDGTs within these soil profiles: Peaple et al., (2022) Identifying the drivers of GDGT distributions in alkaline soil profiles within the Serengeti ecosystem, Organic Geochemistry, in review. A publication on the bulk organics and compound specific carbon isotopic composition of plant waxes in the same soils: Zhang, et al. (2021) Carbon isotopic composition of plant waxes, bulk organics and carbonates from soils of the Serengeti grasslands, Geochimica et Cosmochimica Acta, 311, 316-331, doi:10.1016/j.gca.2021.07.005. That study includes stable hydrogen isotopic data on plant wax, available from doi:10.1594/PANGAEA.921002. A publication on multiple oxygen isotopes within carbonates in the same soil profiles can be found at: Beverly, E.J., Levin, N.E., Passey, B.H., Aron, P.G., Yarian, D.A., Page, M. and Pelletier, E.M. (2021) Triple oxygen and clumped isotopes in modern soil carbonate along an aridity gradient in the Serengeti, Tanzania. Earth and Planetary Science Letters, 567, 116952, doi:10.1016/j.epsl.2021.116952. That study includes stable carbon isotopic data on soil carbonates, available from doi:10.5281/zenodo.4919027.
    Keywords: GDGTs; pH; Salinity; Soil
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 5
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    PANGAEA
    In:  Supplement to: Tierney, Jessica E; Malevich, Steven Brewster; Gray, William; Vetter, Leal; Thirumalai, Kaustubh (2019): Bayesian calibration of the Mg/Ca paleothermometer in planktic foraminifera. EarthArXiv, https://doi.org/10.31223/osf.io/y3xdg
    Publication Date: 2023-01-30
    Description: This dataset contains a modern core top collection of Mg/Ca in planktic foraminifera; the same dataset averaged to 1 x 1 grids; a collection of Mg/Ca in culture experiments with planktic foraminifera; a collection of Mg/Ca and Mg/Ca of seawater in culture experiments with planktic and benthic foraminifera; and a collection of geological estimates of the Mg/Ca of seawater.
    Keywords: File content; File format; File name; File size; Mg/Ca; Mg/Ca seawater; planktic foraminifera; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
    Location Call Number Limitation Availability
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  • 6
    Publication Date: 2023-01-30
    Description: A collection of geochemical SST proxy from the Last Glacial Maximum (23-19 ka) and the Late Holocene (4-0 ka) and results from data assimilation with iCESM 1.2. Includes raw proxy data from the LGM (Tierney2020_LGMProxyData.csv) and LH (Tierney2020_LHProxyData.csv) time slices, with calibrated absolute SSTs; "paired" (data in the same location) proxies with calibrated SST anomalies (Tierney2020_ProxyDataPaired.csv); a 5˚ x 5˚ gridded product of the paired proxies in netCDF format (Tierney2020_ProxyData_5x5_deltaSST.nc); and the results from the DA in netCDF format. The DA results are split into atmospheric variables (SAT, d18O of precipitation; Tierney2020_DA_atm.nc) and oceanic variables (SST, SSS, and d18O of seawater; Tierney2020_DA_ocn.nc). The ocean data are provided on their native tripolar grid (Tierney2020_DA_ocn.nc) as well as a 1 x 1 regridded version (Tierney2020_DA_ocn_regrid.nc).
    Keywords: Binary Object; Binary Object (File Size); Binary Object (Media Type); d18O; Data Assimilation; File content; Last Glacial Maximum; Mg/Ca; SST; TEX86; UK37
    Type: Dataset
    Format: text/tab-separated-values, 14 data points
    Location Call Number Limitation Availability
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  • 7
    Publication Date: 2023-04-01
    Description: Despite widespread use of branched glycerol dialkyl glycerol tetraethers (brGDGTs) for paleo-temperature reconstruction, no global calibration for their application in lakes has been generated since improved analytical methods have allowed for the separation of the structural isomers [Hopmans et al., 2016]. This is a substantial obstacle for the application of this tool as soil calibrations underestimate temperature values when applied to lake sediments. In order to generate a global calibration, we present a comprehensive dataset (N = 272) of lacustrine brGDGT distributions, consisting of both new and previously reported samples [Boldt et al., 2015; Dang et al., 2018; 2016; Li et al., 2017; Stefanescu et al., 2021], spanning a wide range of geographical locations. In addition, we compiled environmental information from these locations through in situ measurements [Li et al., 2017] and literature search for pH, conductivity, and nutrient content. For parameters such as mean annual air temperature (MAAT), temperature of months above freezing (MAF), mean annual precipitation (MAP), we estimated values from either the CRU [Osborn and Jones, 2014] or PRISM [https://prism.oregonstate.edu/] products depending on the location. Our new calibration [Martínez-Sosa et al., 2021] facilitates the use of lacustrine brGDGTs to reconstruct continental temperatures, a vital piece of information for understanding past climates.
    Keywords: calibration; lakes
    Type: Dataset
    Format: application/zip, 36.8 kBytes
    Location Call Number Limitation Availability
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  • 8
    Publication Date: 2023-05-12
    Keywords: Age; Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard deviation; Age, error; BJ8-03-31MC; BJ8-03-34GGC; DEPTH, sediment/rock; Event label; GC; Gravity corer; Laboratory code/label; MUC; MultiCorer; West Sulawesi margin
    Type: Dataset
    Format: text/tab-separated-values, 37 data points
    Location Call Number Limitation Availability
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  • 9
    Publication Date: 2023-05-12
    Keywords: BJ8-03-31MC; DEPTH, sediment/rock; Lead-210; MUC; MultiCorer; West Sulawesi margin
    Type: Dataset
    Format: text/tab-separated-values, 13 data points
    Location Call Number Limitation Availability
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  • 10
    Publication Date: 2023-05-12
    Keywords: Age; AGE; BJ8-03-31MC; DEPTH, sediment/rock; Fatty acids, δ13C; Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS); MUC; MultiCorer; West Sulawesi margin
    Type: Dataset
    Format: text/tab-separated-values, 23 data points
    Location Call Number Limitation Availability
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