Dearing Crampton-Flood, Emily; Tierney, Jessica E; Peterse, Francien; Kirkels, Frédérique M S A; Sinninghe Damsté, Jaap S (2019): Global soil and peat branched GDGT compilation dataset [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.907818, Supplement to: Dearing Crampton-Flood, E et al. (2020): BayMBT: A Bayesian calibration model for branched glycerol dialkyl glycerol tetraethers in soils and peats. Geochimica et Cosmochimica Acta, 268, 142-159, https://doi.org/10.1016/j.gca.2019.09.043
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Abstract:
Accurate temperature records for the deep geological past are a vital component of paleoclimate research. Distributional changes of branched glycerol dialkyl glycerol tetraether (brGDGT) lipids in geological archives including paleosoils are a promising indicators to infer past continental air temperatures. However, the 'orphan' status of the brGDGTs, the potential effect of temperature-independent parameters on their relative distribution, and the uneven geographical distribution of the soils used for calibration contribute to the high uncertainty of brGDGT-based transfer functions (root mean squared error, RMSE: ± 5 °C). Here, we expand the soil dataset from the previous calibration(s) with new and published soil data. We use Bayesian statistics to calibrate the relationship of the 5-methyl brGDGTs (MBT'5Me) and mean annual air temperature (MAAT). The addition of soils from warm (>28 °C) environments from India substantially increases the upper limit of the Bayesian calibration (BayMBT) from 25 to 29 °C, aiding in the generation of temperature records for past greenhouse climates, such as the Eocene. The BayMBT model also effectively minimizes the structured MAAT residuals prevalent in previous calibrations, therefore giving the opportunity to explore confounding factors on the calibration. We formulate a set of alternative calibration models to test the effect of specific environmental parameters and show that soils at mid-latitudes with temperature seasonalities >20 °C are not well described by the BayMBT model. We find that the MBT'5Me index is best correlated to the average temperature of all months >0 °C, called the BayMBT0 model. This finding supports the hypothesis that brGDGT production ceases or slows down in the winter months. However, a persistent feature of the BayMBT model and previous calibrations is the significant scatter at mid-latitudes, which is speculatively linked with a possible increase in diversity of microbial brGDGT-producing communities in these locations.
Related to:
De Jonge, Cindy; Hopmans, Ellen C; Zell, Claudia; Kim, Jung-Hyun; Schouten, Stefan; Sinninghe Damsté, Jaap S (2014): Occurrence and abundance of 6-methyl branched glycerol dialkyl glycerol tetraethers in soils: Implications for palaeoclimate reconstruction. Geochimica et Cosmochimica Acta, 141, 97-112, https://doi.org/10.1016/j.gca.2014.06.013
Ding, Su; Xu, Yunping; Wang, Yujie; He, Y; Hou, Juzhi; Chen, L; He, Jin-Sheng (2015): Distribution of branched glycerol dialkyl glycerol tetraethers in surface soils of the Qinghai–Tibetan Plateau: implications of brGDGTs-based proxies in cold and dry regions. Biogeosciences, 12(11), 3141-3151, https://doi.org/10.5194/bg-12-3141-2015
Harris, Ian; Jones, Philip D; Osborn, Timothy J; Lister, David (2014): Updated high-resolution grids of monthly climatic observations - the CRU TS3.10 Dataset. International Journal of Climatology, 34(3), 623-642, https://doi.org/10.1002/joc.3711
Lei, Yanyan; Yang, Huan; Dang, Xinyue; Zhao, Shijing; Xie, Shucheng (2016): Absence of a significant bias towards summer temperature in branched tetraether-based paleothermometer at two soil sites with contrasting temperature seasonality. Organic Geochemistry, 94, 83-94, https://doi.org/10.1016/j.orggeochem.2016.02.003
Naafs, Bernhard David A (2017): Global biomarker (GDGT) database for peatlands. PANGAEA, https://doi.org/10.1594/PANGAEA.883765
Naafs, Bernhard David A; Inglis, Gordon N; Zheng, Y; Amesbury, Matthew J; Biester, Harald; Bindler, Richard; Blewett, Jerome; Burrows, M A; del Castillo Torres, D; Chambers, Frank M; Cohen, A D; Evershed, Richard P; Feakins, Sarah J; Gałka, Mariusz; Gallego-Sala, Angela V; Gandois, Laure; Gray, D M; Hatcher, P G; Honorio Coronado, Euridice N; Hughes, P D M; Huguet, Arnaud; Könönen, M; Laggoun-Défarge, Fatima; Lähteenoja, Outi; Lamentowicz, Mariusz; Marchant, Robert; McClymont, Erin L; Pontevedra-Pombal, Xabier; Ponton, Camilo; Pourmand, Ali; Rizzuti, A M; Rochefort, Line; Schellekens, J; De Vleeschouwer, Francois; Pancost, Richard D (2017): Introducing global peat-specific temperature and pH calibrations based on brGDGT bacterial lipids. Geochimica et Cosmochimica Acta, 208, 285-301, https://doi.org/10.1016/j.gca.2017.01.038
Wang, Huanye; Liu, Weiguo; Lu, S-H (2016): Appraisal of branched glycerol dialkyl glycerol tetraether-based indices for North China. Organic Geochemistry, 98, 118-130, https://doi.org/10.1016/j.orggeochem.2016.05.013
Xiao, Wenjie; Xu, Yunping; Ding, Su; Wang, Yinghui; Zhang, Xinyu; Yang, Huan; Wang, Guoan; Hou, Juzhi (2015): Global calibration of a novel, branched GDGT-based soil pH proxy. Organic Geochemistry, 89-90, 56-60, https://doi.org/10.1016/j.orggeochem.2015.10.005
Yang, Huan; Lü, Xiaoxia; Ding, Weihua; Lei, Yanyan; Dang, Xinyue; Xie, Shucheng (2015): The 6-methyl branched tetraethers significantly affect the performance of the methylation index (MBT′) in soils from an altitudinal transect at Mount Shennongjia. Organic Geochemistry, 82, 42-53, https://doi.org/10.1016/j.orggeochem.2015.02.003
Coverage:
Median Latitude: 34.268748 * Median Longitude: 47.134585 * South-bound Latitude: -54.900000 * West-bound Longitude: -159.820000 * North-bound Latitude: 79.200000 * East-bound Longitude: 172.150000
Parameter(s):
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Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
13260 data points
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