/* DATA DESCRIPTION:
Citation:	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): Geochemical parameters determined in sediment cores from Lake Burgäschi, Switzerland [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.908896
Abstract:	Sediment phosphorus (P) released to surface water (a.k.a. internal P loading) is the key factor delaying lake recovery from eutrophication in many lakes. The sediment P availability and release risk into lake water can be largely evaluated by P fractions in sediments. In deep eutrophic lakes, hypolimnetic anoxia is suggested to prompt sediment-P mobility and potentially increase internal P loading on short term. However, the long-term effects hypolimnetic redox conditions and trophic state on sedimentary P-fraction retention in deep lakes are not clear.
	In this study we investigated two sediment cores retrieved from the deepest part of Lake Burgäschi, Switzerland. The age-depth profile based on 210Pb and 137Cs chronology dates back to the early 1900s. Sedimentary green-pigments (chlorophylls and diagenetic products) inferred from hyperspectral imaging (HSI) scanning and X-ray fluorescence (XRF)-inferred Fe/Mn ratios primarily reflect lake trophic state evolution (aquatic primary productivity) and hypolimnetic oxygenation, respectively. A sequential P-extraction with five P fractions was performed to uncover P fractionation in sediment profiles. In addition, we measured the sediment bulk elements of carbon, nitrogen and sulfur. The temporal records of P fractions concentrations and net burial rates (NBR) in sediments were investigated.
Keyword(s):	deep lakes; eutrophication; hypolimnetic anoxia; hypolimnetic withdrawal; Phosphorus fractions
Supplement to:	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2020): The influences of historic lake trophy and mixing regime changes on long-term phosphorus fraction retention in sediments of deep eutrophic lakes: a case study from Lake Burgäschi, Switzerland. Biogeosciences, 17, 2715–2729, https://doi.org/10.5194/bg-17-2715-2020
Coverage:	LATITUDE: 47.169060 * LONGITUDE: 7.668140
Event(s):	Burg17-B * LATITUDE: 47.169060 * LONGITUDE: 7.668140 * Lake water depth: 31 m * Recovery: 0.75 m * LOCATION: Lake Burgäschi, Switzerland * METHOD/DEVICE: Gravity corer, UWITEC (GCUWI) * COMMENT: Deepest point of the lake, September 2017
License:	Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC-BY-NC-SA-4.0) (URI: https://creativecommons.org/licenses/by-nc-sa/4.0/)
Size:	7 datasets
*/
/* TABULAR SUMMARY OF DATASETS LISTED IN THIS COLLECTION: */
Filename	Citation of child dataset
Burg17-B_age_depth_CRS.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): 210Pb chronology of sediment core Burg17-B. https://doi.org/10.1594/PANGAEA.908893
Burg17-B_RABD.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): RABD index of core Burg17-B. https://doi.org/10.1594/PANGAEA.908894
Burg17-B_radionuclides.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): Radionuclides of core Burg17-B. https://doi.org/10.1594/PANGAEA.908898
Burg17-B_XRF.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): XRF element data of core Burg17-B. https://doi.org/10.1594/PANGAEA.908895
Burg17-C_Burg17-B_allignment.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): Correlation of sediment cores Burg17-C and Burg17-B. https://doi.org/10.1594/PANGAEA.909046
Burg17-C_P-flux.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): Phosphorus flux of sediment core Burg17-C. https://doi.org/10.1594/PANGAEA.909851
Burg17-C_P-fractions.tab	Tu, Luyao; Zander, Paul D; Szidat, Sönke; Lloren, Ronald; Grosjean, Martin (2019): Phosphorus fractions of core Burg17-C. https://doi.org/10.1594/PANGAEA.909044
