Accumulation rates of estuarine sediment in the dollard area: comparison of 210Pb and pollen influx methods |
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| Institution: | 1. Institute for Earth Sciences, Department of Quaternary Geology, Free University, Amsterdam, The Netherlands;2. Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands;1. Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan, Ningxia, 750021, China;2. School of Life Sciences, Ningxia University, Yinchuan, Ningxia, 750021, China;3. Key Laboratory of Hui Ethnic Medicine Modernization Ministry of Education, Ningxia Medical University, Yinchuan, 750004, China;1. Dana-Farber Cancer Institute, Boston, MA, USA;2. University of Chicago, Chicago, IL, USA;3. Perlmutter Cancer Center at NYU Langone Health, New York, NY, USA;4. Yale Cancer Center, New Haven, CT, USA;5. Memorial Sloan Kettering Cancer Center and Weill Cornell Medical College, New York, NY, USA;6. Fred Hutchinson Cancer Research Center and University of Washington, Seattle, WA, USA;7. University of Southern California Norris Comprehensive Cancer Center, Los Angeles, CA, USA;8. Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI, USA;9. Seagen Inc., Bothell, WA, USA;10. Astellas Pharma US, Inc., Northbrook, IL, USA;11. Modus Outcomes, Lyon, France;12. Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA |
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| Abstract: | Profiles of excess 210Pb activity in sediment cores collected on the muddy tidal flats of the Dollard indicate deposition rates ranging from 0.14 to 0.27 cm·y−1. One profile was also analysed for pollen: the pollen profile in the core provided a record of the sedimentation rate because two independent historical events were found recorded in the profile. The first, a sudden abundance of an Aster-type pollen, reflected, at a depth of 33 cm in the sediment, the large land reclamation of 1862 A.D. The second, the appearance of Zea mays (corn) at a depth of 6 cm, reflected the increase of the area in which corn was cultivated: from 44 ha in 1970 up to 552 ha in 1973. The pollen data gave an estimated sedimentation rate of 0.25 cm·y−1. Excess 210Pb analysis of the same core yielded a sedimentation rate of 0.27 cm·y−1. |
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