Temporal changes of accretion rates on an estuarine salt marsh during the late Holocene: reflections of local sea level changes? The Wadden Sea, Denmark
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Temporal changes of accretion rates on an estuarine salt marsh during the late Holocene : reflections of local sea level changes? The Wadden Sea, Denmark. / Madsen, Anni Tindahl; Murray, A. S.; Andersen, Thorbjørn Joest; Pejrup, Morten.
In: Marine Geology, Vol. 242, No. 4, 2007, p. 221-233.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Temporal changes of accretion rates on an estuarine salt marsh during the late Holocene
T2 - reflections of local sea level changes? The Wadden Sea, Denmark
AU - Madsen, Anni Tindahl
AU - Murray, A. S.
AU - Andersen, Thorbjørn Joest
AU - Pejrup, Morten
PY - 2007
Y1 - 2007
N2 - The temporal variability of estuarine sedimentation has been investigated in the northernmost part of theWadden Sea (Denmark), using an estuarine sedimentary sequence at Ho Havn. The sedimentary sequence appears to have been deposited within the last ~2000 yr based on detailed luminescence dating of the estuarine mud, whose ages range between 225±40 and 2050±300 yr. The age-depth profile reveals that the sedimentation rate has varied considerably in the past. Estuarine sedimentation was very rapid ~1400 yr ago; the ages over almost 1 m of sediment are indistinguishable. After this accretion rate of ~9 mm a-1, the rate dropped abruptly to ~0.3 mm a-1 some time between 1340 and 970 yr ago. This slow rate of accretion continued until ~350 yr ago, when it accelerated to ~1.3 mm a-1. These abrupt changes in the accretion rate are possibly related to local sea level fluctuations, thus the period with low accretion rate most probably reflects a situation with a stable or decreasing relative sea level. The rapid deposition of ~0.9 m of sediment within about one century some 1400 yr ago shows that large amounts of fine-grained sediment were available for deposition in the region at that time, and an increasing relative sea level was most probably responsible for the creation of the accommodation space for sedimentation. Recent studies on mudflats and salt marshes in the region also tend to show high accretion rates, indicating that the coastal lagoons could be less vulnerable and threatened by a future sea level rise than generally believed.
AB - The temporal variability of estuarine sedimentation has been investigated in the northernmost part of theWadden Sea (Denmark), using an estuarine sedimentary sequence at Ho Havn. The sedimentary sequence appears to have been deposited within the last ~2000 yr based on detailed luminescence dating of the estuarine mud, whose ages range between 225±40 and 2050±300 yr. The age-depth profile reveals that the sedimentation rate has varied considerably in the past. Estuarine sedimentation was very rapid ~1400 yr ago; the ages over almost 1 m of sediment are indistinguishable. After this accretion rate of ~9 mm a-1, the rate dropped abruptly to ~0.3 mm a-1 some time between 1340 and 970 yr ago. This slow rate of accretion continued until ~350 yr ago, when it accelerated to ~1.3 mm a-1. These abrupt changes in the accretion rate are possibly related to local sea level fluctuations, thus the period with low accretion rate most probably reflects a situation with a stable or decreasing relative sea level. The rapid deposition of ~0.9 m of sediment within about one century some 1400 yr ago shows that large amounts of fine-grained sediment were available for deposition in the region at that time, and an increasing relative sea level was most probably responsible for the creation of the accommodation space for sedimentation. Recent studies on mudflats and salt marshes in the region also tend to show high accretion rates, indicating that the coastal lagoons could be less vulnerable and threatened by a future sea level rise than generally believed.
KW - Faculty of Science
KW - OSL datering
KW - Danmark
KW - vade hav
KW - kvarts
KW - 137Cs datering
KW - 210Pb datering
KW - 14C datering
KW - OSL dating
KW - Denmark
KW - wadden sea
KW - Ho Havn
KW - sea level fluctuations
KW - estuarine sedimentation
KW - Quartz
KW - 137Cs dating
KW - 210Pb dating
KW - 14C dating
U2 - doi:10.1016/j.margeo.2007.03.001
DO - doi:10.1016/j.margeo.2007.03.001
M3 - Journal article
VL - 242
SP - 221
EP - 233
JO - Marine Geology
JF - Marine Geology
SN - 0025-3227
IS - 4
ER -
ID: 3570086