Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gecoa..69.2253b&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 69, Issue 9, p. 2253-2263.
Other
1
Scientific paper
Neodymium (Nd) isotope profiles were analyzed on two Baltic Mn/Fe precipitates (99/2 and TL1) from shallow water (20 m) of the Mecklenburg Bay. The age range of these Mn/Fe precipitates determined by 226Raex/Ba dating reaches from recent growth back to ˜4300 and 1000 yr BP, respectively. Over this time range, the Nd isotope composition varies from ɛNd (0) = -13.1 to -17.5 in the selected Baltic precipitates indicating substantial changes in the Nd isotope composition of the Baltic Sea. The lowest ɛNd values were recorded during the time interval of the Little Ice Age (LIA, AD ˜1350 to 1850). These minimum values indicate either an increase of the input of less radiogenic Nd from Scandinavian Archean-Proterozoic sources (ɛNd about -22) to the Baltic Sea or a decrease of the input of more radiogenic Nd from continental European sources (ɛNd about -12) and/or North Sea water (ɛNd about -10). Variations of both, erosive continental input and North Sea inflow may indicate a direct response of the Nd isotope signal in the Baltic Sea to climate changes during the LIA and be related to cyclic shifts in the atmospheric circulation triggered by the North Atlantic Oscillation (NAO). Another aspect that possibly influenced the input of trace elements and Nd isotopes into the Baltic Sea is the population development in the circum Baltic area during the LIA. The lowest ɛNd values also correspond to the medieval demographic crises that led to a significant decrease of agricultural activity and farmland. The reduction of soil erosion and enhanced regrowth of natural vegetation may have changed the amount and proportions of dissolved and suspended particulate matter transported into the Baltic Sea by rivers which in turn may have resulted in a change of the Nd isotope composition of Baltic Sea water.
Bock Barbara
Eisenhauer Anton
Frei Robert
Leipe Thomas
Liebetrau Volker
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