Can shells of freshwater mussels (Unionidae) be used to estimate low summer discharge of rivers and associated droughts?
Can shells of freshwater mussels (Unionidae) be used to estimate low summer discharge of rivers and associated droughts?
复制标题
淡水贻贝（贻贝科）的壳可用于估计夏季河流流量低和相关的干旱吗？
DOI：
10.1007/s00531-010-0551-0
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发表时间：
2011
影响因子：
2.3
通讯作者：
D. Kroon
中科院分区：
文献类型：
--
作者：
E. Versteegh;H. Vonhof;S. Troelstra;D. Kroon
本文研究了Uniosp的壳氧同位素比值（δ 18 Oar）。可以作为默兹河过去流量的代表。该代用指标是根据1997-2007年参考时间间隔的现代数据集开发的，该数据集显示了排放量与测量的水氧同位素比值（δ 18 Ow）之间的对数关系。为了测试过去时间间隔的这种关系，测量了生长增量为4Uniosp的文石中的δ 18 Oar值。贝壳;两个来自相对潮湿的时期，两个来自非常干燥的时间间隔（分别为1910-1918年和1969-1977年）。利用现有的水温记录，将壳体δ 18 OAr记录转换为δ 18 OW值。根据1910-1918年的δ 18 Oar重建的夏季δ 18 Ow值显示出与参考时间间隔1997-2007年的夏季δ 18 Ow值相似的范围，而1969-1977年的夏季重建δ 18 Ow值则非常高。这些高δ 18 Ows值表明，默兹河在后一个时间段经历了严重的夏季干旱。然后应用δ 18 Owvalues计算流量值。利用δ 18 Ows与流量的对数关系，尝试从重建的δ 18 Ows值估算流量。计算的夏季流量结果与实测流量数据的比较表明，在重建的δ 18 Owrecords中可以检测到低于6 m3/s阈值的默兹河低流量事件，但真正的量化仍然存在问题。
This paper examines if shell oxygen isotope ratios (δ18Oar) ofUniosp. can be used as a proxy of past discharge of the river Meuse. The proxy was developed from a modern dataset for the reference time interval 1997–2007, which showed a logarithmic relationship between discharge and measured water oxygen isotope ratios (δ18Ow). To test this relationship for past time intervals, δ18Oarvalues were measured in the aragonite of the growth increments of fourUniosp. shells; two from a relatively wet period and two from a very dry time interval (1910–1918 and 1969–1977, respectively). Shell δ18Oarrecords were converted into δ18Owvalues using existing water temperature records. Summer δ18Owvalues, reconstructed from δ18Oarof 1910–1918, showed a similar range as the summer δ18Owvalues for the reference time interval 1997–2007, whilst summer reconstructed δ18Owvalues for the time interval 1969–1977 were anomalously high. These high δ18Owvalues suggest that the river Meuse experienced severe summer droughts during the latter time interval. δ18Owvalues were then applied to calculate discharge values. It was attempted to estimate discharge from the reconstructed δ18Owvalues using the logarithmic relationship between δ18Owand discharge. A comparison of the calculated summer discharge results with observed discharge data showed that Meuse low-discharge events below a threshold value of 6 m3/s can be detected in the reconstructed δ18Owrecords, but true quantification remains problematic.