Are we missing the tail (and the tale) of residence time distributions in watersheds?
Are we missing the tail (and the tale) of residence time distributions in watersheds?
复制标题
我们是否错过了流域中停留时间分布的尾部（和故事）？
DOI：
10.1002/grl.50895
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
Andrew R. Campbell
中科院分区：
文献类型：
--
作者：
M. Frisbee;John L. Wilson;J. Gomez‐Velez;F. Phillips;Andrew R. Campbell
停留时间为流域水文、地球化学和生态过程提供了重要信息。普遍的看法是，在流域的平均停留时间很短，大约几天到几年。然而，人们越来越担心，传统的地表水年龄测定方法无法捕获数百年至数千年的更长停留时间。我们假设，如果平均停留时间偏短，那么从平均停留时间计算的风化率将被迫不切实际地高，以匹配观察到的溶质浓度。我们通过使用三种不同的年龄测定方法估计的停留时间计算泉水的风化速率来测试这一假设。观察到的溶质浓度需要不切实际的大风化率，如果采用典型的短停留时间相比，从较长的停留时间。流域中的停留时间分布比以前认为的要长得多，这对年龄测定方法及其解释推断过程行为有影响。
Residence times provide vital information on hydrological, geochemical, and ecological processes in watersheds. The common perception is that mean residence times in watersheds are very short, on the order of days to years. However, there is growing concern that longer residence times of centuries to millennia are not being captured by traditional surface water age‐dating methods. We hypothesize that if mean residence times are biased short, then weathering rates calculated from mean residence times will be forced unrealistically high to match observed solute concentrations. We test this hypothesis by calculating weathering rates from springs based upon residence times estimated using three different age‐dating methods. Observed solute concentrations require unrealistically large weathering rates if typical short residence times are employed as compared to rates derived from longer residence times. Residence time distributions in watersheds have substantially longer tails than previously thought, with implications for age‐dating methods and their interpretation to infer process behavior.