THE DOLE EFFECT AND ITS VARIATIONS DURING THE LAST 130,000 YEARS AS MEASURED IN THE VOSTOK ICE CORE
THE DOLE EFFECT AND ITS VARIATIONS DURING THE LAST 130,000 YEARS AS MEASURED IN THE VOSTOK ICE CORE
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DOI：
10.1029/94gb00724
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发表时间：
1994-09-01
影响因子：
5.2
通讯作者：
LABEYRIE, L
中科院分区：
文献类型：
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作者：
BENDER, M;SOWERS, T;LABEYRIE, L
我们回顾了目前对多尔效应(观测到的大气O-2与海水的差异)及其原因的认识，利用从研究Vostok冰芯(Sowers等人，1993)获得的O-2的增量(18)O的数据，将多尔效应的变化记录扩展到目前的130KYR，并讨论了时间变化的意义。多尔效应反映了光合作用、呼吸作用和水文过程(蒸发、降水和蒸散)中氧同位素的分馏作用。我们对当前多尔效应的最好预测是千分之+20.8，比观测值+千分之23.5低得多，我们讨论了造成这种差异的可能原因。在过去的130KYR期间，多尔效应比现在的值平均低了0.05ppm。杜尔效应与平均值的标准偏差仅为千分之+/-0.2，在冰盛期和间冰期之间杜尔效应几乎没有变化。多尔效应的微小变异性表明，陆地和海洋领域的初级生产量的相对比率一直相对恒定。多尔效应中的大多数周期变化都在岁差范围内，这表明这一全球生物地球化学项的变化反映了低纬陆地水文和生产力的变化，或者可能反映了低纬海洋生产力的变化。
We review the current understanding of the Dole effect (the observed difference between the delta(18)O of atmospheric O-2 and that of seawater) and its causes, extend the record of variations in the Dole effect back to 130 kyr before present using data on the delta(18)O of O-2 Obtained from studying the Vostok ice core (Sowers et al., 1993), and discuss the significance of temporal variations. The Dole effect reflects oxygen isotope fractionation during photosynthesis, respiration, and hydrologic processes (evaporation, precipitation, and evapotranspiration). Our best prediction of the present-day Dole effect, + 20.8 parts per thousand, is considerably lower than the observed value, + 23.5 parts per thousand, and we discuss possible causes of this discrepancy. During the past 130 kyr, the Dole effect has been 0.05 parts per thousand lower than the present value, on average. The standard deviation of the Dole effect from the mean has been only +/- 0.2 parts per thousand, and the Dole effect is nearly unchanged between glacial maxima and interglacial periods. The small variability in the Dole effect suggests that relative rates of primary production in the land and marine realms have been relatively constant. Most periodic variability in the Dole effect is in the precession band, suggesting that changes in this global biogeochemical term reflects variations in low-latitude land hydrology and productivity or possibly variability in low-latitude oceanic productivity.