Beaufort L, Lancelot Y, Camberlin P, Cayre O, Vincent E, Bassinot F, Labeyrie L
L. Beaufort, Y. Lancelot, O. Cayre, E. Vincent, Laboratoire de Geologie du Quaternaire du CNRS, CEREGE, Boite Postale 80, 13545 Aix-en-Provence Cedex 4, France. P. Camberlin, Centre de Recherches de Climatologie, Universite de Bourgogne, Boi.
Science. 1997 Nov 21;278(5342):1451-4. doi: 10.1126/science.278.5342.1451.
Analysis of a continuous sedimentary record taken in the Maldives indicates that strong primary production fluctuations (70 to 390 grams of carbon per square meter per year) have occurred in the equatorial Indian Ocean during the past 910,000 years. The record of primary production is coherent and in phase with the February equatorial insolation, whereas it shows diverse phase behavior with delta18O, depending on the orbital frequency (eccentricity, obliquity, or precession) examined. These observations imply a direct control of productivity in the equatorial oceanic system by insolation. In the equatorial Indian Ocean, productivity is driven by the wind intensity of westerlies, which is related to the Southern Oscillation; therefore, it is suggested that a precession forcing on the Southern Oscillation is responsible for the observed paleoproductivity dynamics.
对马尔代夫获取的一份连续沉积记录进行分析表明，在过去91万年里，赤道印度洋出现了强烈的初级生产力波动（每年每平方米70至390克碳）。初级生产力记录与2月赤道日照一致且同步，而与δ18O呈现出不同的相位行为，这取决于所研究的轨道频率（偏心率、倾角或岁差）。这些观测结果表明日照对赤道海洋系统的生产力有直接控制作用。在赤道印度洋，生产力受西风带风强度驱动，而西风带风强度与南方涛动有关；因此，有人提出，南方涛动上的岁差强迫是观测到的古生产力动态的原因。
