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Equatorial ocean circulation in an extremely warm climate

机译：在极端温暖的气候中的赤道海洋环流

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摘要

The warm climates of the early Paleogene and the associated diminished near-surface winds should have resulted in a reduction in near-surface ocean circulation. One check on this deduction is the delineation of biogenic sediments associated with an equatorial current system of the early Eocene Pacific. A latitudinal seismic reflection transect across the tropical Pacific along early Paleogene ocean crust reveals a basal high-amplitude reflection package that we take to be the lower Eocene section. This unit varies in thickness by a factor of about two, with the thickest portion forming a low mound some 3°-4°north of the 56 Ma paleoequator. This mound may represent the position of a divergence generated in the frontal region between two currents flowing in opposite directions, and its position suggests that the wind-driven equatorial circulation of the early Eocene was one without a pronounced equatorial divergence.
机译：古近纪早期的温暖气候和相关的近地表风减少，本应导致近地表海洋环流的减少。对这一推论的一种检查是划定与始新世早期的赤道流系统有关的生物成因沉积物。沿着古近纪早期洋壳横穿热带太平洋的横向地震反射断面揭示了一个基性高振幅反射包裹，我们将其作为始新世下部。这个单元的厚度变化大约两倍，最厚的部分在56 Ma古赤道以北3°-4°处形成一个低丘。该土墩可能代表了在相反方向流动的两个洋流之间在额叶区域中产生的发散位置，其位置表明早期始新世的风动赤道环流没有明显的赤道发散。

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