منابع مشابه
Inferring upwelling rates in the equatorial Atlantic using Be measurements in the upper ocean
Ocean upwelling rates are difficult to measure because of the relatively small velocities involved, and therefore are typically inferred from indirect methods such as heat budget estimates or tracer observations. Here we present the first results using a novel technique, based on the isotope Be, to infer rates of upwelling along the equator. Beryllium-7 (half-life1⁄453.3 d) is a cosmic-ray prod...
متن کاملEstimates of Equatorial Upwelling Between 140 and 110W During 1984
The equation of continuity is used to estimate profiles of vertical velocity between 25 and 120 m from moored current measurements in arrays nested within the triangle with vertices located at 1ø30'S, 140øW and along the equator at 140 ø and 110øW during December 1983 through March 1984 and May-September 1984. All directions of the 4to 5-month mean values were upward. The ensemble averaged mean...
متن کاملVariability of upwelling and chlorophyll in the equatorial Atlantic
Abstract The primary seasonal phytoplankton bloom in the equatorial Atlantic occurs in boreal summer in response to seasonal strengthening of zonal winds. However, the equatorial Atlantic also has a secondary bloom in late fall – early winter. This secondary bloom is weaker than the primary bloom by a factor of two, but is subject to year-to-year variability that is similar in magnitude. Here, ...
متن کاملExtratropical sources of Equatorial Pacifie upwelling in an OGCM
[1] The extratropical sources of equatorial undercurrent (EUC) water have been identified for an ocean circulation model using Lagrangian trajectory analysis, lt has been found that the EUe waters emenate from a wide range of latitudes in the Pacific basin, with its densest constituent watennass being Subantarctic Mode Water (SAMW) from 50S, Further analysis of the basin-scale circulation field...
متن کاملEquatorial upwelling enhances nitrogen fixation in the Atlantic Ocean
[1] Surface waters in upwelling regions are thought to be nutrient rich and hence inhibit nitrogen fixation (diazotrophy) because diazotrophs can preferentially assimilate nitrate and ammonia instead of expending energy to fix dinitrogen. We found average nitrogen fixation rates to be two to seven times higher in the surface waters of the upwelling region of the eastern equatorial Atlantic than...
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ژورنال
عنوان ژورنال: Nature
سال: 1979
ISSN: 0028-0836,1476-4687
DOI: 10.1038/278307b0