WATER DISCHARGE, NITRATE CONCENTRATION AND NITRATE FLUX IN THE LOWER MISSISSIPPI RIVER

被引：7

作者：

DINNEL, SP

BRATKOVICH, A

机构：

[1] Center for Marine Science, University of Southern Mississippi, Stennis Space Center

[2] NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI 48105

来源：

JOURNAL OF MARINE SYSTEMS | 1993年 / 4卷 / 04期

基金：

美国海洋和大气管理局;

关键词：

D O I：

10.1016/0924-7963(93)90027-J

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Thirty-five years of monthly lower Mississippi River water discharge, nitrate concentration and nitrate flux have been analyzed. The potential predictability of these quantities has been evaluated. Results indicate a large amplitude, long-term cycle in the nitrate concentration that is not observed in the water discharge. A decrease in average nitrate concentration from a peak in 1983 to the present confirms that this variability is more cyclic than trend-like. River-water discharge variation was greatest in association with the annual cycle. The annual water discharge and nitrate concentration cycles were similar; high nitrate concentrations usually occurred near the vernal freshet, and low concentrations usually occurred along with autumnal low-flow conditions. Nitrate flux variations exhibited a low amplitude, long-term modulation of a dominant, annual cycle. A predictor-hindcast analysis indicates that truly skilled forecasts of all three fields are feasible.

引用

页码：315 / 326

页数：12

共 23 条

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