Mississippi Basin nitrogen flux believed to cause Gulf hypoxia
نویسندگان
چکیده
منابع مشابه
Nitrogen flux and sources in the Mississippi River Basin.
Nitrogen from the Mississippi River Basin is believed to be at least partly responsible for the large zone of oxygen-depleted water that develops in the Gulf of Mexico each summer. Historical data show that concentrations of nitrate in the Mississippi River and some of its tributaries have increased by factors of 2 to more than 5 since the early 1900s. We have used the historical streamflow and...
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The effects of nutrient loading from the Mississippi River basin on the areal extent of hypoxia in the northern Gulf of Mexico were examined using a novel application of a dissolved oxygen model for a river. The model, driven by river nitrogen load and a simple parameterization of ocean dynamics, reproduced 17 yr of observed hypoxia location and extent, subpycnocline oxygen consumption, and cro...
متن کاملGulf of Mexico hypoxia: exploring increasing sensitivity to nitrogen loads.
Hypoxia is a critical issue in the Gulf of Mexico that has challenged management efforts in recent years by an increase in hypoxia sensitivity to nitrogen loads. Several mechanisms have been proposed to explain the recent increase in sensitivity. Two commonly cited mechanisms are bottom-water reducing conditions preventing nitrification and thus denitrification, leading to more N recycling and ...
متن کاملRelating net nitrogen input in the Mississippi River basin to nitrate flux in the lower Mississippi River: a comparison of approaches.
A quantitative understanding of the relationship between terrestrial N inputs and riverine N flux can help guide conservation, policy, and adaptive management efforts aimed at preserving or restoring water quality. The objective of this study was to compare recently published approaches for relating terrestrial N inputs to the Mississippi River basin (MRB) with measured nitrate flux in the lowe...
متن کاملHow climate controls the flux of nitrogen by the Mississippi River and the development of hypoxia in the Gulf of Mexico
The intensification of agriculture in the central U.S. is commonly cited as the primary cause of the increase in nitrogen (N) flux by the Mississippi River since the 1950s and the development of seasonal bottom-water hypoxia in the northern Gulf of Mexico. Over the past two decades, however, agricultural land use and land cover have remained relatively constant. With high N inputs each year, cl...
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ژورنال
عنوان ژورنال: Eos, Transactions American Geophysical Union
سال: 2000
ISSN: 0096-3941
DOI: 10.1029/00eo00244