Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico

Article Abstract:

A new mass-balance method has been used to estimate nitrogen flux through the interior watersheds of the Mississippi basin. The method was amended to quantify more exactly nitrogen transport in large channels. It was possible to identify a rapid fall in the average first-order rate of nitrogen loss with channel size. The nitrogen-loss rate in streams falls rapidly with rising channel size, and knowledge of the length of time that surface waters are transported through channels of different sizes can therefore assist in predicting the quantities of nitrogen delivered from interior sites to coastal waters.

Water, Nitrogen (Chemical element), Water chemistry, Mississippi River

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Oil and combustion-product contamination of the Gulf marine environment following the war

Article Abstract:

A survey of hydrocarbon contamination of the Persian Gulf region found that the 1991 Gulf war's environmental ravages were not especially extreme. Severe oil pollution was limited to Saudi Arabian coastal areas within about 400 kilometers of spillages. Moreover, most of the spilled oil had broken down by Jun 1991. The decline in hydrocarbon pollution and the rise in the bivalve mollusk population probably reflected the war-linked drop in oil tanker traffic. Hydrocarbon contamination of sediments due to oil well fires was actually low compared to what is found in industrialized regions.

Cover Story, Middle East, Pollution, Fires, Oil spills, Persian Gulf War, 1991, Oil wells, Persian Gulf, Persian Gulf region, Oil well fires

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Fortnightly variations in the flow velocity of Tutford Ice Stream, West Antarctica

Article Abstract:

A study shows that the surface velocities on a major West Antarctica Ice Stream, Rutford ice stream, vary periodically by about 20 percent every two weeks as a result of tidal forcing. Finding show that the existence of strong fort-nightly variations in flow demonstrates the potential pitfalls on using repeated velocity measurements over intervals of days to infer long-term change.

Antarctica, Analysis, Ice caps, Flow (Dynamics)

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