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Book Spatial Distribution of Nutrients in the Mississippi River System 1991 1992

Download or read book Spatial Distribution of Nutrients in the Mississippi River System 1991 1992 written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Concentrations of dissolved nutrients (nitrate, nitrite, ammonium and orthophosphate) were measured on surface-water grab samples collected at ten mile intervals along the entire length of the navigable portion of the Mississippi River during three cruises in June?July 1991, September?October 1991 and March? April 1992. Samples were also collected at the mouths of some of the major tributaries and, at selected points, three-sample cross sections were collected across the river to measure cross-channel variability. Simultaneously with collecting each sample, the discharge of the Mississippi River was estimated, permitting the calculation of the nutrient load in the Mississippi River at each sample point. The large number of samples collected (between 179 and 207 per cruise) give a picture of the instantaneous longitudinal variation of nutrients in the Mississippi River during three different seasons. Both nitrate and orthophosphate loads appear to increase or remain constant downriver for each cruise, indicating that mechanisms for the removal of these compounds are not as rapid as their introduction into the river. In addition, below the confluence of most of the major tributaries, the loads show a?step? increase caused by the nitrate and orthophosphate contributions from the tributaries. From this data, one can identify the possible sources of nitrate and orthophosphate arriving at the Gulf of Mexico from the Mississippi River. During each of the three cruises (at three different seasons), the majority of the nitrate and ortho-phosphate appears to have originated from the Upper Mississippi River Basin, above the con-fluence of the Missouri River. Ammonium and nitrite loads appear to originate as point-sources, but disappear within approximately one hundred miles of their introduction, probably as a result of conversion to nitrate and/or nitrogen gas. Any nitrite or ammonium from the Mississippi River deposited into the Gulf of Mexico therefore probably originated within one hundred miles of the Gulf.

Book Pesticide Nutrient Water discharge and Physical property Data for the Mississippi River and Some of Its Tributaries April 1991 September 1992

Download or read book Pesticide Nutrient Water discharge and Physical property Data for the Mississippi River and Some of Its Tributaries April 1991 September 1992 written by and published by . This book was released on 1995 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Contaminants in the Mississippi River 1987 92

Download or read book Contaminants in the Mississippi River 1987 92 written by Geological Survey (U.S.) and published by . This book was released on 1995 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Nutrient Control Actions for Improving Water Quality in the Mississippi River Basin and Northern Gulf of Mexico

Download or read book Nutrient Control Actions for Improving Water Quality in the Mississippi River Basin and Northern Gulf of Mexico written by National Research Council and published by National Academies Press. This book was released on 2009-07-13 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large area of coastal waters in the northern Gulf of Mexico experiences seasonal conditions of low levels of dissolved oxygen, a condition known as hypoxia. Excess discharge of nutrients into the Gulf of Mexico from the Mississippi and Atchafalaya rivers causes nutrient overenrichment in the gulf's coastal waters and stimulates the growth of large algae blooms. When these algae die, the process of decomposition depletes dissolved oxygen from the water column and creates hypoxic conditions. In considering how to implement provisions of the Clean Water Act to strengthen nutrient reduction objectives across the Mississippi River basin, the U.S. Environmental Protection Agency (EPA) requested advice from the National Research Council. This book represents the results of the committee's investigations and deliberations, and recommends that the EPA and U.S. Department of Agriculture should jointly establish a Nutrient Control Implementation Initiative to learn more about the effectiveness of actions meant to improve water quality throughout the Mississippi River basin and into the northern Gulf of Mexico. Other recommendations include how to move forward on the larger process of allocating nutrient loading caps-which entails delegating responsibilities for reducing nutrient pollutants such as nitrogen and phosphorus-across the basin.

Book Pesticide Nutrient Water discharge and Physical property Data for the Mississippi River and Some of Its Tributaries April 1991 September 1992

Download or read book Pesticide Nutrient Water discharge and Physical property Data for the Mississippi River and Some of Its Tributaries April 1991 September 1992 written by Richard Henry Coupe and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book U S Geological Survey Circular

Download or read book U S Geological Survey Circular written by and published by . This book was released on 1984 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Impact of Climate and Land Use on Nitrate Export by the Mississippi River

Download or read book The Impact of Climate and Land Use on Nitrate Export by the Mississippi River written by Simon David Donner and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 2002 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Biogeochemical Dynamics at Major River Coastal Interfaces

Download or read book Biogeochemical Dynamics at Major River Coastal Interfaces written by Thomas Bianchi and published by Cambridge University Press. This book was released on 2014 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.

Book Oceanography and Marine Biology An Annual Review Volume 40

Download or read book Oceanography and Marine Biology An Annual Review Volume 40 written by R. N. Gibson and published by CRC Press. This book was released on 2002-08-29 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in oceanography and marine biology and its relevance to global environmental issues continues to increase, creating a demand for authoritative reviews that summarize recent research. Oceanography and Marine Biology: An Annual Review has catered to this demand since its foundation, by the late Harold Barnes, more than 40 years ago. It is an

Book Mississippi River Water Quality and the Clean Water Act

Download or read book Mississippi River Water Quality and the Clean Water Act written by National Research Council and published by National Academies Press. This book was released on 2008-03-08 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mississippi River is, in many ways, the nation's best known and most important river system. Mississippi River water quality is of paramount importance for sustaining the many uses of the river including drinking water, recreational and commercial activities, and support for the river's ecosystems and the environmental goods and services they provide. The Clean Water Act, passed by Congress in 1972, is the cornerstone of surface water quality protection in the United States, employing regulatory and nonregulatory measures designed to reduce direct pollutant discharges into waterways. The Clean Water Act has reduced much pollution in the Mississippi River from "point sources" such as industries and water treatment plants, but problems stemming from urban runoff, agriculture, and other "non-point sources" have proven more difficult to address. This book concludes that too little coordination among the 10 states along the river has left the Mississippi River an "orphan" from a water quality monitoring and assessment perspective. Stronger leadership from the U.S. Environmental Protection Agency (EPA) is needed to address these problems. Specifically, the EPA should establish a water quality data-sharing system for the length of the river, and work with the states to establish and achieve water quality standards. The Mississippi River corridor states also should be more proactive and cooperative in their water quality programs. For this effort, the EPA and the Mississippi River states should draw upon the lengthy experience of federal-interstate cooperation in managing water quality in the Chesapeake Bay.

Book 1994 Ocean Sciences Meeting

Download or read book 1994 Ocean Sciences Meeting written by and published by . This book was released on 1994 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: