Navigation Links
Sink or source? A new model to measure organic carbon in surface waters
Date:3/4/2011

A new carbon model allows scientists to estimate sources and losses of organic carbon in surface waters in the United States. Study results indicate that streams act as both sources and sinks for organic carbon.

"Model estimates help managers and researchers track carbon transport in streams, which is information that is ultimately needed to improve our understanding of the fate of rising carbon dioxide levels in the atmosphere," said Dr. Richard Smith, a USGS hydrologist and coauthor of the study. "The study contributes new information on the role of rivers as sources and sinks for organic carbon at regional and continental scales, for which scientific knowledge is rather limited."

Findings show that in-stream photosynthesis by algae is a major contributor of organic carbon in large rivers of the United States. It is the largest source of organic carbon delivered to coastal waters from the Mississippi-Atchafalaya River Basin and the Pacific Northwest.

Terrestrial sources of carbon, such as from forests and wetlands, are dominant in all other coastal waters, including waters of the North Atlantic, the South Atlantic Gulf, California, the Texas Gulf, and the Great Lakes.

The results also provide estimates of how much of the organic carbon transported in streams is then permanently removed from the water column. The removed carbon is either sequestered in sediments over long time periods or oxidized and returned to the atmosphere as carbon dioxide. The specific fate of the carbon is not quantified in the current model.

Study findings are estimated using a hydrological mass-balance model based on long-term monitoring at 1,125 stream locations and national geospatial information, including a river network of approximately 62,000 reaches and their connecting drainages, land cover, climate, soils, and estimates of the supply of carbon to streams from primary production.


'/>"/>

Contact: Richard Smith
rsmith1@usgs.gov
703-648-6870
United States Geological Survey
Source:Eurekalert

Page: 1

Related biology news :

1. Wood stoves -- a viable home heat source?
2. UofL biostatistician to develop statistical model that could help answer medical questions
3. DOE grant joins climate modeling with local, regional empirical data
4. Study shows rapamycin reverses myocardial defects in mouse model of LEOPARD syndrome
5. Modell Chair in Pediatric Immunology established
6. New model reveals pesticide-free method that takes a bite out of mosquito-borne disease
7. New discoveries improve climate models
8. Mathematical model could help predict and prevent future extinctions
9. Purdue team creates engineered organ model for breast cancer research
10. Go figure: Math model may help researchers with stem cell, cancer therapies
11. Simple, ingenious way to create lab-on-a-chip devices could become a model for teaching and research
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/4/2017)... BLOOMINGTON, Ill. , Oct. 4, 2017  GCE Solutions, a ... powerful new data and document anonymization solution on October 4, 2017. ... the pharmaceutical field to comply with policy 0070 of the European ... documents and data. ... Innovation by GCE Solutions ...
(Date:8/15/2017)... 2017   ivWatch LLC , a medical device company focused ... announced receipt of its ISO 13485 Certification, the global standard for ... for Standardization (ISO®). ... 400 Continuous Monitoring device for the early detection of IV infiltrations. ... "This is an important milestone for ivWatch, ...
(Date:6/30/2017)... Today, American Trucking Associations announced Seeing ... and eye tracking software, became the newest member ... "Artificial intelligence and advanced sensing algorithms ... driver,s attentiveness levels while on the road.  Drivers ... fatigue and prevent potential accidents, which could lead ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... (PRWEB) , ... October 12, 2017 , ... ... for two-dimensional representations of a complex biological network, a depiction of a system ... big mess,” said Dmitry Korkin, PhD, associate professor of computer science at Worcester ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... Market with the addition of its newest module, US Hemostats & Sealants. , ... thrombin hemostats, absorbable hemostats, fibrin sealants, synthetic sealants and biologic sealants used in ...
(Date:10/11/2017)... , ... October 11, 2017 , ... ... gene in its endogenous context, enabling overexpression experiments and avoiding the use of ... small RNA guides is transformative for performing systematic gain-of-function studies. , This ...
(Date:10/11/2017)... BioMarketing, a leading provider of patient support solutions, has announced ... network, which will launch this week. The VMS CNEs will ... to enhance the patient care experience by delivering peer-to-peer education ... professionals to help women who have been diagnosed and are ... ...
Breaking Biology Technology: