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:12/6/2016)... Dec. 6, 2016 Valencell , the leading ... has seen a third consecutive year of triple digit ... in 2016 with a 360 percent increase in companies ... increase was driven by sales of its wrist and ... in its technology for hearables for fitness and healthcare ...
(Date:12/2/2016)... India , December 1, 2016 ... Authentication type (Fingerprint, Voice), Future Technology (Iris Recognition ... and Region - Global Forecast to 2021", published ... USD 442.7 Million in 2016, and is projected ... at a CAGR of 14.06%.      ...
(Date:11/30/2016)... Nov. 30, 2016  higi SH llc (higi) ... initiative targeting national brands, industry thought-leaders and celebrity ... respective audiences for taking steps to live healthier, ... in 2012, higi has built the largest self-screening ... 38 million people who have conducted over 185 ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... -- Partnering to fuel Philadelphia,s innovative ... Southeastern Pennsylvania (" Ben Franklin "); ... Blue Cross; and Safeguard Scientifics ("Safeguard") (NYSE: ... million funding initiative over a four year period to ... a burgeoning economic vitality in digital health, Ben ...
(Date:12/7/2016)... ... December 07, 2016 , ... ACEA Biosciences, ... escalation and expansion clinical trial for its lead drug candidate, AC0010, at the ... the trial was to determine the safety, antitumor activity, and recommended phase II ...
(Date:12/7/2016)... ... 07, 2016 , ... Huffman Engineering, Inc. , a ... Certified System Integrator Partner. Huffman Engineering is the only Nebraska-based company recognized ... Integrator Partner certification gives customers confidence that our engineers are fully trained and ...
(Date:12/7/2016)... - OncoQuest Inc. ("OncoQuest"), a biopharmaceutical company focused ... for the treatment of cancer, today announced that ... Program with Cytovance Biologics ( Oklahoma City, ... product. Supported by recent positive interim clinical results ... cancer patients, OncoQuest has engaged Cytovance to establish ...
Breaking Biology Technology: