Showing posts with label Geological Processes. Show all posts
Showing posts with label Geological Processes. Show all posts

Sunday, May 12, 2019

Large single-cell organisms found on past marine sediments

Past organisms living on sediments

Wednesday, May 6, 2015

Denitrification, Anammox, and N2 Production in Marine Sediments

Interesting and recently published paper on Nitrogen-cycling in marine sediments!


Denitrification, Anammox, and N2 Production in Marine Sediments


Annual Review of Marine ScienceVol. 7: 403-423 (Volume publication date January 2015)DOI: 10.1146/annurev-marine-010213-135040Allan H. DevolSchool of Oceanography, University of Washington, Seattle, Washington 98195-5351; email: devol@u.washington.edu


Abstract: Fixed nitrogen limits primary productivity in many parts of the global ocean, and it consequently plays a role in controlling the carbon dioxide content of the atmosphere. The concentration of fixed nitrogen is determined by the balance between two processes: the fixation of nitrogen gas into organic forms by diazotrophs, and the reconversion of fixed nitrogen to nitrogen gas by denitrifying organisms. However, current sedimentary denitrification rates are poorly constrained, especially in permeable sediments, which cover the majority of the continental margin. Also, anammox has recently been shown to be an additional pathway for the loss of fixed nitrogen in sediments. This article briefly reviews sedimentary fixed nitrogen loss by sedimentary denitrification and anammox, including in sediments in contact with oxygen-deficient zones. A simple extrapolation of existing rate measurements to the global sedimentary denitrification rate yields a value smaller than many existing measurement-based estimates but still larger than the rate of water column denitrification.




You can visit Annual Reviews WebSite for more information

Monday, December 22, 2014

8th International Conference on Remediation and Management of Contamined Sediments

Conference Highlights
Monday, January 12


·         10 Short Courses
·         Exhibits open, Welcome Reception, Group 1 Poster Display
·         Plenary Session, with feature speaker Anthony C. Janetos (Boston University), “The National Climate Change Assessment: Climate Change Impacts in the United States and Beyond.”
Tuesday-Thursday, January 13-15
·         Nearly 500 platform talks and poster presentations scheduled in 51 breakout sessions 
·         4 panel discussions
·         70+ exhibitors
·         Student Mixer
·         Multiple networking opportunities: daily continental breakfasts, lunches, and poster receptions.
·         Closing Roundtable Forum—“The Billion-Dollar Question: Can Urban Master Planning Help Resolve the Cost/Benefit Impasse at Large Contaminated Sediment Sites?”
See the Daily Schedule for a quick, 2-page overview of the sessions and panels scheduled each day. The Technical Program lists the title, authors, and scheduled speaker for each presentation and the scope and panelists for each panel.
The technical program was developed after an extensive, multi-level review by the Program Committee and the session chairs of more than 500 abstracts received in response to the Call for Abstracts.

 


Further information here

Friday, September 6, 2013

Friday, July 22, 2011

Linking the Time and Space Scales of Chemical Oceanography

August 14-19, 2011
Proctor Academy
Andover, NH

Sessions:
[SUNDAY]
The Gulf of Mexico Oil Spill: A Status Report
[MONDAY]
The Marine Phosphorus Cycle: Past, Present and Future
New Insights into the Marine Nitrogen Cycle

[TUESDAY]
Chemical Oceanography in Deep Time
Glacial-Interglacial Changes in Ocean Chemistry

[WEDNESDAY]
Trace Element Cycling in the Ocean: Biotic Influences and Responses
Submarine Groundwater Discharge

[THURSDAY]
Carbon Processing in the Coastal Ocean
Biogeochemical Processes in Marine Sediments Across Space and Time

Goldschmidt 2011, Earth, Life and Fire, Prague, Czech Republic






















Themes and Sessions

The Science Committee, chaired by Bernard Marty and Bernard Bourdon, have organised the following themes and sessions for Goldschmidt2011, which incorporates many sessions submitted during the public "Call for Sessions".


Further information here