MARGINS SOURCE-TO-SINK S2S Program Goals S2S Focus Sites S2S TEI - Success-To-Date Community...
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Transcript of MARGINS SOURCE-TO-SINK S2S Program Goals S2S Focus Sites S2S TEI - Success-To-Date Community...
MARGINS SOURCE-TO-SINKMARGINS SOURCE-TO-SINK
S2S Program Goals S2S Focus Sites S2S TEI - Success-To-Date Community Sediment Model
S2S Program Goals S2S Focus Sites S2S TEI - Success-To-Date Community Sediment Model
1. How do tectonics, climate, sea level fluctuations, and other forcing parameters regulate the production, transfer, and storage of sediments and solutes from their sources to their sinks?
2. What processes initiate erosion and sediment transfer, and how are these processes linked through feedbacks?
3. How do variations in sediment processes and fluxes and longer-term variations such as tectonics and sea level build the stratigraphic record to create a history of global change?
SOURCE-TO-SINK (S2S) CONCEPT
GULF OF PAPUA FOCUS SITE
MD 37
MD 40
MD 31
MD 38MD 39
MD 42
MD 30
MD 47
MD 48
MD 46
MD 50
MD 49
MD 41
MD 34
MD 44
MD 45
MD 43
JPC 66
JPC 33
Eastern Plateau
Moresby Trough
Ash
mo
reT
rou
gh
Pand
ora
Trou
gh
CORAL SEA
PAPUASHELF
PAPUA LAND
PortlockReef
Boot Atoll
AshmoreAtoll
Eastern FieldsAtoll
Gre
at
50 km
Puari River
Turama River
Bamu River
Fly River
SHEL
F ED
GE
Bar
rier
Reef
SHEL
F ED
GE
LGM
Coa
stlin
e
LGM Coastline
Holoce
ne
Clinofo
rm
NEW ZEALAND FOCUS SITE
S2S TEI - NORTHERN CALIFORNIASeptember 18-22, 2006
1. Rolling venue, beginning in Marin County, Ca. and ending in Eureka, Ca., with ~80 attendees (mix of professionals and grad students);
2. Six keynote speakers (45-60 minutes each):• Jame Syvitski (INSTAAR) - Promise of S2S• Bill Dietrich (UC-Berkeley) - Source Processes• John Milliman (VIMS) - Sediment Routing• Chuck Nittrouer (U. Washington) - Shelf Processes• Sam Bentley (Memorial U.) and Andre Droxler (Rice U.) - Slope, Deepwater
and Carbonate Sedimentation• John Swenson (U. Minnesota) - S2S Teleconnections
3. A series of shorter (10+ minutes) thematic talks. Three to four short talks after each keynote, followed by 30-60 minutes of open discussion;
• Integrated technical sessions and field trips. One day of sessions, followed by a traverse through the Eel River drainage basin, en route from Marin County to Eureka. Two days of technical sessions, plus a morning field trip to visit coastal cliff exposures of uplifted ancestral Eel River and Eel shelf strata;
• Breakout group meetings to discuss successes, gaps/needs, and opportunities
Sediment fluxes off the hillslope
(the source)
Bill Dietrich, UC-Berkeley Issues What is a Hillslope? Processes Rates Prediction Concluding comments
Note: This is not an analysis of sediment discharge to the oceans
FATE OF FLUVIAL SEDIMENTS ON SHELVES:PUTTING ACTIVE MARGINS INTO
PERSPECTIVE
Chuck Nittrouer, University of Washington
Sediment supply:riverglacier (tide
water)
Clark Alexander Tina Drexler Brent McKee Pere Puig Mead Allison John Jaeger Beth Mullenbach Chris Sommerfield Sam Bentley Steve Kuehl Andrea Ogston Dick Sternberg John Crockett Preston Martin Cindy Palinkas JP Walsh Dave DeMaster
Sediment type:siliciclasticcarbonate
Teleconnections in the Source-to-Sink SystemJohn Swenson, University of Minnesota Duluth
La Nina anomalous SL pressure
Strong statistical relationship between ‘weather’ in different
parts of the globe
Information propagates through the atmosphere
Long-distance propagation of allogenic forcing (e.g. sea level change) through the transport system via erosion and deposition on geologic time scales
CURRENT S2S PROGRAM SUCCESSES1. Development of S2S as a paradigm - S2S concept has become much broader
than the MARGINS Program, and now permeates academic and industrial teaching and research efforts in the US, and other countries have developed their own programs of this kind;
2. Fostering of a community surface dynamics modeling effort - will facilitate teaching and research far beyond the MARGINS Program;
3. S2S system knowledge-transfer - allows NSF core-program studies to succeed where they otherwise wouldn’t even have been conceived;
4. Collection and archiving of large comprehensive datasets - now available to the entire community at http://www.marine-geo.org/margins/
5. Education of graduate students - new techniques and broader scientific concepts in a learning environment of diverse researchers;
6. Recognition that timing of river & ocean events is fundamental - critical to understanding margin sediment dynamics and dispersal processes;
7. Refinement of Historic and Holocene sediment budgets - budgets emerging for both focus sites, at least in a gross anatomical sense;
SEDIMENT DISPERSAL SYSTEMS:SOURCE-TO-SINK
Sediment Budget Using 210Pb Accumulation Rates
Sediment Budget Using 210Pb Accumulation Rates
38% of sediment preserved on shelf
400 m
Courtesy of Neal Driscoll
Modern sedimentation over old clinoform
(across-shelf view)
OPPORTUNITIES1. Increased use of tracers - cosmogenic radionuclides, OC, luminescence, and
others can be used to track sediments through system, develop chronological links between source and sink, and rates of signal transfer and strata formation;
2. Use of LIDAR - LIDAR can be used to develop more precise topographic, process, and landscape evolution models;
3. Next-generation deep cores - needed to understand the longer-term stratigraphic record of source-to-sink;
2. Develop links between S2S and other NSF programs - such as Orion, Venus (Victoria Experimental Network under the Sea) data/equipment;
3. Opportunities to develop rapid response infrastructure - improve community capabilities to monitor sediment dispersal through major events, which would be portable to other areas, and serve model development;
4. Opportunities to leverage industry interests and resources - if the program were packaged in a slightly broader temporal framework; and
2. Exploit the environmental record of lake sediments - possible at both focus sites to develop independent records of climate change and climate forcing.
3. Opportunity to Link S2S with Environmental Change Research - S2S can play an important role in discussions of the responses of the Earth surface to climate and environmental change
JGR SPECIAL ISSUE ON PNG
The Papuan Continuum: Source to Sink through the Fly River System and the Gulf of Papua
Co-editors: Chuck NittrouerRudy Slingerland,Jerry Dickens,Gary Parker
1 overview (Nittrouer) plus 22 technical papers, that cover a spectrum of issues, including source processes, sediment transfer and deposition in the sink, and cycling of carbon and other biorelevant material
COMMUNITY SEDIMENT MODEL
Status and Next Steps
Lead PI/Institution: J. Syvitski/INSTAAR, CU
• INSTAAR CSM proposal has been funded.– Lead institution for multi-institution effort.
• Cooperative agreement w/ other institutions now being assembled.– Steering committee (Head: Slingerland, PSU)– IT/Numerics working group (Head: Furbish, Vandy)– Marine working group (Head: Wiberg, UVA)– Terrestrial working group (Head: Tucker, CU)– Coastal working group (Head: Murray, Duke(?))– Education working group (Head: TBD)
• Other partnerships in works:– International Partners Committee– Industrial Partners Committee– Federal Inter-Agency Partners Committee