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Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Edition: Not provided
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place:
Publisher:
Other_Citation_Details:
Online_Linkage:
Description:
Abstract:
Important to our understanding of marine biogeochemistry and climates cycles is the transfer to depth of particulate organic carbon (C) via the biological pump. The surface and mesopelagic zones (upper 1000 m) are of crucial significance in determining the efficiency of the transfer and the fate of biogenic material, since mineralization length scales are important indicators of the capacity of intermediate layers for longer term C sequestration. A quantitative representation of this process is thus essential to every simulation of the oceans’ role in the global C cycle. The particulate barium barite (Ba-BaSO4) in suspended matter is a proxy of C mineralization fluxes. The picture emerging today is that barite precipitation takes place inside micro-environments (e.g. biogenic aggregates) sinking out of the surface layers into mesopelagic waters. Barite formation appears closely linked (directly or indirectly) with prokaryotic degradation of Organic Matter (OM) and thus with C remineralization rate. As revealed by barite proxy in contrasting environments, the extent of mesopelagic C mineralization appears closely linked to specific ecosystem’s characteristics (e.g. differences in phytoplankton community composition, grazing pressure, trophic interactions and types of aggregates formed). However, we are still far from a detailed understanding of the processes controlling formation and fate of aggregates beyond the surface layer. Indeed, uncertainties both on particles and plankton communities characteristics and on the exact processes controlling barite precipitation are limiting our understanding of particle formation, transport and fate, thereby impeding both a predictive understanding of the flux of organic C to the deep and a wider use of the barite proxy. Here we point out the need for a mechanistic understanding of the barite formation process and of the Ba trace-element cycle in order to validate both the modern and paleo–applications. Overall, the factors controlling the whole processes reported above need to be better constrained, especially at meso- and submeso- scale. It is clearly a challenge to connect the flux of sinking particles to surface water processes and to assess their variability with regards to climate and anthropogenic changes. In this context, the BIOBAM project (Bio-Ogano-Minéralization de la BArytine en Zone Mésopélagique) will focus for the first time on the black box of subsurface & mesopelagic particles fluxes in order to provide a better understanding of the link between the processes of barite formation, degradation and remineralization of OM and the characteristics of exported particles, and their dependency on ecosystems structure. In particular, BIOBAM will investigate the role of minerals, planktonic and prokaryotic communities and hydrostatic pressure on both (i) the variability of exported biogenic materials and C remineralization processes in the mesopelagic and (ii) the subsequent barite precipitation inside these micro-environments. Indeed, while previous in vivo experiments of barite precipitation and OM degradation (most of them unsuccessful) and of particles aggregation have all been performed under atmospheric pressure, we will realized in this project close to in situ experiments, using pressure-controlled batch-incubation to simulate particles sinking throughout the mesopelagic zone.
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19700101
Ending_Date: Unknown
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: Not Available
East_Bounding_Coordinate: Not Available
North_Bounding_Coordinate: Not Available
South_Bounding_Coordinate: Not Available
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON
Theme_Keyword: IMBER > INTEGRATED MARINE BIOGEOCHEMISTRY AND ECOSYSTEM RESEARCH
Theme_Keyword: NULL
Theme_Keyword: ENGLISH
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: STÉPHANIE JACQUET
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: LOPB - Centre d’Océanologie de Marseille, UMR6535, Campus de Luminy, Case 901
City: MARSEILLE
State_or_Province: Cedex 9
Postal_Code: 13288
Country: France
Contact_Voice_Telephone: +33491829337
Contact_Facsimile_Telephone: +33491826548
Contact_Electronic_Mail_Address: stephanie.jacquet@univmed.fr
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: LOBP > Centre d'Océanologie de Marseille
Contact_Person: STÉPHANIE JACQUET
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: LOPB - Centre d’Océanologie de Marseille, UMR6535, Campus de Luminy, Case 901
City: MARSEILLE
State_or_Province: Cedex 9
Postal_Code: 13288
Country: France
Contact_Voice_Telephone: +33491829337
Contact_Facsimile_Telephone: +33491826548
Contact_Electronic_Mail_Address: stephanie.jacquet@univmed.fr
Resource_Description: BIOBAM
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.bariteco.com
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.bariteco.com
Access_Instructions:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20110909
Metadata_Review_Date: 20180813
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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