How changes in ice cover, permafrost and UV radiation impact on biodiversity and biogeochemical fluxes in the Arctic Ocean?

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Publication_Date: Unknown
Title: How changes in ice cover, permafrost and UV radiation impact on biodiversity and biogeochemical fluxes in the Arctic Ocean?
Description:
Abstract:
We currently witness in the Arctic: 1) a decrease in summer ice cover that exposes sea surface to solar radiation and physical forcings, 2) permafrost thawing and increased river runoff, both leading to an increase in the export to ocean of organic carbon previously sequestered in the Tundra, 3) an increase in ultraviolet radiation. These three phenomena favour a growing mineralization of organic carbon through photo-oxidation and bacterial activity, resulting in an amplification of the increase in atmospheric CO2. At the same time, the exposure of a larger fraction of ocean surface to sun light and the increase in nutrients brought by rivers lead to larger autotrophic production and sequestration of organic carbon. To determine and monitor the balance of these processes, we will conduct an extensive study in the Mackenzie River / Beaufort Sea system in July and August 2008 onboard the Canadian research ice-breaker CCGS Amundsen. The spatial distribution of organic carbon stocks (living and detrital) in the water column and sediments will be determined on the shelf and beyond. The magnitude and variability of organic carbon mineralization through photo-oxidation and bacterial activity, and production through photosynthesis will be determined. These targeted studies will allow the monitoring of these processes using remote sensing in the coming years and decades. A detailed study of microbial biodiversity will be conducted to describe the different typical communities and eventually anticipate their response to climate change. Diagnostic models of the studied processes (primary production, bacterial activity and light-driven mineralization of organic matter) will be combined with Global Climate Model outputs to assess the fate of the associated carbon fluxes during the next decades under different climate change scenarios.
Purpose:
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Supplemental_Information:
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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: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC MATTER
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > FROZEN GROUND > PERMAFROST
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS
Theme_Keyword: IMBER > INTEGRATED MARINE BIOGEOCHEMISTRY AND ECOSYSTEM RESEARCH
Theme_Keyword: OCEANS
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > ARCTIC OCEAN > BEAUFORT SEA
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: MARCEL BABIN
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: CNRS et Université Pierre et Marie Curie Laboratoire d’Océanographie de Villefrance, BP 8
City: Villefranche s/ mer Cedex
Postal_Code: 06238
Country: France
Contact_Voice_Telephone: +33 (0)4 93 76 37 12
Contact_Facsimile_Telephone: +33 (0)4 93 76 37 39
Contact_Electronic_Mail_Address: marcel@obs-vlf.fr
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
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Logical_Consistency_Report:
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Completeness_Report:
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Lineage:
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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: IMBER/SOLAS > Surface Ocean - Lower Atmosphere Study, International Marine Biogeochemistry and Ecosystem Research
Contact_Person: MARIE-PAULE TORRE
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: BASE DE DONNEES F-Jgofs / PROOF OOV- Obs.Océano. , BP 8
City: VILLEFRANCHE S/MER cedex
Postal_Code: 06238
Country: France
Contact_Voice_Telephone: +33 (0)4-93-76-38-77
Contact_Facsimile_Telephone: +33 (0)4-93-76-37-39
Resource_Description: MALINA
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.imber.info/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.obs-vlfr.fr/Malina
Access_Instructions:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20110512
Metadata_Review_Date: 20111219
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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