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ANACONDAS: Amazon iNfluence on the Atlantic: CarbOn export from Nitrogen fixation by DiAtom Symbioses

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: ANACONDAS: Amazon iNfluence on the Atlantic: CarbOn export from Nitrogen fixation by DiAtom Symbioses
Description:
Abstract:
The Amazon River plume ecosystem, extending thousands of km from the river mouth, represents a potentially significant but poorly understood, climate-sensitive C sequestration pathway that seems to violate the expectation of an inefficient open-ocean biological pump. The ANACONDAS investigators hypothesize that large tropical river plumes with low N:P ratios provide an ideal niche for diatom-diazotroph assemblages (DDAs). They suggest that the ability of these organisms to fix N2 within the surface ocean is responsible for significant C export in the Amazon River plume. Since primary production fueled by allochthonous sources of N such as N2 fixation can drive a net, biologically mediated transfer of C from the atmosphere to the ocean, C sequestration by DDAs in the Amazon River plume is a regionally significant process. Because DDAs have been found in other tropical river systems, they may represent a globally significant, yet previously overlooked biological pump mechanism. The ANACONDAS project aims to address specifically 1) how C cycling and sequestration in the tropical North Atlantic is influenced by the Amazon River through its impact on pelagic ecosystem dynamics and 2) the sensitivity of this ecosystem to anthropogenic climate change. Our focus is to identify the links between riverine micronutrient ratios, enhanced N2-fixation, phytoplankton community structure and succession, and the sequestration of excess C into the deep ocean via the biological pump. To predict the evolution of this regional C export as climate changes, we must understand these links and their sensitivity to changes in the Amazon itself and other climate impacts on the tropical Atlantic. ANACONDAS was funded as part of the US National Science Foundation (NSF) Emerging Topics in Biogeochemical Cycles (ETBC) program (Directorate for Geosciences, NSF 07-049, September 2007) explicitly intended to support emerging areas of interdisciplinary research. In this study the researchers will undertake a suite of field, satellite and modeling studies aimed at understanding the ecology and tracing the fate of C and N fixed by DDAs and other phytoplankton living in the plume. By examining C and silicate (Si) export from offshore surface waters, through the upper oceanic food web, the mesopelagic, and down to the deep sea floor, they will quantify the impact of the Amazon River on biological processes that control C sequestration and the implications of these regional processes on C, N and Si budgets. The study will go beyond previous research because they will quantify 1) the distribution, nutrient demands, and activity of DDAs in the context of phytoplankton species succession, 2) the sensitivity of the CO2 drawdown to the mix of phytoplankton, 3) the grazing and aggregation processes contributing to the sinking flux, 4) the composition of this flux, and 5) the proportion of this material that reaches the seafloor. This effort truly represents a measure of C sequestration and pump efficiency. Ecological modeling will be used to place observational results from field studies and satellites into the context of the larger Atlantic basin with tropical climate variability on interannual and longer time scales. Following NSF funding of ANACONDAS, the Gordon and Betty Moore Foundation, Marine Microbiology Initiative (GBMF-MMI) funded a multi-disciplinary expansion project to further link the plume study to the hydrology and biogeochemistry of the lower reach of the Amazon River and expand our analysis of microbial communities along the River Ocean Continuum of the Amazon (ROCA). The combined project aims to improve predictive capabilities for climate change impacts on the marine biosphere with resulting climate feedbacks via the carbon cycle.
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20090901
Ending_Date: 20120831
Currentness_Reference:Unknown
Status:
Progress: In Work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -60.0
East_Bounding_Coordinate: -45.0
North_Bounding_Coordinate: 15.0
South_Bounding_Coordinate: 0.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > NITROGEN COMPOUNDS > NITROGEN DIOXIDE
Theme_Keyword: IMBER > INTEGRATED MARINE BIOGEOCHEMISTRY AND ECOSYSTEM RESEARCH
Theme_Keyword: ESIP > EARTH SCIENCE INFORMATION PARTNERS PROGRAM
Theme_Keyword: Anacondas
Theme_Keyword: NULL
Theme_Keyword: ENGLISH
Access_Constraints: All data reported from the US NSF funded ANACONDAS project will be made publicly available within two years of acquisition.
Use_Constraints:
All data reported from the US NSF funded ANACONDAS project will be made publicly available within two years of acquisition.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: PATRICIA L. YAGER
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: University of Georgia
Address: School of Marine Programs
City: Athens
State_or_Province: Georgia
Postal_Code: 30602-3636
Country: USA
Contact_Voice_Telephone: 706-542-6824
Contact_Facsimile_Telephone: 706-542-5888
Contact_Electronic_Mail_Address: pyager@uga.edu
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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: BCO-DMO > Biological and Chemical Oceanography Data Management Office
Contact_Person: CINDY CHANDLER
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: WHOI
City: Woods Hole
Country: USA
Resource_Description: http://osprey.bcodmo.org/project.cfm?flag=view&id=101&sortby=project
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.bco-dmo.org
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.imber.info/index.php/Science/Endorsed-P...
Access_Instructions:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20101116
Metadata_Review_Date: 20170823
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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