SGER - µ-Raman Analysis of Ice-Core Samples

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Citation_Information:
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Publication_Date: Unknown
Title: SGER - µ-Raman Analysis of Ice-Core Samples
Description:
Abstract:
Analysis of material preserved in glaciers and ice-sheets can provide a window into the climatological and environmental history of our planet. Current analytical methodology involves sectioning of core samples followed by destructive analysis, precluding simultaneous analysis of the same ice sample for microbial, and chemical content. Sample sizes required for each of these analyses limit the spatial and, hence, chronological resolution that can be obtained within a core sample. Analytical methods that provide information on a number of parameters on a micro-scale through either field-portable or in situ instrumentation have the potential of providing rapid screening of ice cores for guiding field sampling and development of near real-time information, as well as providing information on micro-environments within the core itself. As a non-destructive analytical tool with high spatial resolution, µ-Raman spectroscopy can provide information at high sensitivity to make its use as a non-destructive survey tool for ice core samples attractive. This is particularly the case with micro-sampling since chemicals, which are at trace levels when bulk analysis is performed, are often segregated (and concentrated) within the core at the microscopic level. Laser-based techniques such as Raman can be used to obtain chemical information at near diffraction-limited resolution allowing particulates on the order of 1 μm to be characterized. This work involved the assembly of μ-Raman equipment capable of excitation using either visible or UV excitation, development of a library of Raman spectra, development of techniques for the quantitative analysis of anionic species, and analysis of surrogate and glacial ice core samples. Proof-of-concept experiments evaluate the potential of micro-Raman analysis to: (1) tephra particles from Mount Waesche and Mount DeWitt were analyzed with spatial resolution <5 μm at room temperature and -15°C, and (2) characterize the micro-environment of liquid veins in glacial core samples from the following locations: GISP 2, Newall Glacier, and Dominion Range at -15°C. For tephra samples, it was found that analysis of vitreous components resulted in identifiers unique to the source of the glass. With respect to ice vein analysis, concentration of nitrate ans sulfate some five orders of magnitude over the bulk concentration were noted. MSA was not found in any of the veins in measurable quantity, leading to the speculation that it is present in the core mainly as a particulate. Based on the sulfate ion concentrations measured in glacial veins, extremely acidic pH values of ~1 can be inferred, providing a measure of one of the factors controlling the ice-vein µ-habitat chemistry. This project is a novel extension of Raman into the area of polar and climatic research, providing data on chemical speciation hitherto unavailable of critical importance to the understanding of the biology present in glacial ice as well as the sources of particulate material found in ice cores. Since the availability of ice-core material at critical horizons is limited, this non-destructive technique helps to maximize the information obtained from these samples. The application of µ-Raman spectroscopy to the analytical problems of trace environmental analysis at this level of spatial resolution is unique, and demonstrates the feasibility an integrated approach to ice core analysis, while addressing specific problems in glaciology.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: R. E. Barletta and C. H. Roe 2011 Differential Raman cross section of dimethyl sulfide Journal of Raman Spectroscopy 42 Wiley 117-121 10.1002/jrs.2749
Supplemental_Information:
REFERENCE: R. E. Barletta 2011 Raman analysis of blue ice tephra: An approach to tephrachronological datind of ice cores Antarctic Science Cambridge University Press accepted for publication
Supplemental_Information:
REFERENCE: R. E. Barletta and C. H. Roe 2011 Chemical analysis of ice vein µ-environments Polar Record Cambridge University Press submitted for publication
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
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Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE
Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS > IONS
Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS > PARTICULATE MATTER
Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS > VOLCANIC DEPOSITS
Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > SNOW/ICE CHEMISTRY
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS
Theme_Keyword: LABORATORY
Theme_Keyword: FIELD INVESTIGATION
Theme_Keyword: SPECTROMETERS/RADIOMETERS
Theme_Keyword: Antarctic
Theme_Keyword: Ice Core
Theme_Keyword: Spectroscopy
Theme_Keyword: Particulates
Theme_Keyword: Raman Spectra
Theme_Keyword: Ions
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
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Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: NSIDC AGDC USER SERVICES
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
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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:
Process_Step:
Process_Description:
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Process_Date: Unknown
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NSIDC > National Snow and Ice Data Center
Contact_Person: NSIDC USER SERVICES
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NSIDC_AGDC > NSIDC Antarctic Glaciological Data Center
Contact_Person: NSIDC AGDC USER SERVICES
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
Resource_Description: barletta_0828786
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://nsidc.org
Access_Instructions:
DATA CENTER URL
Online_Option:
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Network_Address:
Network_Resource_Name:
http://nsidc.org/agdc/
Access_Instructions:
DATA CENTER URL
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Network_Resource_Name:
http://www.nsf.gov/awardsearch/showAward.do?AwardN...
Access_Instructions:
NSF Award #0828786 Abstract
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20110906
Metadata_Review_Date: 20110912
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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