Identification_Information: Citation: Citation_Information: Originator: Christopher G. Smith Originator: Marci E. Marot Originator: Alisha M. Ellis Originator: Cathryn J. Wheaton Originator: Julie C. Bernier Originator: C. Scott Adams Publication_Date: 20150501 Title: Assateague Island sediment core radiochemistry data from March-April 2014, USGS Field Activity Number 2014-301-FA Geospatial_Data_Presentation_Form: tabular digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2015-1169 Online_Linkage: http://pubs.er.usgs.gov/publication/ofr20151169/data/14CTB_Alpha_Spec_Data.zip Larger_Work_Citation: Citation_Information: Originator: Christopher G. Smith Originator: Marci E. Marot Originator: Alisha M. Ellis Originator: Cathryn J. Wheaton Originator: Julie C. Bernier Originator: C. Scott Adams Publication_Date: 20150501 Title: Sedimentological and radiochemical characteristics of marsh deposits from Assateague Island and adjacent vicinity, Maryland and Virginia, following Hurricane Sandy Edition: 1.0 Geospatial_Data_Presentation_Form: multimedia presentation Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2015-1169 Publication_Information: Publication_Place: St. Petersburg, Florida Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Online_Linkage: http://dx.doi.org/10.3133/ofr20151169 Description: Abstract: The influence of tropical and extratropical cyclones on coastal wetlands and marshes is highly variable in both space and time and depends on a number of climatic, geologic, and physical variables. The impacts storms can be either positive or negative with respect to the wetland and marsh ecosystems. Small to moderate amounts of inorganic sediment added during storms or other events helps to abate pressure from sea-level rise. However, if the volume of sediment is large and the resulting deposits thick, the organic substrate may compact causing submergence and a loss in elevation. Similarly, thick deposits of coarse inorganic sediment may also alter the hydrology of the site and impede vegetative processes. Alternative impacts associated with storms include shoreline erosion at the marsh edge as well as potential emergence. Predicting the outcome of these various responses and potential long-term implications can be obtained from a systematic assessment of both historical and recent event deposits. The objectives of this study are to 1) characterize the surficial sediment of the relict to recent washover fans and back-barrier marshes, and 2) characterize the sediment of 6 marsh cores from the back-barrier marshes and a single marsh island core near the mainland. These geologic data will be integrated with other remote sensing data collected along Assateague Island, Maryland / Virginia and assimilated into an assessment of coastal wetland response to storms. Purpose: The 14CTB_Alpha_Spec_Data.zip file includes all alpha spectroscopy radiochemistry analysis results from the 8 marsh push cores and 1 auger core collected on Assateague Island and the mainland of Maryland and Virginia in March/April and October 2014 by the U.S. Geological Survey (USGS), St. Petersburg Coastal and Marine Science Center. Supplemental_Information: This publication contains data for the field activities conducted in 2014: March 26 – April 4, 2014. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20140326 Ending_Date: 20140404 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.46667 East_Bounding_Coordinate: -75.11111 North_Bounding_Coordinate: 38.26667 South_Bounding_Coordinate: 37.82222 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: wetland Theme_Keyword: sediment Theme_Keyword: core Theme_Keyword: radiochemistry Theme_Keyword: alpha spectroscopy Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Maryland Place_Keyword: Virginia Place_Keyword: Assateague Island Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: sediment Stratum_Keyword: subsurface Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: March 2014 Temporal_Keyword: April 2014 Access_Constraints: none Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Contact_Person: Christopher G. Smith Contact_Position: Research Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: US Contact_Voice_Telephone: (727) 502-8035 Contact_Electronic_Mail_Address: cgsmith@usgs.gov Data_Set_Credit: U.S. Geological Survey Native_Data_Set_Environment: Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; Microsoft Excel Version 2010 Use_Constraints: The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The radioisotopic activities reported in the Excel spreadsheets include the counting error for all samples. Logical_Consistency_Report: The data include core ID, sample depth interval in core (cm), total Pb-210 activity, and total Pb-210 counting error. Completeness_Report: This is a complete processed radiochemistry data file for USGS FAN 2014-301-FA (14CTB). Lineage: Process_Step: Process_Description: At the USGS SPCMSC, the cores were extruded in 1-centimeter intervals and placed in labeled bags. The samples were refrigerated until further analysis. Process_Date: 20150501 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Person: Christopher G. Smith Contact_Position: Research Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: U.S. Contact_Voice_Telephone: (727) 502-8035 Contact_Electronic_Mail_Address: cgsmith@usgs.gov Process_Step: Process_Description: Each subsample (approximately 20-30 mL of wet sediment) was oven-dried at 60°C for 48 hours. The dried sediment was homogenized to a fine powder using a porcelain mortar and pestle. Total Pb-210 (via granddaughter polonium-210; [Po-210]) were determined by alpha spectroscopy following the procedure of Marot and Smith (2012). Briefly, approximately 1 – 5 g of sediment was spiked with a 0.5 mL of Po-209 of known activity (12 decays per minute per milliliter [dpm mL-1]). Sediments were leached with a combination of concentrated nitric and hydrochloric acid with the addition of 30 % H2O2 to remove organics. Sediments were taken to near dryness and re-saturated three times with hydrochloric acid until all nitric acid is removed. Po-209 and Po-210 were electroplated onto silver planchets and counted on an alpha spectrometer. Count rate efficiency for Po-209 were determined and applied to Po-210 counts. Total Pb-210 is then assumed to be in secular equilibrium with Po-210 in the down-core sediment. Process_Date: 2014 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Person: Christopher G. Smith Contact_Position: Research Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: U.S. Contact_Voice_Telephone: (727) 502-8035 Contact_Electronic_Mail_Address: cgsmith@usgs.gov Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 14CTB Alpha Spec Data.xlsx Entity_Type_Definition: Alpha spectroscopy radiochemistry results of sediment cores collected on Assateague Island, Maryland. Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: Core ID Attribute_Definition: Marsh sediment core site number Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Core site identification number assigned by USGS scientist Attribute: Attribute_Label: Depth (cm) Attribute_Definition: Sample interval depth measured from top of the core (cm) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0-1 Range_Domain_Maximum: 56-57 Attribute: Attribute_Label: Pb-210 Activity (dpm/g) Attribute_Definition: Total Pb-210 specific activity measured in disintegrations per minute per gram of dry sediment at the date of field collection. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.033 Range_Domain_Maximum: 22.94 Attribute: Attribute_Label: Pb-210 Activity Error (+/- dpm/g) Attribute_Definition: Total Pb-2107 specific activity counting error measured in disintegrations per minute per gram of dry sediment at the date of field collection. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.004 Range_Domain_Maximum: 0.555 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Person: Christopher G. Smith Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: U.S. Contact_Voice_Telephone: 502-8035 Contact_Electronic_Mail_Address: cgsmith@usgs.gov Distribution_Liability: This publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Standard_Order_Process: Fees: none Digital_Form: Digital_Transfer_Information: Format_Name: Zip archive Format_Version_Number: 1 Format_Specification: .zip Transfer_Size: 0.038 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.er.usgs.gov/publication/ofr20151169/data/14CTB_Alpha_Spec_Data.zip Resource_Description: Downloadable data Custom_Order_Process: none Technical_Prerequisites: These spreadsheets included in this .zip file were created for use with Microsoft Excel 2010. It may also be viewed with the Microsoft Excel viewer or by downloading a Microsoft Compatibility Pack to view with older versions of Microsoft Excel. The .zip file also contains comma delimited files (.csv) of the radiochemsitry data for each core. The .csv data files contains the tabular data in plain text and may be viewed with a standard text editor. Metadata_Reference_Information: Metadata_Date: 20150501 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Person: Christopher G. Smith Contact_Position: Research Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: U.S. Contact_Voice_Telephone: (727) 502-8035 Contact_Electronic_Mail_Address: cgsmith@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None Metadata_Use_Constraints: The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.