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BLM REA SNK 2010 - Avg_2060s_08 Standard Deviation comparison between Historical CRU and Projected GCM temperature - FGDC BLM REA


Identification Information:
Citation:
Citation Information:
Originator: Scenarios Network for Alaska and Arctic Planning (SNAP)
Publication Date: 20120803
Title: BLM REA SNK 2010 - Avg_2060s_08 Standard Deviation comparison between Historical CRU and Projected GCM temperature - FGDC BLM REA
Publication Information:
Publication Place: Fairbanks, Alaska, USA
Publisher: Scenarios Network for Alaska and Arctic Planning (SNAP)
Online Linkage: https://landscape.blm.gov/SNK_2010_layerpackages/SNK_CL_TM_tas_annProp_5modelAvg_2060s_08.lpk
Description:
Abstract: Some of the SNK rasters intentionally do not align or have the same extent. These rasters were not snapped to a common raster per the authors' discretion. Please review selected rasters prior to use. These varying alignments are a result of the use of differing source data sets and all products derived from them. We recommend that users snap or align rasters as best suits their own projects. - The first set of files represents projections of the number of historical (1901-1981) standard deviations (SD) above the historical mean for each of three future decades' (2020-2029, 2050-2059, 2060-2069) temperature and precipitation levels. The second set of files represents projections of the proportion of years in a future decade when monthly temperature or precipitation levels are at least two historical SDs above the historical mean. Temperature and precipitation are monthly means and totals, respectively. The spatial extent is clipped to a Seward REA boundary bounding box. In the first set of files, each file, referred to as SDclasses, consists of ordered categorical (factor) data, with three unique classes (factor levels), coded "0", "1" and "2". Within each file, raster grid cells categorized as "0" represent those where the future decadal mean temperature or precipitation value does not exceed one historical SD above the historical mean. Cells categorized as "1" represent those where future decadal values exceed the historical mean by at least one but less than two historical SDs. Cells categorized as "2" represent those where future decadal values exceed the historical mean by at least two historical SDs. In the second set of files, each file, referred to as annProp, consists of numerical data. Within each file, raster grid cell values are proportions, ranging from zero to one, representing the proportion of years in a future decade when monthly mean temperature or monthly total precipitation are at least two historical SD above the historical mean. Proportions are calculated on five GCMs and then averaged rather than calculated on the five-model composite directly. Overview: The historical monthly mean is calculated for each month as the 1901-1981 interannual mean, i.e., the mean of 82 annual monthly values. The historical SD is calculated for each month as the 1901-1981 interannual SD, i.e., the SD of 82 annual monthly values. 2x2 km spatial resolution downscaled CRU 3.1 data is used as the historical baseline. A five-model composite (average) of the Alaska top five AR4 2x2 km spatial resolution downscaled global circulation models (GCMs), using the A2 emissions scenario, is used for the future decadal datasets. This 5 Model Average is referred to by the acronym 5modelavg. For a description of the model selection process, please see Walsh et al. 2008. Global Climate Model Performance over Alaska and Greenland. Journal of Climate. v. 21 pp. 6156-6174. Emmission scenarios in brief: The Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) created a range of scenarios to explore alternative development pathways, covering a wide range of demographic, economic and technological driving forces and resulting greenhouse gas emissions. The B1 scenario describes a convergent world, a global population that peaks in mid-century, with rapid changes in economic structures toward a service and information economy. The Scenario A1B assumes a world of very rapid economic growth, a global population that peaks in mid-century, rapid introduction of new and more efficient technologies, and a balance between fossil fuels and other energy sources. The A2 scenario describes a very heterogeneous world with high population growth, slow economic development and slow technological change. These files are bias corrected and downscaled via the delta method using PRISM (http://prism.oregonstate.edu/) 1961-1990 2km data as baseline climate. Absolute anomalies are utilized for temperature variables. Proportional anomalies are utilized for precipitation variables. Please see http://www.snap.uaf.edu/methods.php for a description of the downscaling process. File naming scheme: [variable]_[metric]_[groupModel]_[timeFrame].[fileFormat] [variable] pr, tas [metric] SDclasses, annProp [groupModel] 5modelAvg [timeFrame] decade_month [fileFormat] tif examples: pr_SDclasses_5modelAvg_2020s_01.tif This file represents a spatially explicit map of the number of January total precipitation historical SDs above the January total precipitation historical mean level, for projected 2020-2029 decadal mean January total precipitation, where cell values are binned in classes "less than one", "at least one, less than two", and "greater than two", labeled as "0", "1", and "2", respectively. tas_annProp_5modelAVg_2060s_06.tif This file represents a spatially explicit map of the proportion of years in the period 2060-2069 when June mean temperature projections are at least two historical SDs above the June mean temperature historical mean level, where cell values are proportions ranging from zero to one. tas = near-surface air temperature pr = precipitation including both liquid and solid phases
Purpose: analyze trends of future climate scenarios
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 2001
Beginning Time: 000000
Ending Date: 2060
Currentness Reference: updated as needed
Status:
Progress: Complete
Maintenance and Update Frequency: As needed
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -169.029343
East Bounding Coordinate: -155.538432
North Bounding Coordinate: 67.808659
South Bounding Coordinate: 61.131144
Keywords:
Theme:
Theme Keyword Thesaurus: ISO 19115 Topic Category
Theme Keyword: climatologyMeteorologyAtmosphere
Theme:
Theme Keyword Thesaurus: BLM-Theme
Theme Keyword: Disturbance
Theme Keyword: Geospatial
Theme:
Theme Keyword Thesaurus: BLM-REA
Theme Keyword: SNK 2010
Theme Keyword: Seward Peninsula
Place:
Place Keyword Thesaurus: BLM-State
Place Keyword: Alaska
Theme:
Theme Keyword Thesaurus: None
Theme Keyword: DOI
Theme Keyword: Bureau of Land Management
Theme Keyword: BLM
Theme Keyword: Rapid Ecoregional Assessment
Theme Keyword: REA
Theme:
Theme Keyword Thesaurus: BLM Thesaurus
Theme Keyword: Climate
Theme:
Theme Keyword Thesaurus: ISO 19115 Topic Category
Theme Keyword: climatologyMeteorologyAtmosphere
Place:
Place Keyword Thesaurus: BLM-State
Place Keyword: Alaska
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Scenarios Network for Alaska and Arctic Planning (SNAP)
Contact Person: Data Manager
Contact Position: Operations Lead
Contact Address:
Address Type: mailing and physical address
Address: 3352 College Rd
City: Fairbanks
State or Province: Alaska
Postal Code: 99709
Country: USA
Contact Voice Telephone: 9074745539
Contact Electronic Mail Address: takurkowski@alaska.edu
Security Information:
Security Classification: None
Security Handling Description: None
Security Classification System: None
Access Constraints: None, these data are considered public domain
Use Constraints: These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived, and both scale and accuracy may vary across the data set. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office for which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This information may be updated without notification.
Data Quality Information:
Attribute Value Accuracy Information:
Attribute Accuracy Report: high
Quantitative Attribute Accuracy Assessment:
Attribute Accuracy Value: high
Attribute Accuracy Explanation: high for 2km spatial resolution data
Logical Consistency Report: very consistent data
Completeness Report: raster data at 2km spatial resolution
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report: high
Quantitative Horizontal Positional Accuracy Assessment:
Horizontal Positional Accuracy Value: 2000
Horizontal Positional Accuracy Explanation: high for 2km spatial resolution data
Vertical Positional Accuracy:
Vertical Positional Accuracy Report: na
Quantitative Vertical Positional Accuracy Assessment:
Vertical Positional Accuracy Value: 0
Vertical Positional Accuracy Explanation: na
Lineage:
Process Step:
Process Description: clipped to Seward REA boundary bounding box
Process Date: 20111207
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Tom Kurkowski
Contact Organization: Scenarios Network for Alaska and Arctic Planning (SNAP)
Contact Position: Operations Lead
Contact Address:
Address Type: mailing and physical address
Address: 3352 College Rd
City: Fairbanks
State or Province: Alaska
Postal Code: 99709
Country: USA
Contact Voice Telephone: 9074745539
Contact Electronic Mail Address: takurkowski@alaska.edu
Source Information:
Source Time Period of Content:
Time Period Information:
Single Date/Time:
Calendar Date: unknown
Source Currentness Reference: Unknown
Source Citation Abbreviation: Unknown
Source Citation:
Citation Information:
Originator: Unknown
Publication Date: Unknown
Title: Unknown
Source Scale Denominator: Unknown
Type of Source Media: Unknown
Source Contribution: Unknown
Spatial Data Organization Information:
Direct Spatial Reference Method: Raster
Raster Object Information:
Raster Object Type: Grid Cell
Row Count: 343
Column Count: 285
Spatial Reference Information:
Horizontal Coordinate System Definition:
Geodetic Model:
Semi-major Axis: 6378137.0
Denominator of Flattening Ratio: 298.257222101
Ellipsoid Name: GRS 1980
Horizontal Datum Name: D North American 1983
Planar:
Planar Coordinate Information:
Planar Distance Units: meters
Planar Coordinate Encoding Method: coordinate pair
Coordinate Representation:
Ordinate Resolution: 0.0001
Abscissa Resolution: 0.0001
Map Projection:
Albers Conical Equal Area:
Longitude of Central Meridian: -154.0
Latitude of Projection Origin: 50.0
Standard Parallel: 55.0
Standard Parallel: 65.0
False Northing: 0.0
False Easting: 0.0
Map Projection Name: Albers Conical Equal Area
Entity and Attribute Information:
Overview Description:
Entity and Attribute Overview: Standard deviations and proportions of standard deviations
Entity and Attribute Detail Citation: common scientific precipitation units
Detailed Description:
Entity Type:
Entity Type Label: Unknown
Entity Type Definition: Unknown
Attribute:
Attribute Definition: Unknown
Attribute Label: Unknown
Distribution Information:
Standard Order Process:
Digital Form:
Digital Transfer Option:
Online Option:
Access Instructions: Download from Landscape Approach Data Portal
Computer Contact Information:
Network Address:
Network Resource Name: https://landscape.blm.gov/SNK_2010_layerpackages/SNK_CL_TM_tas_annProp_5modelAvg_2060s_08.lpk
Digital Transfer Information:
Format Specification: Varies
File Decompression Technique: No compression applied
Format Name: ESRI Layer Package (LPK)
Fees: N/A
Ordering Instructions: Download from Landscape Approach Data Portal
Distribution Liability: The BLM assumes no responsibility for errors or omissions. No warranty is made by the BLM as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data; nor shall the act of distribution to contractors, partners, or beyond, constitute any such warranty for individual or aggregate data use with other data. Although these data have been processed successfully on computers of BLM, no warranty, expressed or implied, is made by BLM regarding the use of these data on any other system, or for general or scientific purposes, nor does the fact of distribution constitute or imply any such warranty. In no event shall the BLM have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the use or reliance on the geographic data or arising out of the delivery, installation, operation, or support by BLM.
Technical Prerequisites: ESRI ArcGIS software, version 10.0 or greater
Resource Description: Downloadable Data
Available Time Period:
Time Period Information:
Single Date/Time:
Calendar Date: 2014
Distributor:
Contact Information:
Contact Address:
Postal Code: 80225-0047
Address: Building 50, Denver Federal Center
Address: P.O. Box 25047
City: Denver
Address Type: mailing and physical address
State or Province: Colorado
Country: USA
Contact Electronic Mail Address: blm_oc_rea_data_portal_feedback_team@blm.gov
Contact Voice Telephone: Please email
Contact Position: Resource Programs Data Coordinator, OC-530
Contact Organization Primary:
Contact Organization: Bureau of Land Management
Metadata Reference Information:
Metadata Date: 20161228
Metadata Contact:
Contact Information:
Contact Person Primary:
Contact Person: Tom Kurkowski
Contact Organization: Unknown
Contact Address:
Address Type: mailing and physical address
Address: 3352 College Rd
City: Fairbanks
State or Province: Alaska
Postal Code: 997709
Country: Unknown
Contact Voice Telephone: 9074745539
Contact Electronic Mail Address: takurkowski@alaska.edu
Contact Position: Unknown
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Review Date: 20120803
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