TIMOTHY D. MEEHAN J. TOMASZ GIERMAKOWSKI PAUL M. CRYAN 2004 remote-sensing image Isotopes in Environmental and Health Studies \\BUFO\N\JTG\LaCie_Data\projects\DeltaD_Meehan_etal\output\gro_seas_ddp.img gro_seas_ddp.img Stable hydrogen isotope ratios of precipitation (dDp) show distinct geographic patterns across North America. Over the last decade, ecologists have utilized growing-season dDp patterns to study the movements of migratory animals. The accuracy and precision of such studies is, in part, contingent upon the accuracy and precision of growing-season dDp maps. Previous mapping efforts have employed simple kriging procedures to produce smooth contour maps of growing-season dDp. We attempted to improve these maps by incorporating the effects of altitude on both dDp values and growing season length. This involved producing elevation-corrected monthly dDp, temperature, and precipitation amount values for 1 km grid cells across the continental United States and Canada using recently developed interpolation procedures. We used a geographic information system (GIS) to calculate a weighted-average growing-season dDp value for each grid cell using dDp and precipitation amount values for all months in which the mean temperature was greater than 0° C. We used seven independent data sets to compare the precision of the resulting altitude-corrected map to another that did not account for altitude. Overall, predicted dDp values from the altitude-corrected map more closely matched observed values and correspondence was more pronounced at finer spatial scales. Digital versions of the GIS-based maps generated during this effort are available via the Internet at http://biology.unm.edu/wolf/precipitationD.htm. These dDp layers can be combined with other types of spatial information, such as species? geographic ranges and habitat associations, to further improve our understanding of animal movements. This grid provides estimates of delta D ratios of growing- season precipitation for most of North America. It was designed for use by ecologists who estimate continent-scale animal movements based on the hydrogen isotope ratios of their tissues. en 2004 publication date Complete None planned -167.391747 -52.616747 74.730901 24.322568 -167.391747-52.61674724.32256874.730901 precipitation isotope deuterium hydrogen REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords. none cite as appropriate Tim Meehan University of New Mexico 001-505-277-9173 tdmeehan@unm.edu Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800 Raster Dataset Dataset copied. Dataset moved. C:\TEMP\annual_ddp.img Metadata imported.C:\Documents and Settings\tom\Desktop\metadata.xml2004031116473400 Raster Pixel 6049 13773 1 0.0083330.00833332Upper LeftFALSENone1pixel RGBTRUEERDAS IMAGINE Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 GCS_WGS_1984 Downloadable Data ERDAS 0.000 0.000 20040311 Tim Meehan University of New Mexico mailing address

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Albuquerque New Mexico 87131 USA 001-505-277-9173 tdmeehan@unm.edu FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile {FC89366E-7EF4-4828-B724-F6B63F5BAD83}2004031116473400FALSE20040311164734002004031116474500Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800gro_seas_ddp.img-167.391747-52.61674774.73090124.3225681-167.391747-52.61674774.73090124.3225681ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\BUFO\N\JTG\LaCie_Data\projects\DeltaD_Meehan_etal\output\gro_seas_ddp.imgLocal Area Network0.000Raster DatasetGCS_WGS_19842137730.00833360490.008333120040311