uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/65b652ec78786936f8f9d0961cbb107c Matt Fitzpatrick Aaron Ellison https://orcid.org/0000-0003-4151-6081 Evan Preisser https://orcid.org/0000-0002-8737-5619 Joseph Elkinton Researcher Adam Porter Researcher 2023 English

We developed annual raster maps depicting spatiotemporal variation in mean winter temperature for the purposes of modeling the spread of the hemlock woolly adelgid. The maps are based on the PRISM and WorldClim datasets as described in methods.

air temperature climate hemlock hemlock woolly adelgid region LTER controlled vocabulary disturbance populations LTER core area Harvard Forest HFR LTER USA HFR default

This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf192 Eastern North America. Coordinates based on WGS84 datum. -93.7 -59.7 +48.3 +33.6 0 2037 meter 1951 2009 genus Adelges species tsugae hemlock woolly adelgid complete Information Manager Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 hf-im@lists.fas.harvard.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu

The following description of methods is quoted from: FFitzpatrick, M. C., Preisser, E. L., Porter, A., Elkinton, J. S., Ellison, A. M. 2012. Modeling range dynamics in heterogeneous landscapes: invasion of the hemlock woolly adelgid in eastern North America. Ecological Applications 22: 472-486. We constructed annual maps of observed mean winter (December-March) temperature for each year between 1951 (December) and 2008 (up to March of 2009) from the PRISM climate group. PRISM data only are available for the lower 48 United States and not portions of Canada within the study region. Global, spatially explicit estimates of temperature exist at 1km resolution, but these characterize climate averaged over the years 1950-2000 (WorldClim database) rather than annual means. To create annual estimates of mean winter temperature for areas in Canada not covered by the PRISM data, we used the following procedure. First, we used PRISM data and spatially coincident WorldClim data in year t to calculate the winter temperature anomaly between temperatures observed in year t and mean temperatures observed during the period 1950-2000. This produced a map of the difference between winter temperatures in year t and the long-term average for winter temperature. Next, we averaged all cells in the map to calculate the mean winter temperature anomaly for year t. Finally, we subtracted this mean temperature anomaly from the average winter temperature from WorldClim and within the portion of the study area in Canada for which we did not have an annual record of winter temperature. The result was a mean winter temperature map for each year, with annual winter temperatures in Canada that varied from average temperatures to the same magnitude as observed in the PRISM data covering the United States.

Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu https://ror.org/059cpzx98 pointOfContact The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts. National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210. hf192-01-temp-maps.zip annual raster maps of mean winter (December-March) temperature for years 1951-2009 hf192-01-temp-maps.zip 38548207 86de42edf1b17205c090045666192c14 zip Erdas imagine https://harvardforest.fas.harvard.edu/data/p19/hf192/hf192-01-temp-maps.zip raster GIS informatics invasive regional modeling https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf190 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf191