Nuup Kangerlua

Collected July-August 2011-2013 (PI: Jacob Nabe-Nielsen)

These data collected July-August 2011-2013 (PI: Jacob Nabe-Nielsen). Please contact J. Nabe-Nielsen (jnn_at_ecos.au.dk) to request access to data on all surveyed shrub species. Available here are only data used in Chardon et al. 2022.

COLUMN ABBREVIATIONS

Metadata for 90 m spatial grid

year: sampling year

alt: average altitude of grid as recorded during field surveys m

long: WGS84 longitude

lat: WGS84 latitude

x_stere: longitude in Polar Stereographic (EPSG 4326)

y_stere: latitude in Polar Stereographic (EPSG 4326)

Species presence 1 or absence 0 at grid level

pa_bena: Betula nana

pa_sagl: Salix glauca

Shrub species cover (calculated from pin hits in 0.7 x 0.7 m frame, based on total of 25 hits) %

cov_bena: Betula nana cover

cov_sagl: Salix glauca cover

Downscaled climate (time series 1984 – 2013)

tempjja: average maximum June-August temperature ºC

tempmax: yearly maximum temperature ºC

tempmin: yearly minimum temperature ºC

tempcont: yearly maximum – minimum temperature ºC

precipmam: cumulative March-May precipitation mm

precipjja: cumulative June-August precipitation mm

insoljja: average June-August insolation MJ cm-2 yr-1

Topography and terrain wetness (calculated from)

twi: SAGA wetness index (MEaSUREs Greenland Ice Mapping Project Digital Elevation Model v. 1; Howat et al., 2014, 2015)

slope: slope angle (MEaSUREs Greenland Ice Mapping Project Digital Elevation Model v. 1; Howat et al., 2014, 2015) º

asp: aspect (MEaSUREs Greenland Ice Mapping Project Digital Elevation Model v. 1; Howat et al., 2014, 2015) º

tcws: Tasseled Cap Wetness component (Sentinal images)

Community characteristics

rich: shrub species richness averaged across pin-point frames per grid

shan: Shannon diversity (‘vegan’ package; Oksanen et al. 2019)

comp_bena: shrub competition on Betula nana (i.e. summed cover of non-B. nana species) % cover

comp_sagl: shrub competition on Salix glauca (i.e. summed cover of non-S. glauca species) % cover