1472-6785-7-9-5.jpg (25.18 kB)
Spectral measures and mixed models as valuable tools for investigating controls on land surface phenology in high arctic Greenland-3
figure
posted on 2011-12-31, 10:58 authored by Mikkel P Tamstorf, Lotte Illeris, Birger U Hansen, Mary WiszCopyright information:
Taken from "Spectral measures and mixed models as valuable tools for investigating controls on land surface phenology in high arctic Greenland"
http://www.biomedcentral.com/1472-6785/7/9
BMC Ecology 2007;7():9-9.
Published online 19 Sep 2007
PMCID:PMC2164935.
the GAMM model to calculate the additive contribution of each variable using non parametric smoothing methods. Thus, the y-axis can be interpretted as a transformation of DOYmax. Low values on the y-axis correlate with low DOYmax (early maximum), while high values correlate with higher DOYmax (later maximum). Dashed lines indicate twice standard errors. Each short bar on the x-axis indicates an observation. A: End of snow melt, B: summed air temperature during the green-up period, C: summed rain during the green-up period, D: summed air temperature during the previous growing season. Estimated degrees of freedom are shown by each Y-axis.