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Table 2 Final model results

From: Spectral measures and mixed models as valuable tools for investigating controls on land surface phenology in high arctic Greenland

SINDVI

All

Fell field

Dryas

Cassiope

Salix heath

Grassland

Fen

Time of snow-melt

(-)

 

∩

(-)

∩

(+)

+

Temperature (during growing season)

∩

+

(-)

∩

∩

∩

 

Light (during growing season)

(-)

+

 

(-)

U

 

(+)

Rain (during growing season)

(-)

+

 

(-)

(-)

(-)

+

SINDVI, prev. year

+

+

(+)

(+)

(+)

 

(+)

Temperature, prev. year

(-)

-

-

-

-

-

-

Variance explained by model (adj. R2)

0.78

0.84

0.21

0.55

0.79

0.53

0.82

DOYMAX

All

Fell field

Dryas

Cassiope

Salix heath

Grassland

Fen

Time of snow-melt

(+)

(+)

(+)

(+)

(+)

U

+

Temperature (during green-up)

(+)

 

(+)

(+)

(+)

U

U

Light (during green-up*)

 

+

 

(+)

(+)

  

Rain (during green-up*)

∩

∩

U

(+)

(+)

∩

∩

SINDVI, prev. year

   

-

 

(+)

U

Temperature, prev. year

∩

(+)

-

∩

∩

∩

U

Variance explained by model (adj. R2)

0.89

0.98

0.85

0.97

0.98

0.89

0.98

  1. Variables included in the final models and their relation to the modeled response variables: seasonal integrated NDVI-FR (SINDVI) and the timing of maximum NDVI-FR (DOYMAX). '+' indicates that the variable has a linear positive correlation with the response variable while '-' indicates a negative linear relation. Brackets indicate a non-linear correlation but with an overall positive or negative trend. '∩' indicate a non-linear response with a maximum, and 'U' indicate a non-linear response with a minimum. Blank indicates that the variable didn't improve the model and was therefore not included * Green-up is defined from the start of the growing season to the day of maximum.