Table 4 Trend slope of annual CUE and its corresponding p-value for the major Climatic classes (Fig. 7). SGPR and SMODIS refer to the trend slopes obtained from CUEGPR and CUE’MODIS, respectively.

From: Ecosystem carbon use efficiency at global scale from upscaling eddy-covariance data with machine learning and MODIS products

CLIMATIC CLASSE

Slope S (yr–1)

p-value

Tropical

\(\:{S}_{\text{GPR}}=(-1.5\pm\:0.1)\times\:{10}^{-3}\)

\(\:{S}_{\text{MODIS}}=(-1.0\pm\:0.1)\times\:{10}^{-3}\)

0.0015

0.0019

Arid

\(\:{S}_{\text{GPR}}=\left(4.6\pm\:2.3\right)\times\:{10}^{-5}\)

\(\:{S}_{\text{MODIS}}=\left(5.3\pm\:1.3\right)\times\:{10}^{-5}\)

0.0049

0.0054

Temperate

\(\:{S}_{\text{GPR}}=\left(-4.4\pm\:0.5\right)\times\:{10}^{-4}\)

\(\:{S}_{\text{MODIS}}=(-8.8\pm\:2.2)\times\:{10}^{-6}\)

0.0028

0.0031

Cold

\(\:{S}_{\text{GPR}}=\left(-1.6\pm\:0.1\right)\times\:{10}^{-3}\)

\(\:{S}_{\text{MODIS}}=(-1.3\pm\:0.1)\times\:{10}^{-3}\)

0.0011

0.0016

Polar

\(\:{S}_{\text{GPR}}=\left(-2.3\pm\:0.2\right)\times\:{10}^{-4}\)

\(\:{S}_{\text{MODIS}}=\left(-1.8\pm\:0.2\right)\times\:{10}^{-4}\)

0.0046

0.0052