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Table 2 Correlation coefficient (R) between the daily average of log10(soil CO2 flux) and environmental parameters, 95% confidence interval of R (R95), and t test and p values for R

From: Continuous monitoring of soil CO2 flux at Aso volcano, Japan: the influence of environmental parameters on diffuse degassing

Parameter Degree of freedom R R 95 t test p value
Barometric pressure 11,554 − 0.145 − 0.162 to − 0.127 − 15.71 0.00
Air temperature 11,554 − 0.244 − 0.261 to − 0.226 − 27.00 0.00
Air relative humidity 9847 − 0.039 − 0.059 to − 0.019 − 3.85 0.00
Precipitation 10,532 − 0.077 − 0.096 to − 0.058 − 7.91 0.00
Soil temperature 11,554 − 0.125 − 0.143 to − 0.107 − 13.51 0.00
Soil humidity 11,554 − 0.124 − 0.142 to − 0.106 − 13.48 0.00
Wind speed 11,554 0.414 0.399 to 0.429 48.86 0.00
  1. The air temperature data used in this statistical treatment include the interpolated values