Table 1 Variable description of the files contained in this data record.

From: Long-term daily hydrometeorological drought indices, soil moisture, and evapotranspiration for ICOS sites

Variable

Description

Source

unit

file 1: [site_name]_input

Date

Gregorian calendar date

–

YYYY-MM-DD

Doy

Day of year

–

–

lon

Longtitude

ICOS

degree (°)

lat

Latitude

ICOS

degree (°)

PREC

Precipitation

E-OBS

mm

TG

Average temperature

E-OBS

°C

TN

Minimum temperature

E-OBS

°C

TX

Maximum temperature

E-OBS

°C

PET

Potential Evapotranspiration

Eq. 6

mm

RG

Global radiation

Eq. 7

Wm−2

AET

Actual Evapotranspiration

mHM

mm

SM_top

Soil moisture (top soil, 30 cm)

mHM

dimensionless (0–1)

SM_full

Soil moisture (full soil, 200 cm)

mHM

dimensionless (0–1)

file 2: SSMI_[site_name]

Date

Gregorian calendar date

–

YYYY-MM-DD

SSMI_top

Standardized Soil Moisture Index (top soil, 30 cm)

Eqs. 1,3

standard deviation of N[0, 1]

SSMI_full

Standardized Soil Moisture Index (full soil, 200 cm)

Eqs. 1,3

standard deviation of N[0, 1]

file 3: SPI_[site_name]

Date

Gregorian calendar date

–

YYYY-MM-DD

SPI_x

Standardized Precipitation Index

Eqs. 5,3

standard deviation of N[0, 1]

 

with x = aggregation time (5,10,15...720 days)

  

file 4: SPEI_[site_name]

Date

Gregorian calendar date

–

YYYY-MM-DD

SPEI_x

Standardized Precipitation Evapotranspiration Index

Eqs. 1,3

standard deviation of N[0,1]

 

with x = aggregation time (5,10,15...720 days)

  
  1. Each variable is available with a daily temporal resolution from 1950 to 2021.