Regional-scale combined land-atmosphere water balance based on daily observations in Illinois

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In this chapter, the regional land water balance (LWB), atmosphere water balance (AWB), and combined (land-atmosphere) water balance (CWB) are investigated over the state of Illinois based on a unique and comprehensive 10yr (2004-2013) daily dataset including in situ direct observations of precipitation (P), soil moisture (SM), groundwater (GW) depth, and streamflow (R), as well as the dataset of atmospheric moisture convergence (C) and precipitable water from European Centre for Medium-Range Weather Forecasts Interim Reanalysis (ERA-Interim) reanalyses. The focus of this study is on the coupling between three water balances and the interrelationships among various water balance components at daily, monthly, and interannual timescales. Terrestrial water storage (TWS) anomalies from GRACE satellite data agree well with that inferred from in situ observed SM and GW data (r=0.90). The 2004-2013 monthly TWS change and evaporation (E) estimated purely from in situ observed data are compared with other two estimates, from GRACE data and reanalyses data, respectively. Monthly E estimated from three methods match favorably with the correlation coefficient between 0.61-0.77. A large imbalance due to systematic bias of reanalysis data is found between mean annual C (129mm) and R (348mm), which can be corrected by using observed daily or monthly TWSC along with daily R data.

Original languageEnglish
Title of host publicationTerrestrial Water Cycle and Climate Change
Subtitle of host publicationNatural and Human-Induced Impacts
Number of pages19
ISBN (Electronic)9781118971772
ISBN (Print)9781118971765
Publication statusPublished - 2016
Externally publishedYes


  • Atmosphere water balance
  • Atmospheric moisture convergence
  • Groundwater depth
  • Illinois
  • Precipitation
  • Regional land water balance
  • Soil moisture
  • Streamflow

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