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Modeling the Land-Atmosphere Hydrologic Cycle and its Coupling through River Flow

Modeling the Land-Atmosphere Hydrologic Cycle and its Coupling through River Flow. William J. Gutowski, Jr. Dept. Geological & Atmospheric Sciences Iowa State University. START Temperate East Asia Regional Center (February 2000). … with much help from:.

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Modeling the Land-Atmosphere Hydrologic Cycle and its Coupling through River Flow

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  1. Modeling the Land-Atmosphere Hydrologic Cycle and its Coupling through River Flow William J. Gutowski, Jr. Dept. Geological & Atmospheric Sciences Iowa State University START Temperate East Asia Regional Center (February 2000)

  2. … with much help from: Charles J. Vörösmarty2, Mark Person3, Zekai Ötles1, Balazs Fekete2 and Jennifer York3 1 - ISU 2 - Univ. New Hampshire 3 - Univ. Minnesota START Temperate East Asia Regional Center (February 2000)

  3. Outline • CLASP - motivation - calibration/validation START Temperate East Asia Regional Center (February 2000)

  4. Outline • CLASP - motivation - calibration/validation • Water cycle coupling through river flow START Temperate East Asia Regional Center (February 2000)

  5. Outline • CLASP - motivation - calibration/validation • Water cycle coupling through river flow • Further directions START Temperate East Asia Regional Center (February 2000)

  6. Hydrologic Cycle - Modeling Issues • Time scale mismatch • land: slow • atmosphere: fast • Spatial scale mismatch • land: small • atmosphere: large

  7. Coupled Land - Atmosphere Simulation Program

  8. ATMOS: • single column • computed • vertical processes • specified lateral • forcing

  9. SVAT & SW/GW: • spatially • resolved • vertical coupling • by soil/veg • processes • lateral coupling • by river network

  10. 1600 Cells

  11. Application Kansas

  12. Application FIFE - Konza Prairie, Kansas 1987-1989

  13. Application FIFE - Konza Prairie, Kansas (from Oak Ridge DAAC FIFE page)

  14. Boundary Conditions: • NCEP NGM analyses • 9 Years (1985-93)

  15. Calibration/Validation (from Oak Ridge DAAC FIFE page) Observations: Betts and Ball (1998)

  16. Calibration/Validation • 1987: Calibration • 1988 & 1989: Validation

  17. Calibration/Validation • 1987: Calibration • 1988 & 1989: Validation • Surface: Grassland

  18. Calibration/Validation • 1987: Calibration • 1988 & 1989: Validation • Surface: Grassland • Primary Targets: • Surface Evapotranspiration • Precipitation

  19. Calibration/Validation: Adjustments • Precipitation • Effective RH (93.5%) • Convective precip.

  20. Calibration/Validation: Adjustments • Precipitation • Effective RH (93.5%) • Convective precip. • Soil Moisture • Root depth (1.42 m) • Water fraction

  21. Calibration/Validation: Adjustments • Precipitation • Effective RH (93.5%) • Convective precip. • Soil Moisture • Root depth (1.42 m) • Water fraction • “Green-up”

  22. BIAS = - 3 ; SDEV = 5 [W-m-2]

  23. OBS = 2.5 ; BIAS = +0.04 ; SDEV = 7.7 [mm-d-1]

  24. BIAS = +0.3 % ; SDEV = 10 %

  25. BIAS = +0.3 % ; SDEV = 10 %

  26. BIAS = + 1 ; SDEV = 6 [W-m-2]

  27. BIAS = - 4; SDEV = 21 [W-m-2]

  28. BIAS = - 4; SDEV = 21 [W-m-2]

  29. BIAS = + 3 ; SDEV = 9 [W-m-2]

  30. BIAS = + 6 ; SDEV = 7 [W-m-2]

  31. VALIDATION BIAS = - 48 , SDEV = 25BIAS = + 6 , SDEV = 23 [W-m-2]

  32. VALIDATION OBS = 1.4 ; BIAS = - 0.2 ; SDEV = 5.4 [mm-d-1]

  33. VALIDATION OBS = 2.5 ; BIAS = - 1.0; SDEV = 8.0 [mm-d-1]

  34. VALIDATION BIAS = + 33 , SDEV = 23BIAS = - 13 , SDEV = 22 [W-m-2]

  35. VALIDATION BIAS = + 22 , SDEV = 18BIAS = - 34 , SDEV = 41 [W-m-2]

  36. VALIDATION BIAS = - 19; SDEV = 18 [W-m-2]

  37. VALIDATION BIAS = - 13 ; SDEV = 7 [W-m-2]

  38. Outline • CLASP - motivation - calibration/validation • Water cycle coupling through river flow • Further directions

  39. Water cycle coupling through river flow

  40. Water cycle coupling through river flow

  41. Water cycle coupling through river flow

  42. Water cycle coupling through river flow • Configuration 1: • Pure grassland • No river inflow

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