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Title: Hillslope Hydrology in Global Change Research and Earth System Modeling

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1029/2018WR023903· OSTI ID:1523253
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [15];  [16];  [17];  [18];  [19];  [20] more »;  [9];  [20];  [2];  [21];  [22];  [20];  [23];  [24]; ORCiD logo [25];  [26];  [27];  [26];  [28];  [6];  [29];  [30];  [31] « less
  1. Rutgers University
  2. National Center for Atmospheric Research
  3. National Center for Atmospheric Research, Boulder, Colorado
  4. University Corporation for Atmospheric Research
  5. University of Virginia
  6. Pennsylvania State University
  7. University of Utah
  8. University of California, Berkeley
  9. Boise State University
  10. Oregon State University
  11. Department of Environmental Systems Science - ETH Zürich
  12. State University of New York at Buffalo
  13. University of Saskatchewan
  14. US Geological Survey
  15. University of Kansas
  16. University of California, Santa Barbara
  17. University of California, Riverside
  18. Duke University
  19. Universities of Freiburg
  20. University of Arizona
  21. Ghent University
  22. University of Bristol
  23. Northeastern University
  24. Purdue University
  25. BATTELLE (PACIFIC NW LAB)
  26. University of Washington
  27. Texas A & M University
  28. USDA Forest Service, PSW Research Station, Fresno CA
  29. Department of Catchment and Urban Hydrology, Deltares, Delft, The Netherlands
  30. University of Nevada - Reno
  31. Department of Physical Geography, Utrecht University

Earth System Models (ESMs) are essential tools for understanding and predicting global change, but they cannot explicitly resolve hillslope-scale terrain structures that have been long recognized by hydrologists as the fundamental organizers of water, energy, and biogeochemical stores and fluxes. Here, we bring together hydrologists, Critical Zone scientists and ESM developers, to explore how hillslope structures may modulate ESM grid-level water, energy and biogeochemical fluxes. In contrast to the traditional one-dimensional (1D), vertical, 2-3m deep, and free-draining soil hydrology in current ESM land models, we argue that 3D, lateral ridge-to-valley flow through shallow and deep paths, and insolation contrasts between sunny and shady slopes, are the top two basic, long-acknowledged, and readily quantifiable organizers of water and energy (and hence vegetation) within an ESM grid cell. We argue that these two processes will be most consequential where (and when) water and/or energy are limiting. We further hypothesize that if they are implemented in ESM land models, they will increase continental water storage and residence time, buffering land ecosystems against seasonal and interannual droughts. We explore efficient ways to capture these mechanisms in ESMs and identify critical knowledge gaps preventing us from scaling up hillslope to global processes. One such gap is our extremely limited view of the subsurface, where water is stored to support vegetation and released to stream baseflow and aquatic ecosystems. We conclude with a call for global syntheses activities and model experiments to assess the impact of hillslope hydrology on global change predictions.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1523253
Report Number(s):
PNNL-SA-138869
Journal Information:
Water Resources Research, Vol. 55, Issue 2
Country of Publication:
United States
Language:
English

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