NDLI: A simple hydrologic framework for simulating wetlands in climate and earth system models

Content Provider	Springer Nature Link
Author	Fan, Ying Miguez Macho, Gonzalo
Copyright Year	2010
Abstract	Wetlands are ecosystems of important functions in the earth’s climate system. Through relatively high evapotranspiration, they affect surface water and energy exchange with the atmosphere directly influencing the physical climate. Through CH4, CO2 and N2O fluxes, they regulate the biogeochemical cycles, indirectly influencing the physical climate. However, current models do not explicitly include the water table, present under all large and stable wetlands; model wetlands are identified as flat land with wet soil resulting from precipitation events. That is, the wetlands are only ‘wetted’ from above but not from below by the high water table. Furthermore, without the knowledge of the water table position, estimates of CH4 and other gases (e.g., CO2 and N2O) are poorly constrained. We present a simple hydrologic framework for simulating wetlands based on water table depth. A synthesis of hydrologic controls on wetlands highlights the key role that groundwater plays. It directly feeds wetlands, supports surface-water fed wetlands by maintaining a saturated substrate, and links land drainage to sea level by impeding drainage in lowlands. Forced by routine climate model output (precipitation–evapotranspiration-surface runoff), land topography, and sea level, we simulate the present-day water table in North America at the 1 km scale. We validate the simulation with water table observations and compare regions of shallow water table to mapped wetlands. Our results show that the framework captures the salient features of wetland distribution and extent at regional and continental scales, a direct result of large-scale groundwater convergence that nourishes the lowlands even in arid climates. The low requirement of forcing and computation make the framework easy to adopt in climate and earth system models for simulating wetland responses to climate and sea level change for the present, paleo reconstructions, and future projections.
Starting Page	253
Ending Page	278
Page Count	26
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	37
Issue Number	1-2
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wetlands Water table Climate modeling Earth system modeling North America Geophysics/Geodesy Meteorology/Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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