PEAT‐CLSM: A Specific Treatment of Peatland Hydrology in the NASA Catchment Land Surface Model

Journal of Advances in Modeling Earth Systems

J. Kurbatova¹  A. Lohila²  A. R. Desai³  K. Devito⁴  M. Bechtold⁵  G. J. M. De Lannoy⁵  M. B. Nilsson⁶  T. M. Munir⁷  E. R. Humphreys⁸  I. Burdun⁹  W. Bleuten^1,10  M. A. Bourgault^1,11  M. Grygoruk^1,12  R. D. Koster^1,13  S. P. Mahanama^1,13  R. H. Reichle^1,13  J. Klatt^1,14  A. Schneider^1,15  T. Grünwald^1,16  M. Röhl^1,17  B. Tiemeyer^1,18  C. Brümmer^1,18  J. S. Price^1,19 

[1] A. N. Severtsov Institute of Ecology and Evolution Russian Academy of Sciences Moscow Russia;Climate System Research Finnish Meteorological Institute Helsinki Finland;Department of Atmospheric and Oceanic Sciences University of Wisconsin‐Madison Madison WI USA;Department of Biological Sciences University of Alberta Edmonton Alberta Canada;Department of Earth and Environmental Sciences KU Leuven Heverlee Belgium;Department of Forest Ecology and Management Swedish University of Agricultural Sciences Umeå Sweden;Department of Geography University of Calgary Calgary Alberta Canada;Department of Geography and Environmental Studies Carleton University Ottawa Ontario Canada;Department of Geography, Institute of Ecology and Earth Sciences University of Tartu Tartu Estonia;Department of Physical Geography Utrecht University Utrecht The Netherlands;Département des sciences de la Terre et de l'atmosphère‐GEOTOP Research Center Université du Québec à Montréal Montréal, Québec Canada;Faculty of Civil and Environmental Engineering Warsaw University of Life Sciences‐SGGW Warsaw Poland;Global Modeling and Assimilation Office NASA Goddard Space Flight Center Greenbelt MD USA;Institute for Meteorology and Climatology‐Atmospheric Environmental Research (IMK‐IFU) Karlsruhe Institute of Technology (KIT) Garmisch‐Partenkirchen Germany;Institute of Botany and Landscape Ecology University of Greifswald Greifswald Germany;Institute of Hydrology and Meteorology Technische Universität Dresden Tharandt Germany;Institute of Landscape and Environment HfWU Nürtingen Nürtingen Germany;Thünen Institute of Climate‐Smart Agriculture Braunschweig Germany;Wetlands Hydrology Lab University of Waterloo Waterloo Ontario Canada;

关键词: peatland;    wetland;    land surface model;    hydrology;    microtopography;    carbon cycle;   

DOI  :  10.1029/2018MS001574

来源: DOAJ

【 摘 要 】

Abstract Peatlands are poorly represented in global Earth system modeling frameworks. Here we add a peatland‐specific land surface hydrology module (PEAT‐CLSM) to the Catchment Land Surface Model (CLSM) of the NASA Goddard Earth Observing System (GEOS) framework. The amended TOPMODEL approach of the original CLSM that uses topography characteristics to model catchment processes is discarded, and a peatland‐specific model concept is realized in its place. To facilitate its utilization in operational GEOS efforts, PEAT‐CLSM uses the basic structure of CLSM and the same global input data. Parameters used in PEAT‐CLSM are based on literature data. A suite of CLSM and PEAT‐CLSM simulations for peatland areas between 40°N and 75°N is presented and evaluated against a newly compiled data set of groundwater table depth and eddy covariance observations of latent and sensible heat fluxes in natural and seminatural peatlands. CLSM's simulated groundwater tables are too deep and variable, whereas PEAT‐CLSM simulates a mean groundwater table depth of −0.20 m (snow‐free unfrozen period) with moderate temporal fluctuations (standard deviation of 0.10 m), in significantly better agreement with in situ observations. Relative to an operational CLSM version that simply includes peat as a soil class, the temporal correlation coefficient is increased on average by 0.16 and reaches 0.64 for bogs and 0.66 for fens when driven with global atmospheric forcing data. In PEAT‐CLSM, runoff is increased on average by 38% and evapotranspiration is reduced by 19%. The evapotranspiration reduction constitutes a significant improvement relative to eddy covariance measurements.

【 授权许可】

Unknown