Assessing dynamic vegetation model parameter uncertainty across Alaskan arctic tundra plant communities

Euskirchen, Eugénie S.; Serbin, Shawn P.; Carman, Tobey B.; Fraterrigo, Jennifer M.; Genet, Hélène; Iversen, Colleen M.; Salmon, Verity; McGuire, A. David

doi:10.1002/eap.2499

Title: Assessing dynamic vegetation model parameter uncertainty across Alaskan arctic tundra plant communities

Journal Article · Mon Dec 13 00:00:00 EST 2021 · Ecological Applications

DOI:https://doi.org/10.1002/eap.2499· OSTI ID:1835373

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Institute of Arctic Biology University of Alaska Fairbanks Fairbanks Alaska 99775 USA
Terrestrial Ecosystem Science &, Technology Group Environmental Sciences Department Brookhaven National Laboratory Upton New York 11973 USA
Department of Natural Resources and Environmental Sciences University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA
Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

As the Arctic region moves into uncharted territory under a warming climate, it is important to refine the terrestrial biosphere models (TBMs) that help us understand and predict change. One fundamental uncertainty in TBMs relates to model parameters, configuration variables internal to the model whose value can be estimated from data. We incorporate a version of the Terrestrial Ecosystem Model (TEM) developed for arctic ecosystems into the Predictive Ecosystem Analyzer (PEcAn) framework. PEcAn treats model parameters as probability distributions, estimates parameters based on a synthesis of available field data, and then quantifies both model sensitivity and uncertainty to a given parameter or suite of parameters. We examined how variation in 21 parameters in the equation for gross primary production influenced model sensitivity and uncertainty in terms of two carbon fluxes (net primary productivity and heterotrophic respiration) and two carbon (C) pools (vegetation C and soil C). We set up different parameterizations of TEM across a range of tundra types (tussock tundra, heath tundra, wet sedge tundra, and shrub tundra) in northern Alaska, along a latitudinal transect extending from the coastal plain near $$Utqia\dot{g}ik$$ to the southern foothills of the Brooks Range, to the Seward Peninsula. TEM was most sensitive to parameters related to the temperature regulation of photosynthesis. Model uncertainty was mostly due to parameters related to leaf area, temperature regulation of photosynthesis, and the stomatal responses to ambient light conditions. Our analysis also showed that sensitivity and uncertainty to a given parameter varied spatially. At some sites, model sensitivity and uncertainty tended to be connected to a wider range of parameters, underlining the importance of assessing tundra community processes across environmental gradients or geographic locations. Generally, across sites, the flux of net primary productivity (NPP) and pool of vegetation C had about equal uncertainty, while heterotrophic respiration had higher uncertainty than the pool of soil C. Our study illustrates the complexity inherent in evaluating parameter uncertainty across highly heterogeneous arctic tundra plant communities. It also provides a framework for iteratively testing how newly collected field data related to key parameters may result in more effective forecasting of Arctic change.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: DE‐SC0016219; DE‐SC0012704; SC0012704; AC05-00OR22725; SC0016219

OSTI ID:: 1835373

Alternate ID(s):: OSTI ID: 1817192; OSTI ID: 1831697; OSTI ID: 1835377

Report Number(s):: BNL-221997-2021-JAAM; e2499

Journal Information:: Ecological Applications, Journal Name: Ecological Applications Vol. 32 Journal Issue: 2; ISSN 1051-0761

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
arctic carbon budget
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landscape heterogeneity
model uncertainty
parameter sensitivity
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Title: Assessing dynamic vegetation model parameter uncertainty across Alaskan arctic tundra plant communities

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