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Title: Spatial Predictions and Associated Uncertainty of Annual Soil Respiration at the Global Scale

Abstract

Abstract Soil respiration (Rs), the soil‐to‐atmosphere CO 2 flux produced by microbes and plant roots, is a critical but uncertain component of the global carbon cycle. Our current understanding of the variability and dynamics is limited by the coarse spatial resolution of existing estimates. We predicted annual Rs and associated uncertainty across the world at 1‐km resolution using a quantile regression forest algorithm trained with observations from the global Soil Respiration Database spanning from 1961 to 2011. This model yielded a global annual Rs estimate of 87.9 Pg C/year with an associated global uncertainty of 18.6 (mean absolute error) and 40.4 (root mean square error) Pg C/year. The estimated annual heterotrophic respiration (Rh), derived from empirical relationships with Rs, was 49.7 Pg C/year over the same period. Predicted Rs rates and associated uncertainty varied widely across vegetation types, with the greatest predicted rates of Rs in evergreen broadleaf forests (accounting for 20.9% of global Rs). The greatest prediction uncertainties were in northern latitudes and arid to semiarid ecosystems, suggesting that these areas should be targeted in future measurement campaigns. This study provides predictions of Rs (and associated prediction uncertainty) at unprecedentedly high spatial resolution across the globe that could helpmore » constrain local‐to‐global process‐based models. Furthermore, it provides insights into the large variability of Rs and Rh across vegetation classes and identifies regions and vegetation types with poor model performance that should be prioritized for future data collection.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Delaware Geological Survey University of Delaware Newark DE USA
  2. Pacific Northwest National Laboratory Joint Global Change Research Institute MD USA
  3. Department of Geography University of Delaware Newark DE USA
  4. Department of Plant and Soil Sciences University of Delaware Newark DE USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1579755
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Global Biogeochemical Cycles
Additional Journal Information:
Journal Name: Global Biogeochemical Cycles Journal Volume: 33 Journal Issue: 12; Journal ID: ISSN 0886-6236
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

Citation Formats

Warner, D. L., Bond‐Lamberty, B., Jian, J., Stell, E., and Vargas, R. Spatial Predictions and Associated Uncertainty of Annual Soil Respiration at the Global Scale. United States: N. p., 2019. Web. doi:10.1029/2019GB006264.
Warner, D. L., Bond‐Lamberty, B., Jian, J., Stell, E., & Vargas, R. Spatial Predictions and Associated Uncertainty of Annual Soil Respiration at the Global Scale. United States. https://doi.org/10.1029/2019GB006264
Warner, D. L., Bond‐Lamberty, B., Jian, J., Stell, E., and Vargas, R. Tue . "Spatial Predictions and Associated Uncertainty of Annual Soil Respiration at the Global Scale". United States. https://doi.org/10.1029/2019GB006264.
@article{osti_1579755,
title = {Spatial Predictions and Associated Uncertainty of Annual Soil Respiration at the Global Scale},
author = {Warner, D. L. and Bond‐Lamberty, B. and Jian, J. and Stell, E. and Vargas, R.},
abstractNote = {Abstract Soil respiration (Rs), the soil‐to‐atmosphere CO 2 flux produced by microbes and plant roots, is a critical but uncertain component of the global carbon cycle. Our current understanding of the variability and dynamics is limited by the coarse spatial resolution of existing estimates. We predicted annual Rs and associated uncertainty across the world at 1‐km resolution using a quantile regression forest algorithm trained with observations from the global Soil Respiration Database spanning from 1961 to 2011. This model yielded a global annual Rs estimate of 87.9 Pg C/year with an associated global uncertainty of 18.6 (mean absolute error) and 40.4 (root mean square error) Pg C/year. The estimated annual heterotrophic respiration (Rh), derived from empirical relationships with Rs, was 49.7 Pg C/year over the same period. Predicted Rs rates and associated uncertainty varied widely across vegetation types, with the greatest predicted rates of Rs in evergreen broadleaf forests (accounting for 20.9% of global Rs). The greatest prediction uncertainties were in northern latitudes and arid to semiarid ecosystems, suggesting that these areas should be targeted in future measurement campaigns. This study provides predictions of Rs (and associated prediction uncertainty) at unprecedentedly high spatial resolution across the globe that could help constrain local‐to‐global process‐based models. Furthermore, it provides insights into the large variability of Rs and Rh across vegetation classes and identifies regions and vegetation types with poor model performance that should be prioritized for future data collection.},
doi = {10.1029/2019GB006264},
journal = {Global Biogeochemical Cycles},
number = 12,
volume = 33,
place = {United States},
year = {Tue Dec 17 00:00:00 EST 2019},
month = {Tue Dec 17 00:00:00 EST 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1029/2019GB006264

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Cited by: 58 works
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