Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs
Earth system models (ESMs) have been widely used for projecting global vegetation carbon dynamics, yet how well ESMs performed for simulating vegetation carbon density remains untested. Here we have compiled observational data of vegetation carbon density from literature and existing data sets to ev...
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ftosti:oai:osti.gov:1393808 2023-07-30T04:01:34+02:00 Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs Song, Xia Hoffman, Forrest M. Iversen, Colleen M. Yin, Yunhe Kumar, Jitendra Ma, Chun Xu, Xiaofeng 2021-07-26 application/pdf http://www.osti.gov/servlets/purl/1393808 https://www.osti.gov/biblio/1393808 https://doi.org/10.1002/2017JG003914 unknown http://www.osti.gov/servlets/purl/1393808 https://www.osti.gov/biblio/1393808 https://doi.org/10.1002/2017JG003914 doi:10.1002/2017JG003914 58 GEOSCIENCES 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.1002/2017JG003914 2023-07-11T09:21:19Z Earth system models (ESMs) have been widely used for projecting global vegetation carbon dynamics, yet how well ESMs performed for simulating vegetation carbon density remains untested. Here we have compiled observational data of vegetation carbon density from literature and existing data sets to evaluate nine ESMs at site, biome, latitude, and global scales. Three variables—root (including fine and coarse roots), total vegetation carbon density, and the root:total vegetation carbon ratios (R/T ratios), were chosen for ESM evaluation. ESM models performed well in simulating the spatial distribution of carbon densities in root (r = 0.71) and total vegetation (r = 0.62). However, ESM models had significant biases in simulating absolute carbon densities in root and total vegetation biomass across the majority of land ecosystems, especially in tropical and arctic ecosystems. Particularly, ESMs significantly overestimated carbon density in root (183%) and total vegetation biomass (167%) in climate zones of 10°S–10°N. Substantial discrepancies between modeled and observed R/T ratios were found: the R/T ratios from ESMs were relatively constant, approximately 0.2 across all ecosystems, along latitudinal gradients, and in tropic, temperate, and arctic climatic zones, which was significantly different from the observed large variations in the R/T ratios (0.1–0.8). There were substantial inconsistencies between ESM-derived carbon density in root and total vegetation biomass and the R/T ratio at multiple scales, indicating urgent needs for model improvements on carbon allocation algorithms and more intensive field campaigns targeting carbon density in all key vegetation components. Other/Unknown Material Arctic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Journal of Geophysical Research: Biogeosciences 122 9 2282 2297 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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58 GEOSCIENCES 54 ENVIRONMENTAL SCIENCES |
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58 GEOSCIENCES 54 ENVIRONMENTAL SCIENCES Song, Xia Hoffman, Forrest M. Iversen, Colleen M. Yin, Yunhe Kumar, Jitendra Ma, Chun Xu, Xiaofeng Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs |
topic_facet |
58 GEOSCIENCES 54 ENVIRONMENTAL SCIENCES |
description |
Earth system models (ESMs) have been widely used for projecting global vegetation carbon dynamics, yet how well ESMs performed for simulating vegetation carbon density remains untested. Here we have compiled observational data of vegetation carbon density from literature and existing data sets to evaluate nine ESMs at site, biome, latitude, and global scales. Three variables—root (including fine and coarse roots), total vegetation carbon density, and the root:total vegetation carbon ratios (R/T ratios), were chosen for ESM evaluation. ESM models performed well in simulating the spatial distribution of carbon densities in root (r = 0.71) and total vegetation (r = 0.62). However, ESM models had significant biases in simulating absolute carbon densities in root and total vegetation biomass across the majority of land ecosystems, especially in tropical and arctic ecosystems. Particularly, ESMs significantly overestimated carbon density in root (183%) and total vegetation biomass (167%) in climate zones of 10°S–10°N. Substantial discrepancies between modeled and observed R/T ratios were found: the R/T ratios from ESMs were relatively constant, approximately 0.2 across all ecosystems, along latitudinal gradients, and in tropic, temperate, and arctic climatic zones, which was significantly different from the observed large variations in the R/T ratios (0.1–0.8). There were substantial inconsistencies between ESM-derived carbon density in root and total vegetation biomass and the R/T ratio at multiple scales, indicating urgent needs for model improvements on carbon allocation algorithms and more intensive field campaigns targeting carbon density in all key vegetation components. |
author |
Song, Xia Hoffman, Forrest M. Iversen, Colleen M. Yin, Yunhe Kumar, Jitendra Ma, Chun Xu, Xiaofeng |
author_facet |
Song, Xia Hoffman, Forrest M. Iversen, Colleen M. Yin, Yunhe Kumar, Jitendra Ma, Chun Xu, Xiaofeng |
author_sort |
Song, Xia |
title |
Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs |
title_short |
Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs |
title_full |
Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs |
title_fullStr |
Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs |
title_full_unstemmed |
Significant inconsistency of vegetation carbon density in CMIP5 Earth system models against observational data: Vegetation Carbon Density in ESMs |
title_sort |
significant inconsistency of vegetation carbon density in cmip5 earth system models against observational data: vegetation carbon density in esms |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1393808 https://www.osti.gov/biblio/1393808 https://doi.org/10.1002/2017JG003914 |
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Arctic |
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Arctic |
genre |
Arctic |
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Arctic |
op_relation |
http://www.osti.gov/servlets/purl/1393808 https://www.osti.gov/biblio/1393808 https://doi.org/10.1002/2017JG003914 doi:10.1002/2017JG003914 |
op_doi |
https://doi.org/10.1002/2017JG003914 |
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Journal of Geophysical Research: Biogeosciences |
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122 |
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9 |
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2282 |
op_container_end_page |
2297 |
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