TY - JOUR
T1 - Adapting observationally based metrics of biogeophysical feedbacks from land cover/land use change to climate modeling
AU - Chen, Liang
AU - Dirmeyer, Paul A.
N1 - Funding Information:
The authors wish to thank David Lawrence and Ahmed Tawfik at the National Center for Atmospheric Research for their assistance and helpful comments. ll the observational data sets used in this study are btained from the AmeriFlux network (http:// meriflux.ornl.gov/) and the European Fluxes Database luster (http://www.europefluxdata.eu/). We hank all site investigators and flux networks for their ork to make our metric evaluation possible. LME ata provided by the CESM1(CAM5) Last Millennium nsemble Community Project and supercomputing esources for LME and both offline and coupled landcover- hange sensitivity experiments were provided the NSF/CISL/Yellowstone supercomputing facility. his study was supported by the National Science Foundation (AGS-1419445). We also are grateful to he anonymous reviewers whose insightful comments elped improve our manuscript.
Publisher Copyright:
© 2016 IOP Publishing Ltd.
PY - 2016/2/24
Y1 - 2016/2/24
N2 - To assess the biogeophysical impacts of land cover/land use change (LCLUC) on surface temperature, two observation-based metrics and their applicability in climate modeling were explored in this study. Both metrics were developed based on the surface energy balance, and provided insight into the contribution of different aspects of land surface change (such as albedo, surface roughness, net radiation and surface heat fluxes) to changing climate. A revision of the first metric, the intrinsic biophysical mechanism, can be used to distinguish the direct and indirect effects of LCLUC on surface temperature. The other, a decomposed temperature metric, gives a straightforward depiction of separate contributions of all components of the surface energy balance. These two metrics well capture observed and model simulated surface temperature changes in response to LCLUC. Results from paired FLUXNET sites and land surface model sensitivity experiments indicate that surface roughness effects usually dominate the direct biogeophysical feedback of LCLUC, while other effects play a secondary role. However, coupled climate model experiments show that these direct effects can be attenuated by large scale atmospheric changes (indirect feedbacks). When applied to real-time transient LCLUC experiments, the metrics also demonstrate usefulness for assessing the performance of climate models and quantifying land-atmosphere interactions in response to LCLUC.
AB - To assess the biogeophysical impacts of land cover/land use change (LCLUC) on surface temperature, two observation-based metrics and their applicability in climate modeling were explored in this study. Both metrics were developed based on the surface energy balance, and provided insight into the contribution of different aspects of land surface change (such as albedo, surface roughness, net radiation and surface heat fluxes) to changing climate. A revision of the first metric, the intrinsic biophysical mechanism, can be used to distinguish the direct and indirect effects of LCLUC on surface temperature. The other, a decomposed temperature metric, gives a straightforward depiction of separate contributions of all components of the surface energy balance. These two metrics well capture observed and model simulated surface temperature changes in response to LCLUC. Results from paired FLUXNET sites and land surface model sensitivity experiments indicate that surface roughness effects usually dominate the direct biogeophysical feedback of LCLUC, while other effects play a secondary role. However, coupled climate model experiments show that these direct effects can be attenuated by large scale atmospheric changes (indirect feedbacks). When applied to real-time transient LCLUC experiments, the metrics also demonstrate usefulness for assessing the performance of climate models and quantifying land-atmosphere interactions in response to LCLUC.
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U2 - 10.1088/1748-9326/11/3/034002
DO - 10.1088/1748-9326/11/3/034002
M3 - Article
AN - SCOPUS:84962295152
VL - 11
JO - Environmental Research Letters
JF - Environmental Research Letters
SN - 1748-9326
IS - 3
M1 - 034002
ER -