Global impacts of vegetation clumping on regulating land surface heat fluxes

Li, Fa; Hao, Dalei; Zhu, Qing; Yuan, Kunxiaojia; Braghiere, Renato K.; He, Liming; Luo, Xiangzhong; Wei, Shanshan; Riley, William J.; Zeng, Yelu; Chen, Min

doi:10.1016/j.agrformet.2023.109820

Global impacts of vegetation clumping on regulating land surface heat fluxes

Journal Article · Fri Dec 01 00:00:00 EST 2023 · Agricultural and Forest Meteorology

DOI:https://doi.org/10.1016/j.agrformet.2023.109820· OSTI ID:2309716

^[1]; ^[2]; Zhu, Qing ^[3]; Yuan, Kunxiaojia ^[3]; Braghiere, Renato K. ^[4]; He, Liming ^[5]; Luo, Xiangzhong ^[6]; Wei, Shanshan ^[6]; Riley, William J. ^[3]; Zeng, Yelu ^[1]; Chen, Min ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
Natural Resources Canada (Canada). Canada Centre for Mapping and Earth Observation
National Univ. of Singapore (Singapore)

The clumping index (CI) quantifies the non-random distribution of vegetation across space, which regulates the canopy radiative transfer processes and land surface carbon, water, and energy cycles. However, its impact on global surface energy budget, particularly sensible heat fluxes and surface temperature, is not well understood. Additionally, while there have been studies showing significant seasonal variations in CI, the impacts of these variations on surface energy fluxes remain unclear. In this study, we incorporated satellite-derived spatially and temporally explicit CI data into the Community Land Model version 5 (CLM5) to evaluate the effects of CI on global land energy fluxes. Our results showed that including CI increased the global mean sensible heat flux dissipated from ground by 3.9 W m^-2 (~18%), while decreasing the global mean vegetation sensible heat flux by 4.9 W m^-2 (~65%), resulting in a total sensible heat decrease of 1.0 W m^-2 (~3%). In contrast, CI increased the global mean latent heat flux by 0.8 W m^-2 (~2%), primarily due to increased evapotranspiration (up to 11 W m^-2) in tropical regions. We also found considerable impacts of seasonal variations in CI, particularly on sensible heat fluxes from ground and vegetation in evergreen needleleaf forests and deciduous needleleaf forests. Using constant CI rather than considering seasonal variations resulted in significant overestimation and underestimation of the sensible heat fluxes from vegetation and ground, respectively, in boreal summer. In conclusion, these changes in surface energy fluxes caused by CI and its seasonal variations led to up to 1.7 and 0.5 K differences in simulated mean ground temperature. These findings highlight the importance of including CI and considering its seasonal variations in modeling land surface energy fluxes.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC05-76RL01830

OSTI ID:: 2309716

Report Number(s):: PNNL-SA--181085

Journal Information:: Agricultural and Forest Meteorology, Journal Name: Agricultural and Forest Meteorology Vol. 345; ISSN 0168-1923

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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Global impacts of vegetation clumping on regulating land surface heat fluxes

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