Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4)
Abstract
Land carbon sensitivity to atmospheric CO2 concentration (βL) and climate warming (γL) is a crucial part of carbon-climate feedbacks in the earth system. Using the Community Land Model version 4 with a coupled carbon-nitrogen cycle, we examine whether the inclusion of a dynamic global vegetation model (CNDV) significantly changes the land carbon sensitivity from that obtained with prescribed vegetation cover (CN). For decadal timescale in the late twentieth century, βL is not substantially different between the two models but γL of CNDV is stronger (more negative) than that of CN. The main reason for the difference in γL is not the concurrent change in vegetation cover driving the carbon dynamics, but rather the smaller nitrogen constraint on plant growth in CNDV compared with CN, which arises from the deviation of CNDV's near-equilibrium vegetation distribution from CN’s prescribed, historical land cover. The smaller nitrogen constraint makes the enhanced nitrogen mineralization with warming less effective in stimulating plant productivity to counter moisture stress in a warmer climate, leading to a more negative γL. This represents a new indirect pathway that has not been identified for dynamic vegetation in the coupled carbon-nitrogen cycle to affect the terrestrial carbon-climate feedbacks in the earth system.
- Authors:
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1337200
- Alternate Identifier(s):
- OSTI ID: 1353351
- Report Number(s):
- PNNL-SA-115218
Journal ID: ISSN 1748-9326
- Grant/Contract Number:
- SC0006693; AC05-76RL01830
- Resource Type:
- Published Article
- Journal Name:
- Environmental Research Letters
- Additional Journal Information:
- Journal Name: Environmental Research Letters Journal Volume: 11 Journal Issue: 12; Journal ID: ISSN 1748-9326
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 60 APPLIED LIFE SCIENCES; dynamic vegetation; carbon cycle; carbon-nitrogen cycle
Citation Formats
Sakaguchi, K., Zeng, X., Leung, LR, and Shao, P. Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4). United Kingdom: N. p., 2016.
Web. doi:10.1088/1748-9326/aa51d9.
Sakaguchi, K., Zeng, X., Leung, LR, & Shao, P. Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4). United Kingdom. https://doi.org/10.1088/1748-9326/aa51d9
Sakaguchi, K., Zeng, X., Leung, LR, and Shao, P. Thu .
"Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4)". United Kingdom. https://doi.org/10.1088/1748-9326/aa51d9.
@article{osti_1337200,
title = {Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4)},
author = {Sakaguchi, K. and Zeng, X. and Leung, LR and Shao, P.},
abstractNote = {Land carbon sensitivity to atmospheric CO2 concentration (βL) and climate warming (γL) is a crucial part of carbon-climate feedbacks in the earth system. Using the Community Land Model version 4 with a coupled carbon-nitrogen cycle, we examine whether the inclusion of a dynamic global vegetation model (CNDV) significantly changes the land carbon sensitivity from that obtained with prescribed vegetation cover (CN). For decadal timescale in the late twentieth century, βL is not substantially different between the two models but γL of CNDV is stronger (more negative) than that of CN. The main reason for the difference in γL is not the concurrent change in vegetation cover driving the carbon dynamics, but rather the smaller nitrogen constraint on plant growth in CNDV compared with CN, which arises from the deviation of CNDV's near-equilibrium vegetation distribution from CN’s prescribed, historical land cover. The smaller nitrogen constraint makes the enhanced nitrogen mineralization with warming less effective in stimulating plant productivity to counter moisture stress in a warmer climate, leading to a more negative γL. This represents a new indirect pathway that has not been identified for dynamic vegetation in the coupled carbon-nitrogen cycle to affect the terrestrial carbon-climate feedbacks in the earth system.},
doi = {10.1088/1748-9326/aa51d9},
journal = {Environmental Research Letters},
number = 12,
volume = 11,
place = {United Kingdom},
year = {Thu Dec 22 00:00:00 EST 2016},
month = {Thu Dec 22 00:00:00 EST 2016}
}
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https://doi.org/10.1088/1748-9326/aa51d9
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