Quantifying carbon-nitrogen feedbacks in the Community Land Model (CLM4)

被引：135

作者：

Bonan, Gordon B. ^{[1
]}

Levis, Samuel ^{[1
]}

机构：

[1] Natl Ctr Atmospher Res, Boulder, CO 80307 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷

基金：

美国国家科学基金会;

关键词：

CLIMATE; SOIL;

D O I：

10.1029/2010GL042430

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Recent studies indicate that nitrogen biogeochemistry affects the carbon cycle feedback in climate simulations. We use the Community Land Model version 4 (CLM4) with carbon-only and carbon-nitrogen biogeochemistry to assess the influence of nitrogen on the land carbon budget for 1973-2004. Carbon-only simulations show that the carbon gain from increasing atmospheric CO2 (the concentration-carbon feedback) is four times greater than the warming-induced carbon loss (the climate-carbon feedback) over the period 1973-2004. Nitrogen reduces both feedbacks compared with carbon-only biogeochemistry. The decrease in the concentration-carbon feedback is three times greater than the effect on the climate-carbon feedback. Thus, the influence of nitrogen on the CLM4 concentration-carbon feedback is of greater importance for near-term climate change simulations than its effect on the climate-carbon feedback. Furthermore, the land use carbon flux greatly exceeds these carbon-nitrogen biogeochemical feedbacks. Citation: Bonan, G. B., and S. Levis (2010), Quantifying carbon-nitrogen feedbacks in the Community Land Model (CLM4), Geophys. Res. Lett., 37, L07401, doi: 10.1029/2010GL042430.

引用

页数：6

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