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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Regional US carbon sinks from three-dimensional atmospheric CO_2 sampling
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Regional US carbon sinks from three-dimensional atmospheric CO_2 sampling

机译：来自三维大气CO_2采样的美国区域碳汇

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摘要

Studies diverge substantially on the actual magnitude of the North American carbon budget. This is due to the lack of appropriate data and also stems from the difficulty to properly model all the details of the flux distribution and transport inside the region of interest. To sidestep these difficulties, we use here a simple budgeting approach to estimate land-atmosphere fluxes across North America by balancing the inflow and outflow of CO_2 from the troposphere. We base our study on the unique sampling strategy of atmospheric CO_2 vertical profiles over North America from the National Oceanic and Atmospheric Administration/Earth System Research Laboratory aircraft network, from which we infer the three-dimensional CO_2 distribution over the continent. We find a moderate sink of 0.5 ±0.4 PgCy~(-1) for the period 2004-2006 for the coterminous United States, in good agreement with the forest-inventory-based estimate of the first North American State of the Carbon Cycle Report, and averaged climate conditions. We find that the highest uptake occurs in the Midwest and in the Southeast. This partitioning agrees with independent estimates of crop uptake in the Midwest, which proves to be a significant part of the US atmospheric sink, and of secondary forest regrowth in the Southeast. Provided that vertical profile measurements are continued, our study offers an independent means to link regional carbon uptake to climate drivers.
机译：关于北美碳预算的实际规模，研究存在很大分歧。这是由于缺乏适当的数据，也是由于难以对感兴趣区域内通量分布和传输的所有细节进行正确建模的缘故。为了避免这些困难，我们在这里使用一种简单的预算方法，通过平衡对流层CO_2的流入和流出来估算整个北美的土地-大气通量。我们基于美国国家海洋与大气管理局/地球系统研究实验室飞机网络对北美大气CO_2垂直剖面的独特采样策略进行研究，由此推断出该大陆的三维CO_2分布。我们发现，在连续的美国，2004-2006年期间的中度吸收值为0.5±0.4 PgCy〜（-1），这与基于北美清单的第一份《碳循环状态报告》中基于森林资源的估算非常吻合，和平均气候条件。我们发现摄取最多的是中西部和东南部。这种划分与对中西部作物吸收的独立估计一致，事实证明中西部是美国大气汇的重要组成部分，也是东南部次生森林再生的重要组成部分。如果继续进行垂直剖面测量，我们的研究将提供一种独立的方法来将区域碳吸收与气候驱动因素联系起来。

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  • 作者

    Cyril Crevoisier; Colm Sweeney; Manuel Gloor; Jorge L. Sarmiento; Pieter P. Tans;

  • 作者单位

    Laboratoire de Meteorologie Dynamique, Centre National de la Recherche Scientifique, Institut Pierre Simon Laplace, Ecole Polytechnique, 91128 Palaiseau Cedex, France Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ 08544;

    rnCooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Boulder, CO National Oceanic and Atmospheric Administration/Earth System Research Laboratory, Boulder, CO 80305;

    rnEarth and Biosphere Institute and School of Geography, University of Leeds, Leeds, United Kingdom;

    rnAtmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ 08544;

    rnNational Oceanic and Atmospheric Administration/Earth System Research Laboratory, Boulder, CO 80305;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    atmospheric composition; biogeochemistry; carbon cycle; greenhouse gases;

    机译：大气成分生物地球化学碳循环温室气体;

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