<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd">
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" article-type="research-article" dtd-version="3.0" xml:lang="en">
<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACP</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACP</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7324</issn>
<publisher><publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>GÃ¶ttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-11-2789-2011</article-id>
<title-group>
<article-title>Evaluating a 3-D transport model of atmospheric CO&lt;sub&gt;2&lt;/sub&gt; using ground-based, aircraft, and space-borne data</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Feng</surname>
<given-names>L.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Palmer</surname>
<given-names>P. I.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Yang</surname>
<given-names>Y.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Yantosca</surname>
<given-names>R. M.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Kawa</surname>
<given-names>S. R.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Paris</surname>
<given-names>J.-D.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Matsueda</surname>
<given-names>H.</given-names>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Machida</surname>
<given-names>T.</given-names>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>School of GeoSciences, University of Edinburgh, King&apos;s Buildings, Edinburgh EH9 3JN, UK</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>School of the Geosciences and Resources, China University of Geosciences, Beijing, China</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>School of Engineering and Applied Sciences, Harvard University, MA 02138, USA</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Atmospheric Chemistry and Dynamics Branch, NASA Goddard Space Flight Center, MD, 20771, USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Laboratoire des Sciences du Climat et de l&apos;Environnement, IPSL, CNRS-CEA-UVSQ, Gif sur Yvette, France</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>National Institute for Environmental Studies, Tsukuba, Japan</addr-line>
</aff>
<aff id="aff7">
<label>7</label>
<addr-line>now at: Department of Ecology, College of Urban and Environmental Science, Peking University, China</addr-line>
</aff>
<pub-date pub-type="epub">
<day>25</day>
<month>03</month>
<year>2011</year>
</pub-date>
<volume>11</volume>
<issue>6</issue>
<fpage>2789</fpage>
<lpage>2803</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.atmos-chem-phys.net/11/2789/2011/acp-11-2789-2011.html">This article is available from http://www.atmos-chem-phys.net/11/2789/2011/acp-11-2789-2011.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/11/2789/2011/acp-11-2789-2011.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/2789/2011/acp-11-2789-2011.pdf</self-uri>
<abstract>
<p>We evaluate the GEOS-Chem atmospheric transport model (v8-02-01) of CO&lt;sub&gt;2&lt;/sub&gt; over
2003â€“2006, driven by GEOS-4 and GEOS-5 meteorology from the NASA Goddard
Global Modeling and Assimilation Office, using surface,
aircraft and space-borne concentration measurements of CO&lt;sub&gt;2&lt;/sub&gt;. We use
an established ensemble Kalman Filter to estimate a posteriori
biospheric+biomass burning (BS + BB) and oceanic (OC) CO&lt;sub&gt;2&lt;/sub&gt; fluxes from
22 geographical regions, following the TransCom-3 protocol, using
boundary layer CO&lt;sub&gt;2&lt;/sub&gt; data from a subset of GLOBALVIEW surface sites.
Global annual net BS + BB + OC CO&lt;sub&gt;2&lt;/sub&gt; fluxes over 2004â€“2006 for GEOS-4 (GEOS-5) meteorology are
âˆ’4.4 Â± 0.9 (âˆ’4.2 Â± 0.9), âˆ’3.9 Â± 0.9 (âˆ’4.5 Â± 0.9), and âˆ’5.2 Â± 0.9
(âˆ’4.9 Â± 0.9) PgC yr&lt;sup&gt;âˆ’1&lt;/sup&gt;, respectively.  After taking into account
anthropogenic fossil fuel and bio-fuel emissions,
the global annual net CO&lt;sub&gt;2&lt;/sub&gt; emissions for 2004â€“2006 are estimated to
be 4.0 Â± 0.9 (4.2 Â± 0.9), 4.8 Â± 0.9 (4.2 Â± 0.9), and 3.8 Â± 0.9 (4.1 Â± 0.9) PgC yr&lt;sup&gt;âˆ’1&lt;/sup&gt;, respectively.
The estimated 3-yr total net emission for GEOS-4 (GEOS-5) meteorology is equal to  12.5 (12.4) PgC,
agreeing with other recent top-down estimates (12â€“13 PgC). The regional a posteriori fluxes
are broadly consistent in the sign and magnitude of the TransCom-3
study for 1992â€“1996, but we find larger net sinks over northern and southern continents.
We find large departures
from our a priori over Europe during summer 2003, over temperate
Eurasia during 2004, and over North America during 2005, reflecting an
incomplete description of terrestrial carbon dynamics.
We find GEOS-4 (GEOS-5) a posteriori CO&lt;sub&gt;2&lt;/sub&gt; concentrations reproduce the
observed surface trend of 1.91â€“2.43 ppm yr&lt;sup&gt;âˆ’1&lt;/sup&gt; (parts per million per year), depending on latitude,
within 0.15 ppm yr&lt;sup&gt;âˆ’1&lt;/sup&gt; (0.2 ppm yr&lt;sup&gt;âˆ’1&lt;/sup&gt;) and the seasonal cycle within 0.2 ppm
(0.2 ppm) at all latitudes.
We find the a posteriori model reproduces
the aircraft vertical profile measurements of CO&lt;sub&gt;2&lt;/sub&gt; over North
America and Siberia generally within 1.5 ppm in the free and upper
troposphere but can be biased by up to 4â€“5 ppm in the boundary layer
at the start and end of the growing season.
The model has a small negative bias in the free troposphere CO&lt;sub&gt;2&lt;/sub&gt; trend
(1.95â€“2.19 ppm yr&lt;sup&gt;âˆ’1&lt;/sup&gt;) compared to AIRS data which has a trend of
2.21â€“2.63 ppm yr&lt;sup&gt;âˆ’1&lt;/sup&gt; during 2004â€“2006, consistent with surface data.
Model CO&lt;sub&gt;2&lt;/sub&gt; concentrations in the upper troposphere, evaluated using
CONTRAIL (Comprehensive Observation Network for TRace gases by
AIrLiner) aircraft measurements, reproduce the magnitude and phase of
the seasonal cycle of CO&lt;sub&gt;2&lt;/sub&gt; in both hemispheres.
We generally find that the GEOS meteorology reproduces much of the
observed  tropospheric CO&lt;sub&gt;2&lt;/sub&gt; variability, suggesting that
these meteorological fields will help make significant progress in
understanding carbon fluxes as more data become available.</p>
</abstract>
<counts><page-count count="15"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple"> Bakwin, P S., Tans, P P., Stephens, B B., Wofsy, S C., Gerbig, C., and Grainger, A.: Strategies for measurement of atmospheric column means of carbon dioxide from aircraft using discrete sampling, J. Geophys. Res., 108, 4514, http://dx.doi.org/10.1029/2002JD003306doi:10.1029/2002JD003306, 2003. </mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple"> Bloom, S., da~Silva, A., Dee, D., Bosilovich, M., Chern, J.-D., Pawson, S., Schubert, S., Sienkiewicz, M., Stajner, I., Tan, W.-W., and Wu, M.-L.: Documentation and Validation of the Goddard Earth Observing System (GEOS) Data Assimilation System â€“ Version 4, Tech. Rep. Technical Report Series on Global Modeling and Data Assimilation 104606, 26, NASA Global Modeling and Assimilation Office, 2005. </mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple"> Brenkert, A L.: Carbon dioxide emission estimates from fossil-fuel burning, hydraulic cement production, and gas flaring for 1995 on a one degree grid cell basis, http://cdiac.esd.ornl.gov/epubs/ndp/ndp058a/ndp058a.html, carbon Dioxide Inf. Anal. Cent., Oak Ridge Natl. Lab., Oak Ridge, Tenn, 1998. </mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple"> Chahine, M T., Chen, L., Dimotakis, P., Jiang, X., Li, Q., Olsen, E T., Pagano, T., Randerson, J., and Yung, Y L.: Satellite remote sounding of mid-tropospheric CO2, Geophys. Res. Lett., 35, L17807, http://dx.doi.org/10.1029/2008GL035022doi:10.1029/2008GL035022, 2008. </mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple"> Chevallier, F., Ciais, P., Conway, T. J., Aalto, T., Anderson, B. E., Bousquet, P., Brunke, E. G., Ciattaglia, L., Esaki, Y., FrÃ¶hlich, M., Gomez, A., Gomez-Pelaez, A. J., Haszpra, L., Krummel, P. B., Langenfelds, R. L., Leuenberger, M., Machida, T., Maignan, F., Matsueda, H., Morguí, J. A., Mukai, H., Nakazawa, T., Peylin, P., Ramonet, M., Rivier, L., Sawa, Y., Schmidt, M., Steele, L. P., Vay, S. A., Vermeulen, A. T., Wofsy, S., and Worthy, D.: CO&lt;sub&gt;2&lt;/sub&gt; surface fluxes at grid point scale estimated from a global 21 year reanalysis of atmospheric measurements, J. Geophys. Res., 115, D21307, http://dx.doi.org/10.1029/2010JD013887doi:10.1029/2010JD013887, 2010. </mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple"> CT2009: CarbonTracker 2009, data available from http://carbontracker.noaa.gov, 2010.  </mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple"> Erickson, D. J., Mills, R. T., Gregg, J., Blasing, T. J., Hoffman, F. M., Andres, R. J., Devries, M., Zhu, Z., and Kawa, S. R.: An estimate of monthly global emissions of anthropogenic CO: Impact on the seasonal cycle of atmospheric CO&lt;sub&gt;2&lt;/sub&gt;, J. Geophys. Res., 113, G01023, http://dx.doi.org/10.1029/2007JG000435doi:10.1029/2007JG000435, 2008. </mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple"> Feng, L., Palmer, P. I., BÃ¶sch, H., and Dance, S.: Estimating surface CO&lt;sub&gt;2&lt;/sub&gt; fluxes from space-borne CO&lt;sub&gt;2&lt;/sub&gt; dry air mole fraction observations using an ensemble Kalman Filter, Atmos. Chem. Phys., 9, 2619â€“2633, http://dx.doi.org/10.5194/acp-9-2619-2009doi:10.5194/acp-9-2619-2009, 2009. </mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple"> Cooperative Atmospheric Data Project-Carbon Dioxide, CD-ROM, NOAA GMD, Boulder, Colorado (also available via anonymous FTP to ftp.cmdl.noaa.gov, Path: ccg/co2/GLOBALVIEW), 2009.  </mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple"> Gurney, K R., Law, R. M., Denning, A. S., Rayner, P. J., Baker, D., Bousquet, P., Bruhwiler, L., Chen, Y. H., Ciais, P., Fan, S., Fung, I. Y., Gloor, M., Heimann, M., Higuchi, K., John, J., Maki, T., Maksyutov, S., Masarie, K., Peylin, P., Prather, M., Pak, B. C., Randerson, J., Sarmiento, J., Taguchi, S., Takahashi, T., and Yuen, C. W.: Towards robust regional estimates of CO&lt;sub&gt;2&lt;/sub&gt; sources and sinks using atmospheric transport models, Nature, 415, 626â€“630, 2002.  </mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple"> Gurney, K. R., Law, R. M., Denning, A. S., Rayner, P. J., Baker, D., Bousquet, P., Bruhwiler, L., Chen, Y.-H., Ciais, P., Fan, S., Fung, I. Y., Gloor, M., Heimann, M., Higuchi, K., John, J., Kowalczyk, E., Maki, T., Maksyutov, S., Peylin, P., Prather, M., Pak, B. C., Sarmiento, J., Taguchi, S., Takahashi, T., and Yuen, C.-W.: TransCom 3 inversion intercomparison:1. Annual mean control results and sensitivity to transport and prior flux information, Tellus, 55B, 555â€“579, 2003.  </mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple"> Gurney, K. R., Law, R. M., Denning, A. S., Rayner, P. J., Pak, B. C., Baker, D., Bousquet, P., Bruhwiler, L., Chen, Yu-H., Ciais, P., Fung, I. Y., Heimann, M., John, J., Maki, T., Maksyutov, S., Peylin, P., Prather, M., and Taguchi, S.: Transcom 3 inversion intercomparison: Model mean results for the estimation of seasonal carbon sources and sinks, Global Biogeochem. Cy., 18, GB1010, http://dx.doi.org/10.1029/2003GB002111doi:10.1029/2003GB002111, 2004. </mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple"> Gurney, K R., Baker, D., Rayner, P., and Denning, S.: Interannual variations in continental-scale net carbon exchange and sensitivity to observing networks estimated from atmospheric CO&lt;sub&gt;2&lt;/sub&gt; inversions for the period 1980 to 2005, Global Biogeochem. Cy., 22, GB3025, http://dx.doi.org/10.1029/2007GB003082doi:10.1029/2007GB003082, 2008. </mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple"> Hack, J J.: Parameterization of moist convection in the National Center for Atmospheric Research Community Climate Model (CCM2), J. Geophys. Res., 99, 5551â€“5568, 1994. </mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple"> Heald, C L., Jacob, D J., Jones, D. B A., Palmer, P I., Logan, J A., Streets, D G., Sachse, G W., Gille, J C., Hoffman, R N., and Nehrkorn, T.: Comparative inverse analysis of satellite (MOPITT) and aircraft (TRACE-P) observations to estimate Asian sources of carbon monoxide, J. Geophys. Res., 109, D23306, http://dx.doi.org/10.1029/2004JD005185doi:10.1029/2004JD005185, 2004. </mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple"> Li, Q B., Jacob, D J., Yantosca, R M., Heald, C L., Singh, H B., Koike, M., Zhao, Y., Sachse, G W., and Streets, D G.: A global three-dimensional model analysis of the atmospheric budgets of HCN and CH3CN: Constraints from aircraft and ground measurements, J. Geophys. Res., 108, 8827, http://dx.doi.org/10.1029/2002JD003075doi:10.1029/2002JD003075, 2003. </mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple"> Li, Q., Palmer, P. I., Pumphrey, H. C., Bernath, P., and Mahieu, E.: What drives the observed variability of HCN in the troposphere and lower stratosphere?, Atmos. Chem. Phys., 9, 8531â€“8543, http://dx.doi.org/10.5194/acp-9-8531-2009doi:10.5194/acp-9-8531-2009, 2009. </mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple"> Marland, G., Boden, T A., and Andres, R J.: Global, Regional, And National CO&lt;sub&gt;2&lt;/sub&gt; Emissions, in Trends: A Compendium of Data on Global Change, Tech. Rep. 2007. 7346, Carbon Dioxide Information Analysis Center Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tenn., USA, 2007. </mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple"> Masarie, K A. and Tans, P P.: Extension and integration of atmospheric carbon dioxide data into a globally consistent measurement reocrd, J. Geophys. Res., 100, 522â€“529, 1995. </mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple"> Matsueda, H., Inoue, H Y., and Ishii, M.: Aircraft observation of carbon dioxide at 8â€“13 km altitude over the western Pacific from 1993 to 1999, Tellus B, 54, 1â€“21, 2002. </mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple"> Moorthi, S. and Suarez, M J.: Relaxed Arakawa-Schubert: A parameterization of moist convection for general circulation models, Mon. Weather Rev., 120, 978â€“1002, 1992. </mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple"> Olsen, S C. and Randerson, J T.: Differences between surface and column atmospheric CO&lt;sub&gt;2&lt;/sub&gt; and implications for carbon cycle research, J. Geophys. Res., 109, D02301, http://dx.doi.org/10.1029/2003JD003968doi:10.1029/2003JD003968, 2004. </mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple"> Palmer, P I., Suntharalingam, P., Jones, D. B A., Jacob, D J., Streets, D G., Fu, Q., Vay, S A., and Sachse, G W.: Using CO&lt;sub&gt;2&lt;/sub&gt;:CO correlations to improve inverse analyses of carbon fluxes, J. Geophys. Res., 111, D12318, http://dx.doi.org/10.1029/2005JD006697doi:10.1029/2005JD006697, 2006. </mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple"> Palmer, P. I., Barkley, M. P., and Monks, P. S.: Interpreting the variability of space-borne CO&lt;sub&gt;2&lt;/sub&gt; column-averaged volume mixing ratios over North America using a chemistry transport model, Atmos. Chem. Phys., 8, 5855â€“5868, http://dx.doi.org/10.5194/acp-8-5855-2008doi:10.5194/acp-8-5855-2008, 2008. </mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple"> Paris, J.-D., Ciais, P., Nedelec, P., Ramonet, M., Belan, B D., Arshinov, M Y., Golitsyn, G S., Granberg, I., Stohl, A., Cayez, G., Athier, G., Bournard, F., and Cousin, J M.: The YAK-AEROSIB transcontinental aircraft campaigns: new insights on the transport of CO&lt;sub&gt;2&lt;/sub&gt;, CO, and O&lt;sub&gt;3&lt;/sub&gt; across Siberia, Tellus B, 60, 551â€“568, 2008. </mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple"> Paris, J.-D., Ciais, P., Nedelec, P., Stohl, A., Belan, B D., Arshinov, M Y., , Carouge, C., Golitsyn, G S., and Granberg, I G.: New Insights on the Chemical Composition of the Siberian Air Shed from the YAK-AEROSIB Aircraft Campaigns, B. Am. Meteorol. Soc., 91, 625â€“641, 2010. </mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple"> Phillips, O L., Aragao, L. E. O C., Lewis, S L., Fisher, J B., Lloyd, J., Lopez-Gonzalez, G., Malhi, Y., Monteagudo, A., Peacock, J., Quesada, C A., van~der Heijden, G., Almeida, S., Amaral, I., Arroyo, L., Aymard, G., Baker, T R., Banki, O., Blanc, L., Bonal, D., Brando, P., Chave, J., Alves~de Oliveira, A C., Cardozo, N D., Czimczik, C I., Feldpausch, T R., Freitas, M A., Gloor, E., Higuchi, N., Jimenez, E., Lloyd, G., Meir, P., Mendoza, C., Morel, A., Neill, D A., Nepstad, D., Patino, S., Cristina~Penuela, M., Prieto, A., Ramirez, F., Schwarz, M., Silva, J., Silveira, M., Thomas, A S., ter Steege, H., Stropp, J., Vasquez, R., Zelazowski, P., Alvarez~Davila, E., Andelman, S., Andrade, A., Chao, K.-J., Erwin, T., Di~Fiore, A., Honorio~C, E., Keeling, H., Killeen, T J., Laurance, W F., Pena~Cruz, A., Pitman, N. C A., Nunez~Vargas, P., Ramirez-Angulo, H., Rudas, A., Salamao, R., Silva, N., Terborgh, J., and Torres-Lezama, A.: Drought Sensitivity of the Amazon Rainforest, Science, 323, 1344â€“1347, 2009. </mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple"> Randerson, J T., Thompson, M V., Conway, T J., Fung, I Y., and Field, C B.: The contribution of terrestrial sources and sinks to trends in the seasonal cycle of atmospheric carbon dioxide, Global Biogeochem. Cy., 11, 535â€“560, 1997. </mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple"> Rienecker, M., Suarez, M., R Todling, J B., Takacs, L., Liu, H.-C., Gu, W., Sienkiewicz, M., Koster, R., Gelaro, R., Stajner, I., and Nielsen, J.: The GEOS-5 Data Assimilation System - Documentation of Versions 5.0.1, 5.1.0, and 5.2.0, Tech. Rep. Technical Report Series on Global Modeling and Data Assimilation, 27, NASA Global Modeling and Assimilation Office, http://gmao.gsfc.nasa.gov/pubs/tm/, 2008. </mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple"> RÃ¶denbeck, C., Houweling, S., Gloor, M., and Heimann, M.: CO&lt;sub&gt;2&lt;/sub&gt; flux history 1982–2001 inferred from atmospheric data using a global inversion of atmospheric transport, Atmos. Chem. Phys., 3, 1919â€“1964, http://dx.doi.org/10.5194/acp-3-1919-2003doi:10.5194/acp-3-1919-2003, 2003. </mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple"> RÃ¶denbeck, C., Conway, T. J., and Langenfelds, R. L.: The effect of systematic measurement errors on atmospheric CO&lt;sub&gt;2&lt;/sub&gt; inversions: a quantitative assessment, Atmos. Chem. Phys., 6, 149â€“161, http://dx.doi.org/10.5194/acp-6-149-2006doi:10.5194/acp-6-149-2006, 2006. </mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple"> Shia, R L., Liang, M.-C., Miller, C E., and Yung, Y L.: CO&lt;sub&gt;2&lt;/sub&gt; in the upper troposphere: influence of stratosphere-troposphere exchange, Geophys. Res. Lett., 33, L14814, http://dx.doi.org/10.1029/2006GL026141doi:10.1029/2006GL026141, 2006. </mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple"> Singh, H B., Brune, W H., Crawford, J H., Jacob, D J., and Russell, P B.: Overview of the summer 2004 Intercontinental Chemical Transport Experiment North America (INTEX-A), J. Geophys. Res., 111, D24S01, http://dx.doi.org/10.1029/2006JD007905doi:10.1029/2006JD007905, 2006.   </mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple"> Stephens, B. B. Gurney, K. R. Tans, P. P. Sweeney, C. Peters, W. Bruhwiler, L. Ciais, P. Ramonet, M. Bousquet, P. Nakazawa, T. Aoki, S. Machida, T. Inoue, G. Vinnichenko, N. Lloyd, J. A. Jordan O. Shibistova R. L. Langenfelds L. P. Steele, R. J. Francey and A. S. Dennings: Weak Northern and Strong Tropical Land Carbon Uptake from Vertical Profiles of Atmospheric CO&lt;sub&gt;2&lt;/sub&gt;, Science, 316, 1732â€“1735, http://dx.doi.org/10.1126/science.1137004doi:10.1126/science.1137004, 2007. </mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple"> Suntharalingam, P., Randerson, J T., Krakauer, N., J.Jacob, D., and Logan, J A.: The influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO&lt;sub&gt;2&lt;/sub&gt; : implications for inversion analysis, Global Biogeochem. Cy., 19, GB4003, http://dx.doi.org/10.1029/2005GB002466doi:10.1029/2005GB002466, 2005.  </mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple"> Takahashi, T. Sutherland, S. C. Wanninkhof, R. Sweeney, C. Feely, R. A. Chipman, D. W. Hales, B. Friederich, G. Chavez, F. Watson, A. Bakker, D. C. E. Schuster, U. Metzl, N. Yoshikawa-Inoue, H. Ishii, M. Midorikawa, T. Nojiri, Y. Sabine, C. Olafsson, J. Arnarson, Th. S. Tilbrook, B. Johannessen, T. Olsen, A. Bellerby, R. KÃ¶rtzinger, A. Steinhoff, T. Hoppema, M. de Baar, H. J. W. Wong, C. S., Delille, B., and Bates, N. R.: Global sea-air CO&lt;sub&gt;2&lt;/sub&gt; flux based on climatological surface ocean $p$CO&lt;sub&gt;2&lt;/sub&gt;, and seasonal biological and temperature effects, Deep Sea Res. II, 49, 1601â€“1622, 2009. </mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple"> Thoning, K W., Tans, P P., and Komhyr, W D.: Atmospheric carbon dixoide at Mauna Loa Observatory: 2. Analysis of the NOAA GMCC data, 1974â€“1985, J. Geophys. Res., 94, 8549â€“8565, 1989. </mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple"> van der Werf, G. R., Randerson, J. T., Giglio, L., Collatz, G. J., Kasibhatla, P. S., and Arellano Jr., A. F.: Interannual variability in global biomass burning emissions from 1997 to 2004, Atmos. Chem. Phys., 6, 3423â€“3441, http://dx.doi.org/10.5194/acp-6-3423-2006doi:10.5194/acp-6-3423-2006, 2006. </mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple"> Wu, S., Mickley, L J., Jacob, D J., Logan, J A., Yantosca, R M., and (2007), D R.: Why are there large differences between models in global budgets of tropospheric ozone?, J. Geophys. Res., 112, D05302, http://dx.doi.org/10.1029/2006JD007801doi:10.1029/2006JD007801, 2007. </mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple"> Yang, Z. R. A W., Keppel-Aleks, G., Krakauer, N Y., Randerson, J T., Tans, P P., Sweeney, C., and Wennberg, P O.: New constraints on Northern Hemisphere growing season net flux, Geophys. Res. Lett., 34, L12807, http://dx.doi.org/10.1029/2007GL029742doi:10.1029/2007GL029742, 2007. </mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple"> Yevich, R. and Logan, J A.: An assessment of biofuel use and burning of agricultural waste in the developing world, Global Biogeochem. Cy., 17, 1095, http://dx.doi.org/10.1029/2002GB001952doi:10.1029/2002GB001952, 2003. </mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple"> Zhang, G J. and McFarlane, N A.: Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadian Climate Centre general circulation model, Atmos. Ocean, 33(3), 407â€“446, 1995. </mixed-citation>
</ref>
</ref-list>
</back>
</article>