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Regional atmospheric CO2 inversion reveals seasonal and geographic differences in Amazon net biome exchange
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  • Personal Author:
  • Description:
    Understanding tropical rainforest carbon exchange and its response to heat and drought is critical for quantifying the effects of climate change on tropical ecosystems, including global climate-carbon feedbacks. Of particular importance for the global carbon budget is net biome exchange of CO2 with the atmosphere ( NBE), which represents nonfire carbon fluxes into and out of biomass and soils. Subannual and sub-Basin Amazon NBE estimates have relied heavily on process-based biosphere models, despite lack of model agreement with plot-scale observations. We present a new analysis of airborne measurements that reveals monthly, regional-scale (similar to 1-8 x 10(6) km(2)) NBE variations. We develop a regional atmospheric CO2 inversion that provides the first analysis of geographic and temporal variability in Amazon biosphere-atmosphere carbon exchange and that is minimally influenced by biosphere model-based first guesses of seasonal and annual mean fluxes. We find little evidence for a clear seasonal cycle in Amazon NBE but do find NBE sensitivity to aberrations from long-term mean climate. In particular, we observe increased NBE ( more carbon emitted to the atmosphere) associated with heat and drought in 2010, and correlations between wet season NBE and precipitation ( negative correlation) and temperature ( positive correlation). In the eastern Amazon, pulses of increased NBE persisted through 2011, suggesting legacy effects of 2010 heat and drought. We also identify regional differences in postdrought NBE that appear related to long-term water availability. We examine satellite proxies and find evidence for higher gross primary productivity ( GPP) during a pulse of increased carbon uptake in 2011, and lower GPP during a period of increased NBE in the 2010 dry season drought, but links between GPP and NBE changes are not conclusive. These results provide novel evidence of NBE sensitivity to short-term temperature and moisture extremes in the Amazon, where monthly and sub-Basin estimates have not been previously available.

  • DOI:
    http://dx.doi.org/10.1111/gcb.13305
  • Document Type:
    Journal Article
  • Collection(s):
    Office of Oceanic and Atmospheric Research (OAR)
    NOAA Cooperative Institutes
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      Coakley, K. J.; Miller, J. B.; Montzka, S. A.; Sweeney, C.; Miller, B.;
      Published Date:
      2016
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      Journal of Geophysical Research-Atmospheres, 121(12), 7489-7505.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
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      The measured C-14:C-12 isotopic ratio of atmospheric CO2 (and its associated derived Delta C-14 value) is an ideal tracer for determination of the fossil fuel derived CO2 enhancement contributing to any atmospheric CO2 measurement (C-ff). Given enoug...
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      Pandey, S.; Houweling, S.; Krol, M.; Aben, I.; Chevallier, F.; Dlugokencky, E. J.; Gatti, L. V.; Gloor, E.; Miller, J. B.; Detmers, R.; Machida, T.; Rockmann, T.;
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    7. The CU 2-D-MAX-DOAS instrument - Part 2: Raman scattering probability measurements and retrieval of aerosol optical properties
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      Ortega, I.; Coburn, S.; Berg, L. K.; Lantz, K.; Michalsky, J.; Ferrare, R. A.; Hair, J.; Hostetler, C. A.; Volkamer, R.;
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      Atmospheric Measurement Techniques, 9(8), 3893-3910.
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      Description:
      The multiannual global mean of aerosol optical depth at 550 nm (AOD(550))over land is similar to 0.19, and that over oceans is similar to 0.13. About 45% of the Earth surface shows AOD550 smaller than 0.1. There is a need for measurement techniques t...
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    8. Atmospheric histories and global emissions of halons H-1211 (CBrClF2), H-1301 (CBrF3), and H-2402 (CBrF2CBrF2)
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      Vollmer, M. K.; Muhle, J.; Trudinger, C. M.; Rigby, M.; Montzka, S. A.; Harth, C. M.; Miller, B. R.; Henne, S.; Krummel, P. B.; Hall, B. D.; Young, D.; Kim, J.; Arduini, J.; Wenger, A.; Yao, B.; Reimann, S.; O'Doherty, S.; Maione, M.; Etheridge, D. M.; Li, S. L.; Verdonik, D. P.; Park, S.; Dutton, G.; Steele, L. P.; Lunder, C. R.; Rhee, T. S.; Hermansen, O.; Schmidbauer, N.; Wang, R. H. J.; Hill, M.; Salameh, P. K.; Langenfelds, R. L.; Zhou, L. X.; Blunier, T.; Schwander, J.; Elkins, J. W.; Butler, J. H.; Simmonds, P. G.; Weiss, R. F.; Prinn, R. G.; Fraser, P. J.;
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      Atmospheric Measurement Techniques, 9(1), 133-158.
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      The SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) aboard the Envisat satellite provided measurements from August 2002 until April 2012. SCIAMACHY measured the scattered or direct sunlight using different observatio...
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    10. No significant increase in long-term CH4 emissions on North Slope of Alaska despite significant increase in air temperature
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      Sweeney, C.; Dlugokencky, E.; Miller, C. E.; Wofsy, S.; Karion, A.; Dinardo, S.; Chang, R. Y. W.; Miller, J. B.; Bruhwiler, L.; Crotwell, A. M.; Newberger, T.; McKain, K.; Stone, R. S.; Wolter, S. E.; Lang, P. E.; Tans, P.;
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      2016
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      Geophysical Research Letters, 43(12), 6604-6611.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Continuous measurements of atmospheric methane (CH4) mole fractions measured by NOAA's Global Greenhouse Gas Reference Network in Barrow, AK (BRW), show strong enhancements above background values when winds come from the land sector from July to Dec...
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    11. MIPAS IMK/IAA CFC-11 (CCl3F) and CFC-12 (CCl2F2) measurements: accuracy, precision and long-term stability
      Personal Author:
      Eckert, E.; Laeng, A.; Lossow, S.; Kellmann, S.; Stiller, G.; von Clarmann, T.; Glatthor, N.; Hopfner, M.; Kiefer, M.; Oelhaf, H.; Orphal, J.; Funke, B.; Grabowski, U.; Haenel, F.; Linden, A.; Wetzel, G.; Woiwode, W.; Bernath, P. F.; Boone, C.; Dutton, G. S.; Elkins, J. W.; Engel, A.; Gille, J. C.; Kolonjari, F.; Sugita, T.; Toon, G. C.; Walker, K. A.;
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      2016
      Source:
      Atmospheric Measurement Techniques, 9(7), 3355-3389.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Profiles of CFC-11 (CCl3F) and CFC-12 (CCl2F2) of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) aboard the European satellite Envisat have been retrieved from versions MIPAS/4.61 to MI-PAS/4.62 and MIPAS/5.02 to MIPAS/5.06 lev...
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    12. Strong regional atmospheric C-14 signature of respired CO2 observed from a tall tower over the midwestern United States
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      LaFranchi, B. W.; McFarlane, K. J.; Miller, J. B.; Lehman, S. J.; Phillips, C. L.; Andrews, A. E.; Tans, P. P.; Chen, H.; Liu, Z.; Turnbull, J. C.; Xu, X.; Guilderson, T. P.;
      Published Date:
      2016
      Source:
      Journal of Geophysical Research-Biogeosciences, 121(8), 2275-2295.
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Radiocarbon in CO2 ((CO2)-C-14) measurements can aid in discriminating between fast (< 1 year) and slower (> 5-10 years) cycling of C between the atmosphere and the terrestrial biosphere due to the 14C disequilibrium between atmospheric and terrestri...
      File Type:
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    13. A multiyear estimate of methane fluxes in Alaska from CARVE atmospheric observations
      Personal Author:
      Miller, S. M.; Miller, C. E.; Commane, R.; Chang, R. Y. W.; Dinardo, S. J.; Henderson, J. M.; Karion, A.; Lindaas, J.; Melton, J. R.; Miller, J. B.; Sweeney, C.; Wofsy, S. C.; Michalak, A. M.;
      Published Date:
      2016
      Source:
      Global Biogeochemical Cycles, 30(10), 1441-1453.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Methane (CH4) fluxes from Alaska and other arctic regions may be sensitive to thawing permafrost and future climate change, but estimates of both current and future fluxes from the region are uncertain. This study estimates CH4 fluxes across Alaska f...
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    14. Mesoscale modulation of air-sea CO2 flux in Drake Passage
      Personal Author:
      Song, H.; Marshall, J.; Munro, D. R.; Dutkiewicz, S.; Sweeney, C.; McGillicuddy, D. J.; Hausmann, U.;
      Published Date:
      2016
      Source:
      Journal of Geophysical Research-Oceans, 121(9), 6635-6649.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      We investigate the role of mesoscale eddies in modulating air-sea CO2 flux and associated biogeochemical fields in Drake Passage using in situ observations and an eddy-resolving numerical model. Both observations and model show a negative correlation...
      File Type:
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    15. Low-CCN concentration air masses over the eastern North Atlantic: Seasonality, meteorology, and drivers
      Personal Author:
      Wood, R.; Stemmler, J. D.; Remillard, J.; Jefferson, A.;
      Published Date:
      2017
      Source:
      Journal of Geophysical Research-Atmospheres, 122(2), 1203-1223.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      A 20 month cloud condensation nucleus concentration (N-CCN) data set from Graciosa Island (39 degrees N, 28 degrees W) in the remote North Atlantic is used to characterize air masses with low cloud condensation nuclei (CCN) concentrations. Low-CCN ev...
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    16. Summertime surface O-3 behavior and deposition to tundra in the Alaskan Arctic
      Personal Author:
      Van Dam, B.; Helmig, D.; Doskey, P. V.; Oltmans, S. J.;
      Published Date:
      2016
      Source:
      Journal of Geophysical Research-Atmospheres, 121(13), 8055-8066.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Atmospheric turbulence quantities, boundary layer ozone (O-3) levels, and O-3 deposition to the tundra surface were investigated at Toolik Lake, AK, during the 2011 summer season. Beginning immediately after snowmelt, a diurnal cycle of O-3 in the at...
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      Filetype[PDF - 2.83 MB]
    17. Separation of biospheric and fossil fuel fluxes of CO2 by atmospheric inversion of CO2 and (CO2)-C-14 measurements: Observation System Simulations
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      Basu, S.; Miller, J. B.; Lehman, S.;
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      2016
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      Atmospheric Chemistry and Physics, 16(9), 5665-5683.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      National annual total CO2 emissions from combustion of fossil fuels are likely known to within 5-10aEuro-% for most developed countries. However, uncertainties are inevitably larger (by unknown amounts) for emission estimates at regional and monthly ...
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      Filetype[PDF - 6.92 MB]
    18. Rising atmospheric methane: 2007-2014 growth and isotopic shift
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      Nisbet, E. G.; Dlugokencky, E. J.; Manning, M. R.; Lowry, D.; Fisher, R. E.; France, J. L.; Michel, S. E.; Miller, J. B.; White, J. W. C.; Vaughn, B.; Bousquet, P.; Pyle, J. A.; Warwick, N. J.; Cain, M.; Brownlow, R.; Zazzeri, G.; Lanoiselle, M.; Manning, A. C.; Gloor, E.; Worthy, D. E. J.; Brunke, E. G.; Labuschagne, C.; Wolff, E. W.; Ganesan, A. L.;
      Published Date:
      2016
      Source:
      Global Biogeochemical Cycles, 30(9), 1356-1370.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      From 2007 to 2013, the globally averaged mole fraction of methane in the atmosphere increased by 5.7 +/- 1.2 ppb yr(-1). Simultaneously, delta C-13(CH4) (a measure of the C-13/C-12 isotope ratio in methane) has shifted to significantly more negative ...
      File Type:
      Filetype[PDF - 1.72 MB]
    19. Advancements, measurement uncertainties, and recent comparisons of the NOAA frost point hygrometer
      Personal Author:
      Hall, E. G.; Jordan, A. F.; Hurst, D. F.; Oltmans, S. J.; Vomel, H.; Kuhnreich, B.; Ebert, V.;
      Published Date:
      2016
      Source:
      Atmospheric Measurement Techniques, 9(9), 4295-4310.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      The NOAA frost point hygrometer (FPH) is a balloon-borne instrument flown monthly at three sites to measure water vapor profiles up to 28 km. The FPH record from Boulder, Colorado, is the longest continuous stratospheric water vapor record. The instr...
      File Type:
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    20. A comprehensive estimate for loss of atmospheric carbon tetrachloride (CCl4) to the ocean
      Personal Author:
      Butler, J. H.; Yvon-Lewis, S. A.; Lobert, J. M.; King, D. B.; Montzka, S. A.; Bullister, J. L.; Koropalov, V.; Elkins, J. W.; Hall, B. D.; Hu, L.; Liu, Y. N.;
      Published Date:
      2016
      Source:
      Atmospheric Chemistry and Physics, 16(17), 10899-10910.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Extensive undersaturations of carbon tetrachloride (CCl4) in Pacific, Atlantic, and Southern Ocean surface waters indicate that atmospheric CCl4 is consumed in large amounts by the ocean. Observations made on 16 research cruises between 1987 and 2010...
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