The terrestrial carbon sink

    • Projecting the future of the U.S. carbon sink - Proceedings of the ...

      carbon sink in the coterminous United States accumulated ... represent approximately 45–90% of the total U.S. terrestrial carbon sink in the 1980s. Additional sinks caused by such factors as the accumulation of wood products, improved agricultural soil Fig.2.

    • Fire decline in dry tropical ecosystems enhances decadal land carbon sink

      The terrestrial carbon sink has significantly increased in the past decades, but the underlying mechanisms are still unclear. The current synthesis of process-based estimates of land and ocean sinks requires an additional sink of 0.6PgC yr−1 in the last decade to explain the observed airborne fraction.

    • [PDF File]ROUTINE CHECKS OF MODEL CONSISTENCY ON TERRESTRIAL CARBON SINK

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      The components of terrestrial carbon sink are estimated by means of models. Many different models are possible for any given component, and no criterion exists to pick one model over another [Cramer and Field, 1999]. Instead, the models form an ensemble, which is assumed to be a consistent estimator of the

    • [PDF File]Risk that the terrestrial carbon sink declines in the future

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      Risk that the terrestrial carbon sink declines in the future 1 April 2021, by Ola Nilsson Conceptual diagrams of the terrestrial carbon cycle and the action of elevated atmospheric [CO2] (eCO2). (a)

    • Tropical nighttime warming as a dominant driver of variability in the ...

      carbon budget | inversion model T errestrial ecosystems have been a substantial net sink of an-thropogenic carbon (C) emissions since the 1960s (1–4), but the terrestrial C sink could switch to a C source in the 21st century, resulting in a positive C cycle-climate feedback that would accelerate global surface warming with potentially major

    • A Large Terrestrial Carbon Sink in North America Implied by ... - JSTOR

      A Large Terrestrial Carbon Sink in North America Implied by Atmospheric and Oceanic Carbon Dioxide Data and Models S. Fan, M. Gloor, J. Mahiman, S. Pacala, J. Sarmiento, T. Takahashi, P. Tans Atmospheric carbon dioxide increased at a rate of 2.8 petagrams of carbon per year (Pg C year-1) during 1988 to 1992 (1 Pg = 1015 grams). Given estimates

    • [PDF File]SINKS FOR ANTHROPOGENIC CARBON.

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      tion and hence appears to be as large a carbon sink as the oceans, as shown in figure 1. Note, however, that the uncertainty in the estimated terrestrial source is very large, with a reported range of 0.6—2.5 Pg C/yr. The uncer- tainty in the land sink, which is estimated by differencing all the other components of the carbon budget, is corre-

    • [PDF File]South African National Carbon Sink Assessment: Assessment: suggested ...

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      and (b) terrestrial carbon stocks (input data from Scholes et al. 2013) Figure 3 The anticipated change in the extent of each land-cover type in South Africa during the period 2010-2020. For further explanation and assessed changes for the 2000-2010 period, please see GTI (2013). List of Tables

    • [PDF File]A Large Terrestrial Carbon Sink in North America Implied by Atmospheric ...

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      Northern Hemisphere sink is implied because the observed gradient is smaller than this. The original studies disagreed on whether the sink was predominantly oceanic (1) or terrestrial (2). Recent studies with atmospheric 13C/12C ratios (5) and oxygen concentrations (6) con-cluded that the sink is caused primarily by terrestrial biosphere uptake.

    • [PDF File]“Do Changes in Land Use Account for the Net Terrestrial Flux of Carbon ...

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      terrestrial carbon sink (in the tropics as well as in northern mid-latitudes). Historically this sink has been attributed to environmentally-enhanced growth (e.g., CO 2 fertilization). Introduction A recent study (Caspersen et al. 2000) suggests: 98% of growth in US forests is explained

    • [PDF File]Variability in Terrestrial Carbon Sinks Over Two Decades: Part 1 ...

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      Carbon sequestration in ecosystems involves the net uptake of CO2 from the atmosphere for persistent storage in sinks of terrestrial vegetation or soil pools. Land areas that consistently sequester carbon by growth in net ecosystem production are potentially important as future sinks for industrial CO2 emissions. Conversely, land areas that do ...

    • [PDF File]The terrestrial carbon budget of South and Southeast Asia

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      and sink fluxes makes it difficult to determine long-term trends in the net terrestrial carbon flux. There-fore, a better understanding of how the SSEA ecosys-tems respond to natural variability will reduce uncertainties in understanding the long-term trends and the magnitude and sign of the carbon-climate feedbacks.

    • Role of forest regrowth in global carbon sink dynamics

      regrowth forest sink of 0.35–0.6 Pg C y−1 for the 1990s (14) and 0.23–0.43 Pg C y−1 for the 2000s (15). This uncertainty as to the size of the terrestrial carbon sink due to forest regrowth has profound consequences for our understanding of the global carbon cycle. Whereas the saturation point of a CO 2-induced

    • Weathering in Terrestrial Ecosystems: Carbon Sink

      Weathering in Terrestrial Ecosystems: Carbon Sink P. Egorov and Yu. Svirezheva aPotsdam Institute for Climate Impact Research, Potsdam, D-14412 Potsdam, Germany (Yuri.Svirezhev@pik-potsdam.de) Abstract: In the framework of "active planetary cover" concept the influence of weathering on the atmosphere carbon and, as a consequence, on the climate is considered.

    • Uncertainty in the response of terrestrial carbon sink to environmental ...

      The terrestrial carbon (C) cycle plays a critical role in regulating the accumulation of C in the atmosphere 1, 2 and recent work suggests that the strength of the terrestrial sink is growing 1–4. Some3, 5 argue that CO 2 fertilization is the predominant driver of the growth in the terrestrial C sink, particularly in the tropics. However ...

    • [PDF File]Terrestrial carbonsink inthe Northern Hemisphere estimatedfrom the ...

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      terrestrial carbon sink in the northern hemisphere 865 Table1. Model simulated CO 2 concentration diVerences (ppm) CO 2 sources C N −C S C MLO −C SPO Corrections fossil emissiona) 1.87 2.49 factor, 0.75 terrestrial NEPb) −0.03 −0.03 oVset, 0.0 air–sea fluxc) 0.15 0.62 oVset, 0.47 land use fluxd −0.04 −0.11 oVset, −0.07

    • [PDF File]South African National Carbon Sink Assessment: Phase II: understanding ...

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      This is refl ected in magnitude and distribution of carbon stocks across the country, which is principally determined by annual rainfall, soil type and temperature (Fig 1). Phase 1 of the National Carbon Sink Assessment focused on understanding the distribution of carbon stocks across the country and provided the fi rst maps of terrestrial carbon

    • Model-data fusion in the studies of terrestrial carbon sink

      carbon dioxide from the atmosphere is carbon dioxide fertilization effect. Elevated carbon dioxide concentration enhances photosynthesis, and if turnover rate remains the same, leads to carbon accumulation in terrestrial ecosystems. The effect is quite small to be detected experimentally: the decadal rate of CO2 elevation may cause about

    • Model-data fusion in the studies of terrestrial carbon sink

      uncertainties in net terrestrial carbon uptake and the attribution of the so called ‘residual terrestrial uptake’ to well-established biophysical mechanisms. Global residual terrestrial uptake is estimated to be the same order of magnitude as oceanic uptake; however it is not an independent estimate. It is

    • [PDF File]Terrestrial carbon sinks in the Brazilian Amazon and Cerrado ... - NASA

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      estimate monthly carbon fluxes in terrestrial ecosystems of Brazilian Amazon and Cerrado regions over the period 2000–2004. Net ecosystem production (NEP) flux for at-mospheric CO2 in the region for these years was estimated. Consistently high carbon sink fluxes in terrestrial ecosystems on a yearly basis were found in the western portions ...

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