[A-CG47] Global Carbon Cycle Observation and Analysis

convener:Kazuhito Ichii(Chiba University), Prabir Patra(Research Institute for Global Change, JAMSTEC), Forrest M. Hoffman(Oak Ridge National Laboratory), Makoto Saito(National Institute of Environmental Studies)

The Paris Agreement under the United Nations Framework Convention on Climate Change (UNFCCC) is a landmark agreement, which aims at reduction of greenhouse gases (GHGs) emission to keep the global warming below 2 degC. The national commitments and progress should be carefully monitored and verified by international bodies using different but complementary methodologies.

In recent years, many observations and techniques to monitor GHGs budget have expanded. The improvements include observational platforms for monitoring atmospheric GHGs, national or regional emission inventories, top-down models (e.g. atmospheric inverse models), and bottom-up models (e.g. process-based models). However, due to uncertainties in modeling and sparse observation networks, large uncertainties exist in GHG sources/sinks estimations at global and regional scales. These uncertainties lead to large variations in future projections of GHG budgets and climate changes.

The purpose of the session is to discuss state-of-the-art techniques for estimation of GHG (e.g. CO2, CH4, N2O) budgets at global and regional scales. The topic includes natural and anthropogenic processes, various methodologies (e.g. in-situ observation, aircraft monitoring, remote sensing, modeling), and various targets (e.g. atmosphere, terrestrial, and ocean), various spatial and temporal coverage (e.g. regional to global scales and past-present-future). Improved estimates of emissions from land use change, forest fires, and other anthropogenic sources (urban developments and thermal power station etc.) are also of interest. We also welcome discussions for designs and plans for future studies targeting urban and rural scale emission estimations using sophisticated modeling tools and inventories.

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[ACG47-01] Relative contributions of different methane emission categories in the continental East Asia inferred from stable carbon isotope measurements at Hateruma Station

★Invited Papers

*Taku Umezawa¹, Takuya Saito¹, Yasunori Tohjima¹, Yukio Terao¹, Akihiko Ito¹ (1.National Institute of Environmental Studies)

[ACG47-02] Process analysis of GHGs seasonal variabilty in the UT/LS region on account of emissions, dynamics and atmospheric chemistry

*Jagat Bisht¹, Prabir Patra^1,2, Naveen Chandra¹, Toshinobu Machida³, Naoko Saitoh² (1.Research Institute for Global Change (RIGC), JAMSTEC, Yokohama, 236-0001, Japan, 2.Center for Environmental Remote Sensing, Chiba University, Chiba, 263-8522, Japan, 3.CGER, National Institute for Environmental Studies, Tsukuba, Japan)

[ACG47-03] An observation-based synthetic reconstruction of surface ocean inorganic carbon variables

*Yosuke Iida^1,2, Yusuke Takatani¹, Atsushi Kojima¹, Takashi Nakamura^1,2, Masao Ishii^2,1 (1.Japan Meterological Agency, 2.Meteorological Research Institute)

[ACG47-04] Decoupling of projected oceanic uptake of carbon and heat in the 21^st century in a high carbon emission pathway

*Eric Mortenson¹, Andrew Lenton^1,2,3, Tom Trull^1,2, Elizabeth Shadwick^1,2,3, Xuebin Zhang^1,3, Matt Chamberlain¹ (1.Commonwealth Scientific and Industrial Research Organization, Australia, 2.Australian Antarctic Program Partnership, 3.The Centre for Southern Hemisphere Oceans Research)

[ACG47-05] Utility of total column CO₂ observations by satellites and atmospheric CO₂ inversion for evaluating carbon cycle processes in the Earth System Models

*Prabir Patra^1,2, Tomohiro Hajima¹, Ryu Saito³, Naveen Chandra¹, Yukio Yoshida⁴, Michio Kawamiya¹, Masayuki Kondo², Kazuhito Ichii², Akihiko Ito⁴, Dave Crisp⁵ (1.Research Institute for Global Change, JAMSTEC, 2.Center for Environmental Remote Sensing, Chiba University, Chiba 263-8522, Japan, 3.Disaster Risk Reduction and Environ. SBU, Kokusai Kogyo Co., Ltd., Tokyo, 183-0057, Japan, 4.Center for Global Environmental Research, NIES, Tsukuba, 305-8506, Japan, 5.NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA)

[ACG47-06] Diagnosing Climate–Carbon Cycle Feedbacks Constrained by ILAMB

*Forrest M. Hoffman^1,2, Nathan Collier¹, Mingquan Mu³, Cheng-En Yang², Gretchen Keppel-Aleks⁴, David M. Lawrence⁵, Charles D. Koven⁶, William J. Riley⁶, James T. Randerson³ (1.Oak Ridge National Laboratory, 2.University of Tennessee Knoxville, 3.University of California Irvine, 4.University of Michigan, 5.National Center for Atmospheric Research, 6.Lawrence Berkeley National Laboratory)