多種トレーサーおよび複数モデルを用いた温室効果気体の化学・輸送・フラックスの解明

2014 Fiscal Year Annual Research Report

• Project/Area Number: 22241008
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: PATRA Prabir 独立行政法人海洋研究開発機構, 地球表層物質循環研究分野, 主任研究員 (70392967)
• Co-Investigator(Kenkyū-buntansha): 石島 健太郎 独立行政法人海洋研究開発機構, 地球表層物質循環研究分野, 研究員 (90399494)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 温室効果気体（GHG） / オゾン層破壊物質（ODS） / モデル（model） / inverse modeling / 放出量推定

Outline of Annual Research Achievements

<< Sources, sinks and concentration of GHGs and ODSs in the troposphere and stratosphere >>
We have developed inverse modeling systems for simulating concentrations of several greenhouse gases (GHGs) and ozone depleting substances in the atmosphere. The emissions are taken from bottom-up emission inventories or prepared from the national statistics of industrial activities and loss is modeled online in the JAMSTEC’s ACTM (the CCSR/NIES/FRCGC ACGM-based Chemistry Transport Model). The hydroxyl (OH) radicals plays the most important role in loss of all hydrogen containing compounds, e.g., CH4, HCFCs, HFCs. We first estimated the relative concentration of OH in the northern and southern hemisphere (Patra et al., Nature, 2014), and inverse modeling of regional sources is done for the HFC-134a and HCHC-22 (Xiang et al., PNAS, 2014), and CH4. We are also continuing to analysis the sources and sinks of CO2 and CH4 in comparison with other major modeling groups in the world as a part of the Asian greenhouse gases synthesis.
A data analysis system has been developed through contract with Kokusai Kyogo (Dr. Ryu Saito), and three external researchers have been invited from Europe (Dr. Guillaume Monteil, Prof. Maarten Krol, Dr. Rona Thomson) in order to improve research collaboration and joint analysis of measurements and modeling results. Overall, we have completed development of multi-tracer modeling capability in ACTM, and primary sources and sinks of the two most important greenhouse gases (CO2 and CH4) have been estimated using inverse modeling of atmospheric observations.

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Observational evidence for interhemispheric hydroxyl-radical parity (2014)
  • Author(s): P. K. Patra, M. C. Krol, S. A. Montzka, T. Arnold, E. L. Atlas, B. R. Lintner, B. B. Stephens, B. Xiang, J. W. Elkins, P. J. Fraser, A. Ghosh, E. J. Hintsa, D. F. Hurst, K. Ishijima, P. B. Krummel, B. R. Miller, K. Miyazaki, F. L. Moore, J. Muhle, S. ODoherty, R. G. Prinn, L. P. Steele, M. Takigawa, H. J.Wang et al.
  • Journal Title: Nature Volume: 513 Pages: 219 - 223
  • DOI: doi:10.1038/nature13721
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Global emissions of refrigerants HCFC-22 and HFC-134a: Unforeseen seasonal contributions (2014)
  • Author(s): Bin Xiang, Prabir K. Patra, Stephen A. Montzka, Scot M. Miller, James W. Elkins, Fred L. Moore, Elliot L. Atlas, Ben R. Miller, Ray F. Weiss, Ronald G. Prinn, and Steven C. Wofsy
  • Journal Title: Proceedings of the National Academy of Sciences (PNAS) Volume: 111 Pages: 17379-17384
  • DOI: www.pnas.org/cgi/doi/10.1073/pnas.1417372111
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Carbon Flux Estimation By Using AGCM-Based Chemistry Transport Model for the Period 1990-2011 (2014)
  • Author(s): Tazu Saeki and Prabir K. Patra
  • Organizer: AGU fall meeting 2014
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] Inverse modeling of CO2 emissions for the period 1990-2011 (2014)
  • Author(s): Saeki, T. and P. K. Patra
  • Organizer: Third meeting of the Greenhouse gas budgets of the tropical and temperate Asia
  • Place of Presentation: JAMSTEC横浜研究所、神奈川県横浜市
  • Year and Date: 2014-04-08 – 2014-04-10