Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-735-2018 |
Top-down constraints on global N2O emissions at optimal resolution: application of a new dimension reduction technique | |
Wells, Kelley C.1; 39;Doherty, Simon2 | |
2018-01-22 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:2页码:735-756 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England; Australia |
英文摘要 | We present top-down constraints on global monthly N2O emissions for 2011 from a multi-inversion approach and an ensemble of surface observations. The inversions employ the GEOS-Chem adjoint and an array of aggregation strategies to test how well current observations can constrain the spatial distribution of global N2O emissions. The strategies include (1) a standard 4D-Var inversion at native model resolution (4 degrees x 5 degrees), (2) an inversion for six continental and three ocean regions, and (3) a fast 4D-Var inversion based on a novel dimension reduction technique employing randomized singular value decomposition (SVD). The optimized global flux ranges from 15.9 TgNyr(-1) (SVD-based inversion) to 17.5-17.7 TgNyr(-1) (continental-scale, standard 4D-Var inversions), with the former better capturing the extratropical N2O background measured during the HIAPER Pole-to-Pole Observations (HIPPO) airborne campaigns. We find that the tropics provide a greater contribution to the global N2O flux than is predicted by the prior bottom-up inventories, likely due to underestimated agricultural and oceanic emissions. We infer an overestimate of natural soil emissions in the extratropics and find that predicted emissions are seasonally biased in northern midlatitudes. Here, optimized fluxes exhibit a springtime peak consistent with the timing of spring fertilizer and manure application, soil thawing, and elevated soil moisture. Finally, the inversions reveal a major emission underestimate in the US Corn Belt in the bottom-up inventory used here. We extensively test the impact of initial conditions on the analysis and recommend formally optimizing the initial N2O distribution to avoid biasing the inferred fluxes. We find that the SVD-based approach provides a powerful framework for deriving emission information from N2O observations: by defining the optimal resolution of the solution based on the information content of the inversion, it provides spatial information that is lost when aggregating to political or geographic regions, while also providing more temporal information than a standard 4D-Var inversion. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423124300002 |
WOS关键词 | NITROUS-OXIDE EMISSIONS ; METHANE EMISSIONS ; SINKS ; GOSAT ; SCALE ; ALGORITHMS ; ADJOINT ; TRENDS ; FLUXES ; STREAM |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/31098 |
专题 | 地球科学 |
作者单位 | 1.Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA; 2.Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA; 3.NOAA, Earth Syst Res Lab, Boulder, CO USA; 4.Emory Univ, Dept Environm Sci, Atlanta, GA 30322 USA; 5.MIT, Joint Program Sci & Policy Global Change, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 6.MIT, Ctr Global Change Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 7.Univ Bristol, Sch Chem, Bristol, Avon, England; 8.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; 9.Univ Colorado, CIRES, Boulder, CO 80309 USA; 10.CSIRO Oceans & Atmosphere, Climate Sci Ctr, Aspendale, Vic, Australia |
推荐引用方式 GB/T 7714 | Wells, Kelley C.,39;Doherty, Simon. Top-down constraints on global N2O emissions at optimal resolution: application of a new dimension reduction technique[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(2):735-756. |
APA | Wells, Kelley C.,&39;Doherty, Simon.(2018).Top-down constraints on global N2O emissions at optimal resolution: application of a new dimension reduction technique.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(2),735-756. |
MLA | Wells, Kelley C.,et al."Top-down constraints on global N2O emissions at optimal resolution: application of a new dimension reduction technique".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.2(2018):735-756. |
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