Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD030183 |
Assessing the Iterative Finite Difference Mass Balance and 4D-Var Methods to Derive Ammonia Emissions Over North America Using Synthetic Observations | |
Li, Chi1; Martin, Randall V.1,2; Shephard, Mark W.3; Cady-Pereira, Karen; Cooper, Matthew J.1; Kaiser, Jennifer4; Lee, Colin J.1; Zhang, Lin6; Henze, Daven K.7 | |
2019-04-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:7页码:4222-4236 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA; Peoples R China |
英文摘要 | We evaluate two inverse modeling methods by conducting inversion experiments using the GEOS-Chem chemical transport model and its adjoint. We simulate synthetic NH3 column density as observed by the Cross-track Infrared Sounder over North America to test the ability of the iterative finite difference mass balance (IFDMB) and the four-dimensional variational assimilation (4D-Var) methods to recover known NH3 emissions. Comparing to the more rigorous 4D-Var method, the IFDMB approach requires 3-4 times lower computational cost and yields similar or smaller errors (12-17% vs 17-26%) in the top-down inventories at 2 degrees x 2.5 degrees resolution. These errors in IFDMB-derived emission estimates are amplified (53-62%) if compared to the assumed true emissions at 0.25 degrees x 0.3125 degrees resolution. When directly conducting inversions at 0.25 degrees x 0.3125 degrees, the IFDMB consistently exhibits larger errors (44-69% vs 30-45%) than the 4D-Var approach. Analysis of simulated differences in NH3 columns and in NH3 emissions suggests stronger misalignments at the finer resolution, since the local column is more strongly influenced by spatial smearing from neighboring grids. Adjoint calculations indicate that the number of adjacent grids needed to account for most (>65%) of the emission contributions to the local columnar NH3 abundance over an NH3 source site increases from similar to 1 at 2 degrees x 2.5 degrees to similar to 10 at 0.25 degrees x 0.3125 degrees, leading to increased errors especially in IFDMB. Applying inversion results at 2 degrees x 2.5 degrees to update the a priori emissions at 0.25 degrees x 0.3125 degrees could improve the accuracy of IFDMB inversions and reduce the computational cost of 4D-Var. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467147400035 |
WOS关键词 | HIGH-RESOLUTION INVERSION ; HIGH-SPATIAL-RESOLUTION ; SATELLITE-OBSERVATIONS ; ATMOSPHERIC AMMONIA ; DRY DEPOSITION ; NOX EMISSIONS ; METHANE EMISSIONS ; REACTIVE NITROGEN ; ADJOINT ; ISOPRENE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | 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/182435 |
专题 | 气候变化 |
作者单位 | 1.Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS, Canada; 2.Harvard Smithsonian Ctr Astrophys, Smithsonian Astrophys Observ, 60 Garden St, Cambridge, MA 02138 USA; 3.Environm Canada, Toronto, ON, Canada; 4.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA; 5.Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA; 6.Peking Univ, Dept Atmospher & Ocean Sci, Sch Phys, Lab Climate & Ocean Atmosphere Studies, Beijing, Peoples R China; 7.Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Li, Chi,Martin, Randall V.,Shephard, Mark W.,et al. Assessing the Iterative Finite Difference Mass Balance and 4D-Var Methods to Derive Ammonia Emissions Over North America Using Synthetic Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(7):4222-4236. |
APA | Li, Chi.,Martin, Randall V..,Shephard, Mark W..,Cady-Pereira, Karen.,Cooper, Matthew J..,...&Henze, Daven K..(2019).Assessing the Iterative Finite Difference Mass Balance and 4D-Var Methods to Derive Ammonia Emissions Over North America Using Synthetic Observations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(7),4222-4236. |
MLA | Li, Chi,et al."Assessing the Iterative Finite Difference Mass Balance and 4D-Var Methods to Derive Ammonia Emissions Over North America Using Synthetic Observations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.7(2019):4222-4236. |
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