Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD031262 |
Constraining Emissions of Volatile Organic Compounds Over the Indian Subcontinent Using Space-Based Formaldehyde Measurements | |
Chaliyakunnel, Sreelekha; Millet, Dylan B.; Chen, Xin | |
2019-10-15 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | India is an air pollution mortality hot spot, but regional emissions are poorly understood. We present a high-resolution nested chemical transport model (GEOS-Chem) simulation for the Indian subcontinent and use it to interpret formaldehyde (HCHO) observations from two satellite sensors (OMI and GOME-2A) in terms of constraints on regional volatile organic compound (VOC) emissions. We find modeled biogenic VOC emissions to be overestimated by similar to 30-60% for most locations and seasons, and derive a best estimate biogenic flux of 16 Tg C/year subcontinent-wide for year 2009. Terrestrial vegetation provides approximately half the total VOC flux in our base-case inversions (full uncertainty range: 44-65%). This differs from prior understanding, in which biogenic emissions represent >70% of the total. Our derived anthropogenic VOC emissions increase slightly (13-16% in the base case, for a subcontinent total of 15 Tg C/year in 2009) over RETRO year 2000 values, with some larger regional discrepancies. The optimized anthropogenic emissions agree well with the more recent CEDS inventory, both subcontinent-wide (within 2%) and regionally. An exception is the Indo-Gangetic Plain, where we find an underestimate for both RETRO and CEDS. Anthropogenic emissions thus constitute 37-50% of the annual regional VOC source in our base-case inversions and exceed biogenic emissions over the Indo-Gangetic Plain, West India, and South India, and over the entire subcontinent during winter and post-monsoon. Fires are a minor fraction (<7%) of the total regional VOC source in the prior and optimized model. However, evidence suggests that VOC emissions in the fire inventory used here (GFEDv4) are too low over the Indian subcontinent. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490077500001 |
WOS关键词 | INDO-GANGETIC PLAIN ; TOF-MS MEASUREMENTS ; ISOPRENE EMISSIONS ; URBAN SITE ; PREMATURE MORTALITY ; SURFACE OZONE ; NORTH-AMERICA ; TRACE GASES ; CARCINOGENIC BENZENOIDS ; ANTHROPOGENIC EMISSIONS |
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/187670 |
专题 | 气候变化 |
作者单位 | Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA |
推荐引用方式 GB/T 7714 | Chaliyakunnel, Sreelekha,Millet, Dylan B.,Chen, Xin. Constraining Emissions of Volatile Organic Compounds Over the Indian Subcontinent Using Space-Based Formaldehyde Measurements[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019. |
APA | Chaliyakunnel, Sreelekha,Millet, Dylan B.,&Chen, Xin.(2019).Constraining Emissions of Volatile Organic Compounds Over the Indian Subcontinent Using Space-Based Formaldehyde Measurements.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES. |
MLA | Chaliyakunnel, Sreelekha,et al."Constraining Emissions of Volatile Organic Compounds Over the Indian Subcontinent Using Space-Based Formaldehyde Measurements".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2019). |
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