SAFARI 2000 EMISSIONS ESTIMATES, MODIS BURNED AREA PRODUCT, DRY SEASON 2000

The recently generated MODIS burned area product over southern Africa for the month of September 2000 was used to calculate regional biomass burning emissions from grassland and woodland fires for a number of trace gases and particulates at 1 km spatial resolution. A dynamic regional fuel load model developed for southern Africa in support of SAFARI 2000 fire emissions modeling is used to compute spatially explicit southern Africa fuel load data. Regional grassland and woodland emissions are estimated using ecosystem-specific emission factor algorithms for carbon dioxide (CO2), carbon monoxide (CO), methane (CH4), non-methane hydrocarbons (NMHC), and particulate matter with diameter less than 2.5 um (PM2.5) for southern African savanna fires (Korontzi et al., 2004). In addition, the emissions database for this region is expanded by incorporating emission factors for a variety of compounds, including oxygenated volatile organic compounds (OVOC), halocarbons, nitrogen oxides (NOx), ammonia (NH3), sulfur dioxide (SO2), hydrogen cyanide (HCN), and particulate ionic components measured during the SAFARI 2000 dry season field campaign.The data set archived by ORNL DAAC provides a MODIS-based estimate of CO (carbon monoxide) pyrogenic emissions (in kg) for southern Africa in September 2000 at 1 km. The data image file is stored in GeoTIFF binary format. Pyrogenic emissions of the other trace gases and particulates estimated by this study will be archived by ORNL DAAC when the data sets are finalized.

本研究采用2000年9月南非地区最新生成的MODIS火烧面积产品（MODIS Burned Area Product），以1千米空间分辨率，计算了草原与林地火灾产生的多种痕量气体及颗粒物的区域燃烧排放量。本研究采用为支持SAFARI 2000火灾排放建模而开发的南非动态区域燃料负荷模型，计算得到空间显式的南非燃料负荷数据。针对南非稀树草原火灾，本研究采用针对特定生态系统的排放因子算法，估算了二氧化碳（CO₂）、一氧化碳（CO）、甲烷（CH₄）、非甲烷烃类（NMHC）以及直径小于2.5微米的颗粒物（PM2.5）的区域草原与林地燃烧排放量（Korontzi等人，2004）。此外，本研究通过纳入SAFARI 2000旱季野外试验中测得的多种化合物排放因子，扩充了该区域的排放数据库，所纳入的化合物包括含氧挥发性有机物（OVOC）、卤代烃、氮氧化物（NOₓ）、氨（NH₃）、二氧化硫（SO₂）、氰化氢（HCN）以及颗粒物离子组分。由橡树岭国家实验室分布式主动存档中心（ORNL DAAC）归档的数据集，提供了2000年9月南非地区基于MODIS的一氧化碳（CO）火成排放量（单位：千克）估算结果，空间分辨率为1千米。该数据影像文件以GeoTIFF二进制格式存储。本研究估算得到的其他痕量气体及颗粒物火成排放数据，将在数据集定稿后由ORNL DAAC归档发布。