NACP MCI: CO2 Emissions Inventory, Upper Midwest Region, USA., 2007

This data set provides a bottom-up CO2 emissions inventory for the mid-continent region of the United States for the year 2007. The study was undertaken as part of the North American Carbon Program (NACP) Mid-Continent Intensive (MCI) campaign.

Emissions for the MCI region were compiled from these resources into nine inventory sources (Table 1):(1) forest biomass and soil carbon, harvested woody products carbon, and agricultural soil carbon from the U.S. Greenhouse Gas (GHG) Inventory (EPA, 2010; Heath et al., 2011);
(2) high resolution data on fossil and biofuel CO2 emissions from Vulcan (Gurney et al,. 2009);
(3) CO2 uptake by agricultural crops, lateral transport in crop biomass harvest, and livestock CO2 emissions using USDA statistics (West et al., 2011);
(4) agricultural residue burning (McCarty et al., 2011);
(5) CO2 emissions from landfills (EPA, 2012);
(6) and CO2 losses from human respiration using U.S. Census data (West et al., 2009).

The CO2 inventory in the MCI region was dominated by fossil fuel combustion, carbon uptake during crop production, carbon export in biomass (commodities) from the region, and to a lesser extent, carbon sinks in forest growth and incorporation of carbon into timber products.

本数据集面向美国中大陆区域，提供2007年度自下而上式二氧化碳（CO2）排放清单。本研究作为北美碳计划（North American Carbon Program, NACP）中大陆密集观测（Mid-Continent Intensive, MCI）行动的组成部分实施。

MCI区域的排放数据从以下9类清单来源整合汇总（见表1）：
1. 取自美国温室气体（Greenhouse Gas, GHG）清单的森林生物量碳、土壤碳、采伐木质产品碳及农业土壤碳（EPA, 2010; Heath et al., 2011）；
2. 来自Vulcan数据库的化石燃料与生物燃料CO2排放高分辨率数据（Gurney et al., 2009）；
3. 基于美国农业部（United States Department of Agriculture, USDA）统计数据的农作物CO2吸收量、作物生物量收获过程中的横向迁移量及畜禽CO2排放量（West et al., 2011）；
4. 农业残余物焚烧产生的CO2排放（McCarty et al., 2011）；
5. 垃圾填埋场产生的CO2排放（EPA, 2012）；
6. 基于美国人口普查数据的人类呼吸作用产生的CO2流失量（West et al., 2009）。

MCI区域的CO2排放清单主要由化石燃料燃烧、农作物生产过程中的碳吸收、区域内生物量（大宗商品）携带的碳输出构成，另有占比较小的部分来自森林生长形成的碳汇以及碳在木材产品中的固存。