ASCENDS: Airborne CO2 LAS Retrieval, Indianapolis, IN, USA, 2014

This dataset provides in situ airborne measurements of atmospheric carbon dioxide (CO2) over Indianapolis, Indiana (IN) on September 3, 2014 during the morning commuter period with heavy traffic emissions. Stationary source emissions are also included. The observed CO2 plume downwind of the urban area, along with the prevailing wind speed and direction, enabled estimations of emission rates. CO2 was measured with an airborne CO2 Laser Absorption Spectrometer (JPL CO2LAS) developed at NASA's Jet Propulsion Laboratory (JPL) to demonstrate the airborne Integrated Path Differential-Absorption (IPDA) lidar technique as a stepping stone to a capability for global measurements of CO2 concentrations from space. The CO2LAS measures the weighted, column averaged carbon dioxide between the aircraft and the ground using a continuous-wave heterodyne technique. The instrument operates at a 2.05 micron wavelength optimized for enhancing sensitivity to boundary layer carbon dioxide. Measurements were taken onboard a DC-8 aircraft during this Active Sensing of CO2 Emissions over Nights, Days and Seasons (ASCENDS) airborne deployment. The data are provided in HDF-5 format.

本数据集提供了2014年9月3日，在印第安纳州印第安纳波利斯（IN）城市区域，早晨通勤高峰期及重型交通排放期间，对大气二氧化碳（CO2）进行的原位航空测量。其中亦包含了固定源排放。观测到的城市区域下风向的CO2尾流，以及盛行风速和风向，均有助于排放速率的估算。CO2的测量采用了一种由美国国家航空航天局喷气推进实验室（JPL）开发的航空CO2激光吸收光谱仪（JPL CO2LAS），该仪器旨在展示航空集成路径差分吸收（IPDA）激光雷达技术，作为从太空进行全球CO2浓度测量的能力建设的基础。CO2LAS通过连续波外差技术，测量飞机与地面之间的加权、柱状平均二氧化碳浓度。该仪器在2.05微米波长下运行，优化了边界层二氧化碳灵敏度的增强。测量是在DC-8飞机上进行的，该测量活动属于ASCENDS（夜间、白天和季节性CO2排放的主动传感）航空部署计划。数据以HDF-5格式提供。