ABoVE/ASCENDS: Active Sensing of CO2, CH4, and Water Vapor, Alaska and Canada, 2017

This dataset provides in situ airborne measurements of atmospheric carbon dioxide (CO2), methane (CH4), and water vapor concentrations, plus air temperature, pressure, relative humidity, and wind speed values over Alaska and the Yukon and Northwest Territories of Canada during 2017-07-20 to 2017-08-08. Measurements were taken onboard a DC-8 aircraft during this Active Sensing of CO2 Emissions over Nights, Days and Seasons (ASCENDS) airborne deployment over portions of the Arctic-Boreal Vulnerability Experiment (ABoVE) domain. CO2 and CH4 were measured with NASA's Atmospheric Vertical Observations of CO2 in the Earth's Troposphere (AVOCET) instrument. Water vapor and relative humidity were measured with Diode Laser Hydrometer. Measurements of column-averaged dry-air mixing ratio CO2 measurements (XCO2) were taken with the CO2 Sounder Lidar instrument. The airborne CO2 Sounder is a pulsed, multi-wavelength Integrated Path Differential Absorption lidar. It estimates XCO2 in the nadir path from the aircraft to the scattering surface by measuring the shape of the 1572.33 nm CO2 absorption line. The data were collected in order to capture the spatial and temporal dynamics of the northern high latitude carbon cycle as part of ABoVE and are provided in ICARTT file format.

本数据集提供了2017年7月20日至2017年8月8日期间，在阿拉斯加及加拿大育空地区和西北地区进行的现场航空大气二氧化碳（CO2）、甲烷（CH4）和水汽浓度测量，以及气温、气压、相对湿度和风速等数据。这些测量是在DC-8飞机上进行的，属于ASCENDS（对CO2排放的夜间、白天和季节性主动感知）航空部署的一部分，该部署覆盖了北极-北方森林脆弱性实验（ABoVE）区域的部分地区。CO2和CH4的测量由NASA的AVOCET（地球对流层大气垂直观测）仪器完成。水汽和相对湿度则使用二极管激光湿度计进行测量。柱平均干空气混合比CO2（XCO2）的测量则采用CO2声学雷达仪器。该航空CO2声学雷达是一种脉冲式、多波长集成路径差分吸收激光雷达，通过测量1572.33 nm CO2吸收线的形状，估计飞机到散射表面的垂直路径上的XCO2。数据收集的目的是为了捕捉作为ABoVE一部分的北高纬度碳循环的空间和时间动态，并采用ICARTT文件格式提供。