CROCUS High-Frequency Measurements of CO₂, H₂O, Wind, and Temperature at University of Illinois Chicago

As of April 9, 2026: this dataset is currently being versioned to include data up to March 31, 2026. Once the versioning process is complete, new data files will be available for access. The dataset metadata will also be updated to reflect the data availability of the new data being versioned. Raw atmospheric measurements collected at the University of Illinois Chicago (UIC) as part of the Community Research on Climate and Urban Science (CROCUS) project. The data includes high-frequency measurements of carbon dioxide (CO₂) concentration, water vapor (H₂O) concentration, wind speed (U, V, W components), temperature, and atmospheric pressure. These raw data are recorded by the LI-7500DS Open Path CO₂/H₂O Analyzer and a sonic anemometer at a 10 Hz acquisition frequency, providing the necessary inputs for calculating fluxes of CO₂, H₂O, heat, and momentum. In addition to gas concentration measurements, the dataset includes diagnostic information from the instruments, including absorptance, sample and reference signals, and diagnostic values. The data were collected to study urban atmospheric conditions and contribute to flux calculations for urban climate research. These measurements form the basis for calculating 30-minute average fluxes of key atmospheric variables using the eddy covariance method. This dataset provides critical raw input data for researchers interested in atmospheric fluxes, urban air quality, and the interaction between the urban environment and atmospheric processes. The data is part of the U.S. Department of Energy’s Biological and Environmental Research (BER) program, under the CROCUS Urban Integrated Field Laboratory (UIFL) project.截至2026年4月9日：本数据集当前正处于版本更新流程中，将纳入截至2026年3月31日的全部观测数据。待版本更新流程完成后，将开放新增数据文件的访问权限，同时数据集元数据也将同步更新，以体现待版本化新增数据的可用状态。 本数据集为芝加哥伊利诺伊大学（University of Illinois Chicago, UIC）作为气候与城市科学社区研究（Community Research on Climate and Urban Science, CROCUS）项目的组成部分所采集的原始大气观测数据。 数据包含高频采集的二氧化碳（CO₂）浓度、水汽（H₂O）浓度、风速（U、V、W分量）、气温及大气压强观测值。上述原始数据由LI-7500DS开路式CO₂/H₂O分析仪与超声风速仪以10赫兹的采集频率记录，可为二氧化碳、水汽、热量与动量的通量计算提供必要输入参数。 除气体浓度观测项外，本数据集还包含仪器产出的诊断信息，具体包括吸收率、样本与参考信号及各类诊断值。 本次数据采集旨在研究城市大气环境，为城市气候研究中的通量计算提供支撑。此类观测数据是采用涡度协方差法计算关键大气变量30分钟平均通量的核心基础。 本数据集可为关注大气通量、城市空气质量以及城市环境与大气过程相互作用的科研人员提供关键的原始输入数据。 本数据集隶属于美国能源部（U.S. Department of Energy）生物与环境研究（Biological and Environmental Research, BER）计划下的CROCUS城市综合现场实验室（Urban Integrated Field Laboratory, UIFL）项目。