Product overview

产品概述

The dataset uses CMAQ version 5.0.2 to simulate the spatiotemporal distribution of near-surface VOCs across mainland China on a 36 km × 36 km grid. The model is driven by WRF meteorological fields, uses SMOKE-processed emission inputs, and provides hourly concentrations for 33 VOC species to support multi-pollutant exposure assessment and environmental health research.

本数据集采用CMAQ 5.0.2，在36 km × 36 km网格上模拟中国大陆近地面VOCs的时空分布。模型由WRF气象场驱动，并采用SMOKE处理排放输入，可输出33种VOCs的小时浓度，为多组分暴露评估和环境健康研究提供基础数据。

Product characteristics

产品特点

• The CMAQ simulations captured the overall temporal variation of total VOCs and the timing of major pollution episodes; correlations between simulated and ground-observed concentrations were 0.76, 0.77, and 0.75 for alkanes, alkenes, and alkynes, respectively.
• CMAQ-simulated near-surface formaldehyde showed overall strong spatial agreement with TROPOMI-retrieved tropospheric formaldehyde column concentrations, with positive correlations across most of China and a southeast-to-northwest gradient that remained generally stable from 2019 to 2022.

• CMAQ模拟较好地捕捉了总VOCs的总体时间变化及主要污染事件的发生时段；烷烃、烯烃和炔烃模拟值与北京地面观测的相关系数分别为0.76、0.77和0.75。
• CMAQ模拟的近地面甲醛与TROPOMI卫星反演的对流层甲醛柱浓度在空间分布上总体具有较强一致性，在全国多数区域呈正相关，并表现出2019—2022年总体稳定的东南—西北梯度。

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