目前气溶胶对植被固碳的影响仍然有很多不确定问题亟待研究。本文基于WRF-solar（Weather Report Forecast-solar）模型和FNL（Final Operational Global Analysis）数据，模拟了泾河流域2009-2020年气候变化，并使用控制变量法，通过将气溶胶光学厚度AOD（Aerosol Optical Depth）作为实验的外部输入变量，分析气溶胶对流域内太阳辐射、温度、降水、相对湿度等气象要素的影响。并以有、无气溶胶为情景，分别将两种情景模拟的气象要素作为CASA（Carnegie Ames Stanford Approach）模型的输入变量，计算泾河流域多年的植被净初级生产力和固碳量。研究结果表明：

（1）泾河流域AOD的时空变化与人类活动关系密切。2009-2020年泾河流域内AOD波动下降，下降速率为0.0046/a，年平均AOD范围在0.28到0.37之间。冬季AOD要远高于夏季。AOD数值随人类活动半径增大而降低。

（2）WRF-solar可以较准确地模拟区域气候要素。其模拟太阳辐射、气温、降水的量级、时间波动特征以及空间分布规律，结果合理可靠，能够反应研究区内能量收支状况。有气溶胶情景比无气溶胶情景的模拟效果要好，模拟的气象要素更加接近观测值，误差更小。

（3）气溶胶影响了流域内的气象要素。气溶胶导致年总太阳辐射减少约400MJ/m²，月尺度变化在25MJ/m²以上。气溶胶在流域内发挥了冷却效应，使得流域的多年平均温度降低0.37℃。而气溶胶对降雨量的影响主要体现在降低了夏季6-8月的降雨量，在其他月份影响很小。而且有气溶胶情景下的相对湿度也较高。

（4）气溶胶导致流域内植被生产力大面积降低，不利于流域内植被碳固定。泾河流域2009-2020年CO₂的固定量在逐年波动上升，无气溶胶情景下，多年平均固碳量为885.90g/m²，有气溶胶情景下，多年平均固碳量为836.23g/m²。气溶胶以影响太阳辐射变量的方式降低更多的固碳量。

The effect of aerosols on carbon sequestration by vegetation is still highly uncertain. Based on WRF-solar (Weather Report Forecast-solar) model and FNL (Final Operational Global Analysis) data, this paper simulated the climate change in the Jinghe River Basin from 2009 to 2020, and used the control variable method. AOD (Aerosol Optical Depth) was taken as the external input variable of the experiment, and the influence of aerosol on meteorological elements such as solar radiation, temperature, precipitation and relative humidity in the basin was considered. Using the two results as input variables of the CASA (Carnegie Ames Stanford Approach) model, the annual net primary productivity and carbon sequestration of vegetation in the Jinghe River Basin were calculated respectively under the aerosol-free scenario and the aerosol scenario. The results showed that:

(1) The temporal and spatial variation of AOD in Jinghe River Basin was closely related to human activities. AOD fluctuation decreased in the Jinghe River basin from 2009 to 2020, with a decrease rate of 0.0046/a, and the average annual AOD ranged from 0.28 to 0.37. AOD in winter was much higher than that in summer. The value of AOD decreased with the increase of human activity radius.

(2) WRF-solar can simulate regional climate elements accurately. It simulated the magnitude, time fluctuation characteristics and spatial distribution of solar radiation, temperature and precipitation. The results were reasonable and reliable, which can reflect the energy budget in the study area. The simulation performance of meteorological elements in the model with aerosol scenario was better than that in the model without aerosol scenario, and the simulated meteorological elements were closer to the observed values and the error was smaller.

(3) Aerosols affected the meteorological elements in the basin. Aerosols reduced annual total solar radiation by about 400MJ/m², with monthly scale variations of more than 25 MJ/m². The aerosol exerted a cooling effect in the basin, reducing the annual mean temperature of the basin by 0.37℃. However, the effect of aerosols on rainfall was mainly reflected in reducing the rainfall from June to August in summer, and had little effect in other months. In addition, the relative humidity in the aerosol scenario was higher than that in the no-aerosol scenario.

(4) Aerosols led to a large decrease in vegetation productivity, which was not conducive to vegetation carbon fixation in the basin. The fixed amount of CO₂ in the Jinghe River Basin from 2009 to 2020 fluctuated year by year, and the average fixed amount of CO₂ was 885.90g/m² in the no-aerosol scenario and 836.23g/m² in the aerosol scenario. Aerosol reduced more carbon sequestration by affecting solar radiation variables.