The Role of Relative Humidity in Estimating Cloud Condensation Nuclei Number Concentration Through Aerosol Optical Data: Mechanisms and Parameterization Strategies

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2025-04-18 DOI:10.1029/2024GL112734

Yuying Wang, Rui Zhang, Nan Wang, Jialu Xu, Junhui Zhang, Chen Cui, Chunsong Lu, Bin Zhu, Yele Sun, Yannian Zhu

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Abstract

The number concentration of cloud condensation nuclei (N_CCN) is vital for quantifying aerosol-cloud interactions. Estimating N_CCN using aerosol optical properties is essential for obtaining continuous N_CCN data. This study highlights the significant impact of relative humidity (RH) on N_CCN estimation through aerosol optical data, especially at low supersaturations (SS). When RH exceeds a threshold (e.g., 60% at 0.2% SS), N_CCN estimation shifts from underestimation to overestimation, with the overestimation degree increasing with RH. Including RH in the estimation formula can effectively reduce this bias, although the aerosol optical hygroscopicity parameter is found to have a minimal effect on N_CCN estimation. Based on these insights, a new parameterization scheme for N_CCN estimation is proposed, which can significantly reduce N_CCN estimation bias when using wet aerosol optical data at high RH levels (40%–90%).

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相对湿度在气溶胶光学数据估计云凝结核数浓度中的作用：机制和参数化策略

云凝结核（NCCN）的数目浓度对于定量气溶胶与云的相互作用至关重要。利用气溶胶光学特性估计NCCN对于获得连续的NCCN数据至关重要。本研究强调了相对湿度（RH）对气溶胶光学数据估算NCCN的重要影响，特别是在低过饱和度（SS）下。当相对湿度超过一个阈值时（例如，在0.2% SS下，60%），NCCN估计由低估转向高估，高估程度随着相对湿度的增加而增加。虽然我们发现气溶胶光学吸湿性参数对NCCN估计的影响很小，但在估计公式中加入RH可以有效地减小这种偏差。基于这些见解，提出了一种新的NCCN估计参数化方案，该方案可以显著降低在高相对湿度（40%-90%）下使用湿气溶胶光学数据时的NCCN估计偏差。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.