Abundant Nitrate and Nitric Acid Aerosol in the Upper Troposphere and Lower Stratosphere
Abundant Nitrate and Nitric Acid Aerosol in the Upper Troposphere and Lower Stratosphere
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DOI：
10.1029/2022gl100258
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发表时间：
2022-09
影响因子：
5.2
通讯作者：
P. Yu;Siying Lian;Yunqian Zhu;O. B. Toon;M. Höpfner;S. Borrmann
中科院分区：
文献类型：
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作者：
P. Yu;Siying Lian;Yunqian Zhu;O. B. Toon;M. Höpfner;S. Borrmann
对流层和平流层的硝酸盐气溶胶模式耦合到共同体地球系统模式进行了模拟。模拟的硝酸盐对气溶胶的质量分数贡献在对流层上部和平流层下部（UTLS）明显高于地面。现场观测和模拟结果表明，亚洲夏季风对流层顶硝酸盐气溶胶约占气溶胶质量的30%-40%。此外，在热带对流层顶，模拟的凝结硝酸颗粒占年平均气溶胶质量的20%左右，在南极的UTLS中，在6月至7月至8月，超过95%。我们的研究表明，在UTLS的热带，ASM和极地地区的极端寒冷的环境条件下，有害地有利于氨和硝酸的冷凝。在全球UTLS中广泛分布的硝酸盐气溶胶可能被气候模式忽略。
The tropospheric and stratospheric nitrate aerosol is simulated by a sectional aerosol model coupled to the Community Earth System Model. The simulated nitrate mass fractional contribution to aerosols is significantly higher in the upper troposphere and lower stratosphere (UTLS) than that at the surface. Both in situ measurements and simulations show that nitrate aerosol accounts for about 30%–40% of the aerosol mass at the tropopause of the Asian summer monsoon (ASM) region. Furthermore, simulated condensed nitric acid particles account for ∼20% of the annual mean aerosol mass at the tropical tropopause, and over 95% in the UTLS at the South Pole in June‐July‐August. Our study suggests that the extremely cold ambient conditions in the UTLS of the tropics, ASM and polar regions thermodynamically favor the condensation of ammonia and nitric acid. The widely distributed nitrate aerosol in the global UTLS may be overlooked by climate models.