{"title":"南亚地区大气气溶胶空间分布和热带季节内振荡","authors":"Binisia Sanatan, V. Vinoj, Kiranmayi Landu","doi":"10.1016/j.apr.2024.102199","DOIUrl":null,"url":null,"abstract":"<div><p>Intra-seasonal oscillations (ISO) are well known to modulate the weather phenomena which in turn are known to influence the atmospheric aerosol loading. This study investigates how aerosol loading is modulated in ISO spatio-temporal scales over the Indian region using long-term satellite aerosol optical depth data from Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, onboard Terra Satellite. It is shown that Madden-Julian Oscillation (MJO) and Equatorial Rossby waves (ER) have the highest effect (15–20% of the mean) followed by Mixed-Rossby-gravity and Tropical depressions (MT), and Kelvin wave (KE) (5–15%). Further, a dipolar pattern in aerosol loading was observed, with poles over the Arabian Sea and the Bay of Bengal. These variabilities were found to be mainly driven by anomalous winds associated with the ISOs. Similar to aerosol, dipolar signatures in the atmospheric aerosol radiative forcing (ARF) were also observed with clearer patterns. However, the forcing poles are not centered exactly where aerosol poles were observed, indicating the effect of differential properties of aerosols on the aerosol radiative forcing. Quantitatively, at the surface level, modulation in ARF is up to 3 Wm<sup>-2</sup> (15%) for MJO and ER, and up to 2 Wm<sup>-2</sup> (5%) for KE and MT; in the atmosphere and at the top of the atmosphere, modulation is up to 2 Wm<sup>-2</sup> (15%) for MJO and ER, and up to 1 Wm<sup>-2</sup> (5%) for KE and MT.</p></div>","PeriodicalId":8604,"journal":{"name":"Atmospheric Pollution Research","volume":"15 9","pages":"Article 102199"},"PeriodicalIF":3.9000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The atmospheric aerosol spatial distribution and tropical intra-seasonal oscillations over the South Asian region\",\"authors\":\"Binisia Sanatan, V. Vinoj, Kiranmayi Landu\",\"doi\":\"10.1016/j.apr.2024.102199\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Intra-seasonal oscillations (ISO) are well known to modulate the weather phenomena which in turn are known to influence the atmospheric aerosol loading. This study investigates how aerosol loading is modulated in ISO spatio-temporal scales over the Indian region using long-term satellite aerosol optical depth data from Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, onboard Terra Satellite. It is shown that Madden-Julian Oscillation (MJO) and Equatorial Rossby waves (ER) have the highest effect (15–20% of the mean) followed by Mixed-Rossby-gravity and Tropical depressions (MT), and Kelvin wave (KE) (5–15%). Further, a dipolar pattern in aerosol loading was observed, with poles over the Arabian Sea and the Bay of Bengal. These variabilities were found to be mainly driven by anomalous winds associated with the ISOs. Similar to aerosol, dipolar signatures in the atmospheric aerosol radiative forcing (ARF) were also observed with clearer patterns. However, the forcing poles are not centered exactly where aerosol poles were observed, indicating the effect of differential properties of aerosols on the aerosol radiative forcing. Quantitatively, at the surface level, modulation in ARF is up to 3 Wm<sup>-2</sup> (15%) for MJO and ER, and up to 2 Wm<sup>-2</sup> (5%) for KE and MT; in the atmosphere and at the top of the atmosphere, modulation is up to 2 Wm<sup>-2</sup> (15%) for MJO and ER, and up to 1 Wm<sup>-2</sup> (5%) for KE and MT.</p></div>\",\"PeriodicalId\":8604,\"journal\":{\"name\":\"Atmospheric Pollution Research\",\"volume\":\"15 9\",\"pages\":\"Article 102199\"},\"PeriodicalIF\":3.9000,\"publicationDate\":\"2024-05-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Atmospheric Pollution Research\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1309104224001648\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Atmospheric Pollution Research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1309104224001648","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
摘要
众所周知,季节内振荡(ISO)会调节天气现象,而天气现象又会影响大气气溶胶负荷。本研究利用搭载在 Terra 卫星上的中分辨率成像分光仪(MODIS)传感器的长期卫星气溶胶光学深度数据,研究了印度地区的气溶胶负荷在 ISO 时空尺度上是如何调节的。结果表明,马登-朱利安涛动(MJO)和赤道罗斯比波(ER)的影响最大(占平均值的 15-20%),其次是混合罗斯比重力和热带低气压(MT)以及开尔文波(KE)(5-15%)。此外,还观察到气溶胶负荷的两极模式,极点在阿拉伯海和孟加拉湾。这些变化主要是由与 ISOs 有关的异常风引起的。与气溶胶类似,在大气气溶胶辐射强迫(ARF)中也观测到了双极特征,其模式更加清晰。不过,气溶胶辐射强迫的极点并不完全位于气溶胶极点的中心,这表明气溶胶的不同特性对气溶胶辐射强迫有影响。从数量上看,在地表水平,MJO 和 ER 的气溶胶辐射强迫调制达 3 Wm(15%),KE 和 MT 的气溶胶辐射强迫调制达 2 Wm(5%);在大气层和大气顶部,MJO 和 ER 的气溶胶辐射强迫调制达 2 Wm(15%),KE 和 MT 的气溶胶辐射强迫调制达 1 Wm(5%)。
The atmospheric aerosol spatial distribution and tropical intra-seasonal oscillations over the South Asian region
Intra-seasonal oscillations (ISO) are well known to modulate the weather phenomena which in turn are known to influence the atmospheric aerosol loading. This study investigates how aerosol loading is modulated in ISO spatio-temporal scales over the Indian region using long-term satellite aerosol optical depth data from Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, onboard Terra Satellite. It is shown that Madden-Julian Oscillation (MJO) and Equatorial Rossby waves (ER) have the highest effect (15–20% of the mean) followed by Mixed-Rossby-gravity and Tropical depressions (MT), and Kelvin wave (KE) (5–15%). Further, a dipolar pattern in aerosol loading was observed, with poles over the Arabian Sea and the Bay of Bengal. These variabilities were found to be mainly driven by anomalous winds associated with the ISOs. Similar to aerosol, dipolar signatures in the atmospheric aerosol radiative forcing (ARF) were also observed with clearer patterns. However, the forcing poles are not centered exactly where aerosol poles were observed, indicating the effect of differential properties of aerosols on the aerosol radiative forcing. Quantitatively, at the surface level, modulation in ARF is up to 3 Wm-2 (15%) for MJO and ER, and up to 2 Wm-2 (5%) for KE and MT; in the atmosphere and at the top of the atmosphere, modulation is up to 2 Wm-2 (15%) for MJO and ER, and up to 1 Wm-2 (5%) for KE and MT.
期刊介绍:
Atmospheric Pollution Research (APR) is an international journal designed for the publication of articles on air pollution. Papers should present novel experimental results, theory and modeling of air pollution on local, regional, or global scales. Areas covered are research on inorganic, organic, and persistent organic air pollutants, air quality monitoring, air quality management, atmospheric dispersion and transport, air-surface (soil, water, and vegetation) exchange of pollutants, dry and wet deposition, indoor air quality, exposure assessment, health effects, satellite measurements, natural emissions, atmospheric chemistry, greenhouse gases, and effects on climate change.