{"title":"探测气溶胶光学深度(AOD)局部热点区域:印度地区的时空特征","authors":"Ranjitkumar Solanki, K. N. Pathak","doi":"10.1007/s41810-023-00204-6","DOIUrl":null,"url":null,"abstract":"<div><p>India’s geographic and climatic characteristics make it a key region for the description of atmospheric aerosol optical properties around the globe. Spatiotemporal variations of Aerosol’s Optical Depth (AOD) are significant in understanding aerosols’ characteristics. The study’s primary focus is to show the variation of MODIS AOD along with the Dust Column mass density over the selected study regions. MODIS AOD at 550 nm of five major significant regions from India was selected using aerosol products from January 2001 to December 2020. To evaluate the optical properties of aerosols, satellite-based measurements offer greater geographical and temporal coverage due to the dearth of ground observations across the entirety of India, particularly over the Eastern region. The present study also compares dust column mass density obtained from the MERRA-2 database monthly averages for five major regions in India. Results show that the highest annual mean AOD is observed in the eastern Indian region (especially the IGB region), possibly due to air mass from the Thar desert. At the same time, values in other parts of the country are much lower. The eastern Indian region has indeed been identified as a local hot spot for aerosols, significantly affecting the local area’s air quality. Although, from April to August, the AOD levels are much more significant, when dust occurrences are more frequent throughout Southwest India, high AOD over the eastern Indian region is significantly associated with frequent dust outbursts throughout the year. Peak AOD (~ 0.6 to 0.7) values have been observed in other largely urbanized areas between mid-winter and mid-spring as a result of high aerosol emissions from fossil fuel burning coupled with thin atmospheric boundary-layer depths, which result in the development of a rigorous mass of aerosols near the surface. However, the AOD (~ 0.2) least observed from August to November shows a relatively higher value due to the MODIS algorithm not working correctly during the monsoon period. Average AOD over India shows increasing trends in 2016 (~ 1.2) for the eastern region and decreasing trends in 2003 (~ 0.2–0.4) throughout the study period.</p></div>","PeriodicalId":36991,"journal":{"name":"Aerosol Science and Engineering","volume":"8 1","pages":"44 - 53"},"PeriodicalIF":1.6000,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"To Detect Aerosols Optical Depth (AOD) Local Hotspot Region: Spatiotemporal Characteristics over Indian Regions\",\"authors\":\"Ranjitkumar Solanki, K. N. Pathak\",\"doi\":\"10.1007/s41810-023-00204-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>India’s geographic and climatic characteristics make it a key region for the description of atmospheric aerosol optical properties around the globe. Spatiotemporal variations of Aerosol’s Optical Depth (AOD) are significant in understanding aerosols’ characteristics. The study’s primary focus is to show the variation of MODIS AOD along with the Dust Column mass density over the selected study regions. MODIS AOD at 550 nm of five major significant regions from India was selected using aerosol products from January 2001 to December 2020. To evaluate the optical properties of aerosols, satellite-based measurements offer greater geographical and temporal coverage due to the dearth of ground observations across the entirety of India, particularly over the Eastern region. The present study also compares dust column mass density obtained from the MERRA-2 database monthly averages for five major regions in India. Results show that the highest annual mean AOD is observed in the eastern Indian region (especially the IGB region), possibly due to air mass from the Thar desert. At the same time, values in other parts of the country are much lower. The eastern Indian region has indeed been identified as a local hot spot for aerosols, significantly affecting the local area’s air quality. Although, from April to August, the AOD levels are much more significant, when dust occurrences are more frequent throughout Southwest India, high AOD over the eastern Indian region is significantly associated with frequent dust outbursts throughout the year. Peak AOD (~ 0.6 to 0.7) values have been observed in other largely urbanized areas between mid-winter and mid-spring as a result of high aerosol emissions from fossil fuel burning coupled with thin atmospheric boundary-layer depths, which result in the development of a rigorous mass of aerosols near the surface. However, the AOD (~ 0.2) least observed from August to November shows a relatively higher value due to the MODIS algorithm not working correctly during the monsoon period. Average AOD over India shows increasing trends in 2016 (~ 1.2) for the eastern region and decreasing trends in 2003 (~ 0.2–0.4) throughout the study period.</p></div>\",\"PeriodicalId\":36991,\"journal\":{\"name\":\"Aerosol Science and Engineering\",\"volume\":\"8 1\",\"pages\":\"44 - 53\"},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2023-12-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Aerosol Science and Engineering\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s41810-023-00204-6\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Aerosol Science and Engineering","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s41810-023-00204-6","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
To Detect Aerosols Optical Depth (AOD) Local Hotspot Region: Spatiotemporal Characteristics over Indian Regions
India’s geographic and climatic characteristics make it a key region for the description of atmospheric aerosol optical properties around the globe. Spatiotemporal variations of Aerosol’s Optical Depth (AOD) are significant in understanding aerosols’ characteristics. The study’s primary focus is to show the variation of MODIS AOD along with the Dust Column mass density over the selected study regions. MODIS AOD at 550 nm of five major significant regions from India was selected using aerosol products from January 2001 to December 2020. To evaluate the optical properties of aerosols, satellite-based measurements offer greater geographical and temporal coverage due to the dearth of ground observations across the entirety of India, particularly over the Eastern region. The present study also compares dust column mass density obtained from the MERRA-2 database monthly averages for five major regions in India. Results show that the highest annual mean AOD is observed in the eastern Indian region (especially the IGB region), possibly due to air mass from the Thar desert. At the same time, values in other parts of the country are much lower. The eastern Indian region has indeed been identified as a local hot spot for aerosols, significantly affecting the local area’s air quality. Although, from April to August, the AOD levels are much more significant, when dust occurrences are more frequent throughout Southwest India, high AOD over the eastern Indian region is significantly associated with frequent dust outbursts throughout the year. Peak AOD (~ 0.6 to 0.7) values have been observed in other largely urbanized areas between mid-winter and mid-spring as a result of high aerosol emissions from fossil fuel burning coupled with thin atmospheric boundary-layer depths, which result in the development of a rigorous mass of aerosols near the surface. However, the AOD (~ 0.2) least observed from August to November shows a relatively higher value due to the MODIS algorithm not working correctly during the monsoon period. Average AOD over India shows increasing trends in 2016 (~ 1.2) for the eastern region and decreasing trends in 2003 (~ 0.2–0.4) throughout the study period.
期刊介绍:
ASE is an international journal that publishes high-quality papers, communications, and discussion that advance aerosol science and engineering. Acceptable article forms include original research papers, review articles, letters, commentaries, news and views, research highlights, editorials, correspondence, and new-direction columns. ASE emphasizes the application of aerosol technology to both environmental and technical issues, and it provides a platform not only for basic research but also for industrial interests. We encourage scientists and researchers to submit papers that will advance our knowledge of aerosols and highlight new approaches for aerosol studies and new technologies for pollution control. ASE promotes cutting-edge studies of aerosol science and state-of-art instrumentation, but it is not limited to academic topics and instead aims to bridge the gap between basic science and industrial applications. ASE accepts papers covering a broad range of aerosol-related topics, including aerosol physical and chemical properties, composition, formation, transport and deposition, numerical simulation of air pollution incidents, chemical processes in the atmosphere, aerosol control technologies and industrial applications. In addition, ASE welcomes papers involving new and advanced methods and technologies that focus on aerosol pollution, sampling and analysis, including the invention and development of instrumentation, nanoparticle formation, nano technology, indoor and outdoor air quality monitoring, air pollution control, and air pollution remediation and feasibility assessments.