与非球形海盐有关的气溶胶去极化升高的机载HSRL-2测量

R. Ferrare, J. Hair, C. Hostetler, Taylor J. Shingler, S. Burton, M. Fenn, M. Clayton, A. Scarino, D. Harper, S. Seaman, A. Cook, E. Crosbie, E. Winstead, L. Ziemba, L. Thornhill, C. Robinson, R. Moore, M. Vaughan, A. Sorooshian, J. Schlosser, Hongyu Liu, Bo Zhang, G. Diskin, J. Digangi, J. Nowak, Yonghoon Choi, P. Zuidema, S. Chellappan
{"title":"与非球形海盐有关的气溶胶去极化升高的机载HSRL-2测量","authors":"R. Ferrare, J. Hair, C. Hostetler, Taylor J. Shingler, S. Burton, M. Fenn, M. Clayton, A. Scarino, D. Harper, S. Seaman, A. Cook, E. Crosbie, E. Winstead, L. Ziemba, L. Thornhill, C. Robinson, R. Moore, M. Vaughan, A. Sorooshian, J. Schlosser, Hongyu Liu, Bo Zhang, G. Diskin, J. Digangi, J. Nowak, Yonghoon Choi, P. Zuidema, S. Chellappan","doi":"10.3389/frsen.2023.1143944","DOIUrl":null,"url":null,"abstract":"Airborne NASA Langley Research Center (LaRC) High Spectral Resolution Lidar-2 (HSRL-2) measurements acquired during the recent NASA Earth Venture Suborbital-3 (EVS-3) Aerosol Cloud Meteorology Interactions over the Western Atlantic Experiment (ACTIVATE) revealed elevated particulate linear depolarization associated with aerosols within the marine boundary layer. These observations were acquired off the east coast of the United States during both winter and summer 2020 and 2021 when the HSRL-2 was deployed on the NASA LaRC King Air aircraft. During 20 of 63 total flight days, particularly on days with cold air outbreaks, linear particulate depolarization at 532 nm exceeded 0.15–0.20 within the lowest several hundred meters of the atmosphere, indicating that these particles were non-spherical. Higher values of linear depolarization typically were measured at 355 nm and lower values were measured at 1,064 nm. Several lines of evidence suggest that these non-spherical particles were sea salt including aerosol extinction/backscatter ratio (“lidar ratio”) values of 20–25 sr measured at both 355 and 532 nm by the HSRL-2, higher values of particulate depolarization measured at low (< 60%) relative humidity, coincident airborne in situ size and composition measurements, and aerosol transport simulations. The elevated aerosol depolarization values were not correlated with wind speed but were correlated with salt mass fraction and effective radius of the aerosol when the relative humidity was below 60%. HSRL-2 measured median particulate extinction values of about 20 Mm−1 at 532 nm associated with these non-spherical sea salt particles and found that the aerosol optical depth (AOD) contributed by these particles remained small (0.03–0.04) but represented on average about 30%–40% of the total column AOD. Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) spaceborne lidar aerosol measurements during several cold air outbreaks and CALIOP retrievals of column aerosol lidar ratio using column AOD constraints suggest that CALIOP operational aerosol algorithms can misclassify these aerosols as dusty marine rather than marine aerosols. Such misclassification leads to ∼40–50% overestimates in the assumed lidar ratio and in subsequent retrievals of aerosol optical depth and aerosol extinction.","PeriodicalId":198378,"journal":{"name":"Frontiers in Remote Sensing","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Airborne HSRL-2 measurements of elevated aerosol depolarization associated with non-spherical sea salt\",\"authors\":\"R. Ferrare, J. Hair, C. Hostetler, Taylor J. Shingler, S. Burton, M. Fenn, M. Clayton, A. Scarino, D. Harper, S. Seaman, A. Cook, E. Crosbie, E. Winstead, L. Ziemba, L. Thornhill, C. Robinson, R. Moore, M. Vaughan, A. Sorooshian, J. Schlosser, Hongyu Liu, Bo Zhang, G. Diskin, J. Digangi, J. Nowak, Yonghoon Choi, P. Zuidema, S. Chellappan\",\"doi\":\"10.3389/frsen.2023.1143944\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Airborne NASA Langley Research Center (LaRC) High Spectral Resolution Lidar-2 (HSRL-2) measurements acquired during the recent NASA Earth Venture Suborbital-3 (EVS-3) Aerosol Cloud Meteorology Interactions over the Western Atlantic Experiment (ACTIVATE) revealed elevated particulate linear depolarization associated with aerosols within the marine boundary layer. These observations were acquired off the east coast of the United States during both winter and summer 2020 and 2021 when the HSRL-2 was deployed on the NASA LaRC King Air aircraft. During 20 of 63 total flight days, particularly on days with cold air outbreaks, linear particulate depolarization at 532 nm exceeded 0.15–0.20 within the lowest several hundred meters of the atmosphere, indicating that these particles were non-spherical. Higher values of linear depolarization typically were measured at 355 nm and lower values were measured at 1,064 nm. Several lines of evidence suggest that these non-spherical particles were sea salt including aerosol extinction/backscatter ratio (“lidar ratio”) values of 20–25 sr measured at both 355 and 532 nm by the HSRL-2, higher values of particulate depolarization measured at low (< 60%) relative humidity, coincident airborne in situ size and composition measurements, and aerosol transport simulations. The elevated aerosol depolarization values were not correlated with wind speed but were correlated with salt mass fraction and effective radius of the aerosol when the relative humidity was below 60%. HSRL-2 measured median particulate extinction values of about 20 Mm−1 at 532 nm associated with these non-spherical sea salt particles and found that the aerosol optical depth (AOD) contributed by these particles remained small (0.03–0.04) but represented on average about 30%–40% of the total column AOD. Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) spaceborne lidar aerosol measurements during several cold air outbreaks and CALIOP retrievals of column aerosol lidar ratio using column AOD constraints suggest that CALIOP operational aerosol algorithms can misclassify these aerosols as dusty marine rather than marine aerosols. Such misclassification leads to ∼40–50% overestimates in the assumed lidar ratio and in subsequent retrievals of aerosol optical depth and aerosol extinction.\",\"PeriodicalId\":198378,\"journal\":{\"name\":\"Frontiers in Remote Sensing\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-04-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Frontiers in Remote Sensing\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.3389/frsen.2023.1143944\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers in Remote Sensing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3389/frsen.2023.1143944","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3

摘要

美国宇航局兰利研究中心(LaRC)高光谱分辨率激光雷达-2 (HSRL-2)在最近的美国宇航局地球冒险亚轨道-3 (ev -3)气溶胶云气象相互作用在西大西洋实验(ACTIVATE)中获得的测量结果显示,海洋边界层内的气溶胶与颗粒线性去极化升高有关。这些观测是在2020年冬季和夏季以及2021年在美国东海岸获得的,当时HSRL-2被部署在NASA LaRC King Air飞机上。在63个总飞行日中的20天,特别是在冷空气爆发的日子里,532 nm的线性颗粒去极化在大气最低几百米范围内超过0.15-0.20,表明这些颗粒是非球形的。通常在355 nm处测量到较高的线去极化值,而在1064 nm处测量到较低的线去极化值。一些证据表明这些非球形颗粒是海盐,包括HSRL-2在355和532 nm处测量到的气溶胶消光/后向散射比(“激光雷达比”)值为20-25 sr,低(< 60%)相对湿度下测量到的颗粒去极化值较高,同步的空气原位尺寸和成分测量,以及气溶胶运输模拟。相对湿度低于60%时,气溶胶去极化值升高与风速无关,而与气溶胶盐质量分数和有效半径相关。HSRL-2测量了这些非球形海盐颗粒在532 nm处的消光值中值约为20 Mm−1,发现这些颗粒贡献的气溶胶光学深度(AOD)仍然很小(0.03-0.04),但平均约占总柱AOD的30%-40%。基于正交偏振的云气溶胶激光雷达(CALIOP)在几次冷空气爆发期间的星载激光雷达气溶胶测量和CALIOP基于柱AOD约束的柱气溶胶激光雷达比检索结果表明,CALIOP操作气溶胶算法可能会将这些气溶胶错误地分类为海洋尘埃气溶胶,而不是海洋气溶胶。这种错误分类导致假设的激光雷达比和随后的气溶胶光学深度和气溶胶消光反演高估约40-50%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Airborne HSRL-2 measurements of elevated aerosol depolarization associated with non-spherical sea salt
Airborne NASA Langley Research Center (LaRC) High Spectral Resolution Lidar-2 (HSRL-2) measurements acquired during the recent NASA Earth Venture Suborbital-3 (EVS-3) Aerosol Cloud Meteorology Interactions over the Western Atlantic Experiment (ACTIVATE) revealed elevated particulate linear depolarization associated with aerosols within the marine boundary layer. These observations were acquired off the east coast of the United States during both winter and summer 2020 and 2021 when the HSRL-2 was deployed on the NASA LaRC King Air aircraft. During 20 of 63 total flight days, particularly on days with cold air outbreaks, linear particulate depolarization at 532 nm exceeded 0.15–0.20 within the lowest several hundred meters of the atmosphere, indicating that these particles were non-spherical. Higher values of linear depolarization typically were measured at 355 nm and lower values were measured at 1,064 nm. Several lines of evidence suggest that these non-spherical particles were sea salt including aerosol extinction/backscatter ratio (“lidar ratio”) values of 20–25 sr measured at both 355 and 532 nm by the HSRL-2, higher values of particulate depolarization measured at low (< 60%) relative humidity, coincident airborne in situ size and composition measurements, and aerosol transport simulations. The elevated aerosol depolarization values were not correlated with wind speed but were correlated with salt mass fraction and effective radius of the aerosol when the relative humidity was below 60%. HSRL-2 measured median particulate extinction values of about 20 Mm−1 at 532 nm associated with these non-spherical sea salt particles and found that the aerosol optical depth (AOD) contributed by these particles remained small (0.03–0.04) but represented on average about 30%–40% of the total column AOD. Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) spaceborne lidar aerosol measurements during several cold air outbreaks and CALIOP retrievals of column aerosol lidar ratio using column AOD constraints suggest that CALIOP operational aerosol algorithms can misclassify these aerosols as dusty marine rather than marine aerosols. Such misclassification leads to ∼40–50% overestimates in the assumed lidar ratio and in subsequent retrievals of aerosol optical depth and aerosol extinction.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信