{"title":"Retrieval of shape and orientation of multiple hydrometeor types from observations of scanning hybrid-mode Ka-band cloud radar","authors":"M. Hajipour, P. Seifert, A. Myagkov","doi":"10.1117/12.2597693","DOIUrl":"https://doi.org/10.1117/12.2597693","url":null,"abstract":"","PeriodicalId":412644,"journal":{"name":"Remote Sensing of Clouds and the Atmosphere XXVI","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129969092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Kassianov, Gabriel Gibler, E. Cromwell, Justin W. Monroe, L. Riihimaki, C. Flynn, J. Barnard, J. Michalsky, G. Hodges, Yan Shi, J. Comstock
Long-term records of aerosol optical depth (AOD) with high quality, suitable temporal continuity and spatial coverage are of immense interest to climate-related research activities. Both satellite- and ground-based measurements of AOD are typically provided by instruments with different designs, and distinct data acquisition and processing schemes. Thus, the corresponding AOD records likely have different accuracy, spatial coverage, and temporal resolution. Several studies have been focused on the synergy of multi-sensor satellite AOD products. Here we combine multi-year (1997-2018) AOD records available from four collocated ground-based instruments deployed at the mid-continental Southern Great Plains (SGP) Central Facility supported by the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program. We demonstrate how to minimize drawbacks (patchy spots) and to maintain benefits (high quality) of these records. Our demonstration finds a combined AOD obtained at two wavelengths (500 and 870 nm), with high temporal resolution (1-min), and provides the user with an estimate of the AOD uncertainty. Finally, we highlight expected applications of the merged dataset and its future extensions.
{"title":"Two Decades of Ground-based Multisensor AOD Measurements at US Continental Site: Acquisition and Merger","authors":"E. Kassianov, Gabriel Gibler, E. Cromwell, Justin W. Monroe, L. Riihimaki, C. Flynn, J. Barnard, J. Michalsky, G. Hodges, Yan Shi, J. Comstock","doi":"10.1117/12.2600587","DOIUrl":"https://doi.org/10.1117/12.2600587","url":null,"abstract":"Long-term records of aerosol optical depth (AOD) with high quality, suitable temporal continuity and spatial coverage are of immense interest to climate-related research activities. Both satellite- and ground-based measurements of AOD are typically provided by instruments with different designs, and distinct data acquisition and processing schemes. Thus, the corresponding AOD records likely have different accuracy, spatial coverage, and temporal resolution. Several studies have been focused on the synergy of multi-sensor satellite AOD products. Here we combine multi-year (1997-2018) AOD records available from four collocated ground-based instruments deployed at the mid-continental Southern Great Plains (SGP) Central Facility supported by the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program. We demonstrate how to minimize drawbacks (patchy spots) and to maintain benefits (high quality) of these records. Our demonstration finds a combined AOD obtained at two wavelengths (500 and 870 nm), with high temporal resolution (1-min), and provides the user with an estimate of the AOD uncertainty. Finally, we highlight expected applications of the merged dataset and its future extensions.","PeriodicalId":412644,"journal":{"name":"Remote Sensing of Clouds and the Atmosphere XXVI","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115116227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For many years, in-person SPIE Conferences stimulated active and fruitful discussions regarding the remote sensing, its impressive applications and future directions. This year, digital Conference takes place. Conference Chairs and SPIE Organizing Committee welcome all participates and their valuable contributions. These contributions will be highlighted by invited and contributed presentations during two live-stream sessions arranged on Monday and Tuesday. We encourage all speakers to give condensed talks and reserve time for short discussions. It is expected that total duration of talks and subsequent discussions will not exceed 15 minutes for invited presentations and 10 minutes for contributed presentations. Participants can virtually raise their hands to ask questions or submit them in Q and A box. Several factors, such as different time zones and technical issues associated with unacceptable connections, can represent challenges for the arranged live-stream sessions. Well, let us do our best to manage these sessions smoothly and include networking and live elements to our online meeting.
{"title":"Welcome and Introduction","authors":"E. Kassianov, A. Comerón, K. Schäfer","doi":"10.1117/12.2613746","DOIUrl":"https://doi.org/10.1117/12.2613746","url":null,"abstract":"For many years, in-person SPIE Conferences stimulated active and fruitful discussions regarding the remote sensing, its impressive applications and future directions. This year, digital Conference takes place. Conference Chairs and SPIE Organizing Committee welcome all participates and their valuable contributions. These contributions will be highlighted by invited and contributed presentations during two live-stream sessions arranged on Monday and Tuesday. We encourage all speakers to give condensed talks and reserve time for short discussions. It is expected that total duration of talks and subsequent discussions will not exceed 15 minutes for invited presentations and 10 minutes for contributed presentations. Participants can virtually raise their hands to ask questions or submit them in Q and A box. Several factors, such as different time zones and technical issues associated with unacceptable connections, can represent challenges for the arranged live-stream sessions. Well, let us do our best to manage these sessions smoothly and include networking and live elements to our online meeting.","PeriodicalId":412644,"journal":{"name":"Remote Sensing of Clouds and the Atmosphere XXVI","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124412143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The eruption begun after an intensive earthquake activity in the volcanic system of Reykjanes that opened up several kilometer long underground dike crossing the plate boundary of Reykjanes at an angle of around 22°. Quakes of varying intensity caused material damage in the township of Grindavik, the major population center in the neighborhood. The eruption came on March 20th, with put any clear warning, a magma eruption without much ash formation but when reaching the surface, the magma released gasses in a magnitude similar to other volcanic eruption of this type, e.g., Holuhraun (magma from Bardarbunga) 2014 and Surtsey 1963 - 1967. A characteristic SO2 emission in this eruption was measured 6kg/sec of SO2 from each m3 of magma or 2 o/ o o. This is similar to what was observed in the Holuhraun airborne observation campaign and corresponds very well to the estimates for Surtsey. The composition of the volcanic gas is similar too, the main constituent is water, often 90 - 55% of the total gas flow. The magma is 1200 - 1300 °C hot and comes from a very deep source about 20 km down. The possibility exists that the eruption goes on for a long time, widens the conduit and increases in output. An airborne measurement campaign was conducted in a light airplane, TF-VTR, by Dr. Gylfi Arnason, Reykjavik University (RU) with a mobile remote sensing DOAS instrumentation specially adapted for use in this airplane from the Duesseldorf University of Applied Sciences (HSD), Germany. This observation technology has been used with good results during volcanic events in Europe, Japan and America. Four sorties were carried out, measuring the column load of SO2 by flying under the plume in several traverses, each giving about 20 measurements of the SO2 column load. The results are compared to other measurement results from IMO (Icelandic Meteorological Institute) and UI (University of Iceland) and results from previous campaigns 2014 and 1963 - 67 and found similar. In the beginning the eruption output was steady at 5 m3/sec but was increasing in output magnitude and pulsating, making gas flux estimations more difficult. A steady plume in a steady wind follows the dispersion model developed by the authors, but the pulsating plume creates large puffs with high gas concentrations and increased hazards for nearby populations centers. Gas accumulation in a large clouds during calm weather, observed during the 2014 Holuhraun event, does also happen here and increases the risk of serious pollution events. This seriously hampers the possibility of using modeling results only to estimate gas pollution risks, and stresses the need for monitoring the gas flow by airborne measurements of the propagation of the plumes, puffs and accumulated clouds that may threaten the neighborhood.
{"title":"Airborne measurements of SO2 of the Fagradalsfjall eruption in Iceland with remote sensing","authors":"J. Elíasson, G. Árnason, K. Weber","doi":"10.1117/12.2608724","DOIUrl":"https://doi.org/10.1117/12.2608724","url":null,"abstract":"The eruption begun after an intensive earthquake activity in the volcanic system of Reykjanes that opened up several kilometer long underground dike crossing the plate boundary of Reykjanes at an angle of around 22°. Quakes of varying intensity caused material damage in the township of Grindavik, the major population center in the neighborhood. The eruption came on March 20th, with put any clear warning, a magma eruption without much ash formation but when reaching the surface, the magma released gasses in a magnitude similar to other volcanic eruption of this type, e.g., Holuhraun (magma from Bardarbunga) 2014 and Surtsey 1963 - 1967. A characteristic SO2 emission in this eruption was measured 6kg/sec of SO2 from each m3 of magma or 2 o/ o o. This is similar to what was observed in the Holuhraun airborne observation campaign and corresponds very well to the estimates for Surtsey. The composition of the volcanic gas is similar too, the main constituent is water, often 90 - 55% of the total gas flow. The magma is 1200 - 1300 °C hot and comes from a very deep source about 20 km down. The possibility exists that the eruption goes on for a long time, widens the conduit and increases in output. \u0000An airborne measurement campaign was conducted in a light airplane, TF-VTR, by Dr. Gylfi Arnason, Reykjavik University (RU) with a mobile remote sensing DOAS instrumentation specially adapted for use in this airplane from the Duesseldorf University of Applied Sciences (HSD), Germany. This observation technology has been used with good results during volcanic events in Europe, Japan and America. \u0000Four sorties were carried out, measuring the column load of SO2 by flying under the plume in several traverses, each giving about 20 measurements of the SO2 column load. The results are compared to other measurement results from IMO (Icelandic Meteorological Institute) and UI (University of Iceland) and results from previous campaigns 2014 and 1963 - 67 and found similar. In the beginning the eruption output was steady at 5 m3/sec but was increasing in output magnitude and pulsating, making gas flux estimations more difficult. A steady plume in a steady wind follows the dispersion model developed by the authors, but the pulsating plume creates large puffs with high gas concentrations and increased hazards for nearby populations centers. Gas accumulation in a large clouds during calm weather, observed during the 2014 Holuhraun event, does also happen here and increases the risk of serious pollution events. This seriously hampers the possibility of using modeling results only to estimate gas pollution risks, and stresses the need for monitoring the gas flow by airborne measurements of the propagation of the plumes, puffs and accumulated clouds that may threaten the neighborhood.","PeriodicalId":412644,"journal":{"name":"Remote Sensing of Clouds and the Atmosphere XXVI","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125599052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：