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Analysis of properties of the 19 February 2018 volcanic eruption of Mount Sinabung in S5P/TROPOMI and Himawari satellite data

de Laat, Adrianus and Vazquez-Navarro, Margarita and Theys, Nicolas and Stammes, Piet (2020) Analysis of properties of the 19 February 2018 volcanic eruption of Mount Sinabung in S5P/TROPOMI and Himawari satellite data. Natural Hazards and Earth System Sciences, 20, pp. 1203-1217. Copernicus Publications. DOI: 10.5194/nhess-20-1203-2020 ISSN 1561-8633

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Official URL: https://www.nat-hazards-earth-syst-sci.net/20/1203/2020/

Abstract

This study presents an analysis of TROPOMI cloud heights as a proxy for volcanic plume heights in the presence of absorbing aerosols and sulfur dioxide for the 19 February 2018 eruption plume of the Sinabung volcano on Sumatra, Indonesia. Comparison with CALIPSO satellite data shows that all three TROPOMI cloud height data products based on oxygen absorption which are considered here (FRESCO, ROCINN, O22CLD) provide volcanic ash cloud heights comparable to heights measured by CALIPSO for optically thick volcanic ash clouds. FRESCO and ROCINN heights are very similar, with the only differences for FRESCO cloud top heights above 14 km altitude. O22CLD cloud top heights unsurprisingly fall below those of FRESCO and ROCINN, as the O22CLD retrieval is less sensitive to cloud top heights above 10 km altitude. For optically thin volcanic ash clouds, i.e., when Earth's surface or clouds at lower altitudes shine through the volcanic ash cloud, retrieved heights fall below the volcanic ash cloud heights derived from CALIPSO data. Evaluation of corresponding Himawari-8 geostationary infrared (IR) brightness temperature differences ($\Delta$BTs) - a signature for detection of volcanic ash clouds in geostationary satellite data and widely used as input for quantitative volcanic ash cloud retrievals - reveals that for this particular eruption the $\Delta$BT volcanic ash signature changes to a $\Delta$BT ice crystal signature for the part of the ash plume reaching the upper troposphere beyond 10 km altitude several hours after the start of the eruption and which TROPOMI clearly characterizes as volcanic (SO2 > 1 DU - Dobson units - and AAI > 4 - absorbing aerosol index - or, more conservatively, SO2 > 10). The presence of ice in volcanic ash clouds is known to prevent the detection of volcanic ash clouds based on broadband geostationary satellite data. TROPOMI does not suffer from this effect and can provide valuable and accurate information about volcanic ash clouds and ash top heights in cases where commonly used geostationary IR measurements of volcanic ash clouds fail.

Item URL in elib:https://elib.dlr.de/131159/
Document Type:Article
Title:Analysis of properties of the 19 February 2018 volcanic eruption of Mount Sinabung in S5P/TROPOMI and Himawari satellite data
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
de Laat, AdrianusKNMIUNSPECIFIED
Vazquez-Navarro, MargaritaDLR, IPAUNSPECIFIED
Theys, NicolasBIRA-IASB, BUNSPECIFIED
Stammes, PietKNMIUNSPECIFIED
Date:4 May 2020
Journal or Publication Title:Natural Hazards and Earth System Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:20
DOI :10.5194/nhess-20-1203-2020
Page Range:pp. 1203-1217
Publisher:Copernicus Publications
ISSN:1561-8633
Status:Published
Keywords:Remote sensing, volcanic ash
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics
Deposited By: Bugliaro Goggia, Dr.rer.nat. Luca
Deposited On:22 Nov 2019 18:09
Last Modified:27 May 2020 16:03

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