scholarly journals Opportunistic validation of sulfur dioxide in the Sarychev Peak volcanic eruption cloud

2011 ◽  
Vol 4 (3) ◽  
pp. 3861-3875 ◽  
Author(s):  
S. A. Carn ◽  
T. M. Lopez
Keyword(s):  
Spatial Distribution ◽  
Sulfur Dioxide ◽  
Limited Data ◽  
Ozone Monitoring Instrument ◽  
Eruption Cloud ◽  
Kurile Islands ◽  
Volcanic Cloud ◽  
Ozone Monitoring ◽  
Lidar Observations ◽  
Sarychev Peak

Abstract. We report attempted validation of Ozone Monitoring Instrument (OMI) sulfur dioxide (SO2) retrievals in the stratospheric volcanic cloud from Sarychev Peak (Kurile Islands) in June 2009, through opportunistic deployment of a ground-based ultraviolet (UV) spectrometer (FLYSPEC) as the volcanic cloud drifted over Central Alaska. The volcanic cloud altitude (~12–14 km) was constrained using coincident CALIPSO lidar observations. By invoking some assumptions about the spatial distribution of SO2, we derive averages of FLYSPEC vertical SO2 columns for comparison with OMI SO2 measurements. Despite limited data, we find minimum OMI-FLYSPEC differences of ~5–6 % which support the validity of the operational OMI SO2 algorithm. These measurements represent the first attempt to validate SO2 in a stratospheric volcanic cloud using a mobile ground-based instrument, and demonstrate the need for a network of rapidly deployable instruments for validation of space-based volcanic SO2 measurements.

scholarly journals Opportunistic validation of sulfur dioxide in the Sarychev Peak volcanic eruption cloud

2011 ◽  
Vol 4 (9) ◽  
pp. 1705-1712 ◽  
Author(s):  
S. A. Carn ◽  
T. M. Lopez
Keyword(s):  
Sulfur Dioxide ◽  
Limited Data ◽  
Ozone Monitoring Instrument ◽  
Spatial And Temporal Scales ◽  
Eruption Cloud ◽  
Kurile Islands ◽  
Volcanic Cloud ◽  
Ozone Monitoring ◽  
Lidar Observations ◽  
Sarychev Peak

Abstract. We report attempted validation of Ozone Monitoring Instrument (OMI) sulfur dioxide (SO2) retrievals in the stratospheric volcanic cloud from Sarychev Peak (Kurile Islands) in June 2009, through opportunistic deployment of a ground-based ultraviolet (UV) spectrometer (FLYSPEC) as the volcanic cloud drifted over central Alaska. The volcanic cloud altitude (~12–14 km) was constrained using coincident CALIPSO lidar observations. By invoking some assumptions about the spatial distribution of SO2, we derive averages of FLYSPEC vertical SO2 columns for comparison with OMI SO2 measurements. Despite limited data, we find minimum OMI-FLYSPEC differences within measurement uncertainties, which support the validity of the operational OMI SO2 algorithm. However, our analysis also highlights the challenges involved in comparing datasets representing markedly different spatial and temporal scales. This effort represents the first attempt to validate SO2 in a stratospheric volcanic cloud using a mobile ground-based instrument, and demonstrates the need for a network of rapidly deployable instruments for validation of space-based volcanic SO2 measurements.

scholarly journals Evaluation of Redoubt Volcano's sulfur dioxide emissions by the Ozone Monitoring Instrument

2013 ◽  
Vol 259 ◽  
pp. 290-307 ◽  
Author(s):  
Taryn Lopez ◽  
Simon Carn ◽  
Cynthia Werner ◽  
David Fee ◽  
Peter Kelly ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Ozone Monitoring Instrument ◽  
Monitoring Instrument ◽  
Sulfur Dioxide Emissions ◽  
Ozone Monitoring

scholarly journals Extended observations of volcanic SO<sub>2</sub> and sulfate aerosol in the stratosphere

2007 ◽  
Vol 7 (1) ◽  
pp. 2857-2871 ◽  
Author(s):  
S. A. Carn ◽  
N. A. Krotkov ◽  
K. Yang ◽  
R. M. Hoff ◽  
A. J. Prata ◽  
...  
Keyword(s):  
Climate Change ◽  
Sulfur Dioxide ◽  
Satellite Data ◽  
Volcanic Eruptions ◽  
Sulfate Aerosol ◽  
Satellite Observations ◽  
Ozone Monitoring Instrument ◽  
Ozone Monitoring ◽  
Composition Structure ◽  
Stratospheric Composition

Abstract. Sulfate aerosol produced after injection of sulfur dioxide (SO2) into the stratosphere by volcanic eruptions can trigger climate change. We present new satellite data from the Ozone Monitoring Instrument (OMI) and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) missions that reveal the composition, structure and longevity of a stratospheric SO2 cloud and derived sulfate layer following a modest eruption (0.2 Tg total SO2) of Soufriere Hills volcano, Montserrat on 20 May 2006. The SO2 cloud alone was tracked for over 3 weeks and a distance of over 20 000 km; unprecedented for an eruption of this size. Derived sulfate aerosol at an altitude of ~20 km had circled the globe by 22 June and remained visible in CALIPSO data until at least 6 July. These synergistic NASA A-Train observations permit a new appreciation of the potential effects of frequent, small-to-moderate volcanic eruptions on stratospheric composition and climate.

scholarly journals Erythemal UV Dose Rate Spatial Distribution using Ozone Monitoring Instrument Satellite Data over Egypt

2018 ◽  
Vol 3 (10) ◽  
pp. 21-27
Author(s):  
Eman Fouad El-Nobi
Keyword(s):  
Spatial Distribution ◽  
Dose Rate ◽  
Linear Form ◽  
High Similarity ◽  
Ozone Monitoring Instrument ◽  
Monitoring Instrument ◽  
Contour Maps ◽  
Average Area ◽  
Ozone Monitoring ◽  
Uv Dose

The spatial distribution of Erythemal Ultraviolet Dose Rate (EUV) at noon in mW/m2 observations gotten from the Ozone Monitoring Instrument (OMI) are presented over Egypt covering the geographical domain (22.5°–31.5°N, 25.5°–35.5°E) during twelve  year from 2005 to 2016. With the end goal of mapping contour, with a spatial resolution of 1°×1° the results illustrated by monthly, seasonally and all period contour maps indicate high similarity of EUV in all years. Monthly correlation (R2) relationship between EUV and Latitude also estimated in simple linear form. High R2 was found in December and January (97%) were low one was found in July (53%). In the frame of the variability, Egypt was considered as an average area; the box-whisker plots were created for average monthly and annual values of EUV. The monthly mean of EUV values are lower in the winter months (December to February) 116.17±2.30 mW/m2 compared to those in the summer months (June to August) 282.36±2.87 mW/m2. The annual mean of EUV values are lower in 2015 (204.15±60.41 mW/m2) and higher in 2013 (213.13±60.34 mW/m2).

scholarly journals Corrections for OMI SO<sub>2</sub> BRD retrievals influenced by row anomalies

2012 ◽  
Vol 5 (11) ◽  
pp. 2635-2646 ◽  
Author(s):  
H. Yan ◽  
L. Chen ◽  
J. Tao ◽  
L. Su ◽  
J. Huang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Sulfur Dioxide ◽  
Ozone Monitoring Instrument ◽  
Latitude Range ◽  
Northern Latitudes ◽  
Residual Difference ◽  
Ozone Monitoring ◽  
Residual Correction ◽  
Radiance Data ◽  
Effective Reflectivity

Abstract. Since June 2007, the Ozone Monitoring Instrument (OMI) Earth radiance data at specific viewing angles have been affected by the row anomaly, which causes large biases in sulfur dioxide (SO2) columns retrieved using the band residual difference (BRD) algorithm. To improve global measurements of atmospheric SO2 from OMI, we developed two correction approaches for the row anomaly effects in the northern latitudes and along the full orbit. Firstly the residual correction approach with median residual from a sliding 10° latitude range, and with that near the Equator was used to remove the anomalous high SO2 columns in the northern latitudes. Secondly, in the case of the row anomaly along the full orbit, the SO2 biases caused by the anomalous ozone (O3) column and underestimated Lambertian effective reflectivity (LER) were reduced, respectively, by using unaffected adjacent O3 column and residual correction with median residual from a sliding 10° latitude range. Comparisons with the OMI SO2 columns processed with median residual from a sliding 30° latitude range have illustrated the drastic improvements of our correction approaches under row anomaly conditions. The consistencies among the SO2 columns inside and outside the row anomaly areas have also demonstrated the effectiveness of our correction approaches under row anomaly conditions. The analyses of the underestimation and the errors caused by the O3 column and LER were conducted to understand the limitations of our correction approaches. The proposed approaches for the row anomaly effects can extend the valid range of OMI SO2 Planetary Boundary Layer (PBL) data produced using the BRD algorithm.

scholarly journals WRF-Chem modeling of sulfur dioxide emissions from the 2008 Kasatochi Volcano

2015 ◽  
Vol 57 ◽  
Author(s):  
Sean David Egan ◽  
Martin Stuefer ◽  
Peter Webley ◽  
Catherine F. Cahill
Keyword(s):  
Remote Sensing ◽  
Sulfur Dioxide ◽  
North Pacific ◽  
Model Output ◽  
Ozone Monitoring Instrument ◽  
Sulfur Dioxide Emissions ◽  
Modeling Methods ◽  
The North ◽  
Ozone Monitoring ◽  
The North Pacific

We use the Weather Research Forecasting with Chemistry (WRF-Chem) model to simulate the evolution, dispersion and conversion of the sulfur dioxide (SO<sub>2</sub>) plume generated by the 2008 eruption of Kasatochi Volcano in Alaska, USA. About 1.7 Tg of SO<sub>2</sub> were dispersed into the atmosphere during three distinct explosive events. Stratospheric sulfur dioxide conversion chemistry is detailed and model output is compared to remote sensing retrievals from the Ozone Monitoring Instrument (OMI). WRF-Chem generated SO<sub>2</sub> column densities and plume locations similar to those from OMI retrievals as the plume traveled from the North Pacific through the continental United States and Canada. Analysis of SO<sub>2</sub> conversion established an eight day lifetime of SO<sub>2</sub> for the Kastaochi plume, which is a slightly shorter lifetime than derived by other modeling methods.

Measuring Sulfur Dioxide From Space: The Promise of Ozone Monitoring Instrument (OMI) on EOS-AURA Platform

2003 ◽  
Author(s):  
Arlin J. Krueger ◽  
Nickolay A. Krotkov ◽  
Saswati Datta ◽  
Dave Flittner ◽  
Oleg Dubovik ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Ozone Monitoring Instrument ◽  
Monitoring Instrument ◽  
Ozone Monitoring
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