Observation of volcanic ash from Puyehue–Cordón Caulle with IASI

Klüser, Lars; Erbertseder, Thilo; Meyer-Arnek, Julian

doi:10.5194/amt-6-35-2013

Cited by 61 publications

(71 citation statements)

References 49 publications

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“…The calculations also showed that 43 % of all air parcels reached the vicinity of Lauder, and the volcanic aerosol plume from the PCCVC eruption remained near the tropopause level in the mid-latitudes of the Southern Hemisphere. These results agree with the findings of Klüser et al (2013), who used backward trajectory calculations and observations of the Infrared Atmospheric Sounding Interferometer (IASI) on board the MetOp satellite to determine the evolution of the ash plume around the Southern Hemisphere.…”

Section: Comparisons Of Aerosol Vertical Profiles Before and After Thsupporting

confidence: 82%

“…In each ratio, we observed three peaks above the tropopause height in the analysis period: on 11 June, 23 June, and 4 July. This result suggests that the volcanic aerosol plume circled the Southern Hemisphere three times, a finding that was confirmed by using IASI, Ozone Monitoring Instrument (OMI), and Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data (not shown) (Klüser et al, 2013). To examine the three peaks of the aerosol vertical profiles in greater detail, we calculated the particle depolarization ratio δ p , to estimate the non-sphericity of the particles:…”

Section: Vertical Profiles Of the Backscattering Ratio And The Depolamentioning

confidence: 99%

“…This volcanic complex had previously erupted in May 1960 (Lara et al, 2004;Raga et al, 2013). The volcanic aerosol plumes traveled eastward from Chile via the prevailing westerlies and passed over New Zealand (Klüser et al, 2013). Because the Volcanic Ash Advisory Center (VAAC) in Wellington had forecast that a large volcanic aerosol plume would reach New Zealand, we performed continuous observations of volcanic aerosols with lidar at Lauder (45.04 • S, 169.68 • E), New Zealand, and provided the observational data to the VAAC for the safety of civil aviation.…”

Section: Introductionmentioning

confidence: 99%

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Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

et al. 2014

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Section: Comparisons Of Aerosol Vertical Profiles Before and After Thsupporting

confidence: 82%

Section: Vertical Profiles Of the Backscattering Ratio And The Depolamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

et al. 2014

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“…The eruption plume was observed by several nadir sounders measuring at ultraviolet (NASA Earth Observatory, 2013; NASA OMI, 2013), visible (NASA MODIS, 2013) and infrared wavelengths (Klüser et al, 2013). The nadir sounders traced the circulation of the volcanic ash around the Southern Hemisphere for more than 10 days.…”

Section: Volcanic Ash Detection Threshold Derived From Mipas Observatmentioning

confidence: 99%

Volcanic ash detection with infrared limb sounding: MIPAS observations and radiative transfer simulations

Grießbach¹,

Hoffmann²,

Spang³

et al. 2014

Atmos. Meas. Tech.

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Abstract. Small volcanic ash particles have long residence times in the troposphere and the stratosphere so that they have significant impact on the Earth's radiative budget and consequently affect climate. For global long-term observations of volcanic aerosol, infrared limb measurements provide excellent coverage, sensitivity to thin aerosol layers, and altitude information. The optical properties of volcanic ash and ice particles, derived from micro-physical properties, have opposing spectral gradients between 700 and 960 cm −1 for small particle sizes. Radiative transfer simulations that account for single scattering showed that the opposing spectral gradients directly transfer to infrared limb spectra. Indeed, we found the characteristic spectral signature, expected for volcanic ash, in measurements of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) after the eruption of the Chilean volcano Puyehue-Cordón Caulle in June 2011. From these measurements we derived an ash detection threshold function. The empirical ash detection threshold was confirmed in an extensive simulations study covering a wide range of atmospheric conditions, particle sizes and particle concentrations for ice, volcanic ash and sulfate aerosol. From the simulations we derived the upper detectable effective radius of 3.5 µm and the detectable extinction coefficient range of 5 × 10 −3 to 1 × 10 −1 km −1 . We also showed that this method is only sensitive to volcanic ash particles, but not to volcanic sulfate aerosol. This volcanic ash detection method for infrared limb measurements is a fast and reliable method and provides complementary information to existing satellite aerosol products.

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“…Several different approaches have been applied to the infrared spectra of different volcanic plumes, including methods based upon optimal estimation (Clarisse et al, 2010;Francis et al, L. J. Ventress et al: Retrieval of ash properties from IASI measurements 2012; Pavolonis et al, 2013a), singular value decomposition (Klüser et al, 2013), and a split window (Wen and Rose, 1994a;Prata and Grant, 2001). These methods have been applied to both hyperspectral and broadband satellite instruments, each of which has advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of ash properties from IASI measurements

et al. 2016

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Abstract. A new optimal estimation algorithm for the retrieval of volcanic ash properties has been developed for use with the Infrared Atmospheric Sounding Interferometer (IASI). The retrieval method uses the wave number range 680-1200 cm −1 , which contains window channels, the CO 2 ν 2 band (used for the height retrieval), and the O 3 ν 3 band.Assuming a single infinitely (geometrically) thin ash plume and combining this with the output from the radiative transfer model RTTOV, the retrieval algorithm produces the most probable values for the ash optical depth (AOD), particle effective radius, plume top height, and effective radiating temperature. A comprehensive uncertainty budget is obtained for each pixel. Improvements to the algorithm through the use of different measurement error covariance matrices are explored, comparing the results from a sensitivity study of the retrieval process using covariance matrices trained on either clear-sky or cloudy scenes. The result showed that, due to the smaller variance contained within it, the clear-sky covariance matrix is preferable. However, if the retrieval fails to pass the quality control tests, the cloudy covariance matrix is implemented.The retrieval algorithm is applied to scenes from the Eyjafjallajökull eruption in 2010, and the retrieved parameters are compared to ancillary data sources. The ash optical depth gives a root mean square error (RMSE) difference of 0.46 when compared to retrievals from the MODerate-resolution Imaging Spectroradiometer (MODIS) instrument for all pixels and an improved RMSE of 0.2 for low optical depths (AOD < 0.1). Measurements from the Facility for Airborne Atmospheric Measurements (FAAM) and Deutsches Zentrum für Luft-und Raumfahrt e.V. (DLR) flight campaigns are used to verify the retrieved particle effective radius, with the retrieved distribution of sizes for the scene showing excellent consistency. Further, the plume top altitudes are compared to derived cloud-top altitudes from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument and show agreement with RMSE values of less than 1 km.

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Observation of volcanic ash from Puyehue–Cordón Caulle with IASI

Cited by 61 publications

References 49 publications

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

Volcanic ash detection with infrared limb sounding: MIPAS observations and radiative transfer simulations

Retrieval of ash properties from IASI measurements

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