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1
المؤلفون: Sheese, Patrick E., Walker, Kaley A., Boone, Chris D., Bourassa, Adam E., Degenstein, Doug A., Froidevaux, Lucien, McElroy, C. Thomas, Murtagh, Donal, 1959, Iii, James M. Russell, Zou, Jiansheng
المصدر: Atmospheric Measurement Techniques. 15(5):1233-1249
الوصف: For the past 17 years, the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) instrument on the Canadian SCISAT satellite has been measuring profiles of atmospheric ozone. The latest operational versions of the level 2 ozone data are versions 3.6 and 4.1. This study characterizes how both products compare with correlative data from other limb-sounding satellite instruments, namely MAESTRO, MLS, OSIRIS, SABER, and SMR. In general, v3.6, with respect to the other instruments, exhibits a smaller bias (which is on the order of similar to 3 %) in the middle stratosphere than v4.1 (similar to 2 %-9 %); however, the bias exhibited in the v4.1 data tends to be more stable, i.e. not changing significantly over time in any altitude region. In the lower stratosphere, v3.6 has a positive bias of about 3 %-5 % that is stable to within +/- 1 % per decade, and v4.1 has a bias on the order of -1 % to +5 % and is also stable to within +/- 1 % per decade. In the middle stratosphere, v3.6 has a positive bias of similar to 3 % with a significant negative drift on the order of 0.5 %-2.5 % per decade, and v4.1 has a positive bias of 2 %-9 % that is stable to within +/- 0.5 % per decade. In the upper stratosphere, v3.6 has a positive bias that increases with altitude up to similar to 16 % and a significant negative drift on the order of 2 %-3 % per decade, and v4.1 has a positive bias that increases with altitude up to similar to 15 % and is stable to within +/- 1 % per decade. Estimates indicate that both versions 3.6 and 4.1 have precision values on the order of 0.1-0.2 ppmv below 20 km and above 45 km (similar to 5 %-10 %, depending on altitude). Between 20 and 45 km, the estimated v3.6 precision of similar to 4 %-6 % is better than the estimated v4.1 precision of similar to 6 %-10 %.
وصف الملف: electronic
الوصول الحر: https://research.chalmers.se/publication/529210Test
https://research.chalmers.se/publication/529210/file/529210_Fulltext.pdfTest -
2
المؤلفون: Li, Anqi, 1990, Roth, Chris Z., Bourassa, Adam E., Degenstein, Douglas A., Perot, Kristell, 1985, Christensen, Ole Martin, 1984, Murtagh, Donal, 1959
المصدر: Mesospheric Transport Processes Earth System Science Data. 13(11):5115-5126
الوصف: The OH airglow has been used to investigate the chemistry and dynamics of the mesosphere and the lower thermosphere (MLT) for a long time. The infrared imager (IRI) aboard the Odin satellite has been recording the night-time 1.53 mu m OH (3-1) emission for more than 15 years (2001-2015), and we have recently processed the complete data set. The newly derived data products contain the volume emission rate profiles and the Gaussian-approximated layer height, thickness, peak intensity and zenith intensity, and their corresponding error estimates. In this study, we describe the retrieval steps for these data products. We also provide data screening recommendations. The monthly zonal averages depict the well-known annual oscillation and semi-annual oscillation signatures, which demonstrate the fidelity of the data set (https://doi.org/10.5281/zenodo.4746506Test, Li et al., 2021). The uniqueness of this Odin IRI OH long-term data set makes it valuable for studying various topics, for instance, the sudden stratospheric warming events in the polar regions and solar cycle influences on the MLT.
وصف الملف: electronic
الوصول الحر: https://research.chalmers.se/publication/527131Test
https://research.chalmers.se/publication/527116Test
https://research.chalmers.se/publication/527131/file/527131_Fulltext.pdfTest -
3
المؤلفون: Hegglin, Michaela I., Tegtmeier, Susann, Anderson, John, Bourassa, Adam E., Brohede, Samuel, Degenstein, Doug, Froidevaux, Lucien, Funke, Bernd, Gille, John, Kasai, Yasuko, Kyrola, Erkki T., Lumpe, Jerry, Murtagh, Donal, 1959, Neu, Jessica L., Perot, Kristell, 1985, Remsberg, Ellis E., Rozanov, Alexei, Toohey, Matthew, Urban, Joachim, 1964, von Clarmann, Thomas, Walker, Kaley A., Wang, Hsiang-Jui, Arosio, Carlo, Damadeo, Robert, Fuller, Ryan A., Lingenfelser, Gretchen, McLinden, Christopher, Pendlebury, Diane, Roth, Chris, Ryan, Niall J., Sioris, Christopher, Smith, Lesley, Weigel, Katja
المصدر: Earth System Science Data. 13(5):1855-1903
الوصف: The Stratosphere-troposphere Processes and their Role in Climate (SPARC) Data Initiative (SPARC, 2017) performed the first comprehensive assessment of currently available stratospheric composition measurements obtained from an international suite of space-based limb sounders. The initiative's main objectives were (1) to assess the state of data availability, (2) to compile time series of vertically resolved, zonal monthly mean trace gas and aerosol fields, and (3) to perform a detailed intercomparison of these time series, summarizing useful information and highlighting differences among datasets. The datasets extend over the region from the upper troposphere to the lower mesosphere (300-0.1 hPa) and are provided on a common latitude-pressure grid. They cover 26 different atmospheric constituents including the stratospheric trace gases of primary interest, ozone (O-3) and water vapor (H2O), major long-lived trace gases (SF6, N2O, HF, CCl3F, CCl2F2, NO y), trace gases with intermediate lifetimes (HCl, CH4, CO, HNO3), and shorter-lived trace gases important to stratospheric chemistry including nitrogen-containing species (NO, NO2, NOx, N2O5, HNO4), halogens (BrO, ClO, ClONO2, HOCl), and other minor species (OH, HO2, CH2O, CH3CN), and aerosol. This overview of the SPARC Data Initiative introduces the updated versions of the SPARC Data Initiative time series for the extended time period 1979-2018 and provides information on the satellite instruments included in the assessment: LIMS, SAGE I/II/III, HALOE, UARS-MLS, POAM II/III, OSIRIS, SMR, MIPAS, GOMOS, SCIAMACHY, ACE-FTS, ACEMAESTRO, Aura-MLS, HIRDLS, SMILES, and OMPS-LP. It describes the Data Initiative's top-down climatological validation approach to compare stratospheric composition measurements based on zonal monthly mean fields, which provides upper bounds to relative inter-instrument biases and an assessment of how well the instruments are able to capture geophysical features of the stratosphere. An update to previously published evaluations of O-3 and H2O monthly mean time series is provided. In addition, example trace gas evaluations of methane (CH4), carbon monoxide (CO), a set of nitrogen species (NO, NO2, and HNO3), the reactive nitrogen family (NOy), and hydroperoxyl (HO2) are presented. The results highlight the quality, strengths and weaknesses, and representativeness of the different datasets. As a summary, the current state of our knowledge of stratospheric composition and variability is provided based on the overall consistency between the datasets. As such, the SPARC Data Initiative datasets and evaluations can serve as an atlas or reference of stratospheric composition and variability during the "golden age" of atmospheric limb sounding. The updated SPARC Data Initiative zonal monthly mean time series for each instrument are publicly available and accessible via the Zenodo data archive (Hegglin et al., 2020).
وصف الملف: electronic
الوصول الحر: https://research.chalmers.se/publication/524406Test
https://research.chalmers.se/publication/524394Test
https://research.chalmers.se/publication/524406/file/524406_Fulltext.pdfTest -
4دورية أكاديمية
المؤلفون: Pohl, Christine, Wrana, Felix, Rozanov, Alexei, Deshler, Terry, Malinina, Elizaveta, Savigny, Christian, Rieger, Landon A., Bourassa, Adam E., Burrows, John P.
المصدر: eISSN: 1867-8548
الوصف: Stratospheric aerosols play a key role in atmospheric chemistry and climate. Their particle size is a crucial factor controlling the microphysical, radiative, and chemical aerosol processes in the stratosphere. Despite its importance, available observations on aerosol particle size are rather sparse. This limits our understanding and knowledge about the mechanisms and importance of chemical and climate aerosol feedbacks. The retrieval described by Malinina et al. (2018) provides the stratospheric particle size distribution (PSD) from SCIAMACHY limb observations in the tropics. This algorithm has now been improved and extended to work on the entire globe. Two PSD parameters of a unimodal lognormal PSD, the median radius and the geometric standard deviation, are retrieved between 18 and 35 km altitude from SCIAMACHY limb observations by a multi-wavelength non-linear regularized inversion. This assumes a fixed number density profile. The extinction coefficient and the effective radius are calculated. The effective Lambertian surface albedo pre-retrieved from coinciding SCIAMACHY nadir observations is integrated into the retrieval algorithm to mitigate the influence of the surface albedo on the retrieval results. The aerosol characteristics from SCIAMACHY are compared with in-situ balloon-borne measurements from Laramie, Wyoming, and retrievals from the satellite instruments SAGE II, SAGE III, and OSIRIS. In the northern hemisphere, the median radius differs by less than 27 % and the geometric standard deviation by less than 11 % from both balloon-borne and SAGE III data. Differences are mainly attributed to errors in the assumed a priori number density profile. Globally, the SCIAMACHY extinction coefficients at 750 nm deviate by less than 35 % from SAGE II, SAGE III, and OSIRIS data. The effective radius from SCIAMACHY, balloon-borne measurements, and SAGE III agree within about 18 % while the effective radius based on SAGE II measurements is systematically larger. The novel data set containing the effective radius ...
وصف الملف: application/pdf
الإتاحة: https://doi.org/10.5194/amt-2023-156Test
https://amt.copernicus.org/preprints/amt-2023-156Test/ -
5دورية أكاديمية
المساهمون: Swedish National Space Board
المصدر: Journal of Atmospheric and Solar-Terrestrial Physics ; volume 229, page 105831 ; ISSN 1364-6826
مصطلحات موضوعية: Space and Planetary Science, Atmospheric Science, Geophysics
الإتاحة: https://doi.org/10.1016/j.jastp.2022.105831Test
https://api.elsevier.com/content/article/PII:S1364682622000074?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S1364682622000074?httpAccept=text/plainTest -
6
المؤلفون: Berthet, Gwenaël, Jégou, Fabrice, Catoire, Valéry, Krysztofiak, Gisèle, Renard, Jean-Baptiste, Bourassa, Adam E., Degenstein, Doug A., Brogniez, Colette, Dorf, Marcel, Kreycy, Sebastian, Pfeilsticker, Klaus, Werner, Bodo, Lefèvre, Franck, Roberts, Tjarda J., Lurton, Thibaut, Vignelles, Damien, Bègue, Nelson, Bourgeois, Quentin, Daugeron, Daniel, Chartier, Michel, Robert, Claude, Gaubicher, Bertrand, Guimbaud, Christophe
المصدر: Atmospheric Chemistry And Physics. 17(3):2229-2253
الوصف: The major volcanic eruption of Mount Pinatubo in 1991 has been shown to have significant effects on stratospheric chemistry and ozone depletion even at midlatitudes. Since then, only moderate but recurrent volcanic eruptions have modulated the stratospheric aerosol loading and are assumed to be one cause for the reported increase in the global aerosol content over the past 15 years. This particularly enhanced aerosol context raises questions about the effects on stratospheric chemistry which depend on the latitude, altitude and season of injection. In this study, we focus on the midlatitude Sarychev volcano eruption in June 2009, which injected 0.9 Tg of sulfur dioxide (about 20 times less than Pinatubo) into a lower stratosphere mainly governed by high-stratospheric temperatures. Together with in situ measurements of aerosol amounts, we analyse high-resolution in situ and/or remote-sensing observations of NO2, HNO3 and BrO from balloon-borne infrared and UV-visible spectrometers launched in Sweden in August-September 2009. It is shown that differences between observations and three-dimensional (3-D) chemistry-transport model (CTM) outputs are not due to transport calculation issues but rather reflect the chemical impact of the volcanic plume below 19 km altitude. Good measurement-model agreement is obtained when the CTM is driven by volcanic aerosol loadings derived from in situ or space-borne data. As a result of enhanced N2O5 hydrolysis in the Sarychev volcanic aerosol conditions, the model calculates reductions of similar to 45% and increases of similar to 11% in NO2 and HNO3 amounts respectively over the August-September 2009 period. The decrease in NOx abundances is limited due to the expected saturation effect for high aerosol loadings. The links between the various chemical catalytic cycles involving chlorine, bromine, nitrogen and HOx compounds in the lower stratosphere are discussed. The increased BrO amounts (similar to 22 %) compare rather well with the balloon-borne observations when volcanic aerosol levels are accounted for in the CTM and appear to be mainly controlled by the coupling with nitrogen chemistry rather than by enhanced BrONO2 hydrolysis. We show that the chlorine partitioning is significantly controlled by enhanced BrONO2 hydrolysis. However, simulated effects of the Sarychev eruption on chlorine activation are very limited in the high-temperature conditions in the stratosphere in the period considered, inhibiting the effect of ClONO2 hydrolysis. As a consequence, the simulated chemical ozone loss due to the Sarychev aerosols is low with a reduction of -22 ppbv (-1.5 %) of the ozone budget around 16 km. This is at least 10 times lower than the maximum ozone depletion from chemical processes (up to -20 %) reported in the Northern Hemisphere lower stratosphere over the first year following the Pinatubo eruption. This study suggests that moderate volcanic eruptions have limited chemical effects when occurring at midlatitudes (restricted residence times) and outside winter periods (high-temperature conditions). However, it would be of interest to investigate longer-lasting tropical volcanic plumes or sulfur injections in the wintertime low-temperature conditions.
وصف الملف: print
الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-142508Test
https://doi.org/10.5194/acp-17-2229-2017Test -
7مؤتمر
المؤلفون: Khaykin, Sergey, Tencé, Florent, Feofilov, Artem, Laeng, Alexandra, Godin-Beekmann, Sophie, Hu, Qiaoyun, Goloub, Philippe, Veselovskii, Igor, Haeffelin, Martial, Rieger, Landon A, Bourassa, Adam E, Sakai, Tetsu, Nagai, Tomohiro, Morino, Isamu, Jin, Yoshitaka, Querel, Richard, Liley, Ben, Baron, Alexandre, Begue, Nelson, Duflot, Valentin, Bekki, Slimane
المساهمون: STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL), Institut für Meteorologie und Klimaforschung - Atmosphärische Spurengase und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT), Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Interactions Aérosols Rayonnement (IAR), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Site Instrumental de Recherche Par Télédétection Atmosphérique (SIRTA), Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), University of Saskatchewan Saskatoon, Canada (U of S), Meteorological Research Institute Tsukuba (MRI), Japan Meteorological Agency (JMA), National Institute for Environmental Studies (NIES), National Institute of Water and Atmospheric Research Lauder (NIWA), Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder -National Oceanic and Atmospheric Administration (NOAA)
المصدر: AGU23 (American Geophysical Union 2023) ; https://insu.hal.science/insu-04312965Test ; AGU23 (American Geophysical Union 2023), Dec 2023, San Francisco, United States
مصطلحات موضوعية: [SDU]Sciences of the Universe [physics]
جغرافية الموضوع: San Francisco, United States
الوصف: International audience ; The severity of wildfires has remarkably increased over the last years in both hemispheres and there is an emerging realization of their effect on climate and ozone layer. Intense wildfires release tremendous amounts of heat into the atmosphere, which gives rise to extreme thunderstorms termed Pyrocumulonimbus (PyroCb). These storms, augmented by the energy of combustion, can generate vigorous convective updrafts injecting smoke and other combustion products into the stratosphere, where the residence time of aerosols is not limited by cloud scavenging and precipitation. A number of recent studies have put in evidence that the effects of strong PyroCb events on the global stratosphere rival those of moderate volcanic eruptions in terms of magnitude and duration whilst exceeding them in terms of radiative forcing. Furthermore, the PyroCb injections into the stratosphere were shown to generate persistent synoptic-scale anticyclones (SCV – Smoke-Charged Vortex), lofting confined bubbles of combustion products and moisture deep into the stratosphere due to solar heating of carbonaceous aerosols, which prolongs their atmospheric residence time and radiative effects.Here we use global observations by MLS, OMPS, CALIPSO satellite missions together with ground-based lidar records in France (ATOLL, SIRTA, OHP, OPAR), Japan (Tsukuba) and New Zealand (Lauder) to characterize and quantify the planetary-scale impact of wildfire PyroCb on stratospheric gaseous composition (CO, CH3CN, HCN, H2O, O3) and aerosol optical properties as follows. First, we identify the PyroCb events during the last two decades with a measurable stratospheric impact and classify them into four categories ranging from 1 (e.g. Alberta 2023) to 4 (Australian Black Summer 2019/20) based on the magnitude and longevity of their stratospheric impact. Using a combination of nadir and limb observations along with ERA5 analysis, we explore the spatiotemporal evolution and dynamics of the smoke plumes. Then, we quantify the aerosol and ...
العلاقة: insu-04312965; https://insu.hal.science/insu-04312965Test
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8دورية أكاديمية
المؤلفون: Khaykin, Sergey, Legras, Bernard, Bucci, Silvia, Sellitto, Pasquale, Isaksen, Lars, Godin-Beekmann, Sophie, Tencé, Florent, Bekki, Slimane, Bourassa, Adam, E., Rieger, Landon, A., Zawada, Daniel, Jumelet, Julien
المساهمون: STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), European Centre for Medium-Range Weather Forecasts (ECMWF), University of Saskatchewan Saskatoon, Canada (U of S), ANR-17-CE01-0015,TTL-Xing,La Couche de la Tropopause Tropicale pendant la mousson d'Asie: transport et composition(2017)
المصدر: ISSN: 2662-4435 ; Communications Earth & Environment ; https://hal.science/hal-02865306Test ; Communications Earth & Environment, 2020, 1, pp.22. ⟨10.1038/s43247-020-00022-5⟩.
مصطلحات موضوعية: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
الوصف: International audience ; The Australian bushfires around the turn of the year 2020 generated an unprecedented perturbation of stratospheric composition, dynamical circulation and radiative balance. Here we show from satellite observations that the resulting planetary-scale blocking of solar radiation by the smoke is larger than any previously documented wildfires and of the same order as the radiative forcing produced by moderate volcanic eruptions. A striking effect of the solar heating of an intense smoke patch was the generation of a self-maintained anticyclonic vortex measuring 1000 km in diameter and featuring its own ozone hole. The highly stable vortex persisted in the stratosphere for over 13 weeks, travelled 66,000 km and lifted a confined bubble of smoke and moisture to 35 km altitude. Its evolution was tracked by several satellite-based sensors and was successfully resolved by the European Centre for Medium-Range Weather Forecasts operational system, primarily based on satellite data. Because wildfires are expected to increase in frequency and strength in a changing climate, we suggest that extraordinary events of this type may contribute significantly to the global stratospheric composition in the coming decades.
العلاقة: hal-02865306; https://hal.science/hal-02865306Test; https://hal.science/hal-02865306v3/documentTest; https://hal.science/hal-02865306v3/file/s43247-020-00022-5.pdfTest
الإتاحة: https://doi.org/10.1038/s43247-020-00022-5Test
https://hal.science/hal-02865306Test
https://hal.science/hal-02865306v3/documentTest
https://hal.science/hal-02865306v3/file/s43247-020-00022-5.pdfTest -
9دورية أكاديمية
المؤلفون: Bourassa, Adam E., Rieger, Landon A., Zawada, Daniel J., Khaykin, Sergey, Thomason, L. W., Degenstein, Doug A.
المساهمون: Institute of Space and Atmospheric Studies Saskatoon (ISAS), Department of Physics and Engineering Physics Saskatoon, University of Saskatchewan Saskatoon, Canada (U of S)-University of Saskatchewan Saskatoon, Canada (U of S), STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), NASA Langley Research Center Hampton (LaRC)
المصدر: ISSN: 2169-897X ; EISSN: 2169-8996.
مصطلحات موضوعية: aerosol, wildfire, stratosphere, satellite, limb, SAGE, OSIRIS, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
الوصف: International audience ; Intense forest fires in western North America during August 2017 caused smoke plumes that reached the stratosphere. While this phenomenon has often been observed, this particular event caused increases in stratospheric aerosol extinction at higher altitudes with greater magnitude than previously observed in the satellite record. Here we use multiple satellite limb sounding observations, which provide high sensitivity to thin aerosol layers and good vertical resolution, to show that enhancements in aerosol extinction from the fires reached as high as 23 km in altitude and persisted for more than 5 months. Within 1 month, the aerosol is observed to cover latitudes from 20°N to 60°N, which is essentially the northernmost limit of the observations. At midlatitudes between 15‐ and 20‐km altitudes, the sustained level of median aerosol extinction measured at 750 nm increased by almost an order of magnitude, from approximately 10−4 km−1 to nearly 10−3 km−1. Agreement between limb scatter and occultation measurements is generally within 20% despite potential bias due to modified aerosol shape and composition.
العلاقة: insu-03024972; https://insu.hal.science/insu-03024972Test; https://insu.hal.science/insu-03024972/documentTest; https://insu.hal.science/insu-03024972/file/2019JD030607.pdfTest
الإتاحة: https://doi.org/10.1029/2019JD030607Test
https://insu.hal.science/insu-03024972Test
https://insu.hal.science/insu-03024972/documentTest
https://insu.hal.science/insu-03024972/file/2019JD030607.pdfTest -
10دورية أكاديمية
المؤلفون: Bourassa, Adam E., Roth, Chris Z., Zawada, Daniel J., Rieger, Landon A., McLinden, Chris A., Degenstein, Douglas A.
المصدر: eISSN: 1867-8548
الوصف: A small long-term drift in the Optical Spectrograph and Infrared Imager System (OSIRIS) stratospheric ozone product, manifested mostly since 2012, is quantified and attributed to a changing bias in the limb pointing knowledge of the instrument. A correction to this pointing drift using a predictable shape in the measured limb radiance profile is implemented and applied within the OSIRIS retrieval algorithm. This new data product, version 5.10, displays substantially better both long- and short-term agreement with Microwave Limb Sounder (MLS) ozone throughout the stratosphere due to the pointing correction. Previously reported stratospheric ozone trends over the time period 1984–2013, which were derived by merging the altitude–number density ozone profile measurements from the Stratospheric Aerosol and Gas Experiment (SAGE) II satellite instrument (1984–2005) and from OSIRIS (2002–2013), are recalculated using the new OSIRIS version 5.10 product and extended to 2017. These results still show statistically significant positive trends throughout the upper stratosphere since 1997, but at weaker levels that are more closely in line with estimates from other data records.
وصف الملف: application/pdf
الإتاحة: https://doi.org/10.5194/amt-11-489-2018Test
https://amt.copernicus.org/articles/11/489/2018Test/
