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  • 1
    Online Resource
    Online Resource
    Chemical reaction pathways affecting stratospheric and mesospheric ozone
    American Geophysical Union (AGU) ; 2006
    In:  Journal of Geophysical Research Vol. 111, No. D17 ( 2006)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 111, No. D17 ( 2006)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2004JD005713
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2006
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    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
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  • 2
    Online Resource
    Online Resource
    Future changes of the atmospheric composition and the impact of climate change
    Stockholm University Press ; 2001
    In:  Tellus B Vol. 53, No. 2 ( 2001-04), p. 103-121
    Details
    In: Tellus B, Stockholm University Press, Vol. 53, No. 2 ( 2001-04), p. 103-121
    Type of Medium: Online Resource
    ISSN: 0280-6509 , 1600-0889
    URL: Article
    DOI: 10.1034/j.1600-0889.2001.d01-10.x
    RVK:
    RA 1000
    RVK:
    UA 8382.2
    Language: English
    Publisher: Stockholm University Press
    Publication Date: 2001
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    The summer circulation over the eastern Mediterranean and the Middle East: influence of the South Asian monsoon
    Springer Science and Business Media LLC ; 2013
    In:  Climate Dynamics Vol. 40, No. 5-6 ( 2013-3), p. 1103-1123
    Details
    In: Climate Dynamics, Springer Science and Business Media LLC, Vol. 40, No. 5-6 ( 2013-3), p. 1103-1123
    Type of Medium: Online Resource
    ISSN: 0930-7575 , 1432-0894
    URL: Article
    DOI: 10.1007/s00382-012-1528-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2013
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  • 4
    Online Resource
    Online Resource
    Distribution of hydrogen peroxide over Europe during the BLUESKY aircraft campaign
    Copernicus GmbH ; 2022
    In:  Atmospheric Chemistry and Physics Vol. 22, No. 14 ( 2022-07-22), p. 9483-9497
    Details
    In: Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 22, No. 14 ( 2022-07-22), p. 9483-9497
    Abstract: Abstract. In this work we present airborne in situ trace gas observations of hydrogen peroxide (H2O2) and the sum of organic hydroperoxides over Europe during the Chemistry of the Atmosphere – Field Experiments in Europe (CAFE-EU, also known as BLUESKY) aircraft campaign using a wet chemical monitoring system, the HYdrogen Peroxide and Higher Organic Peroxide (HYPHOP) monitor. The campaign took place in May–June 2020 over central and southern Europe with two additional flights dedicated to the North Atlantic flight corridor. Airborne measurements were performed on the High Altitude and LOng-range (HALO) research operating out of Oberpfaffenhofen (southern Germany). We report average mixing ratios for H2O2 of 0.32 ± 0.25, 0.39 ± 0.23 and 0.38 ± 0.21 ppbv in the upper and middle troposphere and the boundary layer over Europe, respectively. Vertical profiles of measured H2O2 reveal a significant decrease, in particular above the boundary layer, contrary to previous observations, most likely due to cloud scavenging and subsequent rainout of soluble species. In general, the expected inverted C-shaped vertical trend with maximum hydrogen peroxide mixing ratios at 3–7 km was not found during BLUESKY. This deviates from observations during previous airborne studies over Europe, i.e., 1.64 ± 0.83 ppbv during the HOOVER campaign and 1.67 ± 0.97 ppbv during UTOPIHAN-ACT II/III. Simulations with the global chemistry–transport model EMAC partly reproduce the strong effect of rainout loss on the vertical profile of H2O2. A sensitivity study without H2O2 scavenging performed using EMAC confirms the strong influence of clouds and precipitation scavenging on hydrogen peroxide concentrations. Differences between model simulations and observations are most likely due to difficulties in the simulation of wet scavenging processes due to the limited model resolution.
    Type of Medium: Online Resource
    ISSN: 1680-7324
    URL: Article
    URL: Article
    DOI: 10.5194/acp-22-9483-2022
    DOI: 10.5194/acp-22-9483-2022-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    Atmospheric methane since the last glacial maximum was driven by wetland sources
    Copernicus GmbH ; 2023
    In:  Climate of the Past Vol. 19, No. 5 ( 2023-06-01), p. 1081-1099
    Details
    In: Climate of the Past, Copernicus GmbH, Vol. 19, No. 5 ( 2023-06-01), p. 1081-1099
    Abstract: Abstract. Atmospheric methane (CH4) has changed considerably in the time between the last glacial maximum (LGM) and the preindustrial (PI) periods. We investigate these changes in transient experiments with an Earth system model capable of simulating the global methane cycle interactively, focusing on the rapid changes during the deglaciation, especially pronounced in the Bølling–Allerød (BA) and Younger Dryas (YD) periods. We consider all relevant natural sources and sinks of methane and examine the drivers of changes in methane emissions as well as in the atmospheric lifetime of methane. We find that the evolution of atmospheric methane is largely driven by emissions from tropical wetlands, while variations in the methane atmospheric lifetime are small but not negligible. Our model reproduces most changes in atmospheric methane very well, with the exception of the mid-Holocene decrease in methane, although the timing of ice-sheet meltwater fluxes needs to be adjusted slightly in order to exactly reproduce the variations in the BA and YD.
    Type of Medium: Online Resource
    ISSN: 1814-9332
    URL: Article
    DOI: 10.5194/cp-19-1081-2023
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2023
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  • 6
    Online Resource
    Online Resource
    Aerosol water parameterization: long-term evaluation and importance for climate studies
    Copernicus GmbH ; 2018
    In:  Atmospheric Chemistry and Physics Vol. 18, No. 22 ( 2018-11-27), p. 16747-16774
    Details
    In: Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 18, No. 22 ( 2018-11-27), p. 16747-16774
    Abstract: Abstract. We scrutinize the importance of aerosol water for the aerosol optical depth (AOD) calculations using a long-term evaluation of the EQuilibrium Simplified Aerosol Model v4 for climate modeling. EQSAM4clim is based on a single solute coefficient approach that efficiently parameterizes hygroscopic growth, accounting for aerosol water uptake from the deliquescence relative humidity up to supersaturation. EQSAM4clim extends the single solute coefficient approach to treat water uptake of multicomponent mixtures. The gas–aerosol partitioning and the mixed-solution water uptake can be solved analytically, preventing the need for iterations, which is computationally efficient. EQSAM4clim has been implemented in the global chemistry climate model EMAC and compared to ISORROPIA II on climate timescales. Our global modeling results show that (I) our EMAC results of the AOD are comparable to modeling results that have been independently evaluated for the period 2000–2010, (II) the results of various aerosol properties of EQSAM4clim and ISORROPIA II are similar and in agreement with AERONET and EMEP observations for the period 2000–2013, and (III) the underlying assumptions on the aerosol water uptake limitations are important for derived AOD calculations. Sensitivity studies of different levels of chemical aging and associated water uptake show larger effects on AOD calculations for the year 2005 compared to the differences associated with the application of the two gas–liquid–solid partitioning schemes. Overall, our study demonstrates the importance of aerosol water for climate studies.
    Type of Medium: Online Resource
    ISSN: 1680-7324
    URL: Article
    URL: Article
    DOI: 10.5194/acp-18-16747-2018
    DOI: 10.5194/acp-18-16747-2018-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2018
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  • 7
    Online Resource
    Online Resource
    The 27-day solar rotational cycle in the Freie Universität Berlin Climate Middle Atmosphere Model with interactive chemistry (FUB CMAM CHEM)
    Elsevier BV ; 2010
    In:  Journal of Atmospheric and Solar-Terrestrial Physics Vol. 72, No. 9-10 ( 2010-6), p. 705-712
    Details
    In: Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier BV, Vol. 72, No. 9-10 ( 2010-6), p. 705-712
    Type of Medium: Online Resource
    ISSN: 1364-6826
    URL: Article
    DOI: 10.1016/j.jastp.2010.03.012
    RVK:
    UA 4547.8
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2010
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  • 8
    Online Resource
    Online Resource
    Future changes of the atmospheric composition and the impact of climate change
    Stockholm University Press ; 2001
    In:  Tellus B: Chemical and Physical Meteorology Vol. 53, No. 2 ( 2001-01-01), p. 103-
    Details
    In: Tellus B: Chemical and Physical Meteorology, Stockholm University Press, Vol. 53, No. 2 ( 2001-01-01), p. 103-
    Type of Medium: Online Resource
    ISSN: 1600-0889 , 0280-6509
    URL: Article
    DOI: 10.3402/tellusb.v53i2.16551
    RVK:
    RA 1000
    RVK:
    UA 8382.2
    Language: Unknown
    Publisher: Stockholm University Press
    Publication Date: 2001
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    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    The impact of greenhouse gases and halogenated species on future solar UV radiation doses
    American Geophysical Union (AGU) ; 2000
    In:  Geophysical Research Letters Vol. 27, No. 8 ( 2000-04-15), p. 1127-1130
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 27, No. 8 ( 2000-04-15), p. 1127-1130
    Abstract: The future development of stratospheric ozone layer depends on the concentration of chlorine and bromine containing species. The stratosphere is also expected to be affected by future enhanced concentrations of greenhouse gases. These result in a cooling of the winter polar stratosphere and to more stable polar vortices which leads to enhanced chemical depletion and reduced transport of ozone into high latitudes. One of the driving forces behind the interest in stratospheric ozone is the impact of ozone on solar UV‐B radiation. In this study UV scenarios have been constructed based on ozone predictions from the chemistry‐climate model runs carried out by GISS, UKMO and DLR. Since cloudiness, albedo and terrain height are also important factors, climatological values of these quantities are taken into account in the UV calculations. Relative to 1979–92 conditions, for the 2010–2020 time period the GISS model results indicate a springtime enhancement of erythemal UV doses of up to 90% in the 60–90 °N region and an enhancement of 100% in the 60–90 °S region. The corresponding maximum increases in the annual Northern Hemispheric UV doses are estimated to be 14% in 2010–20, and 2% in 2040–50. In the Southern Hemisphere 40% enhancement is expected during 2010–20 and 27% during 2040–50.
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/1999GL010886
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Atmospheric methane underestimated in future climate projections
    IOP Publishing ; 2021
    In:  Environmental Research Letters Vol. 16, No. 9 ( 2021-09-01), p. 094006-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 16, No. 9 ( 2021-09-01), p. 094006-
    Abstract: Methane (CH 4 ) is the second most important naturally occurring greenhouse gas (GHG) after carbon dioxide (Myhre G et al 2013 Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (Cambridge: Cambridge University Press) pp 659–740). For both GHGs, the present-day budget is dominated by anthropogenic emissions (Friedlingstein P et al 2019 Earth Syst. Sci. Data 11 1783–838; Saunois M et al 2020 Earth Syst. Sci. Data 12 1561–623). For CO 2 it is well established that the projected future rise in atmospheric concentration is near exclusively determined by anthropogenic emissions (Ciais P et al 2013 Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Inter-governmental Panel on Climate Change (Cambridge: Cambridge University Press) pp 465–570). For methane, this appears to be the common assumption, too, but whether this assumption is true has never been shown conclusively. Here, we investigate the evolution of atmospheric methane until 3000 CE under five Shared Socioeconomic Pathway (SSP) scenarios, for the first time using a methane-enabled state-of-the-art Earth System Model (ESM). We find that natural methane emissions, i.e. methane emissions from the biosphere, rise strongly as a reaction to climate warming, thus leading to atmospheric methane concentrations substantially higher than assumed in the scenarios used for CMIP6. We also find that the natural emissions become larger than the anthropogenic ones in most scenarios, showing that natural emissions cannot be neglected.
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/ac1814
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2255379-4
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