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Atmospheric Chemistry and Physics Discussions
7094 Publications
collected from a compatible aggregator


  • Interannual variability of isotopic composition in water vapor over West Africa and its relation to ENSO

    A. Okazaki; Y. Satoh; G. Tremoy; F. Vimeux; R. Scheepmaker; K. Yoshimura (2014)
    This study was performed to examine the relationship between isotopic composition in near-surface vapor (δ18Ov) over West Africa during the monsoon season and El Niño–Southern Oscillation (ENSO) activity using the Isotope-incorporated Global Spectral Model. The model was evaluated using a satellite and in situ observations at intraseasonal to interannual timescales. The model provided an accurate simulation of the spatial pattern and seasonal and inter...

    Distinguishing the drivers of trends in land carbon fluxes and plant volatile emissions over the past three decades

    X. Yue; N. Unger; Y. Zheng (2015)
    The terrestrial biosphere has experienced dramatic changes in recent decades. Estimates of historical trends in land carbon fluxes remain uncertain because long-term observations are limited on the global scale. Here, we use the Yale Interactive terrestrial Biosphere (YIBs) model to estimate decadal trends in land carbon fluxes and emissions of biogenic volatile organic compounds (BVOCs) and to identify the key drivers for these changes during 1982–2011. Driven with hourly met...

    Extensive reduction of surface UV radiation since 1750 in world's populated regions

    M. M. Kvalevåg; G. Myhre; C. E. Lund Myhre (2009)
    Human activity influences a wide range of components that affect the surface UV radiation levels, among them ozone at high latitudes. We calculate the effect of human-induced changes in the surface erythemally weighted ultra-violet radiation (UV-E) since 1750. We compare results from a radiative transfer model to surface UV-E radiation for year 2000 derived by satellite observations (from Total Ozone Mapping Spectroradiometer) and to ground based measurements at 14 sites. The model correlates...

    Spatial distribution of &Delta;<sup>14</sup>CO<sub>2</sub> across Eurasia: measurements from the TROICA-8 expedition

    D. J. Mondeel; J. Elkins; S. Montzka; P. P. Tans; J. Southon; D. Hurst; S. J. Lehman; J. B. Miller; J. C. Turnbull; P. A. Romashkin; N. Elansky; A. Skorokhod (2008)
    Because fossil fuel derived CO2 is the only source of atmospheric CO2 that is devoid of 14C, atmospheric measurements of Δ14CO2 can be used to constrain fossil fuel emissions at local and regional scales. However, at the continental scale, atmospheric transport and other sources of variability in Δ14CO2 may influence the fossil fuel detection capability. We present a set of Δ14CO2 observations from the train-based TROICA-8 expedition across Eurasia in March–April 2004. Local...

    The evolution of shipping emissions and the costs of recent and forthcoming emission regulations in the northern European emission control area

    L. Johansson; J.-P. Jalkanen; J. Kalli; J. Kukkonen (2013)
    An extensive inventory of marine exhaust emissions is presented in the northern European emission control area (ECA) in 2009 and 2011. The emissions of SOx, NOx, CO2, CO and PM2.5 were evaluated using the Ship Traffic Emission Assessment Model (STEAM). We have combined the information on individual vessel characteristics and position reports generated by the Automatic Identification System (AIS). The emission limitations from 2009 to 2011 have had a significant impact on reducing the ...
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