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  • 1. Petoukhov, Vladimir
    et al.
    Petri, Stefan
    Kornhuber, Kai
    Thonicke, Kirsten
    Coumou, Dim
    Schellnhuber, Hans Joachim
    Stockholm University, Faculty of Science, Stockholm Resilience Centre. Potsdam Institute for Climate Impact Research (PIK), Germany.
    Alberta wildfire 2016: Apt contribution from anomalous planetary wave dynamics2018In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 12375Article in journal (Refereed)
    Abstract [en]

    In May-June 2016 the Canadian Province of Alberta suffered one of the most devastating wildfires in its history. Here we show that in mid-April to early May 2016 the large-scale circulation in the mid-and high troposphere of the middle and sub-polar latitudes of the northern hemisphere featured a persistent high-amplitude planetary wave structure dominated by the non-dimensional zonal wave number 4. The strongest anticyclonic wing of this structure was located over western Canada. In combination with a very strong El Nino event in winter 2015/2016 this favored highly anomalous, tinder-dry and high-temperature conditions at the surface in that area, entailing an increased fire hazard there. This critically contributed to the ignition of the Alberta Wildfire in May 2016, appearing to be the costliest disaster in Canadian history thus far.

  • 2. Scussolini, Paolo
    et al.
    Bakker, Pepijn
    Guo, Chuncheng
    Stepanek, Christian
    Zhang, Qiong
    Stockholm University, Faculty of Science, Department of Physical Geography.
    Braconnot, Pascale
    Cao, Jian
    Guarino, Maria-Vittoria
    Coumou, Dim
    Prange, Matthias
    Ward, Philip J.
    Renssen, Hans
    Kageyama, Masa
    Otto-Bliesner, Bette
    Aerts, Jeroen C. J. H.
    Agreement between reconstructed and modeled boreal precipitation of the Last Interglacial2019In: Science Advances, E-ISSN 2375-2548, Vol. 5, no 11, article id eaax7047Article in journal (Refereed)
    Abstract [en]

    The last extended time period when climate may have been warmer than today was during the Last Interglacial (LIG; ca. 129 to 120 thousand years ago). However, a global view of LIG precipitation is lacking. Here, seven new LIG climate models are compared to the first global database of proxies for LIG precipitation. In this way, models are assessed in their ability to capture important hydroclimatic processes during a different climate. The models can reproduce the proxy-based positive precipitation anomalies from the preindustrial period over much of the boreal continents. Over the Southern Hemisphere, proxy-model agreement is partial. In models, LIG boreal monsoons have 42% wider area than in the preindustrial and produce 55% more precipitation and 50% more extreme precipitation. Austral monsoons are weaker. The mechanisms behind these changes are consistent with stronger summer radiative forcing over boreal high latitudes and with the associated higher temperatures during the LIG.

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