The 2k Network


2k Network timeline
 Phase 1  Phase 2        Synthesis
 2008 - 2013 2014 2015 2016 May 2017



Research on the last 1 to 2 ka has resulted in several multi-proxy reconstructions of global or hemispheric temperature (e.g., Rutherford et al., 2005; Mann et al., 2007; 2008). In addition, first attempts have been made to reconstruct other climatic parameters, at a high spatial and temporal resolution (e.g., Luterbacher et al., 2004). Despite significant progress over the last few decades, we still do not sufficiently understand the precise sequence of changes related to regional climate forcings, internal variability, system feedbacks, and the responses of surface climate, land-cover, and bio- and hydro-sphere. Furthermore, at the decadal-to-centennial timescale we do not understand how sensitive the climate is to changes in solar activity, frequency of volcanic eruptions, greenhouse gas and aerosol concentration, and land cover.

It is understood that, at the continental- to regional-scale, climate is strongly modulated by internal variability, e.g., the NAO and Atlantic Multidecadal Oscillation (AMO) in the Atlantic area; and the El Niño Southern Oscillation (ENSO) and the Pacific Decadal Oscillations (PDO) in the Pacific area. However, the interactions of key processes at different temporal and spatial scales are not fully understood (Bengtsson et al., 2006).

Further, many parts of the globe lack adequate paleorecords for comparison with model simulations, and high-resolution (spatially and temporally) instrumental datasets are sparse. This is particularly true for the southern hemisphere and the tropics.

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This group is open to anyone who is interested, to participate visite the Phase 3 Projects page or contact Lucien von Gunten.

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2010:  Feb   Oct