Investigating the 8.2 ka event in northwestern Madagascar: Insight from data–model comparisons

The 8.2 ka event is a well-known cooling event in the Northern Hemisphere, but is poorly understood in Madagascar. Here, we compare paleoclimate data and outputs from paleoclimate simulations to better understand it. Records from Madagascar suggest two distinct sub-events (8.3 ka and 8.2 ka), that seem to correlate with records from northern high latitude. This could indicate causal relationships via changes in the Atlantic Meridional Overturning Circulation (AMOC) with changes in moisture source's δ18O, and changes in the mean position of the Inter-Tropical Convergence Zone (ITCZ), as climate modelling suggests. These two sub-events are also apparent in other terrestrial records, but the climatic signals are different. The prominent 8.2 ka sub-event records a clear antiphase relationship between the northern and southern hemisphere monsoons, whereas such relationship is less evident during the first 8.3 ka sub-event. Data–model comparison have also shown a mismatch between the paleoclimate data and the model outputs, the causes of which are more or less understood and may lie in the proxies, in the model, or in both data and model. Knowing that paleoclimate proxies and climate models produce different sets of variables, further research is needed to improve the data–model comparison approach, so that both paleoclimate data and paleoclimate models will better predict the likely climate status of a region during a specified time in the past with minimal uncertainties

Complements or Substitutes? A Microfoundations Perspective on the Interplay between Drivers of Ambidexterity in SMEs

Research on the microfoundations of ambidexterity has identified a number of drivers that shape the ability of individuals to overcome exploration-exploitation tensions. However, little is known about how these drivers interact and whether they act as complements or substitutes. In a two-stage survey of small and medium-sized enterprises, we find that formal structural drivers and informal contextual drivers of ambidexterity do not demonstrate complementarity, as generally assumed, but rather act at cross-purposes with each other. Furthermore, we find that behaviorally complex executives (those with the ability to think and act ambidextrously) appear to render the effects of the other two drivers relatively unimportant, and are only ever associated with moderate levels of ambidexterity. These findings permit the development of important theoretical insights for ambidexterity research from a microfoundations perspective

Managers’ Work Experience, Ambidexterity, and Performance: The Contingency Role of the Work Context

Scholars have suggested that we need a better understanding about the drivers and performance implications of managers’ ambidexterity. By building a human resource management perspective on managers’ ambidexterity, this article not only examines organizational and functional tenure as important antecedents, but also provides novel insights into the contextual conditions under which the ambidextrous behavior of managers contributes to individual performance. Based on survey research among managers of two large firms, our results indicate that while organizational tenure contributes to managers’ ambidextrous behavior, functional tenure actually limits such complex behavior. Our study also reveals how managers’ performance results from the interaction between their ambidextrous behavior and the uncertainty as well as the interdependence of their work context. Results indicate that managers’ ambidexterity contributes to individual performance in more uncertain and interdependent work contexts