Showing papers by "University of Lapland published in 1993"

Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores

Abstract: THE direct-current electrical conductivity of glacial ice depends on its acidity1–3, and can also indicate changes in climate, as ice formed in cold, dusty periods has a high concentration of alkaline dust1,4,5, which significantly reduces the conductivity6,7 compared to warmer, less dusty periods. Here we present electrical conductivity records for the Greenland Ice Sheet Project 2 (GISP2) and Greenland Ice-core Project (GRIP) ice cores, drilled 28 km apart to enable direct comparison of the results. The upper parts of both records are consistent with previous evidence from other Greenland cores4,8–12 for a stable Greenland climate during the Holocene, and a series of warm events punctuating the last glacial period. However, there is a significant discrepancy between the two records in the bottom 10% of the cores, calling into question recent reports of climate variability in the last interglacial4,8 and the penultimate glaciation8. At this stage, it is too early to say what exactly is causing the discrepancy, although ice flow may have introduced some discontinuities into the records. Further work will be necessary to establish how much climatic information it will eventually be possible to extract from the lower parts of the two cores.

Bureaucracy and time consistency

Abstract: We construct a model that takes seriously the role of bureaucracy in the characterization of time-consistent policies. We argue that if the possibilities for governments to reduce the size of bureaucracy are limited, bureaucracy can be used as a means for influencing future governments. We show that the political process has implications for the size and growth of bureaucracy. Parties in power may hire bureaucrats of the opposite political color. This is a part of the time-consistent policy. Our model also gives an explanation for the growth of bureaucracy. This is a consequence of the time-consistent policies, i.e. policies that partially tie the hands of future governments. We also show that if public sector production is inefficient, the public sector will be too large in the long run. In the short run it may be too small.