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| Titel |
Early Portuguese meteorological measurements (18th century) |
| VerfasserIn |
M. J. Alcoforado, J. M. Vaquero, R. M. Trigo, J. P. Taborda |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 1 ; Nr. 8, no. 1 (2012-02-29), S.353-371 |
| Datensatznummer |
250005378
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| Publikation (Nr.) |
 copernicus.org/cp-8-353-2012.pdf |
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| Zusammenfassung |
| Natural proxies, documentary evidence and instrumental data are the only
sources used to reconstruct past climates. In this paper, we present the
18th century meteorologists (either Portuguese or foreigners) who made the
first observations at several sites in Continental Portugal, Madeira Island
and Rio de Janeiro (Brazil), from 1749 until 1802. Information is given
concerning observation site, variables observed, measurement period, methods
of measurements and sources (both manuscript and printed). Some examples
from the data usefulness are given: rainfall variability in Madeira
(1749–1753) and in continental Portugal (1781–1793) was reconstructed,
allowing to extend towards the late 18th century the well known negative
correlation between the NAO index and seasonal rainfall. Furthermore,
previously unpublished data for 1783–1784 have allowed analysing the
consequences of the Lakagígar eruption in Portugal: foggy and haze days
are referred to in summer 1783, but unlike the hot summer observed in
northern and central Europe, temperatures in Portugal were lower than
average. Additionally, observations from Rio de Janeiro in Brazil show that
the Lakagígar consequences may well have spread to sectors of the
Southern Hemisphere. Although the series are short, the data have been used
for climate reconstruction studies and may also be useful to improve the
quality of large scale reconstruction datasets. |
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