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- Title
Evidências da Estabilização do Nível do Mar no Brasil Entre os Anos 1864 e 2019.
- Authors
Paulo Faria, Antonio
- Abstract
Old photos showing rocks with barnacles and oysters lines were compared with recent photos in 18 areas of 5 Brazilian states (Espírito Santo, Rio de Janeiro, São Paulo, Paraná, and Santa Catarina). They suggest that the sea level in the region has been stable since 1864, at least. In 2017, 2018, and 2019, photos of the same rocks were taken, considering the original distance and angle, to compare to the old ones, made between the years 1864 and 1950. The calculations were made comparing the lethal line (LL) produced by the crustacean Balanus and the mollusks Crassostrea brasiliana and Crassostrea rhizophorae. The results show identical situation in 13 research areas, from 18 in total. In 5 areas it was not possible to compare due to the lower quality data. If the sea level is going up, the upper lines created by the barnacles and oysters should be higher in the 18 areas, because those creatures respond fast, they can repopulate the rock surface in four months, only. Nevertheless, visible changes in the lethal lines were not seen during the last 165 years. The conclusion suggests two possibilities: the first one is that the sea is at a level similar to the one in 1864, it made no change; the second one is that the regional crust is lifting up quick in the same rate of a supposed sea level change. However, it goes against the geological models because the region is situated on a stable tectonic area.
- Publication
Anuario do Instituto de Geociencias, 2020, Vol 43, Issue 2, p161
- ISSN
0101-9759
- Publication type
Academic Journal
- DOI
10.11137/2020_2_161_172