| Autor: |
Alencar AS; Universidade Veiga de Almeida, Departamento de Ciências Biológicas, Rua Ibituruna, 108, Maracanã, 20271-110 Rio de Janeiro, RJ, Brazil., Evangelista H; Universidade do Estado do Rio de Janeiro (UERJ), Laboratório de Radioecologia e Mudanças Globais (LARAMG), Rua São Francisco Xavier, 524, Pavilhão Haroldo Lisboa da Cunha, Subsolo, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil., Gonçalves SJ Jr; Universidade do Estado do Rio de Janeiro (UERJ), Laboratório de Radioecologia e Mudanças Globais (LARAMG), Rua São Francisco Xavier, 524, Pavilhão Haroldo Lisboa da Cunha, Subsolo, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil., Simões JC; Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de Geociências, Av. Bento Gonçalves, 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil.; University of Maine, Climate Change Institute, 16-40 Grove St Ext, Orono, ME, 4469-5790, USA., Felzenszwalb I; Universidade do Estado do Rio de Janeiro (UERJ), Laboratório de Mutagênese Ambiental, Departamento de Biofísica e Biometria (DBB), Av. Boulevard 28 de Setembro, 87, 4° andar, Vila Isabel, 20551-030 Rio de Janeiro, RJ, Brazil., Setzer A; Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 1758, Jardim da Granja, 12227-010 São José dos Campos, SP, Brazil., Passos HR; Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 1758, Jardim da Granja, 12227-010 São José dos Campos, SP, Brazil. |
| Abstrakt: |
The Antarctic Peninsula is undergoing rapid climate changes, impacting its surrounding marine ecosystem. At that site, sea ice plays a crucial role in this ecosystem by serving as a habitat for organisms and influencing primary productivity. Studying sea ice variability and primary productivity is essential for understanding environmental changes in Antarctica. This research focused on Joinville Island, located at the tip of the Antarctic Peninsula, where meteorological data and glaciochemical analysis were conducted on snow/firn cores for Cl-, Na+, Ca2+, Mg2+, SO4 2-, NO3 -, K+, MSA, NH4 + and F- to retrieve recent past environmental variabilities. The study revealed that Joinville Island experienced a net accumulation rate of 0.40 meters per year in water equivalent between 1993 and 2005. In snow/firn cores, Na+ correlated with both wind strength and sea ice extent (r=0.59 and r=0.66, respectively) while correlations were higher for MSA and Cl- with respect to sea ice (r=0.80 and r=0.74, respectively), considering both the Weddell and Amundsen-Bellingshausen sub-sectors. This analysis contributes to our understanding of sea ice dynamics and its influence on primary productivity in the area. |
