Observed Ocean Bottom Temperature Variability at Four Sites in the Northwestern Argentine Basin: Evidence of Decadal Deep/Abyssal Warming Amidst Hourly to Interannual Variability During 2009-2019

Autor(es)

Meinen, Christopher S. ^[1] ; Perez, Renellys C. ^[1] ; Dong, Shenfu ^[1] ; Piola, Alberto R. ^{[2, 3, 4]} ; Campos, Edmo ^{[5, 6]}

Afiliação do(s) autor(es)

^[1] NOAA, Atlantic Oceanog & Meteorol Lab, Miami, FL 33149 - USA

^[2] Univ Buenos Aires, Buenos Aires, DF - Argentina

^[3] Serv Hidrog Naval, Buenos Aires, DF - Argentina

^[4] Consejo Nacl Invest Cient & Tecn, Inst Francoargentino Estudios Clima & Sus Impacto, Buenos Aires, DF - Argentina

^[5] Univ Sao Paulo, Oceanog Inst, Sao Paulo - Brazil

^[6] Amer Univ Shatjah, Sch Arts & Sci, Dept Biol Chem & Environm Sci, Sharjah - U Arab Emirates

• Tipo de documento: Artigo Científico
• Fonte: Geophysical Research Letters; v. 47, n. 18 SEP 28 2020.
• Citações Web of Science: 2

Resumo

Consecutive multiyear records of hourly ocean bottom temperature measurements are merged to produce new decade-long time series at four depths ranging from 1,360 to 4,757 m within the northwest Argentine Basin at 34.5 degrees S. Energetic temperature variations are found at a wide range of time scales. All sites exhibit fairly linear warming trends of approximately 0.02-0.04 degrees C per decade over the period 2009-2019, although the trends are only statistically different from zero at the two deepest sites at depths of similar to 4,500-4,800 m. Near-bottom temperatures from independent conductivity-temperature-depth profiles collected at these same locations every 6-24 months over the same decade show roughly consistent trends. Based on the distribution of spectral energies at the deepest sites and a Monte Carlo-style analysis, sampling at least once per year is necessary to capture the significant warming trends over this decade to within 50% error bars at a 95% confidence limit. (AU)

• Processo FAPESP: 11/50552-4 - Impacto do Atlântico Sul na célula de circulação meridional e no clima
• Beneficiário: Edmo José Dias Campos
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático