TY - JOUR AU - Pérez, Fiz F. AU - Arístegui, Javier AU - Vázquez-Rodríguez, Marcos AU - Ríos, Aida F. PY - 2010/12/30 Y2 - 2024/03/29 TI - Anthropogenic CO2 in the Azores region JF - Scientia Marina JA - Sci. mar. VL - 74 IS - S1 SE - Articles DO - 10.3989/scimar.2010.74s1011 UR - https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1214 SP - 11-19 AB - The AZORES-I cruise was conducted in August 1998, spanning the length of three latitudinal large-scale sections at 22, 28 and 32ºW. The oceanic carbon system was oversampled by measuring total alkalinity, total inorganic carbon and pH. It is thus possible to estimate anthropogenic CO<sub>2</sub> (C<sub>ANT</sub>) and to investigate its relationship with the main water masses that are present. C C<sub>ANT</sub> is calculated using the latest back-calculation techniques: φC<sub>T</sub>º and TrOCA methods. Although the two approaches produce similar vertical distributions, the results of the TrOCA method show higher C<sub>ANT</sub> variability and produce higher inventories than those of the φC<sub>T</sub>º method. The large proportion of Mediterranean Water found in the northern part of the study area is the main cause of the observed increase northwards of C C<sub>ANT</sub> inventories. Changes in C C<sub>ANT</sub> inventories between 1981 and 2004 are evaluated using data from the TTO-NAS, OACES-93 and METEOR-60/5 cruises. According to the φC<sub>T</sub>º and TrOCA approaches, the average long-term rates of C C<sub>ANT</sub> inventory change are 1.32±0.11 mol C m<sup>-2</sup> y<sup>-1</sup> (P=0.008) and 1.18±0.16 mol C m<sup>-2</sup> y<sup>-1</sup> (P=0.018), respectively. During the 1993-1998 a significant increase in the C C<sub>ANT</sub> storage rate was detected by the φC<sub>T</sub>º method. It is thought that this stems directly from the enhanced Labrador Seawater formation after the increased advection observed at the time. ER -