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Carbonate system variability in the Gulf of Trieste (North Adriatic Sea)

机译：的里雅斯特湾（北亚得里亚海）碳酸盐岩系统的变异性

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摘要

The seasonal variability of the carbonate system in the waters of the Gulf of Trieste (GoT) was studied at PALOMA station from 2008 to 2009, in order to highlight the effects of biological processes, meteorological forcings and river loads on the dynamics of pH_T, CO_2 partial pressure (pCO_2), dissolved inorganic carbon (DIC), carbonate ion concentration (CO_3~=), aragonite saturation state (Ω_(Ar)) and total alkalinity (Ar). During winter, low seawater temperature (9.0 ± 0.4 ℃) and a weak biological activity (-10.7 < AOU < 15.7 μmol O_2 kg~(-1)) in a homogeneous water column led to the lowest average values of PCO_2 (328 ± 19 μatm) and Ω_(Ar) (2.91 ± 0.14). In summer, the water column in the area acted as a two-layer system, with production processes prevailing in the upper layer (average AOU = -29.3 μmol O_2 kg~(-1)) and respiration processes in the lower layer (average AOU = 26.8 μmol O_2 kg~(-1)). These conditions caused the decrease of DIC (50 μmol kg~(-1)) and the increase of Ω_(Ar) (1.0) values in the upper layer, whereas opposite trends were observed in the bottom waters. In August 2008, during a hypoxic event (dissolved oxygen DO = 86.9 μmol O_2 kg~(-1)), the intense remineralisation of organic carbon caused the rise of pCO_2 (1043 μatm) and the decreases of pH_T and Ω_(af) values down to 7.732 and 1.79 respectively. On an annual basis, surface pCO_2 was mainly regulated by the pronounced seasonal cycle of seawater temperature. In winter, surface waters in the GoT were under-saturated with respect to atmospheric CO_2, thus acting as a sink of CO_2, in particular when strong-wind events enhanced air-sea gas exchange (FCO2 up to -11.9 mmol m~(-2) d~(-1)). During summer, the temperature-driven increase of p(O_2 was dampened by biological CO_2 uptake, as consequence a slight over-saturation (pCO_2 = 409 uatm) turned out. River plumes were generally associated to higher A_T and PCO_2 values (up to 2859 umol kg"1 and 606 μatm respectively), but their effect was highly variable in space and time. During winter, the ambient conditions that favour the formation of dense waters on this continental shelf, also favour a high absorption of CO_2 in seawater and its consequent acidification (pHt decrease of -0.006 units during a 7-day Bora wind event). This finding indicates a high vulnerability of North Adriatic Dense Water to atmospheric CO_2 increase and ocean acidification process.
机译：为了强调生物过程，气象强迫和河流负荷对pH_T，CO_2动力学的影响，2008年至2009年在PALOMA站研究了的里雅斯特湾（GoT）水域碳酸盐系统的季节性变化。分压（pCO_2），溶解的无机碳（DIC），碳酸根离子浓度（CO_3〜=），文石饱和状态（Ω_（Ar））和总碱度（Ar）。在冬季，均质水柱中的海水温度低（9.0±0.4℃）和生物活性弱（-10.7

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第10期|51-62|共12页
  • 作者

    Carolina Cantoni; Anna Luchetta; Massimo Celio; Stefano Cozzi; Fabio Raicich; Giulio Catalano;

  • 作者单位

    CNR - National Research Council of Italy, ISMAR - Marine Sciences Institute in Trieste, Viale Romolo Cessi 2, 34123 Trieste, Italy;

    CNR - National Research Council of Italy, ISMAR - Marine Sciences Institute in Trieste, Viale Romolo Cessi 2, 34123 Trieste, Italy;

    Regional Environmental Protection Agency (ARPA) o/Friuli Venezia Giulia, Via Cairoli, 14, 33057 Palmanova (UD), Italy;

    CNR - National Research Council of Italy, ISMAR - Marine Sciences Institute in Trieste, Viale Romolo Cessi 2, 34123 Trieste, Italy;

    CNR - National Research Council of Italy, ISMAR - Marine Sciences Institute in Trieste, Viale Romolo Cessi 2, 34123 Trieste, Italy;

    CNR - National Research Council of Italy, ISMAR - Marine Sciences Institute in Trieste, Viale Romolo Cessi 2, 34123 Trieste, Italy;

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  • 正文语种 eng
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  • 关键词

    coastal waters; carbon dioxide; acidification; carbonate minerals; italy; north adriatic; gulf of trieste;

    机译：沿海水域;二氧化碳;酸化;碳酸盐矿物;意大利;北亚得里亚海里雅斯特湾;

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