<i>p</i>CO<sub>2</sub> variability in the surface waters of the eastern Gulf of Cádiz (SW Iberian Peninsula)
<p>Spatio-temporal variations in the partial pressure of <span class="inline-formula">CO<sub>2</sub></span> (<span class="inline-formula"><i>p</i>CO<sub>2</sub></span>) were studied during eight oceanographic cruis...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-09-01
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| Series: | Ocean Science |
| Online Access: | https://www.ocean-sci.net/15/1225/2019/os-15-1225-2019.pdf |
| Summary: | <p>Spatio-temporal variations in the partial pressure of <span class="inline-formula">CO<sub>2</sub></span> (<span class="inline-formula"><i>p</i>CO<sub>2</sub></span>)
were studied during eight oceanographic cruises conducted between March 2014 and
February 2016 in surface waters of the eastern shelf of the Gulf of
Cádiz (SW Iberian Peninsula) between the Guadalquivir river and Cape
Trafalgar. <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> presents a range of variation between 320.6 and 513.6 <span class="inline-formula">µ</span>atm with highest values during summer and autumn and lowest during
spring and winter. For the whole study, <span class="inline-formula"><i>p</i>CO<sub>2</sub></span> shows a linear dependence
with temperature, and spatially there is a general decrease from coastal to
offshore stations associated with continental inputs and an increase in the
zones deeper than 400 m related to the influence of the eastward branch of
the Azores Current. The study area acts as a source of <span class="inline-formula">CO<sub>2</sub></span> to the
atmosphere during summer and autumn and as a sink in spring and winter with
a mean value for the study period of <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>-</mo><mn mathvariant="normal">0.18</mn><mo>±</mo><mn mathvariant="normal">1.32</mn></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="64pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="5a837c4537ee21191911cd1daefb6ae6"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="os-15-1225-2019-ie00001.svg" width="64pt" height="10pt" src="os-15-1225-2019-ie00001.png"/></svg:svg></span></span> mmol m<span class="inline-formula"><sup>−2</sup></span> d<span class="inline-formula"><sup>−1</sup></span>. In the Guadalquivir and Sancti Petri transects, the <span class="inline-formula">CO<sub>2</sub></span> fluxes decrease towards offshore, whereas in the Trafalgar transect fluxes
increase due to the presence of an upwelling. The annual uptake capacity of
<span class="inline-formula">CO<sub>2</sub></span> in the Gulf of Cádiz is 4.1 Gg C yr<span class="inline-formula"><sup>−1</sup></span>.</p> |
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| ISSN: | 1812-0784 1812-0792 |