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<p>Partial pressure of carbon dioxide (<em>p</em>CO<sub>2</sub>) and air-water CO<sub>2</sub> exchange in the tropical semidiurnal estuarine system</p>

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Title Statement <p>Partial pressure of carbon dioxide (<em>p</em>CO<sub>2</sub>) and air-water CO<sub>2</sub> exchange in the tropical semidiurnal estuarine system</p>
 
Added Entry - Uncontrolled Name Shanthi, R ; CAS in Marine Biology Annamalai University
Poornima, D ; CAS in Marine Biology Annamalai University
Saravanakumar, A ; CAS in Marine Biology Annamalai University
Thangaradjou, T ; CAS in Marine Biology Annamalai University
Choudhry, S B ; National Remote Sensing Centre
Roy, R ; National Remote Sensing Centre
National Remote Sensing Centre
 
Uncontrolled Index Term Air-water CO2 flux, Dissolved Inorganic Carbon (DIC), Nutrients, pCO2, Total Alkalinity (TA), Vellar estuary
 
Summary, etc. <p style="text-align: justify;">Time-series observations of the Vellar estuary between May 2013 and December 2019 showed clear variability with respect to space and time in the distribution of nutrients, partial pressure of carbon dioxide (<em>p</em>CO<sub>2</sub>) and air-water CO<sub>2</sub> exchange. Lower and higher salinities revealed significant seasonality in estuarine <em>p</em>CO<sub>2</sub>, as well as variations in the seasonal pattern due to the freshwater discharges during monsoon rainfall. The <em>p</em>CO<sub>2</sub> attained the highest levels (8457 µatm) during monsoon which coincided with the lowest pH (7.498) and the undersaturation of <em>p</em>CO<sub>2</sub> (322 µatm) was observed with maximum pH (8.182) during pre-monsoon. The Principal Component Analysis (PCA) identified four components that accounted for 77.28 % of the total variance and explained the significant influence of nutrients, chlorophyll and temperature on <em>p</em>CO<sub>2</sub> distribution. Similarly, the multiple linear regression analysis showed significant influence of environmental variables on <em>p</em>CO<sub>2</sub> variability with a <em>R<sup>2</sup></em><sup> </sup>of 0.957, SEE±230.816, <em>p</em> &lt; 0.001. The surveyed area of the Vellar estuary had an overall<em> p</em>CO<sub>2</sub> of 1068 µatm and was supersaturated with regard to the atmospheric <em>p</em>CO<sub>2</sub> throughout the year, with an average CO<sub>2</sub> flux of 4.13±5.59 mmol C m<sup>-2 </sup>d<sup>-1</sup> to the atmosphere. During the study period, the Vellar estuary actively supplied 650.2 mol C m<sup>-2 </sup>Y<sup>-1</sup> to the atmosphere. Hence, the metabolic balance of the estuarine ecosystem is aided by land derived organic carbon accompanied with freshwater flows from the Vellar river, constituting the estuary as a substantial source of atmospheric CO<sub>2</sub>.</p>
 
Publication, Distribution, Etc. Indian Journal of Geo-Marine Sciences (IJMS)
2022-08-31 18:32:57
 
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http://op.niscair.res.in/index.php/IJMS/article/view/41726
 
Data Source Entry Indian Journal of Geo-Marine Sciences (IJMS); ##issue.vol## 51, ##issue.no## 01 (2022)
 
Language Note en