Record Details

Partial pressure of carbon dioxide (pCO2) and air-water CO2 exchange in the tropical semidiurnal estuarine system

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Partial pressure of carbon dioxide (pCO2) and air-water CO2 exchange in the tropical semidiurnal estuarine system
 
Creator Shanthi, R
Poornima, D
Saravanakumar, A
Thangaradjou, T
Choudhry, S B
Roy, R
 
Subject Air-water CO2 flux
Dissolved Inorganic Carbon (DIC)
Nutrients
pCO2
Total Alkalinity (TA)
Vellar estuary
 
Description 7-17
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 (pCO2) and air-water CO2
exchange. Lower and higher salinities revealed significant seasonality in estuarine pCO2, as well as variations in the
seasonal pattern due to the freshwater discharges during monsoon rainfall. The pCO2 attained the highest levels (8457 μatm)
during monsoon which coincided with the lowest pH (7.498) and the undersaturation of pCO2 (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 pCO2 distribution. Similarly, the multiple linear regression analysis showed significant influence of environmental
variables on pCO2 variability with a R2 of 0.957, SEE±230.816, p < 0.001. The surveyed area of the Vellar estuary had an
overall pCO2 of 1068 μatm and was supersaturated with regard to the atmospheric pCO2 throughout the year, with an
average CO2 flux of 4.13±5.59 mmol C m-2 d-1 to the atmosphere. During the study period, the Vellar estuary actively
supplied 650.2 mol C m-2 Y-1 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 CO2.
 
Date 2022-06-17T07:13:33Z
2022-06-17T07:13:33Z
2022-01
 
Type Article
 
Identifier 2582-6727 (Online); 2582-6506 (Print)
http://nopr.niscpr.res.in/handle/123456789/59895
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJMS Vol.51(01) [January 2022]