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Seasonal and diurnal changes of pCO2 in the lower Brahmaputra River, Bangladesh
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Seasonal and diurnal changes of pCO2 in the lower Brahmaputra River, Bangladesh
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Journal Article
Seasonal and diurnal changes of pCO2 in the lower Brahmaputra River, Bangladesh
2024
Overview
Monthly 24-h real-time high-resolution monitoring was conducted for 1 year to investigate the carbon dioxide (CO
2
) dynamics in the lower Brahmaputra River. The partial pressure of CO
2
(
p
CO
2
) was observed between 136 and 1213 µatm. The
p
CO
2
was almost 1.5 times higher during the wet season (May–October) than during the dry season (November–April). Diurnal variation in
p
CO
2
was pronounced during the dry season. In contrast, no clear diurnal pattern was observed during the wet season. The combined measurements of O
2
–CO
2
in river water provide insights into net chemical and microbial activity. In January and March, there was a bidirectional exchange of CO
2
, occurring from air to water (sink) and from water to air (source). However, in April, the CO
2
exchange was unidirectional, taking place solely from air to water, whereas in all other months, it occurred from water to air. The carbon dioxide flux (
F
CO
2
) in the river ranged from − 31.12 to 137.74 mmol m
−2
day
−1
, with an average of 25.26 mmol m
−2
day
−1
during the dry season and 78.56 mmol m
−2
day
−1
in the wet season. This flux significantly contributes to the regional net carbon budget of the world's largest delta.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
