Seasonal shifts in diurnal variations of pCO2 and O2 in the lower Ganges River

Md Morshedul Haque; Most Shirina Begum; Omme K. Nayna; Shafi M. Tareq; Ji Hyung Park

doi:10.1002/lol2.10246

Seasonal shifts in diurnal variations of pCO₂ and O₂ in the lower Ganges River

Md Morshedul Haque, Most Shirina Begum, Omme K. Nayna, Shafi M. Tareq, Ji Hyung Park

Department of Environmental Science & Engineering

Research output: Contribution to journal › Letter › peer-review

10 Scopus citations

Abstract

High-frequency, paired measurements of the partial pressure of CO₂ (pCO₂) and dissolved O₂ were combined with dissolved organic matter (DOM) characterization to investigate diurnal (7:00–19:00) and seasonal variations in CO₂ dynamics in the lower Ganges River. Diurnal variations in pCO₂ shifted seasonally, concurring with changes in DOM optical properties, biodegradable DOM, and O₂ departures from atmospheric equilibrium (ΔO₂). Increased pCO₂ and CO₂ flux (FCO₂) in August–September corresponded to monsoonal floods carrying more terrestrial materials. Lower dry-season pCO₂ and FCO₂ concurred with higher ΔO₂, and exhibited strong relationships with DO and pH, indicating a dominant influence of phytoplankton production. Despite large variations in pCO₂, the year-long positive FCO₂ implied that the lower Ganges acted as a CO₂ source, reaching 122 mmol m⁻² d⁻¹. Increasing hydrologic variability and pollution in the Ganges Basin can amplify pCO₂ variations linked to seasonal shifts in terrestrial inputs and phytoplankton production.

Original language	English
Pages (from-to)	191-201
Number of pages	11
Journal	Limnology And Oceanography Letters
Volume	7
Issue number	3
DOIs	https://doi.org/10.1002/lol2.10246
State	Published - Jun 2022

Bibliographical note

Funding Information:
This work was supported by the Asia‐Pacific Network for Global Change Research (CRRP2016‐01MY‐Park) and the National Research Foundation of Korea funded by the Korean Government (NRF‐2017R1D1A1B06035179). We thank Nahin Mostofa Niloy for his help during fieldwork.

Funding Information:
This work was supported by the Asia-Pacific Network for Global Change Research (CRRP2016-01MY-Park) and the National Research Foundation of Korea funded by the Korean Government (NRF-2017R1D1A1B06035179). We thank Nahin Mostofa Niloy for his help during fieldwork.

Publisher Copyright:
© 2022 The Authors. Limnology and Oceanography Letters published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.

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10.1002/lol2.10246

Cite this

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title = "Seasonal shifts in diurnal variations of pCO2 and O2 in the lower Ganges River",

abstract = "High-frequency, paired measurements of the partial pressure of CO2 (pCO2) and dissolved O2 were combined with dissolved organic matter (DOM) characterization to investigate diurnal (7:00–19:00) and seasonal variations in CO2 dynamics in the lower Ganges River. Diurnal variations in pCO2 shifted seasonally, concurring with changes in DOM optical properties, biodegradable DOM, and O2 departures from atmospheric equilibrium (ΔO2). Increased pCO2 and CO2 flux (FCO2) in August–September corresponded to monsoonal floods carrying more terrestrial materials. Lower dry-season pCO2 and FCO2 concurred with higher ΔO2, and exhibited strong relationships with DO and pH, indicating a dominant influence of phytoplankton production. Despite large variations in pCO2, the year-long positive FCO2 implied that the lower Ganges acted as a CO2 source, reaching 122 mmol m−2 d−1. Increasing hydrologic variability and pollution in the Ganges Basin can amplify pCO2 variations linked to seasonal shifts in terrestrial inputs and phytoplankton production.",

author = "Haque, {Md Morshedul} and Begum, {Most Shirina} and Nayna, {Omme K.} and Tareq, {Shafi M.} and Park, {Ji Hyung}",

note = "Funding Information: This work was supported by the Asia‐Pacific Network for Global Change Research (CRRP2016‐01MY‐Park) and the National Research Foundation of Korea funded by the Korean Government (NRF‐2017R1D1A1B06035179). We thank Nahin Mostofa Niloy for his help during fieldwork. Funding Information: This work was supported by the Asia-Pacific Network for Global Change Research (CRRP2016-01MY-Park) and the National Research Foundation of Korea funded by the Korean Government (NRF-2017R1D1A1B06035179). We thank Nahin Mostofa Niloy for his help during fieldwork. Publisher Copyright: {\textcopyright} 2022 The Authors. Limnology and Oceanography Letters published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.",

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AU - Nayna, Omme K.

AU - Tareq, Shafi M.

AU - Park, Ji Hyung

N1 - Funding Information: This work was supported by the Asia‐Pacific Network for Global Change Research (CRRP2016‐01MY‐Park) and the National Research Foundation of Korea funded by the Korean Government (NRF‐2017R1D1A1B06035179). We thank Nahin Mostofa Niloy for his help during fieldwork. Funding Information: This work was supported by the Asia-Pacific Network for Global Change Research (CRRP2016-01MY-Park) and the National Research Foundation of Korea funded by the Korean Government (NRF-2017R1D1A1B06035179). We thank Nahin Mostofa Niloy for his help during fieldwork. Publisher Copyright: © 2022 The Authors. Limnology and Oceanography Letters published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.

PY - 2022/6

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N2 - High-frequency, paired measurements of the partial pressure of CO2 (pCO2) and dissolved O2 were combined with dissolved organic matter (DOM) characterization to investigate diurnal (7:00–19:00) and seasonal variations in CO2 dynamics in the lower Ganges River. Diurnal variations in pCO2 shifted seasonally, concurring with changes in DOM optical properties, biodegradable DOM, and O2 departures from atmospheric equilibrium (ΔO2). Increased pCO2 and CO2 flux (FCO2) in August–September corresponded to monsoonal floods carrying more terrestrial materials. Lower dry-season pCO2 and FCO2 concurred with higher ΔO2, and exhibited strong relationships with DO and pH, indicating a dominant influence of phytoplankton production. Despite large variations in pCO2, the year-long positive FCO2 implied that the lower Ganges acted as a CO2 source, reaching 122 mmol m−2 d−1. Increasing hydrologic variability and pollution in the Ganges Basin can amplify pCO2 variations linked to seasonal shifts in terrestrial inputs and phytoplankton production.

AB - High-frequency, paired measurements of the partial pressure of CO2 (pCO2) and dissolved O2 were combined with dissolved organic matter (DOM) characterization to investigate diurnal (7:00–19:00) and seasonal variations in CO2 dynamics in the lower Ganges River. Diurnal variations in pCO2 shifted seasonally, concurring with changes in DOM optical properties, biodegradable DOM, and O2 departures from atmospheric equilibrium (ΔO2). Increased pCO2 and CO2 flux (FCO2) in August–September corresponded to monsoonal floods carrying more terrestrial materials. Lower dry-season pCO2 and FCO2 concurred with higher ΔO2, and exhibited strong relationships with DO and pH, indicating a dominant influence of phytoplankton production. Despite large variations in pCO2, the year-long positive FCO2 implied that the lower Ganges acted as a CO2 source, reaching 122 mmol m−2 d−1. Increasing hydrologic variability and pollution in the Ganges Basin can amplify pCO2 variations linked to seasonal shifts in terrestrial inputs and phytoplankton production.

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