Estimation of gas exchange rate and carbon dioxide gas flux at the sea-air interface

Chen Yuanrui; Zhao Dongliang; Lin Zikuan

doi:10.12284/hyxb2021128

Volume 43 Issue 9

Sep. 2021

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Chen Yuanrui，Zhao Dongliang，Lin Zikuan. Estimation of gas exchange rate and carbon dioxide gas flux at the sea-air interface[J]. Haiyang Xuebao，2021, 43(9)：8–20 doi: 10.12284/hyxb2021128

Citation:

Chen Yuanrui，Zhao Dongliang，Lin Zikuan. Estimation of gas exchange rate and carbon dioxide gas flux at the sea-air interface[J]. Haiyang Xuebao，2021, 43(9)：8–20 doi: 10.12284/hyxb2021128

Citation:

Chen Yuanrui，Zhao Dongliang，Lin Zikuan. Estimation of gas exchange rate and carbon dioxide gas flux at the sea-air interface[J]. Haiyang Xuebao，2021, 43(9)：8–20 doi: 10.12284/hyxb2021128

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Estimation of gas exchange rate and carbon dioxide gas flux at the sea-air interface

doi: 10.12284/hyxb2021128

College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China

Received Date: 2021-03-12
Rev Recd Date: 2021-04-19

Available Online: 2021-05-27

Publish Date: 2021-09-25

Abstract

Abstract

The CO₂ flux at the sea-air interface, which is equal to the product of the gas transfer velocity, solubility, and the CO₂ partial pressure difference between sea and the atmosphere, is estimated using the bulk equation, where the gas transfer velocity is usually associated with the wind speed. Different authors have proposed different parameterization schemes, in which the gas transfer velocity is a polynomial of different powers of the wind speed. In this paper, we summarize the main findings on the gas transfer velocity as a function of wind speed. We discover that the observation method has a greater influence on the gas transfer velocity than the power of the wind speed polynomial. On this basis, this paper calculates the global CO₂ flux from 1982−2018 using several different parametric formulas for the gas exchange rate. The ocean is a sink for atmospheric CO₂, the equatorial sea area is a source, and the ocean near 40° in the northern and southern hemispheres forms a strong absorption zone along the latitudinal direction. The annual average value of oceanic CO₂ absorption (in terms of carbon) over 1982−2018 is (−1.53±0.15)Pg/a. The oceanic absorption decreases year by year until 1999, reaching a minimum in 1999, after which the oceanic absorption begins to increase, with the increase in oceanic absorption occurring mainly in the Southern Ocean.
- gas transfer velocity,
- wind speed,
- carbon dioxide flux

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References(43)

References

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