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Title: A Structure Function Model Recovers the Many Formulations for Air-Water Gas Transfer Velocity: Air-Water Gas Transfer

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1029/2018wr022731· OSTI ID:1539767

Abstract Two ideas regarding the structure of turbulence near a clear air‐water interface are used to derive a waterside gas transfer velocity k L for sparingly and slightly soluble gases. The first is that k L is proportional to the turnover velocity described by the vertical velocity structure function D w w ( r ), where r is separation distance between two points. The second is that the scalar exchange between the air‐water interface and the waterside turbulence can be suitably described by a length scale proportional to the Batchelor scale l B = η S c −1/2 , where S c is the molecular Schmidt number and η is the Kolmogorov microscale defining the smallest scale of turbulent eddies impacted by fluid viscosity. Using an approximate solution to the von Kármán‐Howarth equation predicting D w w ( r ) in the inertial and viscous regimes, prior formulations for k L are recovered including (i) , v K is the Kolmogorov velocity defined by the Reynolds number v K η / ν = 1 and ν is the kinematic viscosity of water; (ii) surface divergence formulations; (iii) , where u is the waterside friction velocity; (iv) for Keulegan numbers exceeding a threshold needed for long‐wave generation, where the proportionality constant varies with wave age, g is the gravitational acceleration; and (v) in free convection, where q o is the surface heat flux and β o is the thermal expansion of water. The work demonstrates that the aforementioned k L formulations can be recovered from a single structure function model derived for locally homogeneous and isotropic turbulence.

Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0006967; SC0011461; SC-0006967,DE-SC-0011461
OSTI ID:
1539767
Alternate ID(s):
OSTI ID: 1468370
Journal Information:
Water Resources Research, Vol. 54, Issue 9; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (2)

Gas exchange in streams and rivers journal October 2019
Mesoscale Temporal Wind Variability Biases Global Air–Sea Gas Transfer Velocity of CO2 and Other Slightly Soluble Gases journal March 2021