Estimating the Bowen ratio over the open and ice-covered ocean

• Main Authors: Andreas, Edgar L., Jordan, Rachel E., Mahrt, Larry, Vickers, Dean
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union
• Subjects: Sea ice
• Online Access: https://ir.library.oregonstate.edu/concern/articles/rv042z60m

The Bowen ratio, the ratio of the turbulent surface fluxes of sensible (Hₛ) and latent (Hₗ) heat, Bo ≡ Hₛ/Hₗ, occurs throughout micrometeorology. It finds application in the Bowen ratio and energy budget method, where it provides both turbulent heat fluxes when only the available energy at the surface is known. It can yield an estimate of a missing Hₛ or Hₗ if the other flux is known. We also suggest that the Bowen ratio may provide the missing piece needed to infer the surface sensible heat flux from satellite data. For this study, we analyze almost 9000 eddy-covariance measurements of Hₛ and Hₗ. About half were made over sea ice; the other half, over the open ocean. These are saturated surfaces where the surface specific humidity is the saturation value at the surface temperature. Surface temperatures ranged from -44°C to 32°C and predict the Bowen ratio through the Bowen ratio indicator, Bo* ¼ cₚ=/(Lᵥ∂Qₛₐₜ/∂ϴ|ϴₛ . Here cₚ is the specific heat of air at constant pressure, Lᵥ is the latent heat of sublimation or vaporization, and ∂Qₛₐₜ=∂ϴ is the derivative of the saturation specific humidity (Qₛₐₜ) with temperature (ϴ). All quantities are evaluated at the surface temperature, ϴₛ. Although Hₛ and Hₗ can occur in nine possible combinations, in our data set, three combinations represent over 90% of the cases: Hₛ>0 and Hₗ>0, Hₛ<0 and Hₗ<0, and Hₛ<0 and Hₗ>0. In each of these three cases, the data suggest Bo ¼ aBo*, where a is 0.40, 3.27, and -0.65, respectively. This is the publisher’s final pdf.