Testing the role of surface currents in latent heat flux calculation. |
Bulk latent heat flux is:
where S= sqrt(dws^2 + wg^2), and dws^2 = (u-us)^2 + (v-vs)^2 is the relative wind speed, and wg is a gustiness factor.
In Fig. 1, Latent heat flux is computed with 3 different estimates of surface currents (us, vs):
Fig. 1. top panel: "Flux" - "Fluxwcur", i.e. QE(w/Johnson et al. mean current) - QE(w/ ADCP);
This figure shows that your choice of surface velocities can make upto a 40 W/m2 difference in the latent heat flux, although more typical differences were less than 10 W/m2. The surface currents can induce a ~10 W/m2 seasonal cycle in the latent heat flux.
Meghan F. Cronin
Pacific Marine Environmental Laboratory
7600 Sand Point Way NE
Seattle, WA 98115 USA
Meghan Cronin's Home Page
DOC | NOAA | OAR | PMEL