[NARCCAP-discuss] definition of specific humidity

[Ethan Bodnaruk]

Dear NARCCAP staff/users,

I am trying to figure out how to calculate the dewpoint from surface
specific humidity and other data (temp, pressure) but I see two conflicting
definitions of specific humidity:

1)  mass of water in air / dry mass of air

2)  mass of water in air / total mass of air

Which of these two definitions accurately describes the huss (surface
specific humidity) variable?

Thanks so much for your clarification!

Best,
Ethan

-- 
Ethan Bodnaruk
M.S. Nuclear Engineering
Ph.D. Student, Ecological Engineering
SUNY Environmental Science and Forestry
1 Forestry Drive
Syracuse, NY 13210