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Moist Convective Downdraft Mass Flux

I am trying to use the downdraft mass flux associated with moist convection (thunderstorms, etc.) in a calculation within CAM. Currently, I am outputting the md variable from the convect_deep.F90..convect_deep_tend() routine at the surface only:

! Convert mass flux from reported mb/s to kg/m^2/s and
! output surface values only
dnmss_flx(:ncol) = md(:ncol,pver,lchnk) * 100./gravit

I am getting some strange output when I plot it globally. The global distribution does not correlate with PRECC (convective precip) output. Also, I noticed that there are positive and negative values for md. Since it is downdraft mass flux, shouldn't all values be of one sign (negative = down or positive = down)? Am I using the correct variable?

Thank you.
 
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