Raghu,

The way H works is that IOPs like a and b must be in SI units of
1/meters. Normally chl is in mg Chl/m^3 and chl-specific spectra a* or
b* are in m^2/mg. Thus

a (1/m) = chl (mg/m^3) x a* (m2/mg)

Normally you read in a file with chl(depth) (if the concentration varies
with depth) and a*(wavelength) to get a(depth,wavelength). See page 46
of the HE5 Tech Doc for the file formats.

If you have chl in ppb/l then you would need to define a* in units of
liter/(ppb m) so that a = chl x a* has units of 1/m. I think I'd
convert ppb/l to mg/m^3 (= microgram/liter) and stick with the standard
way people measure chl, so as not to confuse things.

Likewise, CDOM is usually specified as the absorption at 440 nm (read
from a file, if not constant with depth), with the wavelength dependence
of a_CDOM at other wavelengths given by an exponential function, which
can be specified in the UI. See Tech Doc eq 7.

Curt

Raghavendra S. Mupparthy wrote:
>
>
> Hello All!
>
> I am newbie to HE5. I have hyperspectral radiometer data with chl
> profiles and CDOM concentration profiles in ppb/l. Now how can I
> specify CDOM's a() & b(), which the Case2 model seem to need as input?
> Do I need to estimate a & b from cdom concentration profile?
>
> Cheers
> Raghu
>
>

--
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