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about aerosol modeling

hello everyone:
I have meet some problems about cam3.1 aerosol modeling
1:why the variable dustod_v don't have bigger value in east Asia(example desert in China), the value of East Asia is same as the sea(the value is only about 0.03), according to my understanding, the desert in china should have bigger value of variable dustod_v, But the result is not like this, what the reason of it?
2:I do modeling of black carbon aerosol, but radiative forcing of the top of atmosphere about BC(black carbon)have negative value near the tropic , For many research, this value should be positive, I don't know why it is.
3.If the value about top of atmosphere is same as top of model? If I want caculate radiative forcing of top of atmosphere, How should I caculate? because I found the output variable is mainly at top of model(example fsnt,flnt,fsntc...)
Please give me some suggestion, Thanks a lot.
 
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