How to calculate total column

[Sachin Ghude]

hi!

I am having model simulated vertical distribution of NO2 (from 994.600 hPa - 118.000
hPa) over Indian Region. NO2 is in voiume mixing ratio. I want to calculate total
column NO2 between 994.600 -
228.250 hPa. I am using following steps in GRADS to calculate NO2 tropospheric amount
in molecules per cm2. It is sowing values in the expected range. But, could you please
tell whether I am doing correct or not?

'define a=6.022e23/28.97'  (where, 6.022e23 is Avogadro's Number, 28.97 is molecular
mass of air)

'set lev 994.6

'define b=vint(lev,vmr_no2,228.250)/9.8'

'define c=a*b'

'd c'

Thanks in advance

Sachin Ghude

>
> d no2(z=1) no2(z=2) ...
> ?
> If "no2" is mixing ratio then typically you have to multiply the integrand by rho dz
= dp/g, where "dp" is the pressure thickness of each layer, g ~ 9.81.?
>
> ?? ?Arlindo
>
> --
> Arlindo da Silva
> dasilva at alum.mit.edu

------- End of Original Message -------

----------------------------------------------------------------------------------
Dr. Sachin D. Ghude, Scientist(C)
Indian Institute of Tropical Meteorology; www.tropmet.res.in
Physical Meteorology and Aerology Division, NCL, P.O., Pashan Rd., Pune-411 008
Off. Ph. no. 91 20 25893600(Ext-350); Fax: 91 20 25893825
Res 91 20 25899839 Mobile: 91 9373307978

---------- Original Message -----------
From: Arlindo da Silva
To: GRADSUSR at LIST.CINECA.IT
Sent: Wed, 1 Jul 2009 14:45:13 -0400
Subject: Re: How to calculate total column

> 2009/7/1 Libin Yan <zjuyanlibin at 163.com>
>

--
Arlindo da Silva
dasilva at alum.mit.edu

------- End of Forwarded Message -------

----------------------------------------------------------------------------------
Dr. Sachin D. Ghude, Scientist(C)
Indian Institute of Tropical Meteorology; www.tropmet.res.in
Physical Meteorology and Aerology Division, NCL, P.O., Pashan Rd., Pune-411 008
Off. Ph. no. +91 20 25893600(Ext-350); Fax: +91 20 25893825
Res +91 20 25899839 Mobile:+91 9373307978

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