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<div class="gmail_quote"><blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">hi!
<br />
<br />I am having model simulated vertical distribution of NO2 (from 994.600 hPa - 118.000
<br />hPa) over Indian Region. NO2 is in voiume mixing ratio. I want to calculate total
<br />column NO2 between 994.600 -
<br />228.250 hPa. I am using following steps in GRADS to calculate NO2 tropospheric amount
<br />in molecules per cm2. It is sowing values in the expected range. But, could you please
<br />tell whether I am doing correct or not?
<br />
<br />'define a=6.022e23/28.97' (where, 6.022e23 is Avogadro's Number, 28.97 is molecular
<br />mass of air)
<br />
<br />'set lev 994.6
<br />
<br />'define b=vint(lev,vmr_no2,228.250)/9.8'
<br />
<br />'define c=a*b'
<br />
<br />'d c'
<br />
<br />Thanks in advance
<br />
<br />Sachin Ghude
<br />
<div class="im">
<br />>
<br />> d no2(z=1) no2(z=2) ...
<br />> ?
<br />> If "no2" is mixing ratio then typically you have to multiply the integrand by rho dz
<br />= dp/g, where "dp" is the pressure thickness of each layer, g ~ 9.81.?
<br />>
<br />> ?? ?Arlindo
<br />>
<br />> --
<br />> Arlindo da Silva
<br />> <a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a>
<br /></div>
------- End of Original Message -------
<br />
<br />----------------------------------------------------------------------------------
<br />Dr. Sachin D. Ghude, Scientist(C)
<br />Indian Institute of Tropical Meteorology; <a href="http://www.tropmet.res.in/" target="_blank">www.tropmet.res.in</a>
<br />Physical Meteorology and Aerology Division, NCL, P.O., Pashan Rd., Pune-411 008
<br />Off. Ph. no. 91 20 25893600(Ext-350); Fax: 91 20 25893825
<br />Res 91 20 25899839 Mobile: 91 9373307978
<br />
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<div class="h5">
<br />---------- Original Message -----------
<br />From: Arlindo da Silva
<br />To: <a href="mailto:GRADSUSR@LIST.CINECA.IT">GRADSUSR@LIST.CINECA.IT</a>
<br />Sent: Wed, 1 Jul 2009 14:45:13 -0400
<br />Subject: Re: How to calculate total column
<br />
<br />> 2009/7/1 Libin Yan <<a href="mailto:zjuyanlibin@163.com">zjuyanlibin@163.com</a>>
<br />>
<br />
<br /></div>
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<br />
<br clear="all" />
<div></div>
<br />--
<br />Arlindo da Silva
<br /><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a>
<br />
<br /><b>------- End of Forwarded Message -------</b>
<br />
<br />
<br />----------------------------------------------------------------------------------
<br />Dr. Sachin D. Ghude, Scientist(C)
<br />Indian Institute of Tropical Meteorology; <a href="http://www.tropmet.res.in/" target="_blank">www.tropmet.res.in</a>
<br />Physical Meteorology and Aerology Division, NCL, P.O., Pashan Rd., Pune-411 008
<br />Off. Ph. no. +91 20 25893600(Ext-350); Fax: +91 20 25893825
<br />Res +91 20 25899839 Mobile:+91 9373307978
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