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Greg, we have found 139.6  in the average 15N/14N ratio of a  
stratospheric N2O sample and 186.2  in the 15N/14N of the terminal  
nitrogen atom (both vs. tropospheric N2O), see Atmos. Chem. Phys. 6,  
3535-3556. These measurements correspond to 146  and >200  vs. Air- 
N2. The sample was collected on 3 June 2003 over Kiruna at an altitude  
of 22.5 km. The N2O mixing ratio was 3.5 nmol/mol.

Jan


****************************************************************
Dr Jan Kaiser
School of Environmental Sciences
University of East Anglia
Norwich NR4 7TJ
United Kingdom
Tel. +44 (1603) 59-3393 (Office: 01.36)
Fax  +44 (1603) 59-1327

> I compiled d15N data from sedimentary rocks of all ages (from  
> Eoarchean t=
> o
> Quaternary) a few years ago in a paper published in Chemical Geology  
> (vol.
> 216 (2005) 37=9658).  It is probably incomplete for the more recent  
> sampl=
> es,
> but it should be a start.
>
> Dominic
>
>
> -------------------------------------------------
> Dominic Papineau  Ph.D.
> Geophysical Laboratory
> Carnegie Institution of Washington
> 5251 Broad Branch rd NW
> Washington DC 20015
>
> Office: 202-478-8908
> Cell: 303-514-8978
> -------------------------------------------------
>
>
>>> What are the highest reported d15N values in natural samples?
>>
>>
>>
>>
>> Greg Michalski, Assistant Professor
>> http://www.purdue.edu/eas/michalski/
>> Department of Earth and Atmospheric Sciences
>> Purdue University
>> 550 Stadium Mall Dr.
>> Lafayette IN.47907
>>