Difference between revisions of "Chemistry Working Group"

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'''<big>Oxidants and Chemistry Working Group</big>'''
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All users interested in the GEOS-Chem chemistry scheme and associated processes (photolysis, heterogeneous, deposition) are encouraged to subscribe to the chemistry email list (click on the link in the [[#Contact information|contact information section]] below).
  
All users interested in the GEOS-Chem chemistry scheme and associated processe (photolysis, heterogenous, deposition) are encouraged to subscribe to the chemistry email list (click here for browser sign-up: https://lists.seas.harvard.edu/mailman/listinfo/geos-chem-oxidants).
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== Contact information ==
  
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{| border=1 cellspacing=0 cellpadding=5
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|-valign="top"
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!width="300px" bgcolor="#CCCCCC"|Oxidants and Chemistry Working Group Co-Chairs
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|width="600px"|
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*[http://www.barronh.com Barron Henderson] (GitHub: [https://github.com/barronh @barronh])
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*[http://hs.umt.edu/luhu/people.php Lu Hu] (GitHub: [https://github.com/luhu0 @luhu0])
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*[https://www.uaf.edu/chem/faculty/mao/ Jingqiu Mao] (Github: [https://github.com/jingqiumao @jingqiumao])
  
== Current GEOS-Chem Chemistry Issues (please add yours!) ==
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!bgcolor="#CCCCCC"|Oxidants and Chemistry Working Group email list
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|<tt>geos-chem-oxidants [at] g.harvard.edu</tt>
  
=== Isoprene chemistry ===
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|-valign="top"
I've created a page with some of the recent literature on isoprene chemistry. Please add more papers as they come along! ([[User:mje| MJE Leeds]])
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*Go to the [https://groups.google.com/a/g.harvard.edu/forum/#!forum/geos-chem-oxidants GEOS-Chem Oxidants and Chemistry]
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*Click on '''Subscribe to this group'''
  
[[isoprene]]
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=== HO2 + CH2O ===
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|}
Scheme does not contain the HO2 + CH2O --> Adduct reaction (MJE Leeds)
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Hermans, I., et al. (2005), Kinetics of alpha-hydroxy-alkylperoxyl radicals in oxidation
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--[[User:Bmy|Bob Y.]] ([[User talk:Bmy|talk]]) 18:29, 21 August 2015 (UTC)
processes. HO2 center dot-initiated oxidation of ketones/aldehydes near the tropopause,
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Journal of Physical Chemistry A, 109(19), 4303-4311.
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According to this paper, this reaction is significant when Temperature is below 220K.
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== Current GEOS-Chem Chemistry Projects (please add yours!) ==
 +
{| border=1 cellspacing=0 cellpadding=5
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|- bgcolor="#cccccc"
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!width="200px"|User Group
 +
!width="600px"|Description
 +
!width="150px"|Contact Person
 +
!width="100px"|Date Added
  
--[[User:Jmao|J Mao.]] 15:00, 10 Aug 2009 (EDT)
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|-valign="top"
 +
|NASA LARC
 +
|Scheme for higher PN production from aromatics, MEK, monoterpenes, glycolaldehyde, and 1,3-butadiene
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|[mailto:katherine.travis@nasa.gov Katherine R. Travis]
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|19 Sep 2023
  
=== near-IR photolysis of HNO4 ===
 
1. Since FastJX already takes this into account with cross section data at 574nm, we do not need to redo this in <tt>calcrate.f</tt>.  We can therefore comment out this entire IF block:
 
 
        !---------------------------------------------------------------------
 
        ! Prior to 10/27/09:
 
        ! FastJX has taken near-IR photolysis into account with
 
        ! cross section at 574nm, so we don't need to add 1e-5 anymore.
 
        ! According to Jimenez et al., "Quantum yields of OH, HO2 and
 
        ! NO3 in the UV photolysis of HO2NO2", PCCP, 2005, we also
 
        ! changed the branch ratio from 0.67(HO2)/0.33(OH) to 0.95/0.05
 
        ! This will put most weight of near-IR photolysis on HO2 channel.
 
        ! (jmao, bmy, 10/27/09)
 
        !
 
        !!==============================================================
 
        !! HARDWIRE addition of 1e-5 s-1 photolysis rate to
 
        !! HNO4 -> HO2+NO2 to account for HNO4 photolysis in near-IR --
 
        !! see Roehl et al. 'Photodissociation of peroxynitric acid in
 
        !! the near-IR', 2002. (amf, bmy, 1/7/02)
 
        !!
 
        !! Add NCS index to NKHNO4 for SMVGEAR II (gcc, bmy, 4/1/03)
 
        !!==============================================================
 
        !IF ( NKHNO4(NCS) > 0 ) THEN
 
        !
 
        !  ! Put J(HNO4) in correct spot for SMVGEAR II
 
        !  PHOTVAL = NKHNO4(NCS) - NRATES(NCS)
 
        !  NKN    = NKNPHOTRT(PHOTVAL,NCS)
 
        !
 
        !  DO KLOOP=1,KTLOOP
 
        !      RRATE(KLOOP,NKN)=RRATE(KLOOP,NKN) + 1d-5
 
        !  ENDDO
 
        !ENDIF
 
        !---------------------------------------------------------------------
 
  
 +
|-valign="top"
 +
|Columbia University
 +
|Automated model reduction isoprene oxidation mechanism
 +
|[mailto:benjamin.yang@columbia.edu Benjamin Yang]<br>
 +
[mailto:danielmw@ldeo.columbia.edu Dan Westervelt]
 +
|12 Sep 2023
  
2. We need to change the branch ratio of HNO4 photolysis in <tt>ratj.d</tt>. Change these lines from:
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|-valign="top"
 +
|NOAA CSL
 +
|JPL Kinetic Review Update/C-N balance/stoichiometry update
 +
|[mailto:khbates@ucdavis.edu Kelvin Bates]
 +
|01 Jul 2023
  
13 HNO4      PHOTON    OH        NO3                  0.00E+00  0.00    33.3  HO2NO2
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|-valign="top"
14 HNO4      PHOTON    HO2        NO2                  0.00E+00  0.00    66.7  HO2NO2
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|University of York
 +
|Nitrate Photolysis
 +
|[mailto:mat.evans@york.ac.ul Mat Evans]<br>
 +
[mailto:matthew.rowlinson@york.ac.ul Matthew Rowlinson]
 +
|08 Jun 2022
  
to:
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|-valign="top"
 +
|University of York
 +
|Halogen reverse reactions
 +
|[mailto:mat.evans@york.ac.ul Mat Evans]<br>
 +
[mailto:hansen.cao@york.ac.ul Hansen Cao]
 +
|01 Jun 2022
  
13 HNO4      PHOTON    OH        NO3                  0.00E+00  0.00      5.0  HO2NO2
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|-valign="top"
14 HNO4      PHOTON    HO2        NO2                  0.00E+00  0.00    95.0  HO2NO2
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|University of York
 +
|Chlorine chemistry
 +
|[mailto:mat.evans@york.ac.ul Mat Evans]<br>
 +
[mailto:al1916@york.ac.uk Amy Lees]
 +
|01 Oct 2022
  
This is based on Jimenez et al. (Quantum yields of OH, HO2 and NO3 in the UV photolysis of HO2NO2, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2005) shows that HO2 yield should be 0.95 and OH yield should be 0.05 for wavelength above 290nm.
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|-valign="top"
 +
|Harvard University and<br>MPIC-Mainz
 +
|Further development of [https://kpp.readthedocs.io The Kinetic PreProcessor (KPP)]
 +
|[mailto:yantosca@seas.harvard.edu Bob Yantosca] (GCST)
 +
|03 Jun 2022
 +
 
 +
|-valign="top"
 +
|Harvard University
 +
|Adding an adaptive solver capability into [https://kpp.readthedocs.io KPP]
 +
|[mailto:hplin@seas.harvard.edu Haipeng Lin]
 +
|03 Jun 2022
 +
 
 +
|-valign="top"
 +
|GCST
 +
|Migrating the Hg chemistry mechanism to [https://kpp.readthedocs.io KPP]
 +
|[mailto:yantosca@seas.harvard.eduard.edu Bob Yantosca] (GCST)
 +
|03 Jun 2022
 +
 
 +
|-valign="top"
 +
|GCST
 +
|Adding a CO-CO2-CH4-OCS chemistry mechanism with [https://kpp.readthedocs.io KPP]
 +
|[mailto:yantosca@seas.harvard.eduard.edu Bob Yantosca] (GCST)
 +
|03 Jun 2022
 +
 
 +
|-valign="top"
 +
|U Montana
 +
|Furans chemistry in MCM and in GEOS-Chem
 +
|[mailto:lixu.jin@umontana.edu Lixu Jin]<br>[mailto:lu.hu@mso.umt.edu Lu Hu]
 +
|21 May 2022
 +
 
 +
|-valign="top"
 +
|U Wollongong
 +
|Evaluation of aromatic oxidation products using new observational constraints
 +
|[mailto:smm997@uowmail.edu.au Stephen MacFarlane]
 +
|9 June 2022
 +
 
 +
|-valign="top"
 +
|UNSW, Sydney
 +
|Contribution of the unexplored photochemistry of aldehydes to the tropospheric levels of hydrogen
 +
|[mailto:m.perez_pena@unsw.edu.au Maria Paula Perez-Pena]
 +
|25 June 2021
 +
 
 +
|-valign="top"
 +
|University of California, Riverside
 +
|Updates to DMS oxidation scheme
 +
|[mailto:wporter@ucr.edu William Porter]
 +
|26 August 2020
 +
 
 +
|-valign="top"
 +
|Harvard University
 +
|Overhaul of cloud pH code including: use of Newton's method and addition of crustal cations and organic acids
 +
|[mailto:vshah@g.harvard.edu Viral Shah]<br>[mailto:jmoch@g.harvard.edu Jonathan Moch]
 +
|5 May 2019
 +
 
 +
|-valign="top"
 +
|U Alaska Fairbanks
 +
|Monoterpene oxidation and its impact on SOA formation
 +
|[mailto:yzheng4@alaska.edu Yiqi Zheng]<br>[mailto:jmao2@alaska.edu Jingqiu Mao]
 +
|21 April 2019
 +
 
 +
|-valign="top"
 +
|MIT
 +
|Simulating the global reactive carbon budget
 +
|[mailto:sarahsaf@mit.edu Sarah Safieddine]
 +
|12 April 2017
 +
 
 +
|-valign="top"
 +
| FSU
 +
|Stratosphere-troposphere coupling, improvements to UCX & H2 chemistry
 +
|[mailto:cdholmes@fsu.edu Chris Holmes]
 +
|May 2017
 +
 
 +
|-valign="top"
 +
|FSU
 +
|Methane and methyl chloroform lifetimes
 +
|[mailto:cdholmes@fsu.edu Chris Holmes]
 +
|May 2017
 +
 
 +
|-valign="top"
 +
|FSU
 +
|Arctic halogen & ozone chemistry
 +
|[mailto:cdholmes@fsu.edu Chris Holmes]
 +
|May 2017
 +
|}
 +
 
 +
== Current GEOS-Chem Chemistry Issues (please add yours!) ==
  
This way all the near-IR photolysis will have most weight on HO2 channel(Stark et al., Overtone dissociation of peroxynitric acid (HO2NO2): Absorption cross sections and photolysis products, JOURNAL OF PHYSICAL CHEMISTRY A, 2008).
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=== Carbon balance ===
  
--[[User:Jmao|J Mao.]] 11:00, 26 Oct 2009 (EDT)
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==== Script for evaluating carbon balance ====
  
== Documentation ==
+
'''''[http://www.barronh.com/ Barron Henderson] wrote:'''''
  
* [http://acmg.seas.harvard.edu/geos/wiki_docs/chemistry/chemistry_updates_v5.pdf Updated chemical reactions] now used in [[GEOS-Chem v8-02-01]] and higher.
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<blockquote>[I created] an evaluation script to preserve balances going forward as the mechanism evolves (e.g., as isoprene gets updated).  
**All typos have now been corrected in the present file.
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Currently, this done using an off-line script described in a [http://www.evernote.com/l/ATuCIZsKADFPPKnKQBlk07TFevitHHQ1Q_o/ linked note]. The approach is pretty straight-forward, but could be expanded to check conservation of functional groups as suggested by Mat.
* [http://acmg.seas.harvard.edu/geos/wiki_docs/chemistry/jv_spec_format.pdf Format of FAST-J input file <tt>jv_spec.dat</tt>]
+
  
--[[User:Bmy|Bob Y.]] 12:15, 22 September 2009 (EDT)
+
Longer term, the same technique would ideally be built-in to the standard KPP as an optional report. I discussed it with Michael Long and we both think that KPP has most of the capability for atom conservation (if not all). It may simply be a matter of defining the chemical formulas in the *.spc file.</blockquote>

Latest revision as of 15:50, 30 January 2024

All users interested in the GEOS-Chem chemistry scheme and associated processes (photolysis, heterogeneous, deposition) are encouraged to subscribe to the chemistry email list (click on the link in the contact information section below).

Contact information

Oxidants and Chemistry Working Group Co-Chairs
Oxidants and Chemistry Working Group email list geos-chem-oxidants [at] g.harvard.edu
To subscribe to email list Either
  • Send an email to geos-chem-oxidants+subscribe [at] g.harvard.edu

Or

To unsubscribe from email list Either
  • Send an email to geos-chem-oxidants+unsubscribe [at] g.harvard.edu

Or

--Bob Y. (talk) 18:29, 21 August 2015 (UTC)

Current GEOS-Chem Chemistry Projects (please add yours!)

User Group Description Contact Person Date Added
NASA LARC Scheme for higher PN production from aromatics, MEK, monoterpenes, glycolaldehyde, and 1,3-butadiene Katherine R. Travis 19 Sep 2023


Columbia University Automated model reduction isoprene oxidation mechanism Benjamin Yang

Dan Westervelt

12 Sep 2023
NOAA CSL JPL Kinetic Review Update/C-N balance/stoichiometry update Kelvin Bates 01 Jul 2023
University of York Nitrate Photolysis Mat Evans

Matthew Rowlinson

08 Jun 2022
University of York Halogen reverse reactions Mat Evans

Hansen Cao

01 Jun 2022
University of York Chlorine chemistry Mat Evans

Amy Lees

01 Oct 2022
Harvard University and
MPIC-Mainz
Further development of The Kinetic PreProcessor (KPP) Bob Yantosca (GCST) 03 Jun 2022
Harvard University Adding an adaptive solver capability into KPP Haipeng Lin 03 Jun 2022
GCST Migrating the Hg chemistry mechanism to KPP Bob Yantosca (GCST) 03 Jun 2022
GCST Adding a CO-CO2-CH4-OCS chemistry mechanism with KPP Bob Yantosca (GCST) 03 Jun 2022
U Montana Furans chemistry in MCM and in GEOS-Chem Lixu Jin
Lu Hu
21 May 2022
U Wollongong Evaluation of aromatic oxidation products using new observational constraints Stephen MacFarlane 9 June 2022
UNSW, Sydney Contribution of the unexplored photochemistry of aldehydes to the tropospheric levels of hydrogen Maria Paula Perez-Pena 25 June 2021
University of California, Riverside Updates to DMS oxidation scheme William Porter 26 August 2020
Harvard University Overhaul of cloud pH code including: use of Newton's method and addition of crustal cations and organic acids Viral Shah
Jonathan Moch
5 May 2019
U Alaska Fairbanks Monoterpene oxidation and its impact on SOA formation Yiqi Zheng
Jingqiu Mao
21 April 2019
MIT Simulating the global reactive carbon budget Sarah Safieddine 12 April 2017
FSU Stratosphere-troposphere coupling, improvements to UCX & H2 chemistry Chris Holmes May 2017
FSU Methane and methyl chloroform lifetimes Chris Holmes May 2017
FSU Arctic halogen & ozone chemistry Chris Holmes May 2017

Current GEOS-Chem Chemistry Issues (please add yours!)

Carbon balance

Script for evaluating carbon balance

Barron Henderson wrote:

[I created] an evaluation script to preserve balances going forward as the mechanism evolves (e.g., as isoprene gets updated).

Currently, this done using an off-line script described in a linked note. The approach is pretty straight-forward, but could be expanded to check conservation of functional groups as suggested by Mat.

Longer term, the same technique would ideally be built-in to the standard KPP as an optional report. I discussed it with Michael Long and we both think that KPP has most of the capability for atom conservation (if not all). It may simply be a matter of defining the chemical formulas in the *.spc file.