TOMCAT CTM Hannah Mantle Martyn Chipperfield Ryan Hossaini Wuhu Feng Institute for Climate and Atmospheric Science SCHOOL OF EARTH AND ENVIRONMENT Brief description of TOMCAT 3D CTM Previous TOMCAT work on CH ID: 815251
Download The PPT/PDF document "Quantifying VSLS Emissions Using the" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Quantifying VSLS Emissions Using the TOMCAT CTMHannah MantleMartyn Chipperfield, Ryan Hossaini, Wuhu Feng
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Brief description of TOMCAT 3-D CTM
Previous TOMCAT work on CH
2
Br
2
and CHBr
3
emissions
Initial comparisons with CAST
data
Full chemistry iodine simulations
Slide2TOMCAT 3-D Chemical Transport ModelOffline global 3-D CTM Forced by ECMWF (ERA-Interim) meteorology
Horizontal resolution = 1⁰ x 1⁰
60 σ-p levels in model atmosphere (surface to ~60 km)Different options for chemistry/aerosol schemes, e.g.
Idealised tracersFull stratospheric chemistry (Talk by
Jochen Stutz)Detailed tropospheric chemistryVSLS emission inventories:
CHBr3CH2Br2CH3
IMinor VSLS442
1
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide3VSLS Emissions in TOMCATGg yr-1
Inventory
Approach
CHBr
3CH2Br2CH3ILiang (2010)Top-down
45062-Warwick (2006)Top-down
38057-Ordonez (2012)
Top-down
533
67
303
Ziska
(2013)
Bottom-up183
64
206
Poorly constrained
Limited observations
Emissions not uniform
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Bell et al. 2002
Slide4VSLS Emissions in TOMCAT
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Liang
Warwick
Ordonez
Ziska
CHBr
3
Liang
Warwick
Ordonez
Ziska
CH
2
Br
2
Slide5Previous Emissions WorkHossaini et al., ACP, (2013).
Tested performance of CHBr3 and CH
2Br2 inventories in TOMCAT 3-D CTMCompared with 3 datasets: NOAA/ESRL, HIAPER Pole-to-Pole (HIPPO) and SHIVA
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
C/C/A
Slide6Near Real-Time Output– CHBr3Model run in ‘near real-time’ – 1o x 1o
Global fields and station output (6-hourly)
see.leeds.ac.uk/tomcat Search: TOMCAT Leeds
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide7NOAA/ESRL Flask Comparisons – CHBr
3
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide8HIPPO Aircraft Comparisons
CHBr
3
HIPPO-3
HIPPO-4
HIPPO-3
HIPPO-4
Tropics
mean profiles
CH
2
Br
2
Hossaini et al.
2013
Evaluating global
emission inventories
of biogenic
bromocarbons
– ACP
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide9Stratospheric BryVSLS Loading
Quantified stratospheric
BryVSLS loadingIdentified factor of 2 discrepancy between emission inventories
Optimised estimateCHBr
3 – Ziska (2013)CH2Br2 – Liang (2010)
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Hossaini et al.
2013
,
Evaluating global
emission inventories
of biogenic
bromocarbons - ACP
Slide10CAST Campaign Profiles
CHBr
3
CH
2Br2CH3I
667 WAS canisters
collected across campaign - CASTData: Stephen Andrews – University of York
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Ziska
(bottom-up)
Overestimate.
L
/
W
(top down)
Underestimate
Slide11CONTRAST Flight Track Comparisons
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
CONTRAST
PRELIMINARY
TOGA
data – B. Hornbrook, E.
Apel
, D.
Riemer
RF03 example – 17/01/14
Slide12Full Chemistry Halogen ModelFull gas-phase iodine chemistry and heterogeneous chemistryOrganic Br/I emissions and inorganic emissions (HOI and I
2)
Model chemistry scheme includes Ox-NOx-HOx-Cl-C3 with isoprene and detailed tropospheric halogen chemistry
Annual average (2007) IO
pptv
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide13Full Chemistry Halogen ModelFull gas-phase iodine chemistry and heterogeneous chemistryOrganic Br/I emissions and inorganic emissions (HOI and I2)
Model chemistry scheme includes Ox-NOx-HOx-Cl-C3 with isoprene and detailed tropospheric halogen chemistry
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
HaloCAST
-P IO
- Model
-
Obs
Thanks to
Anoop
Mahajan and Alfonso
Saiz
-Lopez
Mahajan
et al., 2012 - ACP
Slide14Summary
TOMCAT 3-D CTM run with multiple VSLS emission
inventories over campaign periodHigh resolution model output available
Preliminary CAST comparisons agree with previous findings
CH3I appears to be underestimated by both available emission inventoriesNext steps: compare with full suite of VSLS observations from all campaignsFull chemistry version of model available for collaborations
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide15Near Real-Time Output - Profiles
see.leeds.ac.uk/tomcat Search: TOMCAT Leeds
CHBr
3
CH2Br2
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide16SHIVA Comparisonssee.leeds.ac.uk/tomcat Search: TOMCAT Leeds
Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide17Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT
Slide18Institute for Climate and Atmospheric Science
SCHOOL OF EARTH AND ENVIRONMENT