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CHANGES IN CO AND OZONE OVER RECENT MODEL VERSIONS

Rynda Hudman

Group Meeting June 6, 2007

IF YOU WANT TO KNOW HOW THE MODEL DOES FOR SPECIES LOOK AT BENCHMARKS vs. CLIMATOLOGY (AVAILABLE ONLINE)

v7.02.03Too low in spring at NH Too flat a seasonal cycle for CO

Too low in spring at NH Too flat a seasonal cycle for COv7.02.03

Just look at redline for now…

At midlatitudes an underestimate in summer, over estimate in winter.

v7.02.03

--OZONE

IF YOU WANT TO KNOW HOW THE MODEL DOES FOR SPECIES LOOK AT BENCHMARKS vs. CLIMATOLOGY --OZONE

v7.02.03

PROBLEM: CO & OZONE ARE CHANGING IN RECENT MODEL VERSIONS AND WE HAVEN’T KEPT TRACK OF WHY

Example: Cold Bay, Alaska CO (ppbv)

Particularly large changes in summer months

v.7.03.02 v.7.04.02 v.7.04.12

20 ppbv

ISOROPIA

MEGAN

EMEP

Midlat LNOX

Streets

Var Trop

Near Land Lightning (buggy)

BRAVO and HO2 uptake turnoff

OH HISTORY GEOS-Chem (GEOS-3 METEOROLOGY)

BUT WHAT ABOUT GEOS-4?MODEL VERSION(Jan-Apr, May-Aug, Sep-Dec)

GEOS4 GEOS3

v.7.02.03(11.67, 11.70, 12.23)

11.87 10.48

v.7.04.02 (1995)(12.38,12.66,12.58)

12.54

v.7.04.02 (1998, NO MEGAN)(12.40, 12.67, ~12.58)

12.55

v.7.04.02 (1998, WITH MEGAN)(12.16,12.8,12.34)

12.44 10.75

v.7.04.12 (1998, w/ Megan + old lightning)(11.16, 12.48, 11.64)

11.77

v.7.04.12 (1998, w/ Megan + new lightning)(12.18,13.5,12.77)

12.8 10.95

OH (105 molecs/cm3)

2005

2001

+6%

++ changes regionally

- 5%

+9%

CO DECREASES WHEN MOVING TO v7.04.02

July 2001January 2001

v7.04.02 - v7.02.03

July 2001January 2001

v.7.02.03 v.7.04.02

Changes:

-Dry Deposition criteria (from Re >1 to Re > 0.1) – NO CHANGE ON CO

-SOA Chemistry included – NO CHANGE

X ISOROPIA- – NOT SURE…

-NEI 99 bug fixed (weekday only weekday/weekend)

X Land/Water/Ice Flag (Bug fix for GEOS4, if >50% consider land, before had to 100% land) – SOME CHANGE (ENOUGH?)

X MEGAN – LOOKED AT SEPARATELY

Did one month sensitivity to see what these each do..

January CO (ppbv) DIFFERENCE BETWEEN v.7.04.02 - v.7.02.03 (No MEGAN)

0-2.6 km

Changes in the summer coasts

v.7.04.02 OH (JAN) v.7.02.03

July CO (ppbv) DIFFERENCE BETWEEN v.7.04.02 - v.7.02.03 (No MEGAN)

0-2.6 km

v.7.04.02 OH (JUL) v.7.02.03

Changes in the summer coasts

WHAT ABOUT OZONE? (v7.04.02 – v 7.02.03)

July Jan

JANJULY

Alt (

km)

NEI Bug Fix

-Land/Water/Ice Flag (Bug fix for GEOS4: if >50% consider land, before grid box had to 100% land)

Land Water Indicesv.7.02.03 v.7.04.02

BUG FIX

-Land/Water/Ice Flag (Bug fix for GEOS4: if >50% consider land, before grid box had to 100% land)

July mean CO 1 month w/o bug fix

July CO (ppbv)

DIFFERENCE BETWEEN v.7.04.02 - v.7.02.03

0-2.6 km

Location of change in surface NOx-LI-$ CO changeIS ONE MONTH TOO SHORT?

AFTER 3 months…CO

Just changing Land use… Properly spunup etc…

Just changing Land use…

AFTER 3 months OZONE…need to look a bit more closely because we don’t see this in ozone comparisons


GEOS4 GEOS3

v.7.02.03(11.67, 11.70, 12.23)

11.87 10.48

v.7.04.02 (1995)(12.38,12.66,12.58)

12.54

v.7.04.02 (1998, NO MEGAN)(12.40, 12.67, ~12.58)

12.55

v.7.04.02 (1998, WITH MEGAN)(12.16,12.8,12.34)

12.44 10.75


11.77


12.8 10.95

OH (105 molecs/cm3)

2005

2001

+6%


- 5%

+9%

ISOPRENE SOURCE – MEGAN puts more emissions in tropics less at midlatitudes.

January July

0-2.

6 km

15 S - Jan

42 N - Jul

MEGAN causes decrease in NH, Increase in tropics

Alt

(km

)

MEGAN – NO MEGAN

CO

January July

0-2.

6 km

Ozone

Alt

(km

)

MEGAN – NO MEGAN

Ozone

42 N - Jul

15 S - Jan


GEOS4 GEOS3

v.7.02.03(11.67, 11.70, 12.23)

11.87 10.48

v.7.04.02 (1995)(12.38,12.66,12.58)

12.54

v.7.04.02 (1998, NO MEGAN)(12.40, 12.67, ~12.58)

12.55

v.7.04.02 (1998, WITH MEGAN)(12.16,12.8,12.34)

12.44 10.75


11.77


12.8 10.95

OH (105 molecs/cm3)

2005

2001

+6%


- 5%

+9%

v.7.04.02 v.7.04.12 (RUN1)

Changes:

-Turned off HO2 uptake on aerosol will increase ozone

-Variable Tropopause ?

-Updated Dust ?

- Ozone columns 1979 – 2005 ?

This run used old fossil fields/default biomass climatology, MEGAN, new TOMS, updated dust, no SOA, old lightning

Kondo et al,2007

Kondo et al,2007

L=surface level Ox L=5.5 km Ox

ppbv Ox


GEOS4 GEOS3

v.7.02.03(11.67, 11.70, 12.23)

11.87 10.48

v.7.04.02 (1995)(12.38,12.66,12.58)

12.54

v.7.04.02 (1998, NO MEGAN)(12.40, 12.67, ~12.58)

12.55

v.7.04.02 (1998, WITH MEGAN)(12.16,12.8,12.34)

12.44 10.75


11.77


12.8 10.95

OH (105 molecs/cm3)

2005

2001

+6%


- 5%

+9%

WHAT ABOUT OZONE? (EFFECTS OF LIGHTNING REDISTRIBUTION)

What is in the code now:

Regional redistribution (rectangles)

500 moles/flash in midlatitudes

250 moles/flash in the tropics

Changes Lee is investigating:

Spatial clustering

v.7.04.12 (RUN1) v.7.04.12 (RUN2)

LIGHTNING

Max = 20.24

EFFECTS OF LIGHTNING REDISTRIBUTION

Helps in some areas..worse in others…V7.04.02 (All w/ MEGAN) V7.04.12 (Old Lightning) V7.04.12 (New Lightning)

EFFECTS OF LIGHTNING REDISTRIBUTION

Helps in some areas..worse in others…

YEAR 6 – Stratospheric Ox

2x25 4x5

FUTURE COMPARISONS (Please help fill in)

- Stratospheric tracer (Wild et al., xxxx)

RECOMMENDATIONS FOR FUTURE BENCHMARKS

- Do 1-month benchmarks for all used Met fields (GEOS4 and GEOS5)

- Absolute and % Difference plot for species of particular interest (e.g., OH, NOx, CO, ozone)

-Profile plots across tropics (15S) and midlatitudes(42N) to see evrtical extent of changes

-Make ozone comparisons range be from 0 – 100 to be able to see what is happening in the troposphere. Plot ranges hide changes at lower troposphere.

BACKUP

OCTOBER WITH AND WITHOUT MEGAN

MARCH WITH AND WITHOUT MEGAN