CH4 simulation

NOTE: Page under construction

This page contains information about the methane (CH4) simulation in GEOS-Chem.

Overview

The CH4 simulation in GEOS-Chem ...

Authors and collaborators

• Christopher Pickett-Heaps (Harvard)
• Kevin Wecht (Harvard)
• Jerome Drevet (formerly @ EPFL)
• James Wang (formerly @ Harvard)

CH4 simulation user groups

User Group	Personnel	Projects
Harvard University	Christopher Pickett-Heaps Kevin Wecht	Methane sources in the Arctic
U. Wollongong	Chris Chan Miller	Methane sources in tropical Australia

Known issues

Error reading GWETTOP fields

Melissa Payer discovered a file read error in the current CH4 simulation. We will fix this issue in GEOS-Chem v9-01-03.

Melissa Payer wrote:

I got the offline CH4 simulation rice emissions to work. It turns out that XTAU is being reset [to a the wrong value] when GWETTOP is read. To fix this, I added the following code in RICE_EMIS prior to setting the soil wetness FILENAME:

     ! Determine year for soil wetness files (mpayer, 1/31/12)
     IF ( GET_YEAR() < 2004 ) THEN
        CYEAR  = '2004'
        CYEAR2 = 2004
     ELSEIF (GET_YEAR() > 2009 ) THEN
        CYEAR  = '2009'
        CYEAR2 = 2009
     ELSE
        WRITE( CYEAR, '(i4)' ) GET_YEAR()
        CYEAR2 = GET_YEAR()
     ENDIF

I also changed:

     XTAU = GET_TAU0( 1, 1, GET_YEAR() )

to:

     XTAU = GET_TAU0( 1, 1, CYEAR2 )

For both annual and monthly mean GEWTTOP. That seems to work and it reads the file for the proper simulation year.

--Bob Y. 10:29, 1 February 2012 (EST)