CCSM Isotope Organizational Meeting

CCSM Workshop, Breckenridge, Wednesday, 25 June 2003, 5:30-6:30pm

Introduction

Natalie Mahowald

The goal of the meeting was to encourage the development and use of CCSM for isotope studies. Isotopes are important tools for understanding many different processes, including biogeochemistry, paleoclimate, water cycling, and chemistry. Thus, isotopes are beyond one working group.

We are currently being vague about which isotopes (water, carbon) in order to determine whether they are productive overlaps in the isotopes. Later we may want to restrict ourselves to certain subsets.

This is a short meeting, so we cannot talk about science, but rather about the interests, status of CCSM work, overlaps, complementary work, as well as gaps. We would like to encourage entrepenurial efforts becoming part of the community model. We would also like to find out about problems with the component models that make doing isotopes harder (e.g., transport issues, canopy air space).

Agenda: 1. Who is here (brief introductions—at end of minutes).

2. Brief presentations of current CCSM work

3. Discussion of future

People working on isotopes in CCSM

Noone: del 18O in water and carbon, Deuterium, and del 13C. Have done model simulations in Australian model as well as CCSM. Goals: biogeochemistry, paleoclimate, and water cycling.

Gettelman: WACCM2 w/Dessler UMD, working in MOZART (offline model first). Goals: stratosphere and water cycle—diagnostics of convection in GCMS.

Fung: del 18O in water. Goals: divide sources to where water rains out.

Have identified numerical problems: need to tell dynamical core people

Carbon: del C14, C13 in terrestrial carbon pools and oceans. Also doing STE work with Randerson on C14.

Denning: Implemented c13 code in canopy photo model CLM2.1 (poster) for biogeochemistry work;

connect w/Fung to link terrestrial w/air-sea for d13CO2;

propagate isotope ratios out w/TRANSCOM-2. Used inversion codes.

Emmons: 13CO to quantify contributions from different sources.

Finished working out mechanism: trace through all the oxidation processes (double mechanism)

Need to simulate and compare to observations (Mak obs).

Summary: CO2 (13CO2, 14CO2; C18OO), CO (13CO), H2O (17O, 18O, D): Brief discussion concluded that these were complementary and linked, so no reason to separate discussion too much.

Discussion

Community, especially those who have built isotope models, are willing to propogate this entrepenurial work into the community model.

How can we facilitate this work?

1. Workshop? Money may exist? NCAR workshop?

Fung: write a two page proposal to SSC, workshop on modeling components.

Requirements, invite observationalists

2. Communicate Interests

paragraph collected-distributed (community thought this would be unnecessary given workshop)

3. Identification of component model issues

-advection in atmosphere? Others?

Meeting attendees indicated that they thought there was high level political interest in isotopes from IAEA to do joint activities on the water cycle (e.g., GEWEX as part of WMO). However, there is little ongoing measurement in the U.S., and we should encourage more measurements.

There are non-traditional measurements of isotopes: e,g., JPL using remote sensing techniques.

There was consensus that a workshop should be conducted during the fall to gather the momentum. Water should be the highest priority, although carbon work should be encouraged to proceed (since it has momentum now). Mahowald will lead workshop application to CCSM (with Gettelman and others at NCAR).

Gap: Ocean isotopes: Fung will look into resolving this.

Comments: send to Natalie.

Attendee List

Last Name	First	EMAIL	INTEREST
Jackson	Charles	charles@ig.utexas.edu	Paleoclimate
Anderson	David	david.m.anderson@noaa.gov	oceans, paleoclimate
Trenberth	Kevin	trenbert@ucar.edu	water cycle
Otte-Bliesner	Bette	ottobli@ucar.edu	Paleoclimate
Gettelman	Andrew	andrew@ucar.edu	water cycle, water vapor, transport
Peterson	Bill	bill@essc.psu.edu	paleoclimate
Henderson-Sellers	Ann	ahs@ansto.gov.au	land surface and isotope obs
Denning	Scott	denning@atmos.colostate.edu	c isotopes in land, ocean, atmosphere
Suits	Neil	Nsuits@atmos.colostate.edu	c & o terrestrial
Baker	Ian	baker@atmos.colostate.edu	land-atmosphere interactions
Shield	Christine	shields@ucar.edu	paleoclimate
Bradbury	James	bradbury@geo.umass.edu	paleo-icecore
Koster	Randy	randal.d.koster@nasa.gov	general - worked with GISS isotope model
Conley	Andrew	aconley@ucar.edu	Transport
Fillmore	David	fillmore@ucar.edu	Atmospheric transport
Yang	Woo-Sun	wyang@lbl.gov	Terrestrial biogeochemistry
Ammann	Caspar	ammann@ucar.edu	paleoclimate proxy
Brady	Esther	brady@ucar.edu	proxy data - model
Pierazzo	Elisabetta	betty@psi.edu	environmental
Huber	Matthew	huberm@purdue.edu	paleoclimate model
Sewall	Jake	jsewall@es.ucsc.edu	paleoclimate proxy COH
Shellito	Cindy	shellito@es.ucsc.edu	paleoclimate
McKenna	Danny	danny@ucar.edu	Atmospheric chemistry
Lamarque	JF	lamar@ucar.edu	atomospheric chemistry
Emmons	Louisa	emmons@ucar.edu	isotopes of CO
Hess	Peter	hess@ucar.edu	isotopes of CO, atmospheric chemistry
Stephens	Britt	stephens@ucar.edu	O2, 12C, paleo + modern
Zak	Bernie	BDZak@sandia.gov	isotope use in model validation
Caballero	Rodrigo	rca@geosci.uchicago.edu	oxygen isotopes
Doney	Scott	sdoney@whoi.edu	carbon, oxygen, hydrogen(3H)
Fung	Inez	inez@atmos.berkeley.edu	carbon, water, dust
Bitz	Cecilia	bitz@apl.washington.edu	climate record in icecore
Eldering	Annmarie	annmarie.eldering@jpl.nasa.gov	obs/remote sensing H2) isotopes
Noone	David	dcn@caltech.edu	convection, paleo, CO2, land
He	Y (Helen)	yhe@lbl.gov	iso LSM in MM5
Vuille	Mothias	mathias@geo.umass.edu	paleo ice tropics
Mahowald	Natalie	mahowald@ucar.edu