CESM WG co-chair meeting

March 4 2014

Recent WG co-chair changes

• Paleo Charles Jackson (U. Texas) in replacement of F. Joos

• PolarNicole Jeffery (LANL) in replacement of E. Hunke

• Chemistry-Climate Louisa Emmons (NCAR) in replacement of me

Announcements/Updates

CSL Usage:Development: 71%/120% for 30/90 day (150%/133% cut off)Production: 172%/179% for 30/90 day (220%/190% cut off)

Other updates/announcements?

LMWG/BGCWG/SDWG meeting updates

Glade usage:/glade/p/cesm 222.34 TB (240.00 TB) 92.64 % /glade/p/cesm0005 356.91 TB (400.00 TB) 89.23 %

Release updates?

CLM Development Timelines: The path towards CLM5/CESM2

1/2014 1/2015 CAM5+

6/2016CESM2

Hydro: New soil evap, BTRAN, can turb parameterization

test/eval

CLM(ED) v0 to trunk

Biog

eohy

sBi

ogeo

chem

CAM5-CLM4.5BGC eval/tuning

CLM5 model in CESM2(CAM5+)

for CMIP6

CLM5 BGC eval/tune (fire, CH4,

flood, dust, ???)

Soil vert res incr?

6/2015CESM1.3

6/2014 1/2016

Coup

led

mod

el /

capa

biliti

es

Dynamic landunits

Fully coupled BGC eval/tune of CLM5 and/or

CAM5+

CLM(ED) v1/2 w/ harvest, soil bgc, N?

MOSART decision/

implementation

Benchmark system

Anom forcing, CO2 datm

Restart regrid online

Hydro refact

Interann LAI SP

N-comp refact

Snow: veg interact, vert abs

N-comp test/eval

180, reactive trans

DGVM(or ED)/crop DynLand test

Stress-decid phenology

CLM5 control sims (BGC-crop, SP, ED?)

Urban update

Global crops, manure, fert

CLM5(ED) ready for coupled sims

1/2017?

RTM Flood/wetlnd full

implement

Dynamic Landunits: Current Status

GlacierArea

NaturalVeg.Area

Year 1 Year 2 Year 3 Year 4 Year 5

% of grid cell

Fast deglaciation experiment: 100% to 0% in 5 years

Albedo (fraction)

No-snowAlbedo

BGC Updates from OMWG Meeting

• Joint efforts between OMWG & BGCWG to resolve issues w/ Southern Ocean ventilation

• Enhanced isopycnal mixing improves OMZ biases, and improves CFCs. Anistropic GM could help and seems appropriate.

• Fast BGC spinup working for 14C, still in progress for full ecosystem model

• Work on including impact of ocean acidification on BGC processes is progressing

Intended for CESM 2.0, timelines TBDTarget Date Development Key Developers Involved WGs

Ecosys software engineering enhancements K Lindsay, A Jahn

Updated treatment of PAR handling N Norton, K Lindsay PCWG

DOM updates K Moore

IRF for offline models & NK spinup K Lindsay

Optional Phaeocystis S Wang

Coupling to Atm Chem (CH4, DMS, NH) M Maltrud, NH TBD ChemWG

C Isotpoes (coupled and uncoupled) A Jahn AMWG, PCWG, LMWG

Coupled H2O Isotopes E Brady AMWG, PCWG, LMWG

Iron in Sea-Ice S Wang PCWG

Couple to skeletal Sea-Ice BGC N Jeffery PCWG

Ocean Acidification Feedbacks S Wang

Uncoupled N Isotopes S Yang

Well Mixed Atm CO2 Box TBD

potential for CESM 2.0, timelines TBDTarget Date Development Key Developer Involved WGs

Make BGC core independent of GCM TBD

Temporal treatment of PAR TBD

Explicit Calcifier Functional Group K Lindsay

Spatially varying iron ligand K Misumi

Coupled riverine inputs C Nevison LMWG

N20 emissions TBD ChemWG

Couple to depth resolved Sea-Ice BGC N Jeffery PCWG

BGC Developments for CESM2

• All developers that have been queried think their update can be ready in time (early 2015)

• Merging and testing all intended code might be infeasible

• Coupling BGC to AtmChem is priority of SSC, but no one is doing the work

• Coupling land and ocean BGC via rivers is frequently requested, but no one is doing the work

SDWG update

• CESM-IAM linkage code: iESM proceeding but no hard timeline; THESIS project under way

• Plan session at Breckenridge on CMIP6 (follow up to last year’s session), particularly on ScenarioMIP, LUMIP (and AerChemMIP?)

• Needs/wish list for CESM developments, outputs, diagnostics, etc. to be formally communicated to other WGs

• Re-orientation of WG agreed to (see following slides)

Proposal #1: SDWG focus

Adopt broader focus:

Improve the use of CESM, other ESMs, or their emulators in research on mitigation, adaptation, and impacts

Rather than:

“a focus on interactions between CESM and two research and user communities: integrated assessment modeling and water management”

Proposal #2: FunctionsIdentify, and communicate to other WGs, needs for CESM from IAM/IAV perspective model simulations output variables

model improvements downscaling, bias correction

model diagnostics model emulation

Produce prioritized list of CESM simulations, and carry them out with SDWG allocation (next proposal: August)

CESM linkages to human systemsGatekeeper for CESM linkage code

Repository of/guide to human system variables that appear in CESM

Proposal #3: Meeting format/content

TalksSubmitted abstracts on any human dimensions work relevant to WG functions

Reports on ongoing projects of broader relevance to group (iESM, THESIS, Water diagnostics EaSM, etc.)

Reports on other projects that could benefit from SDWG involvement or that could inform WG functions (CIRA, LAMP, BRACE, LUC4C, etc.)

DiscussionsNeeds for CESM simulations, developments, diagnostics, etc.

Contributions to other projects

Input to community processes (CMIP, other MIPs, IAMC, …?)