Title: E' S' Takle1, J' Roads2, W' J' Gutowski, Jr'1, B' Rockel3,
1Transferability as a Strategy for Researching the
Water Cycle and Energy Budget at Regional Scales
- E. S. Takle1, J. Roads2, W. J. Gutowski, Jr.1, B.
Rockel3, - R. W. Arritt1, and I. Meinke2
- 1Iowa State University, Ames, IA
- 2Scripps Institution of Oceanography,
UCSD,LaJolla, CA - 3GKSS Research Centre, Geesthacht , Germany
- gstakle_at_iastate.edu
2Objective
- Regional climate model transferability
experiments are designed to advance the science
of high-resolution climate modeling by taking
advantage of continental-scale observations and
analyses.
3Objective
- Regional climate model transferability
experiments are designed to advance the science
of high-resolution climate modeling by taking
advantage of continental-scale observations and
analyses. - At the GHP-9 in September 2003 interest emerged
for creating a working group to actively promote
this approach to study the energy budget and
water cycle.
4Use of Regional Models to Study Climate
- How portable are our models?
5Use of Regional Models to Study Climate
- How portable are our models?
- How much does tuning limit the general
applicability to a range of climatic regions?
6Use of Regional Models to Study Climate
- How portable are our models?
- How much does tuning limit the general
applicability to a range of climatic regions? - Can we recover some of the generality of
first-principles models by examining their
behavior on a wide range of climates?
7Transferability Working Group (TWG) Overall
Objective
- To understand physical processes underpinning the
global energy budget, the global water cycle, and
their predictability through systematic
intercomparisons of regional climate simulations
on several continents and through comparison of
these simulated climates with coordinated
continental-scale observations and analyses
8Types of Experiments
- Multiple models on multiple domains (MM/MD)
- Hold model choices constant for all domains
9Types of Experiments
- Multiple models on multiple domains (MM/MD)
- Hold model choices constant for all domains
- Not
- Single models on single domains
- Single models on multiple domains
- Multiple models on single domains
10TRANSFERABILITY EXPERIMENTS FOR ADDRESSING
CHALLENGES TO UNDERSTANDING GLOBAL WATER CYCLE
AND ENERGY BUDGET
ARCMIP
GLIMPSE
BALTEX
BALTIMOS
BALTEX
GKSS/ICTS
PRUDENCE
RMIP
MAGS
SGMIP
QUIRCS
PIRCS
CAMP
GAPP
GAPP
GAME
GAME
LBA
LBA
IRI/ARC
AMMA
CATCH
MDB
LA PLATA
MDB
11Specific Objectives of TWG
- Provide a framework for systematic evaluation of
simulations of dynamical and climate processes
arising in different climatic regions
12Specific Objectives of TWG
- Provide a framework for systematic evaluation of
simulations of dynamical and climate processes
arising in different climatic regions - Evaluate transferability, that is, quality of
model simulations in non-native regions
13Specific Objectives of TWG
- Provide a framework for systematic evaluation of
simulations of dynamical and climate processes
arising in different climatic regions - Evaluate transferability, that is, quality of
model simulations in non-native regions - Meta-comparison among models and among domains
14We recognize that
- The water cycle introduces exponential, binary,
and other non-linear processes into the climate
system
15We recognize that
- The water cycle introduces exponential, binary,
and other non-linear processes into the climate
system - Water cycle processes occur on a wide range of
scales, many being far too small to simulate in
global or regional models
16We recognize that
- The water cycle introduces exponential, binary,
and other non-linear processes into the climate
system - Water cycle processes occur on a wide range of
scales, many being far too small to simulate in
global or regional models - The water cycle creates spatial heterogeneities
that feed back strongly on the energy budget and
also the circulation system
17Strategy
- Identify key processes relating to the water
cycle and energy budget that express themselves
to different degrees in different climatic
regions
18Strategy
- Identify key processes relating to the water
cycle and energy budget that express themselves
to different degrees in different climatic
regions - Create hypotheses that can be tested by use of
MM/MD experiments. Candidate examples - Physical parameterizations connected with the
water cycle cause all models to have a cool bias - Physical parameterizations connected with the
water cycle are the largest source of error in
simulating the diurnal cycle
19Expected Outcomes
- Improved understanding of the water cycle and its
feedbacks on the energy budget and circulation
system
20Expected Outcomes
- Improved understanding of the water cycle and its
feedbacks on the energy budget and circulation
system - Improved capability to model climate processes at
regional scales
21Expected Outcomes
- Improved understanding of the water cycle and its
feedbacks on the energy budget and circulation
system - Improved capability to model climate processes at
regional scales - Improved applicability to impacts models
22Plan of Work
- Phase 0 Write an article for BAMS summarizing
lessons learned from various MIPs and how
transferability experiments will provide new
insight on the global climate system,
particularly the water cycle and energy budget,
report preliminary results
23Plan of Work
- Phase 0 Write an article for BAMS summarizing
lessons learned from various MIPs and how
transferability experiments will provide new
insight on the global climate system,
particularly the water cycle and energy budget,
report preliminary results - Phase 1 Conduct pilot studies
24Plan of Work
- Phase 0 Write an article for BAMS summarizing
lessons learned from various MIPs and how
transferability experiments will provide new
insight on the global climate system,
particularly the water cycle and energy budget,
report preliminary results - Phase 1 Conduct pilot studies
- Phase 2 Perform sensitivity studies on key
processes relating to the water cycle. Create and
test hypotheses by MM/MD
25Plan of Work
- Phase 0 Write an article for BAMS summarizing
lessons learned from various MIPs and how
transferability experiments will provide new
insight on the global climate system,
particularly the water cycle and energy budget,
report preliminary results - Phase 1 Conduct pilot studies
- Phase 2 Perform sensitivity studies on key
processes relating to the water cycle. Create and
test hypotheses by MM/MD - Phase 3 Prediction, global change, new
parameterizations
26Transferability Consolidates Lessons Learned from
Modeling and Observations
- Models Use experience gained from simulating
home domains
27Transferability Consolidates Lessons Learned from
Modeling and Observations
- Models Use experience gained from simulating
home domains - CEOPS Use dominant features of the water cycle
and energy budget of each CSE to generate
testable hypotheses - Review what has been learned
- Identify unique climate features
28Transferability Experiments Meet GEWEX Phase II
Objectives
- Produce consistent descriptions of the Earths
energy budget and water cycle
29Transferability Experiments Meet GEWEX Phase II
Objectives
- Produce consistent descriptions of the Earths
energy budget and water cycle - Enhance the understanding of how the energy and
water cycle processes contribute to climate
feedback
30Transferability Experiments Meet GEWEX Phase II
Objectives
- Produce consistent descriptions of the Earths
energy budget and water cycle - Enhance the understanding of how the energy and
water cycle processes contribute to climate
feedback - Develop parameterizations encapsulating these
processes and feedbacks for atmospheric
circulation models
31Current Status
- Three models (RSM/Scripps, Lokalmodell/GKSS,
RegCM3/ISU) simulating four domains (GAPPMAGS -
North America, MDB - Australia, LBA - South
America, and BALTEX - Europe)
32Current Status
- Three models (RSM/Scripps, Lokalmodell/GKSS,
RegCM3/ISU) simulating four domains (GAPPMAGS -
North America, MDB - Australia, LBA - South
America, and BALTEX - Europe) - More collaborating modeling groups are being
sought
33Current Status
- Three models (RSM/Scripps, Lokalmodell/GKSS,
RegCM3/ISU) simulating four domains (GAPPMAGS -
North America, MDB - Australia, LBA - South
America, and BALTEX - Europe) - More collaborating modeling groups are being
sought - Contact E. S. Takle (gstakle_at_iastate.edu)
34Transferability Domains and CSE Reference Sites
Reference Sites