Download ENSO changes due to heat flux adjustment in current and

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

IPCC Fourth Assessment Report wikipedia, lookup

Climate change, industry and society wikipedia, lookup

Surveys of scientists' views on climate change wikipedia, lookup

Effects of global warming on humans wikipedia, lookup

Public opinion on global warming wikipedia, lookup

Scientific opinion on climate change wikipedia, lookup

Climate change feedback wikipedia, lookup

Climatic Research Unit documents wikipedia, lookup

Solar radiation management wikipedia, lookup

Climate change and poverty wikipedia, lookup

Attribution of recent climate change wikipedia, lookup

Climate change in the United States wikipedia, lookup

Climate sensitivity wikipedia, lookup

Media coverage of global warming wikipedia, lookup

Global Energy and Water Cycle Experiment wikipedia, lookup

Climate change and agriculture wikipedia, lookup

Global warming wikipedia, lookup

General circulation model wikipedia, lookup

Citizens' Climate Lobby wikipedia, lookup

Global warming hiatus wikipedia, lookup

Climate change in Tuvalu wikipedia, lookup

Carbon Pollution Reduction Scheme wikipedia, lookup

Instrumental temperature record wikipedia, lookup

Politics of global warming wikipedia, lookup

Climate engineering wikipedia, lookup

Climate governance wikipedia, lookup

Climate change adaptation wikipedia, lookup

Global warming controversy wikipedia, lookup

Economics of global warming wikipedia, lookup

Climate change denial wikipedia, lookup

Effects of global warming on human health wikipedia, lookup

Michael E. Mann wikipedia, lookup

Climatic Research Unit email controversy wikipedia, lookup

Soon and Baliunas controversy wikipedia, lookup

Climate resilience wikipedia, lookup

Heaven and Earth (book) wikipedia, lookup

ExxonMobil climate change controversy wikipedia, lookup

2009 United Nations Climate Change Conference wikipedia, lookup

German Climate Action Plan 2050 wikipedia, lookup

Effects of global warming on Australia wikipedia, lookup

IPSL/CGAM workshop on Tropical Climate
26-27 May 2005
The monsoon-ENSO
teleconnection and different
ENSO regimes in a flux corrected
future climate
Andrew Turner, Pete Inness, Julia Slingo
Why flux adjust?
• Coupled GCMs generating mean climatologies
more in line with observations are more likely to
simulate the correct interannual variability of
tropical precipitation (Sperber and Palmer,
• State of equatorial Pacific SSTs long regarded
as an important predictor of the Asian summer
monsoon (Charney and Shukla, 1981; many
• For a GCM to be used for seasonal prediction it
should be able to simulate both these SSTs and
the teleconnection between them and the
• This depends on the Walker circulation being
correctly represented.
The Model
• Atmosphere: 3.75x2.5 at L30 (better
representation of intraseasonal tropical
convection then L19 – Inness et al., 2001).
• Ocean: 1.25x1.25, 20 levels.
• 100 year integration.
Why flux adjust?
HadCM3 mean summer climate
• 3.75lon x 2.5lat, L30 configuration (Inness et al., 2001)
HadCM3 mean summer climate
Heat flux adjustments
Annual mean
Standard deviation
• Flux adjustments
devised by Inness et al.
(2003) to give better
representation of MJO.
• Annual cycle of FA
applied to a 100 year
coupled integration.
• Tropical Pacific and
Indian Oceans only.
Improvements to the mean state
Improvements to the mean state
ENSO properties in the current climate
all are Nino-3 regions
• Shallower and more intense
thermocline in HadCM3FA,
coupled with warmer SSTs
on the equator (higher
coupling strength) allows for
stronger ENSO.
• Biennial increase related to
coupling strength.
ENSO properties in the current climate
DJF Nino-3 SST lag-correlated with equatorial Pacific SST (after Ashrit et al.,
• El Nino periodicity has greater spread.
• Better warm pool behaviour; pre-El Nino extension  more WWEs, which
help trigger El Nino (Vecchi and Harrison, 2000; Lengaigne et al., 2004)
The monsoon-ENSO teleconnection
See Turner et al. 2005 for more information!
• Stronger and better timed teleconnection
with flux adjustments.
• Monsoons feed back on Pacific system
to further intensify ENSO.
• Warmest waters further east,
repositioning the convection
and Walker circulation.
The effect of climate change
The effect of climate change
ENSO properties in future climate
ENSO properties in future climate
The teleconnection
Summary and the future…
Current climate:
• Flux adjustments, whilst having some drawbacks, can help correct
mean state and have beneficial effect on monsoon predictability.
• Stronger teleconnection (and greater coupling); more realistic
Walker circulation & El Nino development.
• Flux adjustments highlight the danger in assuming a linear system,
anomaly forecasting etc.
Future climate:
• Combining increased greenhouse gases with flux correction may be
pushing HadCM3 closer to some ‘bifurcation point’.
• An extreme monsoon may be sending ENSO into the limiting cycle,
due to increased air-sea interaction in the west Pacific.
Summary and the future…
Need to determine:
• Why is 2xCO2 FA able to flip between
different regimes?
• What causes the regime change?
anomalous monsoon (increased air-sea
coupling), period of intense WWEs?
A further HadCM3FA 2xCO2 integration will
see if biennial regime returns.
• Ashrit et al. (2003) J. Meteorol. Soc. Jpn., 81.
• Charney and Shukla (1981) Monsoon Dynamics:
predictability of monsoons, CUP
• Inness et al. (2001) Clim. Dyn., 17.
• Inness et al. (2003) J. Clim., 16.
• Lengaigne et al. (2004) Clim. Dyn., 23.
• Turner et al. (2005) Q. J. R. Meteorol. Soc., 131.(607)
• Vecchi and Harrison (2000) J. Clim., 31.