chia chou environmental change research project institute of earth sciences
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Establishment of the low-level wind anomalies over the
western North Pacific during ENSO development
Chia Chou
Environmental Change Research Project Institute of Earth Sciences Academia Sinica, Taiwan
― Establishment
― Eastward movement
Intermediate complexity climate model QTCM
(Quasi-equilibrium Tropical Circulation Model)
― constrained by quasi-equilibrium thermodynamic
closures, such as Betts-Miller convective scheme
― simple land surface model: moisture and energy
budget in one surface layer
Forced by prescribed ENSO SST
1'
1 v'')(vv Mg
pTFTq
g
pTM
g
pT net
)( hM p
),,(v)(),,,( 1 txptpx yy
HERRRSSSSF sstssttnet
Gross moist stability (Yu et al. 1998)
)'v)''(v')(v qTqTqT
• Mechanism of the establishment:
– the horizontal advection of moist static
energy
– local SST anomalies
• Eastward movement:
– winter monsoon flow coupled with atmo. T 4
induced by ENSO
– mean q and T coupled with wind anomalies
over the WNP
Conclusions
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