(Workshop on UTLS Asian Monsoon)
Some characteristics of the stratosphere-troposphere
dynamic coupling over the Tibetan Plateau region
REN RONGCAI ([email protected])
（LASG，Institute Of Atmospheric Physics, CAS）
（ Coauthors：X. Xia, SY Sun, GX Wu ）
Mar.8,2016
BACKGROUND AND
OBJECTIVES
 The UTLS transport over the Tibetan Plateau is
unique and crucial;
 It is largely determined by large scale dynamical
ST-TR coupling;
To prove from a climatological view:
 The unique UTLS dynamical ST-TR coupling surrounding
the Tibetan Plateau;
 The probably important role of ST-TR coupling during the
influence of TP on climate.
Over summer TP/IP: Warmer atmos. column,
higher tropopause,
unique thermodynamic conditions
TP
IP
W
Rocky
W
Paci
C
C
Meridional PV transport prevails
only on the east flank of TP/SAH
East flank of TP
Mid Pacific
Diff
Neg PVa
T
R
O
P
Warmer
Pos PVa
等熵面
PV
Shad：Meridional PV adv
Climatological PV, Theta, and the average meridional PV advection in July
Seasonal evolution of the tropopause, the 350K isentropic surface and PV transport along it
WE PROVED:
 The UTLS dynamical ST-TR coupling surrounding TP is
unique;
 The ST-TR coupling may play an important role during the
influence of TP on climate.
 Future work will examine interannual variability.
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