Relationship between the tropical tropopause and tropical easterly jet
streams over Indian monsoon region
This paper presents the first quantitative relationship between the cold
point tropopause (CPT) and tropical easterly jet (TEJ) using radiosonde
observations over Gadanki (13.45oN, 79.2oE) during the Indian summer
monsoon season 2006–2014. CPT and TEJ peak altitudes (H_CPT and
H_TEJ) show amalgams of two categories of variability on day to day
scale. In category1 H_TEJ occurs close to H_CPT and they show in phase
variation. While in category2 H_TEJ occurs far apart from H_CPT and
they do not show any relationship. For category1 H_CPT and H_TEJ are
strongly correlated (0.70) as well as H_CPT and T_CPT (CPT
temperature) are moderately anticorrelated (-0.55) significant at 95%
confidence level indicating the dominance of adiabatic processes.
Whereas in category2 H_CPT and T_CPT are not significantly
anticorrelated. Thus, when TEJ and CPT are close to each other it may
serve as an indicator for the prevalence of synoptic-scale effect.