Observational evidence of the relationship between the tropical tropopause and tropical easterly jet streams over the 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 (13.45° N, 79.2° E) during the Indian summer monsoon season 2006–2014. CPT and TEJ peak altitudes (HCPTandHTEJ) show amalgams of two categories of variability on the day‐to‐day scale. In category1 HTEJ occurs close to HCPT and they show in‐phase variation. While in Category2 HTEJ occurs far apart from HCPT and they do not show any relationship. For Category1 HCPT and HTEJ are strongly correlated (0.70), as well as HCPT and TCPT (CPT temperature) are moderately anticorrelated (−0.55) significant at a 95% confidence level, indicating the dominance of adiabatic processes. Whereas in Category2 HCPT and TCPT are not significantly anti‐correlated. Thus, when TEJ and CPT are close to each other, it may serve as an indicator for the prevalence of the synoptic‐scale effect. Typical temperature and zonal wind profiles showing (a‐b) sharp tropopause and TEJ observed on July 2, 2006. (c) Time series of HCPT and HTEJ during June–August 2006. Report on the plausible relationship between tropical tropopause and tropical easterly jet (TEJ) streams using radiosonde observations. Cold point tropopause altitude and temperature are driven by adiabatic processes when TEJ core lies in the vicinity of tropical tropopause. It indicates that the TEJ plays a vital role in tropical tropopause variability, which needs to be considered.