Impact of quasi-biennial oscillation on the inter-annual variability of the tropopause height and temperature in the tropics: A study using COSMIC/FORMOSAT-3 observations

AMS Citation:
Kumar, V., and Coauthors, 2014: Impact of quasi-biennial oscillation on the inter-annual variability of the tropopause height and temperature in the tropics: A study using COSMIC/FORMOSAT-3 observations. Atmospheric Research, 139, 62-70, doi:10.1016/j.atmosres.2013.12.014.
Date:2014-03-15
Resource Type:article
Title:Impact of quasi-biennial oscillation on the inter-annual variability of the tropopause height and temperature in the tropics: A study using COSMIC/FORMOSAT-3 observations
Abstract: The effect of quasi-biennial oscillation (QBO) on the temperature of cold point tropopause (T-CPT) and its height (H-CPT) is being investigated using radio occultation measurements by COSMIC/FORMOSAT-3. Observations comprising of 935,863 numbers of occultations have been used to study the zonal mean seasonal variability in T-CPT and H-CPT from January 2007 to December 2011. Results are shown over 30°N–30°S geographic latitudes. In general, T-CPT is found to be the coldest in February and the warmest in August. H-CPT attains maximum height during December–February and minimum during July–August. Interestingly, H-CPT shows maxima at off-equator region (around 20°N or 20°S) during all the seasons in both hemispheres. H-CPT at off-equatorial region, in reference to the equatorial region, is slightly higher (~ 1.0 km) during winter as compared to monsoon season (~ 0.5 km) in Northern Hemisphere (NH). Inter-annual variation in T-CPT and H-CPT found to be clearly influenced by the QBO. Westerly (easterly) phase generates warm (cold) T-CPT, which consequently results a decrease (increase) in H-CPT. It is concluded that QBO induces the changes in T-CPT by as much as 2 °C and in H-CPT by 0.5 km.
Peer Review:Refereed
Copyright Information:Copyright 2014 Elsevier.
OpenSky citable URL: ark:/85065/d71c1xtj
Publisher's Version: 10.1016/j.atmosres.2013.12.014
Author(s):
  • V. Kumar
  • S. Dhaka
  • K. Reddy
  • A. Gupta
  • S. Surendra Prasad
  • V. Panwar
  • Narendra Singh
  • Shu-peng Ho - NCAR/UCAR
  • M. Takahashi
  • Random Profile

    SOFT ENG/PROG IV

    Recent & Upcoming Visitors