EOF analysis of COSMIC observations on the global zonal mean temperature structure of the Upper Troposphere and Lower Stratosphere from 2007 to 2013

Cornelius Csar Jude H. Salinas, Loren C. Chang

Research output: Contribution to journalArticlepeer-review

Abstract

This work presents the results of a Conventional Empirical Orthogonal Function Analysis on daily global zonal mean temperature profiles in the Upper Troposphere and Lower Stratosphere (15–35 km), as measured by the FORMOSAT-3/COSMIC mission from January 2007 to June 2013. For validation, results were compared with ERA-Interim reanalysis. Results show that, the leading global EOF mode (27%) from COSMIC is consistent with temperature anomalies due to the tropical cooling associated with boreal winter Sudden Stratospheric Warmings (SSW). The second global EOF mode from COSMIC (15.3%) is consistent with temperature anomalies due to the Quasi-biennial Oscillation (QBO). The third global mode from COSMIC (10.9%) is consistent with temperature anomalies due to the El Nino Southern Oscillation. This work also shows that the second northern hemisphere EOF mode from COSMIC (16.8%) is consistent with temperature anomalies due Rossby-wave breaking (RWB) which is expected to only be resolved by a high vertical and temporal resolution dataset like COSMIC. Our work concludes that the use of a high vertical and temporal resolution dataset like COSMIC yields non-seasonal EOF modes that are consistent with relatively more intricate temperature anomalies due to the SSW, QBO, ENSO and RWB.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume171
DOIs
StatePublished - Jun 2018

Keywords

  • Brewer-Dobson Circulation
  • El Nino Southern Oscillation
  • GPS RO
  • Quasi-biennial Oscillation
  • Stationary planetary waves
  • Sudden Stratospheric Warming
  • Upper Troposphere Lower Stratosphere

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