Articles | Volume 9, issue 4
https://doi.org/10.5194/amt-9-1685-2016
https://doi.org/10.5194/amt-9-1685-2016
Research article
 | 
15 Apr 2016
Research article |  | 15 Apr 2016

Interannual variability of temperature in the UTLS region over Ganges–Brahmaputra–Meghna river basin based on COSMIC GNSS RO data

Khandu, Joseph L. Awange, and Ehsan Forootan

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Ansari, M. I., Madan, R., and Bhaita, S.: Verification of quality of GPS based radiosonde data, Mausam, 66, 367–374, available at: metnet.imd.gov.in/mausamdocs/16632_F.pdf, 2015.
Anthes, R. A.: Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather, Atmos. Meas. Tech., 4, 1077–1103, https://doi.org/10.5194/amt-4-1077-2011, 2011.
Ashok, K. and Saji, N. H.: On the impacts of ENSO and Indian Ocean dipole events on sub-regional Indian summer monsoon rainfall, Nat. Hazards, 42, 273–285, https://doi.org/10.1007/s11069-006-9091-0, 2007.
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Short summary
Monthly accumulated COSMIC RO data is used to examine the interannual variability of UTLS temperature over the Ganges-Brahmaputra-Meghna river basin from 2006 to 2013. PCA analysis of tropopause temperatures and heights indicates that ENSO accounts for 73% of the interannual variability with a correlation of 0.77 with Niño3.4 index whereas the QBO explains about 10% of the variability. The tropopause temperature (height) increased (decreased) by about 1.5oC (300 m) during the 2009/2010 El Niño.
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