Observational evidence of deep convection over Indonesian sector in relation with major stratospheric warming events of 2003-04 and 2005-06

Details Observational evidence of deep convection over Indonesian sector in relation with major stratospheric warming events of 2003-04 and 2005-06 Observational evidence of deep convection over Indonesian sector in relation with major stratospheric warming events of 2003-04 and 2005-06

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73.2453s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 17, p. 2453-2461.

Physics

Scientific paper

The major sudden stratospheric warming (SSW) events of 2003-04 and 2005-06 are considered to investigate changes in equatorial convection due to circulation changes associated with the SSW events. It is observed that the SSW events are accompanied by a considerable decrease in Outgoing Longwave Radiation (OLR), a proxy for tropical convection, over equatorial latitudes (15°N-15°S) in the Indonesian sector (90°E-150°E). However, unlike noted by earlier observations, the zonal mean OLR does not show any notable relationship with the SSW events. It can be explained from the latitude-longitude map of potential vorticity (PV) at 100 hPa, which shows a tongue of high PV emanating from high latitudes towards equator and converges in the longitude band of 90°E-150°E on the day of peak warming at 1 hPa in the case of 2003-04 and 10 hPa in the case of 2005-06. The latitude-height map of Eliassen-Palm (EP) vector and its divergence show convergence of EP flux in the upper troposphere at latitudes even lower than 20°N on these days. Further, vertical winds computed from the convergence of momentum flux are upward indicating convective activity at low-latitudes and downward at mid-latitudes.

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