The QBO's influence on lightning production and deep convection in the tropics

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dc.contributor.advisor Schumacher , Courtney en_US
dc.contributor.committeeMember Bowman , Kenneth P . en_US
dc.creator Hernandez , Celina Anne en_US
dc.date.accessioned 2010 -01 -15T00 :06 :32Z
dc.date.accessioned 2014 -02 -19T19 :34 :22Z
dc.date.available 2010 -01 -15T00 :06 :32Z
dc.date.available 2014 -02 -19T19 :34 :22Z
dc.date.created 2008 -12 en_US
dc.date.issued 2009 -05 -15 en_US
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3106
dc.description.abstract Variations in characteristics of tropical deep convection are examined for an association with the stratospheric quasi -biennial oscillation (QBO ) . Eight years (1998 -2005 ) of Tropical Rainfall Measuring Mission (TRMM ) Lightning Imaging Sensor (LIS ) flash densities and ten years (1998 -2007 ) of TRMM Precipitation Radar (PR ) deep convective and stratiform rainfall and convective echo top heights are analyzed . The QBO can be linked to deep convection through two hypothesized mechanisms : 1 ) modulation of tropopause height , which may affect the altitude that convection can penetrate ; and 2 ) modulation of cross -tropopause shear , which may affect the vertical development of convection via shearing of cloud tops . Tropopause height and cross -tropopause shear is measured by National Centers for Environmental Prediction (NCEP ) reanalysis 100 hPa temperatures and 50 -200 hPa zonal wind shear , respectively . When partitioned by QBO east and west phases , zonal monthly mean anomalies and anomalous monthly mean difference maps illustrate a QBO signal in lightning flash rates , convective and stratiform rain amounts , and the number of convective echo tops > 12 km . QBO modulation of cross -tropopause shear causes 50 -200 hPa shear east (west ) phase anomalies to decrease (increase ) about the equator and increase (decrease ) in off -equator regions . QBO modulation of tropopause height induces a higher /colder (lower /warmer ) tropopause near the equator during the east (west ) phase . While the expectation was that decreases in cross -tropopause shear and tropopause temperatures at monthly time scales during the QBO would result in an increase of deep convective properties near the equator , observations suggest that deep convective properties may increase or decrease depending on the location and season . Similar to the QBO results , the increase or decrease of deep convective properties with general variations in cross -tropopause shear and tropopause temperatures depends on the location and season . en_US
dc.format.medium electronic en_US
dc.format.mimetype application /pdf en_US
dc.language.iso en _US en_US
dc.subject QBO en_US
dc.title The QBO's influence on lightning production and deep convection in the tropics en_US
dc.type Book en
dc.type.genre Electronic Thesis en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US

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The QBO's influence on lightning production and deep convection in the tropics. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3106 .

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