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000006242 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000006242 1001_ $$0P:(DE-HGF)0$$aHeyes, W.J.$$b0
000006242 245__ $$aComposition of the TTL over Darwin: local mixing or long-range transport?
000006242 260__ $$aKatlenburg-Lindau$$bEGU$$c2009
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000006242 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v9$$x1680-7316
000006242 500__ $$aWe thank the pilots and ground crew of the Egrett and Dornier aircraft for ensuring a successful campaign, and to Peter May and the staff of the Bureau of Meteorology (BoM) Regional Centre in Darwin for their support in forecasting and logistics. We thank also the staff of the BoM radiosonde station, Darwin, for their support of the ozonesonde programme, Marcel Berg and Norbert Houben for maintenance of the CO instrument, and the Royal Australian Air Force for hosting the aircraft experiment. Finally, we thank the UK Natural Environment Research Council (Grant NE/C512688/1) and NERC Airborne Remote Sensing Facility for supporting ACTIVE. WH is a NERC-supported research student.
000006242 520__ $$aWe present ozone and carbon monoxide measurements taken in Darwin, Australia, during the wet season of 2005/2006, to examine whether the composition of the Tropical Tropopause Layer (TTL) reflects that of the local boundary layer or is influenced more by advection from distant sources. We find that the latter predominates in the upper TTL, and is also the major influence in the lower TTL, except during an active monsoon phase. The day-to-day variability of ozone in the TTL is far greater than that in the lower troposphere, and correlates closely with air mass origin deduced from trajectory calculations based on standard ECMWF wind analyses. Although clear evidence of recent local uplift was found in carbon monoxide tracer measurements recorded inside convective anvils, no such signal was found out-of-cloud in the background TTL, where the measured variability correlated well with air mass origin deduced from back-trajectories. This study suggests that the composition of the TTL is ultimately determined by vertical mixing in certain "hot spot" regions of the tropics, with advection from these regions dominating the composition elsewhere.
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000006242 7001_ $$0P:(DE-HGF)0$$aVaughan, G.$$b1
000006242 7001_ $$0P:(DE-HGF)0$$aAllen, G.$$b2
000006242 7001_ $$0P:(DE-Juel1)6742$$aVolz-Thomas, A.$$b3$$uFZJ
000006242 7001_ $$0P:(DE-Juel1)16214$$aPätz, H.-W.$$b4$$uFZJ
000006242 7001_ $$0P:(DE-HGF)0$$aBusen, R.$$b5
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