Rapid increase of carbon monoxide concentration in the tropical lower stratosphere during stratospheric sudden warming in January 2010
The January 2010 SSW event induced the lowest recorded LS temperature in MLS history (2004-13), which destabilized the TTL (Fig.1b) allowing an unprecedented clear detection of stratosphere-troposphere exchange process by way of CO, H2O and O3 intrusions. The present study suggests that short duration, overshooting clouds can have a large impact on the zonally averaged fields of LS composition.
Figure 1: (a) Heat flux (v'T') at 100 hPa, 45-75N from 10 January to 11 February in 2010. (b) Time-Pressure section of temperature tendency (dT/dt) averaged between 20S and equator. (c) Time-pressure section of carbon monoxide (CO) anomaly from the period mean at each pressure over the southern Africa (averaged between 22.5S and 2.5S for latitude and 12.5E and 42.5E for longitude). (d) Time-latitude section of zonal mean Outgoing Longwave Radiation (OLR). The vertical solid line indicates the onset date (20 January) of SSW in 2010.