For deep convective clouds, relative differences in convective cloud cover between the QBO easterly and QBO westerly phases can be as large as 51%±7% of the annual average over isolated regions in the tropical west Pacific and 103%±35% over the east Pacific, where the absolute values are lower and where notable deviations occur during the QBO westerly phase.
Inspired by these results, more recent work includes a composite analysis of 50-hPa geopotential height anomalies In the Southern Hemisphere, between the Tasman Sea and the Southern Ocean, which suggests a teleconnection pattern between these regions in the lower stratosphere during southern fall and winter that is present throughout the year in the troposphere. In the stratosphere, the northern center is missing in southern spring, and the southern center is not significant in summer. These geopotential height anomalies indicate a vertically coherent zonal wind anomaly pattern that can extend from Earth's surface upward into the lower stratosphere. At 50 hPa, the strongest positive geopotential height anomalies are found north of the Ross Sea and Bellingshausen Sea during summer and fall. These anomalies might lead to a tripolar pattern in fall and the above teleconnection pattern in winter. However, the polar vortex is strongest in midwinter and thus is less prone to zonal anomalies in geopotential height.
The significant correlation at 50 hPa during fall indicates the presence of the teleconnection during this season with a positive peak in 50-hPa geopotential height anomaly over southern Australia and a negative peak northwest of the Ross Sea. In the troposphere and the lower stratosphere, the SAM has a regional peak to the east of this teleconnection. However, the stratosphere–troposphere coupling suggests that both the SAM and this teleconnection are triggered by a stratospheric signal.
In the Northern Hemisphere, a stratospheric signal over northwestern Russia generates a tropospheric wave train through Central Asia that influences the west Pacific warm pool and thus the ENSO signal. The above results are also discussed with regards to their impact on regional precipitation patterns and thus the general hydrologic cycle, since the positive phase of the teleconnection in the Southern Hemisphere is suggested to lead to longterm droughts over Australia and the wave train over Central Asia severely impacts the hydrologic response to the ENSO signal.
Furthermore, this presentation will provide an overview of the SPARC Data Center including previous hardware upgrades and an update on the current status and progress on the migration from Stony Brook University to CEDA.