From correspondent Gras Albert:
AMSU's global temperature web page, if accurate, is showing an abrupt climate change event, Channel 5 (600mb, 14,000ft) is showing a 0.8degC drop in global average temperature in just 9 days. This is remarkable, not repeated anywhere in the satellite record, let alone in March which is typically a warming month.
Similar, though not quite so severe drops are shown in Channel 6 (400mb, 25,000ft) and 7 (250mb, 36,000ft) indicating that it is troposphere deep, perhaps a Super Tropospherical Cooling event!
Although as my correspondent continues, it could just be a problem with the satellite. Here's the image. The AMSU page is here.