The two .pdf files on this page contain longitude-time Hovmuller diagrams of Temperature Deviation from
the NCEP Reanalysis and from GEOS-5 respectively.  Both files cover the region from -10 to 30 degrees
latitude in 10 degree increments at 3 different pressure levels in the TTL (150mb, 100mb, 70mb).  The
six ATTREX II science flights are plotted in magenta.

The NCEP Reanalysis plots were constructed as follows.  First we created an 11 year mean
3-D (longitude, latitude, pressure) temperature field for each winter day (December 1 - March 5)
by averaging over 12 days surrounding each day, over 11 years.  We then subtracted this on a daily
basis from the actual 6-hourly temperature fields for winter 2012-2013, followed by 1-4-6-4-1 binomial
filtering.  This has the effect of removing semidiurnal (and most diurnal) variation AND the seasonal
cycle from the fields.  The deviations are plotted in color, along with the negative deviations of
OLR (a measure of convection), at 3 different pressures and 7 different latitude ranges.

The GEOS-5 plots have the advantage of higher resolution (.3 degrees vs 2.5 degrees) and more recent
analysis techniques.  The dataset is shorter, however, so we simply subtraced the 2012-2013 winter
mean from the 6-hourly fields to come up with the deviations.

Some notes:

(1) The effect of the January stratospheric warming is very apparent at 70mb in the zonal mean plots
    at the right.
(2) The Reanalysis plots show that this winter is anomalously cold relative to the 11-year average.
(3) Eastward propagating Kelvin waves are apparent, but are clearly less strong in the eastern
    Pacific.
(4) You can see MJO events propgating westward at slower than the 10-20 m/s Kelvin wave speeds (more
    like 3-5 m/s) in the OLR, with 100mb negative temperature perturbations slightly preceding the
    OLR.  The MJO related temperature perturbations do not get into the eastern Pacific.