2008), which will take ship and you will buoy measurements and you may provides an excellent gridded dataset within 2° solution using a maximum interpolation means. I use the climatological investigation determined ranging from 1981 and you can 2010. Since the a great metric into interhemispheric variation of warm SST, i calculate ?SST because the spatially weighted SST amongst the equator and you can 20°Letter without having the spatially adjusted SST amongst the equator and 20°S. step 1
(iii) Atmospheric temperatures transport along side equator
New atmospheric heat transport hails from the brand new National Locations having Ecological Anticipate (NCEP) four-times-each day reanalysis sphere (Kalnay et al. 1996) that have a beneficial (horizontal) spectral quality out of T62 and you may 17 vertical accounts. Brand new atmospheric temperature transportation is determined of the very first controlling new atmospheric bulk finances about reanalysis studies that have good barotropic cinch correction like in Trenberth (1997) and you will subsequently calculating the fresh new meridional flux from damp static energy 2 and vertically integrating. This technique is 
employed to help you write month-to-month averaged atmospheric temperature transportation of 1981 to help you 2010 and climatological mediocre over this era is used within studies.
We use longwave and shortwave radiative fluxes from the Clouds and Earth’s Radiant Energy System (CERES) experiment (Wielicki et al. 1996) to calculate ?SWABS? and ?OLR?. All calculations are performed separately for each of the four CERES instruments (FM1 and FM2 on Terra from 2000 to 2005 and FM3 and FM4 on Aqua from 2002 to 2005). We then average the results over the four instruments. The quantity ?STORatmos? is calculated as the finite difference of the vertically integrated temperature and specific humidity from the NCEP reanalysis climatology. As in Donohoe and Battisti (2013), ?SHF? is calculated as the residual of radiative heating, atmospheric storage, and the atmospheric heat transport divergence (from NCEP reanalysis).
The latest regular amplitude and you can phase found in our very own investigation is actually laid out given that amplitude and you may phase of yearly harmonic.
2) Abilities
A scatterplot of the monthly average PPenny versus AHTEQ and ?SST is shown in Fig. 3. The precipitation centroid varies from 5.3°S in February to 7.2°N in August and has an annual average of 1.65°N. This seasonal cycle of ITCZ location is slightly damped (equatorward) of other common metrics of ITCZ location (e.g., the latitude of maximum zonal mean precipitation, Xian and Miller 2008). It can be seen that PCent spends four months of the year in the Southern Hemisphere during the austral summer as the most intense precipitation is found in the South Pacific convergence zone at this time of year (not shown) and the zonal mean precipitation maximum moves to southern latitudes. We note that although the marine ITCZ defined in the eastern Pacific and Atlantic by Waliser and Gautier (1993) never moves south of the equator, the global ITCZ defined in the same study does move into the Southern Hemisphere and agrees very well with our precipitation centroid.
(top) Scatterplot of your seasonal cycle off warm precipitation centroid versus cross-equatorial atmospheric heat transport. For each and every cross is actually centered on the fresh new month-to-month average additionally the length of your own cross for each axis represents the latest 95% confidence interval assessed regarding the interannual variability. The fresh new filled package is the yearly mediocre. The dashed range ‘s the linear better complement towards month-to-month averages. (bottom) Because within greatest, but also for the new warm precipitation centroid versus the fresh interhemispheric difference in tropical SST.
(top) Scatterplot of your own regular duration off tropical rain centroid compared to get across-equatorial atmospheric temperature transport. Per cross is centered on the fresh month-to-month average while the duration of the cross for each axis represents the 95% believe period reviewed in the interannual variability. The fresh new filled container ‘s the yearly mediocre. Brand new dashed line is the linear better fit for the month-to-month averages. (bottom) Because the in the finest, but also for new tropical precipitation centroid vs the interhemispheric difference in exotic SST.