We use the Lengthened Reconstructed Ocean Skin Heat (ERSST) data from Reynolds and you will Smith (1994), type 3b (Smith mais aussi al

2008), which takes motorboat and you can buoy specifications and produces an excellent gridded dataset at 2° quality having fun with a max interpolation strategy. I make use of the climatological investigation determined between 1981 and you will 2010. Due to the fact a metric into the interhemispheric difference of exotic SST, we determine ?SST given that spatially weighted SST between the equator and 20°N without spatially weighted SST within equator and 20°S. step one

(iii) Atmospheric heat transportation across the equator

This new atmospheric heat transport is derived from new National Centers having Environment Anticipate (NCEP) four-times-each day reanalysis areas (Kalnay et al. 1996) that have a beneficial (horizontal) spectral resolution away from T62 and 17 vertical account. The fresh atmospheric temperatures transport are computed from the earliest balancing the newest atmospheric size budget regarding the reanalysis research having a beneficial barotropic piece of cake modification as in Trenberth (1997) and you may next calculating the meridional flux away from damp fixed opportunity 2 and you may http://datingranking.net/best-hookup-apps/ vertically partnering. This procedure is utilized in order to create monthly averaged atmospheric temperature transportation from 1981 in order to 2010 and also the climatological mediocre over this period is utilized inside research.

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 ?STOR_atmos? 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 brand new seasonal amplitude and you can phase utilized in the study is defined due to the fact amplitude and you may phase of one’s annual harmonic.

2) Results

A scatterplot of the monthly average P_Penny versus AHT_EQ 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 P_Cent 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 own regular stage out of exotic rain centroid against mix-equatorial atmospheric temperatures transportation. Each get across try considering the fresh month-to-month mediocre and size of get across on each axis means the brand new 95% rely on interval reviewed regarding interannual variability. New filled package is the yearly mediocre. The fresh dashed range ‘s the linear most readily useful fit with the monthly averages. (bottom) Since at better, however for this new warm precipitation centroid versus new interhemispheric difference between warm SST.

(top) Scatterplot of your own regular duration of tropical precipitation centroid compared to cross-equatorial atmospheric temperature transportation. For each get across try based on the latest monthly mediocre plus the length of the mix on each axis represents the 95% believe interval reviewed about interannual variability. The fresh new filled container is the annual average. Brand new dashed line is the linear most useful complement on the monthly averages. (bottom) Because the from the most useful, however for the new exotic precipitation centroid versus this new interhemispheric difference between warm SST.