I use the Offered Rebuilt Ocean Surface Heat (ERSST) research out of Reynolds and Smith (1994), version 3b (Smith et al

I use the Offered Rebuilt Ocean Surface Heat (ERSST) research out of Reynolds and Smith (1994), version 3b (Smith et al

2008), which will take ship and buoy specifications and supplies a gridded dataset at the dos° solution using a max interpolation approach. We make use of the climatological study determined between 1981 and you can 2010. While the an effective metric into interhemispheric improvement out-of warm SST, we estimate ?SST given that spatially weighted SST between the equator and you may 20°N without having the spatially adjusted SST amongst the equator and 20°S. 1

(iii) Atmospheric temperature transport over the equator

The latest atmospheric temperatures transportation comes from the fresh Federal Locations having Ecological Prediction (NCEP) four-times-every single day reanalysis sphere (Kalnay mais aussi al. 1996) having an excellent (horizontal) spectral resolution out-of T62 and 17 vertical account. The brand new atmospheric heat transport is actually computed because of the basic balancing the atmospheric bulk funds from the reanalysis research which have good barotropic breeze modification as in Trenberth (1997) and you may subsequently calculating http://www.hookupdaddy.net/college-hookup-apps/ new meridional flux out-of moist static time 2 and vertically partnering. This technique is employed so you can create monthly averaged atmospheric temperatures transport regarding 1981 so you’re able to 2010 additionally the climatological mediocre more than this era is employed within this data.

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 fresh seasonal amplitude and you can phase used in all of our data is actually discussed while the amplitude and you will stage of your yearly harmonic.

2) Abilities

A scatterplot of the monthly average PCent 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 PPenny 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 of exotic rain centroid against mix-equatorial atmospheric temperatures transport. For each and every get across is according to the month-to-month average together with duration of the mix on each axis stands for the brand new 95% depend on interval analyzed on the interannual variability. The new filled box is the annual mediocre. The fresh new dashed range is the linear ideal complement towards the monthly averages. (bottom) Since the within best, however for new exotic rain centroid vs the new interhemispheric difference in warm SST.

(top) Scatterplot of your seasonal stage out-of tropical precipitation centroid vs cross-equatorial atmospheric temperature transport. Each mix try according to the brand new month-to-month average and also the length of one’s mix on every axis means the latest 95% believe interval reviewed about interannual variability. This new occupied container is the annual mediocre. The dashed line ‘s the linear finest fit on the month-to-month averages. (bottom) Given that at greatest, however for brand new exotic precipitation centroid vs brand new interhemispheric difference in exotic SST.

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