1) Model runs put
step 1 (Delworth mais aussi al. 2006) presenting a small-volume dynamical center (Lin 2004) with a horizontal quality around dos° latitude and twenty-four vertical profile. This new atmospheric model is combined so you’re able to an excellent slab water which have spatially uniform depth. Four getup members that have given ocean depths off dos.4, six, blackchristianpeoplemeet-promotiecode several, 24, and you can fifty meters is actually examined inside study. The design try pushed because of the seasonally different insolation which have zero eccentricity and you will ° obliquity, and is work at to have twenty years, sufficient to converge for the a constant climatology. The design climatology is taken from the past 5 years from new integrations.
The seasonal migration of the ITCZ off the equator has a larger amplitude for shallower ocean depths (Fig. 8) and PCent reaches as far as 21° in the 2.4-m slab depth run as compared to 3° in the 50-m slab depth run. This behavior is expected because the adjustment time scale of a 50-m-deep ocean to solar heating is on the order of one year (Donohoe 2011) as compared to weeks for 2.4-m-deep ocean. Thus, the SSTs barely adjust to the seasonally varying insolation in the 50-m run while the maximum SST moves seasonally with the insolation in the 2.4-m run.
(top) Seasonal set of rain centroid and you can atmospheric temperatures transport along side equator about slab ocean aquaplanet simulations with every simulation (water breadth) offered by a new colour. This new regular assortment try double new amplitude of annual harmonic of each changeable therefore the slope of your own range ‘s the regression coefficient of the month-to-month study. The newest black colored asterisks would be the monthly findings and good black colored line ‘s the seasonal listing of the fresh new observations. (bottom) Given that on better, but also for rain centroid and you can tropical SST gradient.
(top) Seasonal directory of rain centroid and you may atmospheric temperature transportation over the equator from the slab sea aquaplanet simulations with every simulator (ocean breadth) given by a special color. The newest regular variety was twice the latest amplitude of your own yearly harmonic of each and every adjustable as well as the slope of your own range ‘s the regression coefficient of the monthly study. Brand new black asterisks could be the month-to-month findings plus the solid black range is the seasonal a number of the fresh new findings. (bottom) Because the at the most readily useful, but for rain centroid and you will exotic SST gradient.
(top) Regular range of precipitation centroid and you will atmospheric temperature transport along side equator on slab water aquaplanet simulations with each simulation (water depth) given by another type of colour. The fresh regular assortment was twice this new amplitude of your yearly harmonic of each and every changeable plus the slope of your own range ‘s the regression coefficient of your own monthly studies. The brand new black colored asterisks could be the month-to-month findings while the solid black colored line ‘s the seasonal listing of new observations. (bottom) Given that at ideal, but for rain centroid and you will exotic SST gradient.
The seasonal amplitude of AHTEQ also decreases with increasing ocean depth, from 11.6 PW in the 2.4-m run to 0.5 PW in the 50-m run. In the shallow ocean run, the SSTs respond rapidly to the seasonally varying insolation, heating up over the summer hemisphere and subsequently fluxing energy upward (via turbulent and longwave fluxes) to the adjacent atmosphere to drive seasonal variations in AHTEQ; in the 2.4-m run ?SHF? is nearly in phase with the insolation (11-day lag) and has a seasonal amplitude of 11.6 PW. In contrast, the solar heating of the ocean makes a minimal impact on ocean temperatures in the deep ocean runs due to the large heat capacity of the ocean. In fact, SWABS is the only source of seasonal atmospheric heating in the 50-m run and the atmosphere loses energy to the ocean during the warm season; in the 50-m run ?SHF? is nearly antiphased with the insolation (192-day lag) and has a seasonal amplitude of 3.7 PW.