1) Design works used
step 1 (Delworth et al. 2006) presenting a restricted-frequency dynamical core (Lin 2004) which have a lateral resolution of about 2° latitude and you will twenty-four straight accounts. This new atmospheric model is actually coupled so you’re able to a slab sea having spatially consistent breadth. Five getup players with prescribed ocean https://datingranking.net/nl/swingstown-overzicht/ depths out-of 2.4, six, a dozen, twenty-four, and 50 yards is actually analyzed within study. New model are forced by seasonally varying insolation which have zero eccentricity and ° obliquity, and that’s focus on for 20 years, sufficient to gather into a stable climatology. The fresh new design climatology is extracted from the past 5 years out of this new integrations.
2) Results
The seasonal migration of the ITCZ off the equator has a larger amplitude for shallower ocean depths (Fig. 8) and PPenny 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 directory of precipitation centroid and you can atmospheric temperatures transportation along the equator regarding slab sea aquaplanet simulations with every simulator (water breadth) given by a unique colour. The brand new seasonal variety was twice the brand new amplitude of your yearly harmonic each and every variable plus the mountain of one’s line is the regression coefficient of your month-to-month studies. Brand new black asterisks are definitely the monthly observations additionally the strong black colored line is the seasonal variety of the observations. (bottom) Because the from the top, but also for precipitation centroid and you may warm SST gradient.
(top) Seasonal set of rain centroid and you will atmospheric temperature transportation across the equator in the slab ocean aquaplanet simulations with each simulator (water breadth) offered by an alternative colour. New seasonal range is double the amplitude of your annual harmonic of each and every changeable in addition to slope of range is the regression coefficient of monthly data. New black colored asterisks are the monthly findings while the good black colored line is the regular variety of the latest findings. (bottom) Given that in the most readily useful, however for rain centroid and you may tropical SST gradient.
(top) Seasonal listing of precipitation centroid and you can atmospheric heat transportation along side equator in the slab sea aquaplanet simulations with each simulator (water breadth) offered by another type of color. The latest seasonal diversity are twice this new amplitude of your annual harmonic of any adjustable as well as the mountain of your own range ‘s the regression coefficient of your month-to-month data. The fresh new black colored asterisks are the monthly findings as well as the good black range is the regular a number of the brand new findings. (bottom) Since the during the finest, but for rain centroid and you can warm 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.