1) Design runs used
1 (Delworth et al. 2006) presenting a restricted-volume dynamical core (Lin 2004) having a horizontal quality of around dos° latitude and you can 24 vertical levels. The newest atmospheric model is paired so you’re able to a good slab sea which have spatially uniform depth. Five dress members having prescribed water deepness regarding dos.cuatro, six, 12, twenty four, and fifty meters is actually examined within investigation. New model are pressed of the seasonally varying insolation with zero eccentricity and you will ° obliquity, which is focus on getting two decades, adequate to gather into the a steady climatology. Brand new design climatology is extracted from the past 5 years away from the brand new integrations.
2) Abilities
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, https://datingranking.net/sapiosexual-dating/ 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 rain centroid and atmospheric heat transport across the equator on the slab ocean aquaplanet simulations with each simulator (ocean breadth) provided by a unique colour. The fresh new regular range was twice the newest amplitude of annual harmonic of each and every varying and slope of the line ‘s the regression coefficient of one’s monthly data. The latest black colored asterisks will be monthly observations and also the solid black colored line ‘s the regular selection of the findings. (bottom) Because the on finest, but also for precipitation centroid and tropical SST gradient.
(top) Regular variety of rain centroid and you may atmospheric temperatures transportation along side equator regarding slab ocean aquaplanet simulations with every simulator (water breadth) given by a different color. The brand new seasonal range are twice new amplitude of the annual harmonic of each adjustable while the slope of the range is the regression coefficient of monthly data. The latest black asterisks may be the month-to-month observations in addition to good black line is the regular a number of new observations. (bottom) As the at the better, however for rain centroid and exotic SST gradient.
(top) Seasonal a number of precipitation centroid and you can atmospheric temperatures transport across the equator on the slab sea aquaplanet simulations with each simulator (sea breadth) offered by a different color. The fresh new seasonal range is actually twice the fresh new amplitude of yearly harmonic of each variable and also the hill of the range ‘s the regression coefficient of your monthly study. The fresh new black asterisks will be month-to-month findings and the strong black range is the seasonal directory of the latest observations. (bottom) As the at the most useful, but for precipitation centroid and you may tropical 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.
