1) Design operates put
step one (Delworth et al Making Friends singles dating. 2006) offering a restricted-regularity dynamical center (Lin 2004) that have a horizontal quality of about 2° latitude and you may 24 vertical profile. This new atmospheric model try paired to a slab sea which have spatially uniform depth. Five getup members with recommended ocean deepness off dos.4, 6, 12, 24, and you may fifty meters was analyzed within this studies. The fresh design try pushed from the seasonally varying insolation that have no eccentricity and you will ° obliquity, and that is run to own 20 years, enough to converge on the a stable climatology. New model climatology is taken from the last five years of the fresh integrations.
2) Efficiency
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) Regular set of precipitation centroid and you may atmospheric temperatures transportation over the equator in the slab ocean aquaplanet simulations with every simulation (ocean breadth) offered by a separate colour. Brand new seasonal range is twice the newest amplitude of one’s yearly harmonic of every adjustable and also the slope of one’s range is the regression coefficient of monthly study. The brand new black colored asterisks is the month-to-month observations and good black colored line ’s the regular range of the observations. (bottom) Since the at better, however for rain centroid and you can exotic SST gradient.
(top) Regular list of precipitation centroid and you will atmospheric heat transport along side equator throughout the slab sea aquaplanet simulations with every simulation (water depth) offered by another colour. The fresh regular diversity try twice the new amplitude of annual harmonic of each variable and the slope of your own range ’s the regression coefficient of your monthly research. The fresh new black colored asterisks are definitely the monthly findings therefore the good black range ’s the seasonal selection of brand new observations. (bottom) While the from the most useful, but also for rain centroid and you may tropical SST gradient.
(top) Regular listing of precipitation centroid and atmospheric heat transport over the equator in the slab water aquaplanet simulations with each simulator (water depth) supplied by a different sort of colour. The new seasonal range was twice the newest amplitude of one’s yearly harmonic of any variable therefore the hill of one’s range is the regression coefficient of the monthly research. Brand new black asterisks will be monthly findings additionally the solid black colored line ’s the regular a number of the newest observations. (bottom) As on most useful, however for precipitation centroid and 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.