02 Oct The fresh new model integrations are executed toward Geophysical Liquid Figure Laboratory (GFDL) Atmospheric Model variation dos
1) Design works used
1 (Delworth ainsi que al. 2006) offering a small-frequency dynamical center (Lin 2004) having a horizontal quality of approximately dos° latitude and twenty-four vertical profile. The fresh new atmospheric design are paired to a good slab sea which have spatially consistent depth. Four ensemble professionals that have prescribed ocean depths of dos.4, 6, twelve, 24, and you may 50 yards are reviewed contained in this study. The new model are forced by seasonally differing insolation with no eccentricity and you will ° obliquity, that is focus on to possess two decades, sufficient to gather on a reliable climatology. The latest model climatology try extracted from the past five years from the brand 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 a number of precipitation centroid and you will atmospheric heat men looking for woman transport over the equator throughout the slab ocean aquaplanet simulations with every simulator (sea breadth) supplied by an alternative colour. The fresh seasonal assortment was twice brand new amplitude of your annual harmonic of every variable plus the slope of your own line ‘s the regression coefficient of your own monthly data. The latest black asterisks will be the month-to-month findings together with solid black colored range ‘s the seasonal listing of the new observations. (bottom) Due to the fact in the most readily useful, but also for precipitation centroid and warm SST gradient.
(top) Seasonal a number of precipitation centroid and you will atmospheric temperatures transportation along side equator in the slab ocean aquaplanet simulations with each simulation (sea breadth) offered by a new color. This new regular assortment was double the fresh amplitude of your yearly harmonic each and every variable as well as the mountain of the line ‘s the regression coefficient of the monthly research. The newest black asterisks may be the monthly observations therefore the solid black line is the regular selection of the latest observations. (bottom) Because in the greatest, however for precipitation centroid and tropical SST gradient.
(top) Regular a number of precipitation centroid and you will atmospheric temperatures transport along side equator on slab water aquaplanet simulations with every simulator (ocean breadth) given by a different colour. The newest seasonal variety are twice brand new amplitude of one’s yearly harmonic of every changeable as well as the slope of your range ‘s the regression coefficient of your monthly studies. The fresh new black asterisks will be month-to-month findings additionally the solid black colored line is the regular range of the brand new observations. (bottom) Since the in the best, but also for precipitation centroid and you can 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.