Brand new model integrations are carried out into the Geophysical Water Figure Laboratory (GFDL) Atmospheric Design version dos

1) Model works used

step 1 (Delworth ainsi que al. 2006) offering a restricted-regularity dynamical center (Lin 2004) having a lateral resolution of around 2° latitude and you can twenty-four vertical account. The brand new atmospheric model is combined in order to a beneficial slab ocean that have spatially uniform depth. Four getup people that have given sea deepness regarding 2.cuatro, six, a dozen, 24, and you will 50 yards is assessed within investigation. The fresh model is actually pressed by seasonally differing insolation that have zero eccentricity and you can ° obliquity, and that is manage getting 20 years, enough to gather to your a reliable climatology. The fresh model climatology is actually taken from the past five years regarding the fresh new integrations.

2) Show

The seasonal migration of the ITCZ off the equator has a larger amplitude for shallower ocean depths (Fig. 8) and P_Cent 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 directory of precipitation centroid and atmospheric temperature transport across the equator from the slab water aquaplanet simulations with every simulation (ocean depth) supplied by a separate color. The fresh regular range is actually double the amplitude of your own annual harmonic of any varying and the mountain of range ‘s the regression coefficient of your month-to-month investigation. This new black asterisks is the monthly findings and also the strong black colored range ‘s the regular list of the fresh new findings. (bottom) Due to the fact at most readily useful, but for rain centroid and you may warm SST gradient.

(top) Regular selection of rain centroid and you can atmospheric temperatures transport across the equator regarding the slab water aquaplanet simulations with every simulation (sea depth) given by another type of colour. Brand new regular range try double the new amplitude of one’s annual harmonic of any variable and the hill of one’s range ‘s the regression coefficient of the monthly investigation. The black asterisks would be the monthly observations and good black range is the seasonal range of the observations. (bottom) Because the in the best, however for precipitation centroid and you will tropical SST gradient.

(top) Regular range of precipitation centroid and you will atmospheric temperatures transport along the equator on the slab ocean aquaplanet simulations with each simulator (ocean breadth) offered by yet another colour. This new regular diversity is double the newest amplitude of one’s annual harmonic of every changeable additionally the hill of your range is the regression coefficient of one’s month-to-month investigation. The new black colored asterisks will be the month-to-month findings in addition to solid black range is the regular directory of the latest observations. (bottom) Because the at the finest, but also for rain centroid and you can exotic SST gradient.

The seasonal amplitude of AHT_EQ 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 AHT_EQ; 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 hookup sites like craigslist 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.

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