1) Model works made use of
step one (Delworth ainsi que al. 2006) presenting a small-regularity dynamical center (Lin 2004) that have a lateral quality of around dos° latitude and you can twenty-four straight accounts. The brand new atmospheric design is paired so you’re able to a good slab sea having spatially consistent depth. Four dress people having recommended ocean deepness from 2.cuatro, six, twelve, 24, and you may fifty meters is actually examined within this studies. The fresh new design was pushed by seasonally different insolation that have zero eccentricity and ° obliquity, and is manage getting 20 years, adequate to gather on a reliable climatology. The brand new model climatology are taken from the very last 5 years of the latest 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) Regular set of rain centroid and atmospheric temperature transportation along side equator from the slab water aquaplanet simulations with every simulator (ocean breadth) provided by an alternative colour. The latest seasonal assortment try double new amplitude of the annual harmonic of each and every variable therefore the slope of the line ‘s the regression coefficient of your own monthly study. The fresh new black asterisks will be the month-to-month findings plus the solid black line ‘s the regular a number of the new findings. (bottom) Just like the at greatest, but for rain centroid and tropical SST gradient.
(top) Regular range of rain centroid and you may atmospheric heat transport over the equator throughout the slab sea aquaplanet simulations with every simulation (ocean depth) given by an alternate colour. The regular range try twice this new amplitude of the yearly harmonic of each and every variable and the slope of your own range ‘s the regression coefficient of your monthly investigation. The latest black colored asterisks would be the monthly findings while the good black colored range ‘s the seasonal a number of the fresh findings. (bottom) Once the from the ideal, however for rain centroid and you will warm SST gradient.
(top) Seasonal listing of rain centroid and you will atmospheric heat transport along side equator on the slab water aquaplanet simulations with each simulator (water breadth) provided by a new color. This new regular diversity was double the new amplitude of your yearly harmonic of each and every adjustable and also the slope of the line is the regression coefficient of one’s month-to-month analysis. The newest black colored asterisks will be month-to-month observations additionally the good black range ‘s the regular list of the findings. (bottom) Given that from the most useful, however for rain centroid and you will warm SST https://datingranking.net/black-hookup-apps/ 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.
