Equatorial Pacific Ocean Temperature Changes During 5 Tg Black Carbon Injection

Cross-section plots of the equatorial Pacific ocean temperatures anomalies, zonal, and vertical velocities are shown below for the nw_cntrl_03m02 control run and nw_targets_01m02 5 Tg black carbon injection. Temperature anomalies are calculated using a climatology from years 0005-0021 of nw_cntrl_03m02. There is a slight trend in Ocean Heat Content (OHC) in the equatorial Pacific but I don't think it's large enough to impact what these plots illustrate. What is clear is that there is a warm temperature anomaly in the Western Pacific Warm Pool at depth at the beginning of nw_cntrl_03m02 and nw_targets_01m02, which is priming nw_targets_01m02 for an El Nino after cooling from the stratospheric black carbon injection triggers a Westerly Wind Burst (WWB) in the Western Pacific.

An El Nino does develop in nw_cntrl_03m02, as warmer waters make it to the surface during the autumn of year 0005, like in the nw_targets_01m02 case. There are favorable westerly wind anomalies in nw_cntrl_03m02 that promote El Nino development, but the westerly wind anomalies are stronger in the 5 Tg black carbon injection case. The El Nino that develops is of a greater magnitude in the 5 Tg black carbon injection run compared to the control run, when looking at the amount of anomalous warm water in the equatorial eastern Pacific.

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