Page 28: of Marine Technology Magazine (October 2018)

Ocean Dipole). Exposing the details of this subtle climate connection was

Exposing the details of this subtle climate connection was possible due to the long duration of the data set. Notably, a lag possible due to the long duration of the data set. Notably, a lag of almost 12 months was found between changes in the IOD of almost 12 months was found between changes in the IOD climate index and corresponding variation in water volumes climate index and corresponding variation in water volumes supplied to the Agulhas Current.

supplied to the Agulhas Current. This validation with the moored measurements was essen-

For seasonal periods, modest changes in ? ow volumes were tial for the scientists to be able to use the altimeter data as a linked to wind-stress patterns over the Indian Ocean basin. 20-year index of the Current’s transport. This index offered a

At interannual time scales, changes much larger than sea- much longer record for examining seasonal and interannual sonal variations were found. These swings in volume trans- changes in the Current. port were attributed to large-scale climate ? uctuations. The Of signi? cance was the response of the Agulhas to intensify- latter are identi? ed by a regional climate index—IOD (Indian ing global wind patterns since the 1990s. The mean ? ow of

Ocean Dipole). the Agulhas has not increased. This ? nding is at odds with

Fig. 3

A later setting of LOCO moorings in Mozambique Channel. ADCP pro? les are indicated.

Scales: depth (m), distance(km).

Adapted from H. Ridderinkhof et al. (NIOZ) 2010. https://doi.org/10.1029/2009JC005619

October 2018 28 MTR

MTR #8 (18-33).indd 28 MTR #8 (18-33).indd 28 9/26/2018 4:13:52 PM9/26/2018 4:13:52 PM