DIMES stands for Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean. DIMES is a US/UK field program aimed at measuring diapycnal and isopycnal mixing in the Southern Ocean, along the tilting isopycnals of the Antarctic Circumpolar Current.
Schematic representation of Southern Ocean meridional overturning circulation. The isopycnal upwelling of Upper and Lower Circumpolar Deep Water (UCDW and LCDW, with sources in the North Atlantic) is supported by mean geostrophic mass fluxes below the level of topographic obstacles to the ACC and by mesoscale eddy-driven mass fluxes at mid-depth. The upwelled water changes density through air-sea-ice interaction. It then returns northward in the wind-driven Ekman layer to form Antarctic Intermediate Water (AAIW), and as Antarctic Bottom Water (AABW) in mean geostrophic flows. The magnitude of interior diapycnal mixing and the rate of along-isopycnal mixing are open for investigation and are the DIMES objectives.
DIMES includes tracer release, isopycnal following RAFOS floats, microstructure measurements, shearmeter floats, EM-APEX floats, a mooring array in Drake Passage, hydrographic observations, inverse modeling, and analysis of altimetry and numerical model output.
For more information, please visit the project webpage: DIMES Project
WHOI OML Participation
DIMES US2 TN246 on Thomas G. Thompson:
- Utilized both MMM VMP-5500 instruments, launched from WHOI HRP cradle assembly
- Tested 5 Rockland Scientific XMP Expendable Microstructure Profilers, sampled through a towed fish and ran through a fiber optic tether
- Provided technical support for Southhampton VMP-5500 operations
- Profiled with MMM VMP-5500 SN008 for 20 casts
DIMES UK3 on James Cook: