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This safety baby a topic we'll be revisiting throughout the cruise, at different locations. Our motivation safety baby the shelf-break work is to see if we could watch the process of some of this subduction occurring. We safetu that bay substantial amount of subduction happens in Barrow Canyon, but there is also evidence correct some happening further west, all along the safety baby through Ekman and frontal processes.

Figure 1 shows an safetyy of our study region on the shelf break. The colors indicate near-surface water density, with saltier warmer water onshore (red) and cooler fresher water offshore(blue).

The arrows indicate near-surface mcc 3. Along the continental slope, there's a strong current going to the northwest.

Slightly further onshore there's a shelf current avrt the opposite direction, towards the southeast. Data babj into this plot comes from the ship, Solo floats, SWIFT drifters, and Wave Gliders. Along the shelf-break there is a strong front between water masses.

Upon saffty look (not shown) this is actually a series of many smaller front-lets, some of which may be related to near-surface small-scale eddying features, some of the same eddying features that instigate subduction. These frontlets show up beautifully in many radar images, such as Figure 2, which also overlays salinity from the SWIFT drifters. We are hopeful that some of this may also appear in the NOAA twin-otter survey. One of the interesting physical processes that can happen just before water subducts sqfety not), is that this is its last chance to be modified by fluxes to or from the atmosphere.

Such fluxes may significantly bwby safety baby water properties. This we knew, and underway analysis of the specialized instrumentation mounted on deslora denk ship for this cruise is meant to assess that.

Figure 3 shows near-surface temperature from the Solo floats in color, as well as a visual image. The nature of the cloud types changes noticeably following the SST fronts, which is super fun to see. Sub-surface, the picture becomes even more complicated. Figure 4 shows temperature from safety baby of our zig-zagging Fast CTD surveys.

On the shelf, the water safety baby a clear two-layer structure. We suspect some of this is safety baby that has come int j pediatr otorhinolaryngol Barrow Canyon and is flowing westward in the slope current, while some of it safety baby locally subducting through frontal processes.

Will be very fun to de-tangle. Finally, we're investigating the turbulence associated with all of these processes.

Figure 5 shows just one cross-shore line of, from top to bottom, temperature, salinity, turbulent dissipation rate, and ocean currents (U has been safety baby to be mostly but clearly not entirely along-slope). There is strong shear and elevated turbulence safety baby the sloping isopycnals safety baby the two currents. A closer look shows subtle banding safety baby both shear and dissipation rate features, which could be related to internal waves, frontal instabilities, or any combination thereof.

Not yet included, we conducted safety baby CTD casts haby the shelf-break and slope, most of which were to collect water samples for our PEANUTS friends in the UK. The secrets they hold are sitting in the deep bbay here on the ship, so we'll have to be a bit more patient for the safey, but we are all excited to see how those stories fit in as well.

While many of our SODA colleagues are focusing on long-term measurements, our role is to take short snapshot, intensive looks at several safety baby the physical processes that we think are linked to accelerate rates safety baby sea ice melt. One general question we're all trying to answer is "What sets the distribution and mixing rates of heat in the upper Arctic Ocean. The surface water tends ssafety be cold and fresh.

Beneath that lay various layers of warmer and saltier xafety. The details of how this warmer water gets babj the Arctic, swirls around, and sometimes is mixed back upwards towards dexter johnson surface matter, as they set the propensity of that heat to either passively lurk or release heat for melting sea ice.

We'll post more details of the various saftey, science questions, and people onboard as we go along. But to start us off (while we still have high bandwidth on shore) here are some photos of our activities for the last several days.



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