The glider hits the curl, and will start to swing up riding the meander. I happy that I am not in these waters!! Check out the storm that passed through the system. This will require a nice bottle of wine being shared when we finish the mission, like we did in Paris with John Cullen when ICOOL concieved.

Glider Flight 100 Completed!!!

RU16 has successfully completed glider flight 100. In 24 days it flew 650 km from its place of birth on Cape Cod, MA to its new home in New Jersey. During its flight RU16 completed five cross-shelf and along-shelf sections, collected valuable physical and biological data about the whole Mid-Atlantic Bight during the spring transition time. The glider was recovered just off the coast of NJ near Tuckerton on April 6th, exactly as planned. Congratulations to the RU glider team for completing a perfect flight!

Here is the final dataset along the Endurance Line from the RU16 flight:

Almost there

RU16 is now flying toward Tuckerton along the endurance line. The mission is almost over, and it has been extremely successful so far. The temperature cross-section reveals lots of structure over the shelf. The data is very similar to the observations collected by RU01 about 3 days ago, indicationg that short-time variability is small right now.

Crossing fronts

RU16 is now moving toward the offshore end of the Rutgers University Glider Endurance Line. The glider crossed a strong temperature front (also seen in the sea surface temperature image from two days ago, see post below) and is now in surface rich chlorophyll waters. Once RU16 reaches the offshore waypoint, it will head onshore along the endurance line. RU01, the other glider currently in the waters of NJ, is already moving onshore along that line. RU16 will trail RU01 by about 4 days.

The crossing under the shipping lanes continues

The glider makes good progress as it heads under the last major shipping lane today and tonight. Hopefully tomorrow it will be smooth sailing on the open waters of the MAB. Interesting frontal boundaries, and as has been the case the last few days, lots of plants in the surface waters and non plant particles dominating the deeper water optical signals.

Approaching waypoint

RU16 continues to make solid progress toward the next waypoint. It will be there at sometime tomorrow.
The glider is almost over crossing a band of warm waters near the Hudson River Canyon. The warm waters are restricted to a thin band near the surface, as revealed by the glider observations. The variation near-surface salinity is much weaker. The chlorophyll concentration is high in the upper water column

Glider update

RU16 has been going back and forth along Eric Powell's fisheries transect for the last 3 days (see map below). It collected a total of 4 transects, which will give us information about short time variability in the hydrographic fields in the area. As soon as it hits the waypoint, it will head to the southwest toward the southern flank of the Hudson Shelf Valley.

the nepheloid layer is present!!

The glider heads into the major zone of shipping activity next. crunch time on the ocean turnpike. interesting observation today is the nepheloid layer in the warm bottom water. the backscatter says lots of paticles are prsent with very little chlorophyll present. That means either sediment or detritus which is often what dominates nepheloid layers. The nepheloid layers often seem to be dominated by detritus which is "fluffy" and easily maintained up in the water column.

Almost at waypoint

RU16 is almost at the next waypoint. The southeastward velocities over the shelf are helping the glider fly very fast (24 km in 18 hours).

After reaching the waypoint, the glider will follow the green line in the plot above, coordinating with Eric Powell's fisheries cruise. The salinity section below reveals lots of small scale structure over the shelf. The glider is now in waters nearly homogeneous, with gradients only in the near-bottom layer.

Long Island source of CDOM water?

Here we have mean surface current map from the last 4 days. Notice the northeast section of the map...we see surface advection from Long Island heading offshore towards the shelfbreak and it goes right through the area RU16 was flying! So could Long Island be the source of the high CDOM water that we saw in the glider section? Interesting...

COOL CDOM WATERS, where do they come from?

The glider continues to make nice progress. We will now prepare to turn into the Glider zone of death (check out the ship tracks). We should have an exciting couple of days! The salinity (and temperature) show a zone that is unique. In the unique water mass, the lower salinity water shows very low chlorophyll but very cooly shows higher Colored Dissolved Organic Matter (CDOM). Next steps is check out the CODAR currents!!

Glider update

RU16 is now 2/3 of the way to the next waypoint. It will be very soon in the area where the current CODAR coverage extends. It seems like the glider will be facing some weak, opposing currents.

solid progress towards waypoint 2

RU16 is making solid progress to waypoint 2, we expect arrival within the next two days.
The glider track shows that RU16 has been moving in a nearly along-shelf direction on the second leg so far. Both CTD and optical data has both shown plenty of structures. We can see in the temperature section that we have just moved through a region of very cold water (< 5.5 deg C).

Turbid deep water -- figures

The following figures go along with Oscar's previous posting. Please read his post first.

high backscatter signal at depth:
low corresponding chlorophyll signal:

Turbid deep water

The optical backscatter data again provides an interesting picture that shows turbid subsurace water with low chlorophyll. The high turbidity is associated with the warm and saline deep waters. now as the storm passes lets see if the biological activity starts picking up in the surface waters. the blogger has been great, I will start publicizing more to outsiders in the coming week.

Great work, and a fun flight for 100th celebration flight! osc

Surface Current on the New Jersey shelf

Here we have the mean surface current integrated from the beginning of March to now (March 18). The mean current north of the Hudson Shelf Valley is very weak inside the 100 m isobath.
Mean surface current map for the past 4 days shows mainly downshelf flow to the southwest.
The winter storm has left the region after dumping a couple inches of icy snow. Louis will have more on the post-storm analysis.

RU16 entering New Jersey shelf

After crossing the shipping lanes by running 12 hour missions using the new flight profiles, the glider has resumed its normal flight behavior heading for the next waypoint on the NJ shelf near the 60 meter isobath north of the Hudson Shelf Valley.
Latest data suggests that the glider is starting to encountering warmer/saltier slope water at depth below the 70 m isobath. The cross-shelf salinity (temperature) section shows an interesting fresh-salty-fresh-salty (cold-warm-cold-warm) pattern.
This is very different than what RU01 currently sees on the Endurance line south of the Hudson Shelf Valley, where we have significant intrusion of the slope water onto the shelf throughout the entire water column:
Next we'll look at the surface current during the month of March on the New Jersey shelf.

Shelf response to storm

The NOAA RUC analyses provided by Louis shows the strong winds that hit the MAB last night.

The response over the shelf to the storm was very strong, with currents over 50 cm/s extending for more than 500km. RU16 is a bit to the east of where the radar coverage ends. The glider is cycling the full water depth again, after the shipping lanes were left behind.

Made it Across!

Josh sent around the morning email. RU16 successfully surfaced on the southern side of the shipping lanes. A new trail blazed between Massachussets and the shelf break. Josh will keep RU16 on this southerly course for most of today, surfacing every 3 hours to download data. Once we cross over the 100 m isobath, taking us well south of the shipping lanes, RU16 is programmed to turn right and head due west towards Hudson Canyon. There it will link up with Eric Powell's vessel on a fish research cruize.

Half way across

Josh and John sent RU16 across the first lane into the seperation zone. Checking the AIS data, no ships were reporting in the area. Data was downloaded. Back on a mission across the next lane. We'll know more in the morning.
They were able to download datstarted RU16 just 1 km north of the shipping lanes earlier this afternoon, and sent i