Archive for April 6th, 2011

Wednesday, April 6th, 2011

spring is here! now, where’s summer?

Wednesday, April 6th, 2011

I am looking at April 6, 2011 at time 0712 GMT (or 3:12AM). In this first image, we see cold surface water temperatures closer to land, and warmer water from the gulf stream slowly coming closer to land, which will eventually begin mixing. Between the warm water mixing, and the sun warming up the water, within the next month or so the water closer to shore will begin to warm up. We can see the warm water already coming close to land as we move more south towards the Chesapeake bay area and below.

Also at the same time and date April 6, 2011 at time 0700 GMT (or 3:00AM), I took an image showing wind speed about 10 m above the surface (or 30 ft). Closer to shore, their is very little wind, roughly between 0 and 2.5 knots. As we move further out, wind speeds increase to about 15, 20, and eventually hit about 30 knots way offshore. The winds seem to be moving east, fairly all in the same direction. At same time and date, I pulled an image of the codar. There are some areas of rough currents, but off the coast of the Jersey shore conditions are fairly stable and would be acceptable glider conditions. However, as we move further south along the Maryland and Virginia coast, currents get a bit stronger in some places.

Overall, if conditions are to stay like this for tomorrows glider deployment, all should go well. There a few rough spots in terms of currents, but if the glider were to move horizontally to the currents vertical direction, all should go smoothly.

by Nicole Del Monaco

I couldn’t think of a creative title

Wednesday, April 6th, 2011

This  is an image of predicted rainfall for Thursday at 9:00am. There is a light green band towards the north but it only ranges from .1-.2 inches.

This is a prediction  of wind speed at the same time. There is a large section that is identical to the precipitation that shows a wind coming from the North West that ranges from 10 to 15 kts

This is a prediction to surface temperature that ranges from the bottom of New Jersey reaching 48 F to the north having 36 F.

Overall deployment looks to be clear with a possibility of  slight drizzle around 9am but temperature and wind speed appear to be  nothing too major

Chris Gillotte

Search for Salinity

Wednesday, April 6th, 2011

We were looking this week for salinity data for the North Atlantic and it proved to be more difficult than we planned. As shown below, surface data for salinity is readily available, however we are more interested in what is going on below the surface such as changes in the halocline.

The Soil Moisture and Ocean Salinity (SMOS) satellite is one satellite that looks at salinity in the ocean (as well as soil moisture). We are still trying to find out how to get access this data. Until then, we need to explore other options.

Our other source for this salinity data is going to be gliders. If we can get an idea of salinity in areas we have deployed in the past that are close to where we will be deploying for this flight, that would be helpful. We are going to need to find out what projects were held in the North Atlantic so that we can find the data.

With the salinity data we can look at temperature data and then derive density. We need this data because the glider needs to be correctly ballasted so that it sits properly in the water as well as ascending and descending properly and efficiently.

NASA (ocean overview)

Chris Filosa & Abe Gelb

Standard Expectations

Wednesday, April 6th, 2011

Sea Surface Temperature for April 6th

Chlorophyll for April 6th

If the future is anything similar to these two images, we know what to expect for the gliders. Regardless of their deployment locations, the outcomes should be the same. As we learned, areas closer to the coast should be colder as opposed to farther off the coast towards the shelf, because warm water is approaching from the Gulf. Chlorophyll levels should be greater at shallow areas and areas near land because there are more nutrients there than in open water where there is little upwelling.

-Oliver Ho

“Bi-Winning”

Wednesday, April 6th, 2011

Both images are from today, April 6th.

One place the glider could visit is Nantucket Shoals (near Massachusetts).

When you compare the current speeds with current temperatures, the yellow/orange arrows are usually associated in the same area with the red temperature zones.

However, there is an area near Nantucket Shoals that has red/orange arrows representing the current speed, but purple zones for temperature, with purple representing cold temperatures.

Perhaps the glider can be deployed in this area to figure out why the currents are fast if its a cold current zone.

-Bronson George

Sea Surface Temperatures

Wednesday, April 6th, 2011

by Nicole Del Monaco

As we can see the sea surface temperature is much cooler closer to land and gets warmer further out. There are some blotches of warm weather before the surface temperature reaches temperatures above 19 degrees C.

Continuation of “Biofouling” The Gliders Worst Enemy

Wednesday, April 6th, 2011

These images are a representation of what may happen to the glider on its journey for the next mission. These are just some of the creatures in the depths of the ocean that will decrease the speed of the glider and how long it will take for the mission to be complete. As what is shown, the glider with the gooseneck barnacles attached to it has only a certain part of the glider covered. Scientist have created a coating that is called Clear Signal, which keeps organisms such as the barnacles to stay off of the glider. The mission for glider 27 had 90% of the glider covered with Clear Signal and yet there still was a sufficient amount of biofouling attached.

Ways of Anti-fouling
Biocides
  Main Type-Tributyltin Moiety (TBT)
   -- Toxic to both microorganisms and larger aquatic organisms
   -- Covers about 70% of the world?s ships
   -- Causes harm to many marine organisms, especially mussels and oysters
   -- Banned by most boating companies now
  Muntz Metal
     -- Placed on the bottom of ships to reduce bio-fouling
Two Types of Non-toxic Coatings
Hydrophobic
Creates a smooth surface which can prevent attachment of larger microorganisms.
Doesn't endure long term use because biofilm develops and covers coating and
microorganisms can then grow again Ex. Fluoropolymers and Silicone coatings
Hydrophilic
Ex. Glycine Betaine and Sulfobetaine
Prevent biofilm from forming

Bill. Kristen