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Slide 14. Which do you think is most dense?. Salt water. Fresh water. Click to watch video. Now let’s look at another variable… Which do you think is most dense?. Warm water. Cold water. Click to watch video.
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Slide 14 Which do you think is most dense? Salt water Fresh water Click to watch video
Now let’s look at another variable…Which do you think is most dense? Warm water Cold water Click to watch video
Now that you have seen the video ~ which is more dense, warm water or cold water? What happens to the warm water? Warm water Cold water
So which would be the MOST dense: click on the one you think is correct Rollover: Really close! Cold water is more dense than warm, but what did you learn about fresh water? It is less dense than salty water. Warm, fresh water Cold fresh water Rollover: Almost, but not quite: remember warm water is less dense and layers on top of cold water. Warm salty water Cold salty water Rollover: Congratulations! Cold salty water is the most dense!
Slide 16 The Hudson River Plume is chemically and physically very different from the surrounding bay water. Two ways scientists try and distinguish plume water from surrounding ocean water is to look at thesalinityand temperature Temperature Salinity The surface water temperature of the plume and ocean water can be very different. In spring for instance, because river and estuary water are much shallower than ocean water it tends to warm up much faster than the nearby ocean water. But then in the late fall and early winter the opposite occurs. River water tends to cool down somewhat faster than the ocean water, until winter when both become similarly cold Because the plume is freshwater, salinity (or the amount of saltiness) in the plume is much less than outside the plume. Coastal ocean salinity in the Mid-Atlantic region is generally greater than 31 ppt (parts per thousand) and salinity of the plume is generally less than 25 ppt. Ocean water and river water tend not to mix due to these differences in salinity. Without getting mixed and diluted the plume can travel far That’s why we can see the impacts of the plume sometimes as far away as southern New Jersey (that’s over 100 miles!)
Slide 17 MeetBrian Gaas. Brian is a pretty cool guy. He’s from Texas. He is a certified emergency medical technician, likes to compose classical music, explore caves on land and also is a certified cave diver. That’s a person who not only explores underground caves, but has to sometimes dive underwater to get to them! Pix of Brian? Brian interview.wmv Click to watch an interview with Brian Brian is also a marine microbiologist and was the marine technician aboard the R/V Cape Hatteras during a recent scientific experiment off the coast of NJ. Picture of the dye in the plume LaTTE 2004
Slide 18 Adirondack Mountains Google Earth shot of the Hudson River Or like one of those tourist maps that Shows the local points of Interest in an area.
