Post on 29-Jan-2016
transcript
pH
pH
pH
• Each change in pH really means…
Water pH Lab
Look at your graph…
• What does it show you?
Seawater has a BUFFER!
• What is it?
• What causes it?
• How is seawater different from fresh water?
pH Buffer System
• If acid is added (sewage output/volcanic activity)
• If alkaline solution is added
Photosynthesis?? Respiration??
Ocean Acidification
Ocean Acidification Lab & Case Study
• http://dataintheclassroom.noaa.gov/SitePages/oa/simulation#
• Bring a water sample tomorrow!
Videos!
Dissolved Oxygen (DO)
Seasonal DO variation –what could cause this variation?
Profile Graph
COMPARING WATER SAMPLES LAB
How can we measure….
Salinity
DO
pH
CASE STUDY—THE DEAD ZONE
Marine Issues--Homework
NOAA Dead Zone Video4 min
•Eutrophication—
•Hypoxia—
•Dead Zone—
• Online Map Activity
• What waterways connect to the Gulf?
• What smaller waterways connect to those?
• What natural processes could be contributing to water quality degradation and the development of the Gulf dead zone?
Make a Hypothesis
• What anthropogenic activities or materials could be contributing to water quality degradation and the development of the Gulf dead zone?
http://www.nationalatlas.gov/mapmaker?saved=T&left=-5954010.16308408&right=4024783.32376774&top=4336078.07187835&bottom=-2650901.64560656&mWidth=547&mHeight=383&visLayers=states%2Cusurban%2Cgrid%2Clakesrive
• http://
mapmaker.education.nationalgeographic.com/?ar_a=1&b=1&ls=000000000000#/
• What anthropogenic activities or materials could be contributing to water quality degradation and the development of the Gulf dead zone?
Turbidity
Measuring turbidity
Taking a Secchi Disk Reading Using a Turbidity Sensor
Turbidity
• 1. average salinity of seawater_____• 2. average pH of seawater________• 3. range of pH in seawater___ to ___• 4. instrument to test seawater salinity______• 5. type of bond between water molecules____• 6. type of molecule water is:___________• 7. area in the ocean with drastic change in
salinity___________• 8. area in the ocean with drastic change in • density____________• 9. What type of graphs do we use to show changes as
you go down in the ocean?_______• 10. What units do we use for salinity?_____
Magic numbers!!!!!!!!
Salinity –avg 35 ppt
DO –avg 5 – 6 ppm
(2ppm hypoxic; 0ppm anoxic)
pH –avg 8 (7.5 – 8.4)
CELEBRATION OF KNOWLEDGE TOMORROW!!!
Thanks to the following websites for photos and information:
http://mddnr.chesapeakebay.net/eyesonthebay/whatsitmean.cfm
http://www.bigelow.org/virtual/heat_cap.jpg
http://schc.sc.edu/mare/estuaries.htm
http://waterontheweb.org/under/waterquality/turbidity.html
http://www.indiana.edu/%7Eg131/chem6.gif
http://www.whoi.edu/OCB-OA/page.do?pid=112076