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Salinity & Temperature - Oceanography
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The oceanic water shows movements in form of waves, currents and tides. Most of the movement in oceanic water is controlled by temperature and salinity distribution. This factor has been taken in this next lesson of oceanography.

Bhanwar Singh
Ex- National Defence Academy (115 Course) Cleared Civil Services Examination, 2012

Unacademy user
leap year explain krte wqt leap year k jagah normal year likh dia h
thank you sir @@!@!@!@!!!
High quality lesson. Lesson is really very helpful.
Bhanwar Singh
2 years ago
Thank you..
best information in only 8.1 mins thanks sir
Sir the map indicates Indian Ocean with the highest temperature, Pacific falls in 2nd place and then Atlantic....plz correct me if i m wrong....Thank you
Covered all the aspects for revision in less time. Lessons are really helpful. Thanks alot sir. PLz come up with INDIAN GEOGRAPHY in same manner.
  1. CRASH COURSE-WORLD GEOGRAPHY Presented by - Bhanwar Singh Sirohi


  3. ABOUT ME BA. (Hons) in Law from Awadh University I Defence Academy (115 Course) Cleared Civil Services Examination, 2012 Hobbies - Writing Poetry Course Fee Contribute Follow me on Unacademy at:

  4. TEMPERATURE The mean annual temperature of water Pacific > Indian>Atlantic' Maximum at equator and gradually decreases towards the poles Factors controlling Ocean Temperature Ocean Currents Latitude Insolation and Heat Balance Density of Oceanic water Salinity Evaporation and Condensation Local Climatic Conditions

  5. THERMAL LAYERS Due to temperature differences vertically, there are three layers in oceans from surface to bottom in the tropics Epilimnion: Top layer of warm water Depth ranges to 500m Temperature ranges between 20 C to 25 C Thermocline Middle layer of water Rapid rate of decrease of temperature with increasing depth Hyplomnion Bottom most layer of very cold water

  6. SEA SURFACE TEMPERATURE Dec 20 2013 "C 80N 32 28 24 20 16 12 8 60N 40N 20N 0 20S 405 4 0 60S 80S 150W 00w 100W 50W 0 50E 100E 150E

  7. SALINITY It is the total content of salt dissolved in the sea water Defined as the total amount of solid material in grams contained in one kilogram of sea water Expressed in part per thousand (960) Average salinity of oceans is 35 lsohaline: The imaginary line joining the places of equal salinity a Salinonectar: Instrument used to measure the salinity of the sea water Higher salinity results into Decreased rate of evaporation Increase in density of sea water

  8. AMOUNT OF SALTS PERCENTAGE IN OCEAN WATER 77.8% 10.9% 4.7% 3.6% 2.5% 0.3% 0.2% SALTS Sodium Chloride (NaCl) Magnesium Chloride (MgC2) Magnesium Sulphate (MgSO4) Calcium Sulphate (CaSO4) Potassium Sulphate (K2SO4) Calcium Carbonate (CaCO3) Magnesium Bromide (MgBr 2)

  9. FACTORS EFFECTING SALINITY Evaporation Influx of River Water Precipitation Circulation of Oceanic Water Atmospheric Pressure Wind Direction Melting of Ice Volcanic Eruption

  10. DISTRIBUTION OF SALINITY It generally decreases from equator towards the poles It is highest in the Northern Hemisphere-between 20% to 40 latitudes Southern Hemisphere-between 10 to 30 latitudes It increases with increasing depth in high latitudes with depth it increases first up to depth of 200 fathoms or 1 200 ft and beyond this, it decreases with increasing depth