16Oceans

16Oceans - 11/27/2007 ESM 203: Ocean Processes and...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
11/27/2007 ESM 203: Ocean processes and circulation 1 ESM 203: ESM 203: Ocean Processes and Ocean Processes and Circulation Jeff Dozier & Thomas Dunne Fall 2007 What is sea water? y Sea water is 96½% pure water y Remaining 3½% is other materials issolved salts gases and organic substances as well as Dissolved salts, gases and organic substances, as well as particles y Physical properties are mainly related to the pure water, along with the dissolved salts y Water mass characteristics alinity temperature nutrients oxygen 2 Salinity, temperature, nutrients, oxygen y Key property (for circulation) is sea water density Variability in vertical – inhibit or enhance mixing Variability in horizontal – drive currents Sea water density y A function salinity, pressure, and temperature Ranges from about 1020 to 1040 kg m –3 ceanographers use the gma escription y Oceanographers use the sigma-T description ( ) ( ) ,f , , 0 1 0 0 0 ranges from 20 to 40 σ == t ST STP 3 Temperature y Temperature generally decreases with depth in e ocean the ocean y Changes in temperature generally regulate changes in density except where ice is formed (which increases salinity) ule of thumb: 4 y Rule of thumb: 3 3 kg m 0.2 deg i.e. 1 kg m for 5 C ρ Δ ≈− Δ Δ≈ + Δ= D T T
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
11/27/2007 ESM 203: Ocean processes and circulation 2 Temperature in the Equatorial Pacific 5 Equatorial Pacific - WOCE150W Temperature in the Southern Ocean 6 60S - WOCE150W Salinity y Ocean waters are salty "l t " y The “salts” (Cl , SO 4 –2 , Na + , K + , etc) are in approximately constant proportions Residence time is huge mass "salts" Salinity mass sea water 7 To practically estimate salinity, we measure just one ion, Cl Salinity y Salinity varies from 32 to 37 psu (practical salinity nits ~ parts per thousand) units, ~ parts per thousand) Good water mass tracer Lower/higher values are unusual (river input, high evaporation, sea ice formation) y Rule of thumb: 8 3 kg m 1 psu S ρ Δ ≈+ Δ
Background image of page 2
11/27/2007 ESM 203: Ocean processes and circulation 3 Pressure y The weight of overlying sea water above a depth uses pressure (hydrostatic equation) causes pressure (hydrostatic equation)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/06/2008 for the course ESM 203 taught by Professor Dozier,dunne during the Fall '07 term at UCSB.

Page1 / 10

16Oceans - 11/27/2007 ESM 203: Ocean Processes and...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online