Properties and behavior of h 2 0 1 the specifics
Download
1 / 43

Properties and behavior of H 2 0 1: The specifics - PowerPoint PPT Presentation


  • 76 Views
  • Uploaded on
  • Presentation posted in: General

Properties and behavior of H 2 0 1: The specifics. Lecture goal: To identify and describe the properties of water that are most important to understanding broader patterns of habitat structure and ecology in freshwater systems. Molecular Structure Density Temperature Oxygen Light.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha

Download Presentation

Properties and behavior of H 2 0 1: The specifics

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Properties and behavior of H20 1: The specifics

  • Lecture goal:

    • To identify and describe the properties of water that are most important to understanding broader patterns of habitat structure and ecology in freshwater systems.


  • Molecular Structure

  • Density

  • Temperature

  • Oxygen

  • Light

Properties and behavior of H20 1: The specifics


  • Molecular Structure

  • Density

  • Temperature

  • Oxygen

  • Light

The Specifics


Structure of H2O

  • Polarity

  • Solvent properties


Surface Tension


Surface Tension


  • Molecular Structure

  • Density

  • Temperature

  • Oxygen

  • Light

The Specifics


Temperature and Water Density


Anchor Ice


  • Density increases with depth.

  • Influenced by atmospheric pressure and other factors.

Depth and Water Density


Density (g / ml)

  • Freezing point of sea water (35 g/L) = -2ºC

  • Max density of sea water = -2ºC

  • Salinity of “Freshwater” ranges from 0.01 – 1.0 g/L

  • Saline lake  60 g/L

Salinity and Water Density


  • Molecular Structure

  • Density

  • Temperature

  • Oxygen

  • Light

The Specifics


Temperature and Water Density


Specific Heat of Water

  • Specific heat: amount of heat in calories required to raise a unit (i.e., a gram) of the substance by 1C.

  • Specific heat of water = 1

  • Latent heat of fusion = 80

  • Latent heat of vaporization = 540


Measuring Water Temperature

  • Standard / immediate temperature

  • Seasonal max, min, mean

  • Degree days


  • Molecular Structure

  • Density

  • Temperature

  • Oxygen

  • Light

The Specifics


How oxygen gets into water


How oxygen gets into water…or not


Pressure and O2 Solubility


Temperature and O2 Solubility

Oxygen Solubility (mg / L)


Salinity and O2 Solubility


  • Saturation or Equilibrium Concentration

    • Amount of DO that can be held by water in equilibrium with the atmosphere at a particular temperature, pressure, and salinity.

  • Supersaturation

  • Anoxia

  • Hypoxia

Oxygen Terminology


  • Molecular Structure

  • Density

  • Temperature

  • Oxygen

  • Light

The Specifics


  • Light is energy, capable of work and being transformed from one form to another.

  • Radiant energy of light transformed to potential energy by biochemical reactions (e.g., photosynthesis).

  • Light provides the majority of energy input to aquatic systems – but getting light INTO aquatic systems is tough.

Why is light important in aquatic systems?


Wavelength

Frequency

More Blue

More Red


How do plants receive light energy?

  • Quanta or photons at specific frequencies


Controls on light input: season and latitude


Controls on light input: direct solar radiation


Other controls on direct solar radiation

  • Time of day

  • Altitude

  • Meteorological conditions

  • Topography


Controls on light input: indirect solar radiation


Controls on indirect solar radiation

  • Scattering through atmosphere

  • Solar height


Controls on light input: reflectivity


Controls on reflectivity

  • Angle of incidence

  • Surrounding topography

  • Surface conditions of water


Albedo

  • Ratio of reflected to incident irradiance

  • Increases with reflection at surface and scattering within the lake.


Albedo


Light scattering within lakes


Density (g / ml)

Anthropogenic Salinization

Effect of Salinity on Density and O2 Solubility


ad
  • Login