TuesdayFebruary 12, 2013

(Introduction to Oceanography; Salinity; Video – Oceans Part1)

The Launch PadTuesday, 2/12/13

Complete the following sentence:

We know more about the surface of

the planet Mars than we know about

___________________.what’s in our own

oceans

Announcement

sHappy Birthday to President Lincoln!

AnnouncementsI will be available after

school from 4:45 until 5:15.

Assignment Currently Open

Summative or

Formative?Date Issued Date Due Date Into

GradeSpeed Final Day

Quiz 17 S2 2/1 2/1 2/1 FRIDAY

WS – Metamorphic

RocksF11 2/6 2/8 FRIDAY

Lab – Metamorphic

RocksF12 2/7 2/9 FRIDAY

Quiz 18 S3 2/8 2/8 2/11 2/25

Lab – Mixed Rocks F13 2/11 2/12 FRIDAY

Recent Events in ScienceLDCM Launched

Read All About It!www.nasa.gov/mission_pages/landsat/main/index.html

The Landsat Data Continuity Mission (LDCM) spacecraft is in orbit following a picture-perfect launch aboard a United Launch Alliance

Atlas V rocket yesterday. The Atlas V booster performed normally and the Centaur upper stage engine ignited as planned. The payload fairing that protected LDCM during the first part of ascent separated on time

and fell away, revealing the spacecraft. The Centaur's engine shut down to begin a 55-minute coast phase before it reignited to put LDCM into

its orbit above Earth.The Landsat Data Continuity Mission (LDCM), a collaboration between NASA and the U.S. Geological Survey, will provide moderate-resolution (15 m–100 m, depending on spectral frequency) measurements of the Earth's terrestrial and polar regions in the visible, near-infrared, short wave infrared, and thermal infrared. LDCM will provide continuity with

the 38-year long Landsat land imaging data set. In addition to widespread routine use for land use planning and monitoring on

regional to local scales, support of disaster response and evaluations, and water use monitoring, LDCM measurements directly serve NASA

research in the focus areas of climate, carbon cycle, ecosystems, water cycle, biogeochemistry, and Earth surface/interior.

Oceanography

Oceanography in the sense that we will study it should probably be titled “The

Hydrosphere”, because we will also study fresh water.

The Composition of SeawaterSeawater consists of about 3.5% (by weight) dissolved

minerals.Salinity refers to the total amount of solid material

dissolved in water.Salinity is typically expressed in parts per thousand (‰)

The average salinity of seawater is 35‰, with the

major constituent being sodium chloride

The Composition of SeawaterSources of Sea Salts chemical weathering

of rocks on the continents and

subsequent inflow from rivers

outgassing from volcanic eruptions

The Composition of SeawaterProcesses Affecting Seawater

Salinity

Variations in salinity are a consequence of changes in the water content of the solution.

Processes that decrease salinity (add water) include:

precipitation

runoff from land

icebergs melting

sea ice melting

The Composition of SeawaterProcesses Affecting Seawater

Salinity

Variations in salinity are a consequence of changes in the water content of the solution.

Processes that increase salinity (remove water) include:

evaporation

formation of sea ice

The Composition of SeawaterSurface salinity in the open ocean ranges from

33‰ to 38‰.

Processes Affecting Seawater Salinity

increase seawater salinity

decrease seawater salinity

A desalination plant that removes salts and other chemicals from sea water to produce fresh water.

Video

DisneyNatureOceans(Part 1)