Oceanography

Stellar Nucleosynthesis

one billion years after the big bang- stars formed and with them other heavier elements - increase temperature and pressure caused heavier elements to form

Easter Islands

polynesians created a thriving culture in the first millennium but overpopulation eventually led to the gradual deforestation and extinction of natural resources which caused the demise of the Rapa Nui civilization

At many station, the Challenger crew would

samples of sea-water samples at different depths.

Atomic Weight:

average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally occurring element.

860 AD voyage

first Viking voyage to iceland

900-700 B.C. Greeks

had traveled inside the Mediterranean but not outside of it

How many stars are there?

in the milky way we think there are 200-400 billion but there might be 3000 galaxies

James Cook's second voyage- Resolution

(1772) The Royal Society still believed there was a massive southern continent that should exist. Cook's expedition circumnavigated the globe at an extreme southern latitude, becoming one of the first to cross the Antarctic Circle. His reports upon his return home put to rest the popular myth of Terra Australis. This voyage marked the successful use of the marine chronometer(calculated longitudinal position). Did not lose any men on this voyage.

HMS Beagle second voyage

(18310 1836) There were many difficulties and delays which led to Charles Darwin joining the voyage. Darwin kept a diary of his experiences and rewrote it as a book called Journal and Remarks which was renamed to be the Voyage of the Beagle

HMS Beagle third voyage

(1837 to 1843) set off to survey large parts of the coast of Australia. The Beagle Gulf was found

The Trieste

(1960) a Swiss-designed, Italian-built deep-diving research bathyscaphe,the first manned vessel to have reached the bottom of the Challenger Deep. (roughly 7 miles beneath the ocean surface) -Piccard and Walsh of the US Navy reached the goals of project Nekton

collisions

(Transfer of kinetic energy into heat)

nebula

(large, diffuse gas cloud of gas and dust)

Frozen Ocean Theory

- 3 bya, the Sun was thirty percent less luminous than it is today. - there is 300m of ice (protection from UV) - below there is prebiotic chemistry - it is cold so allowed for organic molecules to survive for long periods of time

Captain Cook and Scurvy

- Cook had 5 cases of scurvy -he made sure his crew members had sufficient vitamins and prevented them from getting scurvy

colonization of western pacific islands by the Polyneasians

- there are 10,000 islands in the western Pacific -Colonized New Guinea (30,000 years ago) -Colonized Philippines (20,000 years ago) -Colonized Hawaii (farthest away away from any land masses)- 1,500 years ago -easter Island- around 1200 A.D. -from genetic evididence

The Bathysphere

- was a unique spherical deep-sea submersible which was unpowered and lowered into the ocean on a cable, and was used to conduct a series of dives off the coast of Bermuda from 1930 to 1934. -designed by William Beebe & Otis Barton

The Giant Impact Hypothesis

-50 million years after the initial creation of Earth, a planet about the size of Mars collided with Earth to create the moon. This idea was first proposed about 30 years ago, but it took calculations by modern high-speed computers to prove the feasibility

Woods Hole - US Fish Commission - 1871

-beginning growth of marine research -in cape cod - a number of eminent scientists brought to Woods Hole -the federal government realized that marine populations needed to be studied and managed to protect fishing stocks and the markets that depended on them

3 major factors that caused heating and melting in the early Earth's interior:

-collisions -compression -radioactivity of elements (e.g. uranium, potassium, or thorium)

Formation of the Atmosphere and the Ocean

-early solid earth had very hot surface had no atmosphere or oceans -condensing water vapor, thick clouds, heavy rain - as earth cooled, oceans formed 4 bya

Routes taken on Fram's expedition (1893-1896)

-eastward from Vardo along the Siberian coast, turning north at the New Siberian Islands to enter the pack ice -drift in the ice from the New Siberian Island North and West to Spitsbergen -March farthest North and then retreat to Cape Flora -Return to Vardo form Cape Flora -voyage from Spitsbergen to Tromso

James Cook's Three expeditions

-endeavor -resolution -adventure

the nebular hypothesis

-explains formation and evolution of the solar system -a nebula contracts under gravity and heats, flattens and spins faster, becoming a spinning disk of dust and gas -stars form in the center of the disk and planets form on the outer parts of the disk -H and He remain gaseous but other material can condense into solid "seeds" for building planets -warm temperatures allow only metal/rock "seeds" to condense in the inner solar system -cold temperatures allow "seeds" to contain abundant ice outer solar system Formation of Protoplanets -solid seeds collide and stick together -larger seeds attract others with gravity, growing bigger still -terrestrial planets are built from metal and rock - the seeds of gas giant planets grow large enough to attract hydrogen and hellium gas, making them into giant, mostly gaseous planets, moons form in disks of dust and gas that surround the planets Our Solar System -terrestrial planets remain in the inner solar system -gas planets remain in the outer parts -"leftovers" from this process become asteroids (metal/rock) and comets (mostly ice)

The Cook Expedition Findings

-extensive scientific investigations -arctic to antarctic -mapping of the pacific ocean -depth soundings -winds and currents -subsurface temperature -biological sampling -general geography of the world

Farthest known extent of European exploration before Columbus (Vikings)

-first viking voyage to Iceland -Erik the Red discovered Greenland -Bjarni Herjolfsson- first to see North America (Vinland) Leif Eriksson- found North America (Vinland)

Meteorites

-give us access to debris left over from the formation of the solar system -can determine the age using using radioactive isotopes and their decay products

Edward Forbes

-he pursued the study of life in the littoral zones (the ocean from the shore to the continental shelf) and developed an interest in the geographical distribution of animals. -known for azoic theory

Types of Bonds

-ionic -covalent -hydrogen

Colossal Squid (Mesonychoteuthis hamiltoni)

12 - 14 m long.....(39-46 ft) (think Olympic size swimming pool)

the big bang occured

13.7 billion years ago

density of gold

19.30

First people to explore the ocean

30,000 years ago - Polynesian Seafarers started migrating across the Pacific.

age of the earth

4.57 billion years old

PLANET WATER

70.8% OF EARTH IS COVERED BY WATER -97% in oceans and seas - 2% lakes and rivers - 1% snow and ice as glaciers - >1% atmospheric water

Isotope:

Atoms with the same number of protons but different number of neutrons. ex. Carbon-12 = 6 protons + 6 neutrons Carbon-14 = 6 protons + 8 neutrons

ecosystems

Biotic/Abiotic (i.e. - the living/non living) components of a system....

985 AD voyage

Bjarni Herjolfsson - missed Greenland - is thought to be the first to see New Foundland. He is believed to be the first to see North America.

Six elements are the major constituents of living tissue and they account for 95% of the biosphere...

CHONPS -carbon -hydrogen -oxygen -nitrogen -phosphorus -sulfur

Chemical Composition of Earth

Each of the major layers has a distinctive chemical composition, with the crust being quite different from the Earth as a whole

981 AD voyage

Erik the Red... sailed west from Iceland and discovered Greenland.

big bang nucleosynthesis

H and He forming seconds after Big Bang

seconds after the big bang

Hydrogen and Helium began to form

995 AD voyage

Leif Eriksson -son of Erik the red - set out to find New Foundland - and did - he named it Vinland because of the grapes.... But the Vikings left Greenland and Vinland - and were gone by around 1450.

What is density ?

Mass per unit volume

early earth (4 to 4.5 billion years ago)

Our recently formed moon rises in the night sky. Not in its final orbit yet, the moon is seen much larger in the sky than than today's moon. Magma flow from mare volcanism can be seen on its surface. Three comets, or water-rich asteroids, begin their descent into Earth, delivering with them a supply of frozen water

Origin of Earth's atmosphere

Partial melting resulted in outgassing about 4 billion years ago - Similar to gases emitted from volcanoes - Mainly water vapor - Carbon dioxide, hydrogen - Other gases such as methane and ammonia

Proto-earth (4.5 billion years ago)

The sky above a still-forming proto-Earth is filled with the dust, rocks and gas that are shaping our solar system. A rising proto-sun illuminates the dust and rocks that gravity brings hurtling toward this new planet. The first comets, scattered by the gravity of the giant outer planets, appear in our sky.

Gokstad Ship

a viking ship intended for warfare, trade, transportation of people and cargo. Was used during the period that the Vikings expanded into Dublin, Ireland and York, England at the end of the 9th century

What is life?

a)Homeostasis b)Organization c)Metabolism d)Responds to stimuli e)Adapts f) Reproduces g)Growth

What is required for life?

a)Water - essential to all living things b)The right temperature range c)Renewing crust! (CHNOPS) d)Atmosphere (why?) e)Stable energy source

phytoplankton

are photosynthesizing microscopic organisms (account for half of the photosynthetic activity on earth) that inhabit the upper sunlit layer of almost all oceans and bodies of fresh water and are a key factor of oceans, seas and freshwater basins ecosystems. They are agents for "primary production," the creation of organic compounds from carbon dioxide dissolved in the water

the first oceanography textbook

by Lt. Matthew Maury named The Physical Geography of the Sea

HMS Beagle

constructed in 1820 for the Royal Navy. Took part in the fleet celebrating the coronation of King George IV of the UK. First ship to sale under the London Bridge.

Density stratification

describes the layers of water in a body of water with a layer of cold dense water at the bottom and, at temperatures above freezing, a warmer layer floating on top.

ionic bond

electrons are gained or lost - ex sodium chloride ( Na+ Cl-)

covalent bond

electrons are shared

whole earth's composition

iron (35%) Oxygen (30%) Silicon (15%) Magnesium (13%) Nickel, sulfur, calcium, aluminum, other

An ion

is an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge.

The Voyage of the Beagle by Charles Darwin

is illustrating his changing views at a time when he was developing his theory of evolution by natural selection and includes some suggestions of his ideas

James Cook's third voyage- Adventure

led the public to believe the voyage was planned to return the pacific islander to Tahiti but were actually to locate a Northwest Passage to the American Continent. Cook became the first European to begin formal contact with the Hawaiian Islands (named them the sandwich islands). He then accidentally sailed towards Canada and anchored at Yuquot. He then went on to identify what became known as the Cook Inlet- 180 mile body of water on the gulf of Alaska. Cook charted the majority of the North American north-west coastline on world maps for the first time, determined the extent of Alaska, and closed the gaps in Russian (from the West) and Spanish (from the South) exploratory probes of the Northern limits of the Pacific.

azoic theory

no life in the deep ocean (>550 m)

Atomic Number

number of protons

earth's crust composition

oxygen (46%) silicon (28%) aluminum (8%) Iron (6%) magnesium (4%) calcium,potassium, sodium, other

Wyville Thomson on sampling

the Challenger made 362 sample/observation stations "at intervals as nearly uniform as possible

Dispelled the Azoics Theory

the challenger expedition disproved this theory -133 dredges taken -4700 new species discovered

During this time (temperatures below earth's surfaces reach the melting point of iron)

the heavier elements, including the melted iron, began to sink down into the core of the Earth, while the lighter elements such as oxygen and silica floated up towards the surface- density stratification and crust forms

Malama Honua

the polynesian voyaging canoes are sailing across the Earth's oceans to join the global movement towards a more sustainable world (started in 2013)

Panspermia

the proposal that microscopic life forms that can survive the effects of space, such as extremophiles, become trapped in debris that is ejected into space after collisions between planets and small Solar System bodies that harbor life. If met with ideal conditions on a new planet's surfaces, the organisms become active and the process of evolution begins.

Stanley Miller Experiment

was a Jewish-American chemist who made landmark experiments in the origin of life by demonstrating that a wide range of vital organic compounds can be synthesized by fairly simple chemical processes from inorganic substances. He is aptly regarded as the "father of prebiotic chemistry"

Zheng He

was a navigator that lived from 1371 to 1433. had 48 to 317 ships and 28,000 crew members. He commanded expeditionary voyages to Southeast Asia, South Asia, the Middle East, and East Africa from 1405 to 1433. He demonstrated the power and wealth of the Ming Dynasty- he spread the glory of China to the countries he visited. When a new emperor took the throne- he criticized Zheng and the sea voyages were abandoned. Zheng took seven voyages in his life time

Origin of Earth's oceans

• Water vapor released by outgassing • Condensed as rain • Accumulated in ocean basins • About 4 billion years ago • Ice Comets were (maybe) also important to adding water to the Earth system

Trichodesmium

also called sea sawdust. Fixes atmospheric nitrogen into ammonium

James Cook first voyage (endeavor)

(1768-1771) Sailed from England westward across the Pacific to Tahiti, where the observations of Venus Transit were made. Mapped the entire coastlines of New Zealand. He then searched the South Pacific for signs of the postulated rich southern continent of Australia.- found dark skinned people and unique . Chartered the entire continent of Australia. (first Europeans to do so)

HMS Beagle first voyage

(1826-1830) captain fell into depression and killed himself. Replaced by Lieutenant W.G. and sailed to Montevido. Beagle Channel was identified (a strait in South America)

At most station, the Challenger crew would

- a fair sample of the bottom animal life (fauna) (dredge or trawl) -the animal life of the surface and of intermediate depths (tow nets). -a series of temperature observations was made at different depths

Fridtjof Nansen

- tested the possibility of reaching the North Pole by using the natural drift of Polar Ice (Fram's expedition) -first to cross Greenland's inland ice, failed to reach the north pole

Lt. Matthew Maury

-Head of the U.S. Navy's Depot of Charts and Instruments. -1847-assembled the observations archived there into charts of winds, currents, and sea state throughout the trade routes. -1855-Author of the first oceanography textbook The Physical Geography of the Sea. -Father of Physical Oceanography -Probably, the first person to devote full time to the study of the ocean.

the challenger expedition

-Lead by Charles Wyville Thompson - Departed on December 7, 1872 -was a scientific exercise that made many discoveries to lay the foundation of oceanography -catalogued over 4,000 previously unknown species -traveled nearly 70k miles -sampled in the North and South Atlantic and Pacific Oceans -Travelled north of the limits of drift ice in the North Atlantic polar seas and south of the Antarctic Circle -measured the depths of the Marianas Trench (deepest part of the worlds oceans) in the western Pacific (26,850 feet) -atmospheric and other meteorological conditions were carefully observed and noted. The direction and rate of the surface current was determined. -major motivation- - is there life at depth?

Navigators

-Zheng He (1405-1433), hundreds of ships and thousands of crew members -Columbus (1492), 3 ships and 90 crew members (america) -Da Gama (1498), 4 ships and 160 crew members (india) Magellan (1521), 5 ships nad 265 crew members (the first circumnavigation of the Earth)

biosphere

-Zone of Life on Earth -Global Sum of all ecosystems

scurvy symptons

-loss of teeth -sunken eyes -pale skin caused by deficiency of vitamin C

methods of early navigation

-reflection of islands in the clouds -followed birds (Frigate and terns- dawn and dusk patterns) -stars -swells -stick charts -smell of the water

earth composition general

-solid iron inner core -liquid iron outer core -mantle -crust on the outside

Geological time of earth

-sun formed -moon formed -earths core grows and differentiation completed -oldest mineral grain and continental rocks -earliest evidence of liquid water -earliest evidence of life -major phase of continent formation complete -build up of oxygen -ice covered earth -big bang -mass extinction -earliest land animals -mass extinction -earliest flowering plants -mass extinction -first hominids -first appearance of our species

Hydrothermal Vents

-that simple metabolic reactions emerged near ancient seafloor hot springs, enabling the leap from a non-living to a living world. -scientists discovered biological communities unexpectedly living around seafloor hydrothermal vents, far from sunlight and thriving on a chemical soup rich in hydrogen, carbon dioxide, and sulfur, spewing from the geysers.

Where did the Ocean come from ?

-two sources of water -Outgassing -Comets

density in order- lightest to heaviest

-water -glass -lead -mercury -gold

where did life on earth come from?

1. Panspermia 2. Frozen Ocean Theory 3. Hydrothermal Vents

Global Chemical Differentiation

Chemical seperation was completed by about 4.3 billion years ago, and the Earth had developed a inner and outer core, a mantle and crust

At intervals, the Challenger crew would

1. measure depth 2. sample of the bottom 3. A sample of bottom water for chemical/physical examination 4. recorded bottom temperature

evidence of The Giant Impact Hypothesis

1. moon rock is younger than other celestial bodies (~ 30-55 million years) - 2. similar composition to earth - 3. moon is less dense than earth and other planets.....

density of water

1.00 g cm-3

Oservations of Venus Transit

During a transit, Venus appears as a small black disc traveling across the Sun. It takes place in a pattern that repeats itself every 243 years. It includes two transits that are 8 years apart. There are four phases, first is Venus touching outside rim of sun, second is Venus within the sun's disc, third Venus crossed the sun, and the fourth is Venus completely off the sun but still touching the outer rim. Observers had trouble recording the exact times of the different stages because of a haze.

Kon-Tiki by Thor Heyerdahl

Theory- could Polynesia have been colonized by trans-Pacific emigres from the pre-Colombian cultures of South America? Heyerdahl gathered five friends and set sail from Peru across the Pacific to Tuamotus, French Polynesia Kon-Tiki demonstrated that it was possible for a primitive raft to sail the Pacific with relative ease and safety, especially to the west (with the trade winds).Sailors could have survived by fishing. Blood samples taken proved Heyerdahl's hypothesis but scientists argued contamination. The South American Sweet potato was part of a dietary supplement in Polynesia

Hokule'a

a traditional Polynesian canoe

ocean acidification

is the ongoing decrease in the pH of the Earth's oceans, caused by the uptake of carbon dioxide (CO 2) from the atmosphere. An estimated 30-40% of the carbon dioxide released by humans into the atmosphere dissolves into oceans, rivers and lakes.[3][4] To achieve chemical equilibrium, some of it reacts with the water to form carbonic acid.

About 100 million years after initial accretion of the earth

temperatures at depths of 400 to 800 km below the Earth's surface reach the melting point of iron

Captain James Cook (1728-1779)

was a British explorer, navigator, cartographer, and captain in the Royal Navy. Cook made detailed maps of Newfoundland prior to making three voyages to the Pacific Ocean, during which he achieved the first recorded European contact with the eastern coastline of Australia and the Hawaiian Islands, and the first recorded circumnavigation of New Zealand.

Viking Colonies

were in Iceland and the south of Greenland but were gone by around 1450