sources of information on climate
DESCRIPTION
Sources of information on climate. "proxy data" – indirect data on phenomenas related to climate Biological Geomorphological Physical Artefacts. Physical. Isotopes. Atomic nucleus occupies only tiny part of the whole atom. - PowerPoint PPT PresentationTRANSCRIPT
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Sources of information on climate
"proxy data" – indirect data on phenomenas related to climate Biological Geomorphological Physical Artefacts
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Physical....
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IsotopesAtomic nucleus occupies only tiny part of the whole atom.
Nucleus consists on nucleons: protons – with a positive electric charge, and neutrons – electrically neutral.
The electric charges of proton and electron are equall. The mass of nucleons is about 2000 times bigger than mass of electron, the mass of proton is slightly bigger than the mass of proton (neutron = proton + electron)Atoms with the same number of protons, but differ with the number of neutrons are called isotopes
Atomic number of element represents the number of protons in its nucleus.
Mass number of element represents the number of nucleons (protons and neutrons) in its nucleus.
Cl3717
Mass number
Atomic number
Element symbol
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Isotope measurements
Some elements can have several stable isotopes – different types of atoms with different numbers of neutrons. (Number of protons in the nucleus define the element, number of neutrons define the isotope). The more neutrons in the nuclues the haviers the atmos.
There are three stable isotopes of hydrogen, they are called: hydrogen(H), deuterium (D) i tritium (T).
HH 11 HD 2
1 HT 31
Here are also two stable isotopes of oxygen:
OO 168
16 OO 188
18
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The particle of water consists of two atoms of hydrogen and one atom of oxygen. In relation of their isotopes three different water particles can be found:
H218O, H2
16O and HD16O
Standard Mean Ocean Water (SMOW) consists in 99,76% of H216O,
in 0,2% of H218O and in 0,03% of HD16O.
1//
1000 162
16
162
16
SMOW
sample
OHOHDOHOHD
D
1//
100016
218
2
162
18218
SMOW
sample
OHOHOHOH
O
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The snow falling of Greenland glaciers has 18O in the range 23 -38‰.The snow falling of Antarctic glaciers has 18O in the range -18 -60‰.
In the case of HDO:
00018 /108 OD
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Ratio 18O/16O
Isotope 16O is lighter and evaporates faster than 18O. In normal conditions it returns to ocean together with precipitation. In glacial times 16O is trapped in the ice and a relative increase of 18O is observed in oceans. In warm periods, ice melts and the percentage of 16O increases.
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How can we use oxygen isotopes to tell air temperature in the distant past? In high latitude climates the 18O concentration in precipitation varies linearly with mean annual temperature.Assuming this relationship holds for the distant past, the 18O record in ice cores can therefore be used as a proxy for mean annual temperature at the time of precipitation of the snow on the glacier.
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During evaporation, the vapor, and hence clouds and precipitation, are poorer in 18O water than the rest of the water left behind. Precipitation preferentially removes more 18O, so later precipitation is still poorer in 18O. The tops of icecaps, which are cold and at high elevation, receive the most 18O-poor water as precipitation. 18O in ice therefore records air temperature.In contrast, the oceans accumulate excess 18O as 18O-poor water is transferred to the ice sheets. The more ice, the richer the water becomes in 18O. Foraminifera and other organisms growing from the water also become richer in 18O, so their skeletons in ocean sediment record the 18O concentration in sea water and so, indirectly, record ice volume.Ice and ocean sediment records are therefore complementary, each supplying different information about ice and ice formation.
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Volcanic eruptions leave dust and acids on the surface of glaciers. High winds over dry land blow dust onto glaciers. High winds over open ocean water produces lots of sea salt spray that can also become incorporated into glacial ice. The snow and ice itself contain oxygen and hydrogen isotopes, and bubbles of trapped air. All these can be analyzed to get an idea of what is going on around the mass of glacial ice.
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Ice cores
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Ice cores
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History of Earth climate can be History of Earth climate can be reconstructed on the basis of reconstructed on the basis of analysis of ice cores on Greenland analysis of ice cores on Greenland and Anctarctic. and Anctarctic.
• TemperaturTemperatures from measurements of es from measurements of oxygen isotopesoxygen isotopes..• Greenhouse gases in air bubbles Greenhouse gases in air bubbles trapped in ice cores. trapped in ice cores.
What we know about greenhouse gasesClimatic records in ice cores
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Lomonosovfonna drilled in April 1997121 m deep, about 800 yrsProject participants: Norway, The Netherlands, Sweden, Finland, Estonia
Holtedahlfonna(Snøfjellafonna)drilled in April 2005 125 m deep, about 400 yrsProject participants: Norway, The Netherlands, Sweden, Finland, Estonia
Svalbard Svalbard drill sitesdrill sites
Austfonna drilled in 1998 and 1999drilled in 1998 and 1999 289 m deep, about 800 yrs289 m deep, about 800 yrsProject participants: Japan, Norway
Ice cores and climate
Ice cores and climate Elisabeth Isaksson D
mitry D
ivine
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Methods of Dating Ice Cores
• Stratigraphy• Annual layers• Ratio of 18O / 16O• Electrical conductivity methods• Using volcanic eruptions as Markers
– Marker: volcanic ash and chemicals washed out of the atmosphere by precipitation
– use recorded volcanic eruptions to calibrate age of the ice-core
– must know date of the eruption
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Using specific events Using specific events for dating ice coresfor dating ice cores
Examples from Svalbard ice cores
Depth (m )
3H (Bq/kg)137Cs (mBq/kg)
0
5
10
15
20
25
0 10 20 300
20
40
60Tritium(Bq/kg)137 Cs
Lomonosovfonna 2000
1963
Kekonen and others, 2002 Pinglot and others, 2003
Volcanic eruptions Nuclear weapon tests
0
1
2
3
4
5
1770 1780 1790 1800
Year (AD)
NO
3- (eq
vL-1
)
0
10
20
30
40
SO42-
(eq
vL-1
)Laki 1783
Ice cores and climate
Ice cores and climate Elisabeth Isaksson D
mitry D
ivine
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Depth –age relationship
Ice cores have layer thinning due to pure shear which means that if sample size is consistant the number per time unit will decrease with depth
Ice cores and climate
Ice cores and climate Elisabeth Isaksson D
mitry D
ivine
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Oldest ever ice cores origin from Antarctica
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Last Glacial Maximum
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170
220
270
320
370
0200000400000600000czas (lata BP)
CO
2 (pp
m) A
ntar
ctic
a
25262728293031
SST
(°C
) Tro
pica
l Pac
ific
CO2 concentration and temperature
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time (thousand years BP)
Sea
Leve
l (m
)
200
-20-40-60-80
-100-120
Sea level during last 450 000 years
450 400 350 300 250 200 150 100 50 02526
2728
2930
31
SST
(°C
) Tro
pica
l Pac
ific
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growing glaciersdeep-seaforaminifera
Water isotopes in deep-sea coresThe “Ice Volume” effect-Light isotope removed from ocean, locked into large ice sheets. Ocean d18O shift (+1.5‰) recorded in marine carbonates that grew during glacial.
SPECMAP – standard benthic d18O record,used to date marine sediments of unknown age
shad
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Coral records of paleo-precipitation
Theory: 1) more rain = lighter d18O“amount” effect2) surface seawater d18O will become lighter3) coral d18O lighter
Cole and Fairbanks, 1990shad
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Water isotopes in speleothems (cave stalagmites)Theory: 1) δ18O of speleothem = δ18O of precipitation
2) δ8O of precipitation function of temperature (mid- to high-latitudes) and/or amount of rainfall (low latitudes)
Wang et al., Science , 2001
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After: Reconstructing & simulating past climate variability., J.F. Gonzales Rouco
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After: Reconstructing & simulating past climate variability., J.F. Gonzales Rouco
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Borehole temperature profiles in central Greenland
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Historical data
notes about harvest, corn prices blooming dates (cheeries from Japan more than 1000 years) sailing conditions (ice bergs aroud Iceland) dates of lakes freezing(Japan) notes about weather in old church cronicles (calendars) cave paintings characteristic features of houses weather descriptions
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HISTORICAL DOCUMENTS
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C. Pfister, R. Brazdil (2006)
Corn prices
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Brazdil i in., 2005
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On the wall of this house in Wertheim, Germany, there are marks of 24 high water events at riversTauber and Ren
Pfister
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Pfister
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Weather diary,Jan from Kunowice, 1538, Czech Republic
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From the diary of Marcin Biem
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Potential sources of information about temperature beforePotential sources of information about temperature before 18001800
Jones, Osborn and Briffa (2001) Science
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Potential sources of information about humidity before Potential sources of information about humidity before 18001800
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Archive measurements elementInstrumental Direct T, P, SLPHistorical Records/diaries etc. T, P, stormsTree rings Widths
DensityIsotopes
T, PTT, P
Ice cores AccumulationMelt layers
IsotopesChemical composition
PTT, PCirculation
Corals GrowthIsotopes
Chemical composition
SST, SalinitySST, SalinitySST, Salinity
caves AccumulationIsotopes
PT, P
Varves in lakes AccumulationBiological composition/pollen
TT, P
Varves in the ocean AccumulationBiological/chemical cmposition
PT, P
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Źródła wiedzy o klimacie i środowisku
Dane instrumentalne Dane historyczne Dane pośrednie
Dane pośrednie rzadko niosą informację o jednym tylko elemencie pogody (klimatu).
Odczytanie informacji wymaga datowania i kalibracji
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Cape Spear
Mariners’ logs, recording dates and positions of iceberg sightings
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pierścienie przyrostów drzew
proporcje izotopów tlenu 18O/16O w wapiennych muszlach mikroorganizmów oceanicznych
skład powietrza uwięzionego w lodzie grenlandzkim i antarktycznym
zasięgi gatunków o wyraźnych preferencjach klimatycznych
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Western Brook Pond, Gros Morne
Hearts Delight
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Okres połowicznego rozpadu
rozpad beta
rozpad alfaW wyniku rozpadu beta otrzymujemy pierwiastek o wyższej liczbie atomowej
w wyniku rozpadu alfa otrzymujemy pierwiastek o niższej liczbie atomowej
HeThU 42
23490
23892
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Fluktuacje długości Grosser Aletsch w Alpach Szwajcarskich w ciągu ostatnich 2000 lat.
Brazdil i in. 2005
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Datowanie za pomocą węgla C-14 powstawanie węgla C-14 w przyrodzie
bombardowanie atmosfery przez promieniowanie kosmiczne
Węgiel C-14 ulega rozpadowi betaokres połowicznego rozpadu węgla wynosi 5730 lat
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Źródła wiedzy o klimacie w przeszłości
"proxy data" – dane pośrednie o czynnikach zależnych od panujących warunków klimatycznych:
pierścienie przyrostów drzew
proporcje izotopów tlenu 18O/16O w wapiennych muszlach mikroorganizmów oceanicznych
skład powietrza uwięzionego w lodzie grenlandzkim i antarktycznym
zasięgi gatunków o wyraźnych preferencjach klimatycznych