Bloggfrslur mnaarins, ma 2010

Fljgandi diskur yfir Eyjafjallajkli - ea bara fljgandi hringur...

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Pff...Pff...

a var engu lkara en jkullinn hefi veri a reykja risastran vindil egar fallegur hringur steig upp af honum. Hringurinn nist mynd og um hann hefur m.a. veri fjalla Spaceweather.com, What is Up With That og Daily Mail.

Myndirnar sem pra pistilinn tku Steve og Donna O'Meara.
Sj VolcanoHeaven.tumblr.com

Nu einhverjir slendingar myndum af essu sjaldgfa fyrirbri?

(Uppfrt 31. ma: Sj athugasemd #3 fr Reyni lafssyni).

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Ef maur vill prfa sjlfur a gera svona hringi, er anna hvort a vera sr ti um stran vindil, ea enn betra a sma svona grju:


Svo eru sumir enn snjallari. Sj essa mekilegu mynd YouTube. Hfrungar leika sr a v a gera svona hringi neansjvar.


Allar hinar fjlmrgu gnir loftslagshlnunarinnar...

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Bloggaranum hefur stundum veri legi hlsi fyrir a gera lti r meintri hnatthlnun af mannavldum, en eins og flestir vita hefur fr lokum litlu saldar fyrir 150 rum hlna um v sem nst 0,8 grur Celcus. Sem betur fer. vilja margir meina, en ekki eru allir jafn ngir me essa hlnun sem nemur svo sem 0,006 grum ri a mealtali. Hluti af mannavldum og hluti af nttrunnar vldum.

Sem sagt, bloggarinn vill bta aeins fyrir misgjrir snar og birta langan lista yfir fjlmargar greinar sem sna okkur vi hverjar gnir er a eiga. Vonandi eru flestar krkjurnar virkar, en a er n einusinni annig a r eiga til a gufa upp fyrirvaralaust. Reyni a smella nokkrar eirra sem eru listanum hr fyrir nean, sumt er einstaklega frlegt, t.d. asteroid strike risk:

Acne, agricultural land increase, Afghan poppies destroyed, African holocaust, aged deaths, poppies more potent, Africa devastated, Africa in conflict, African aid threatened,African summer frost, aggressive weeds, Air France crash, air pressure changes, airport farewells virtual, airport malaria, Agulhas current, Alaskan towns slowly destroyed, Al Qaeda and Taliban Being Helped, allergy increase, allergy season longer, alligators in the Thames, Alps melting, Amazon a desert, American dream end, amphibians breeding earlier (or not), anaphylactic reactions to bee stings, ancient forests dramatically changed, animals head for the hills, animals shrink, Antarctic grass flourishes, Antarctic ice grows, Antarctic ice shrinks, Antarctic sea life at risk, anxiety treatment, algal blooms, archaeological sites threatened, Arctic bogs melt, Arctic in bloom, Arctic ice free, Arctic ice melt faster, Arctic lakes disappear, Arctic tundra lost, Arctic warming (not), a rose by any other name smells of nothing, asteroid strike risk, asthma, Atlantic less salty, Atlantic more salty, atmospheric circulation modified, attack of the killer jellyfish, avalanches reduced, avalanches increased, Baghdad snow, Bahrain under water, bananas grow, barbarisation, bats decline, beer and bread prices to soar, beer better, beer worse, beetle infestation, bet for $10,000, big melt faster, billion dollar research projects, billion homeless, billions face risk, billions of deaths, bird distributions change, bird loss accelerating, bird strikes, bird visitors drop, birds confused, birds decline (Wales), birds driven north, birds face longer migrations, birds return early, birds shrink(Aus), birds shrink (USA), bittern boom ends, blackbirds stop singing, blackbirds threatened, Black Hawk down, blizzards, blood contaminated, blue mussels return, borders redrawn, bluetongue, brain eating amoebae, brains shrink, bridge collapse (Minneapolis), Britain one big city, Britain Siberian,Britain's bananas, British monsoon, brothels struggle, brown Ireland, bubonic plague, Buddhist temple threatened, building collapse, building season extension, bushfires, butterflies move north,butterflies reeling, carbon crimes, camel deaths, cancer deaths in England, cannibalism, caterpillar biomass shift, cave paintings threatened, childhood insomnia, Cholera, circumcision in decline, cirrus disappearance, civil unrest, cloud increase, coast beauty spots lost, cockroach migration,cod go south, coffee threatened, coffee berry borer, coffee berry disease, cold climate creatures survive, cold spells (Australia), cold wave (India), cold weather (world), computer models, conferences, conflict, conflict with Russia, consumers foot the bill, coral bleaching, coral fish suffer, coral reefs dying, coral reefs grow,coral reefs shrink,coral reefs twilight, cost of trillions, cougar attacks,crabgrass menace, cradle of civilisation threatened, creatures move uphill, crime increase, crocodile sex, crops devastated, crumbling roads, buildings and sewage systems, curriculum change, cyclones (Australia), danger to kid's health, Dartford Warbler plague, deadly virus outbreaks, death rate increase (US), deaths to reach 6 million, Dengue hemorrhagic fever, depression, desert advance, desert retreat, destruction of the environment, dig sites threatened, disasters, diseases move north, dog disease, dozen deadly diseases - or not, drought, ducks and geese decline, dust bowl in the corn belt, earlier pollen season, Earth axis tilt, Earth biodiversity crisis, Earth dying, Earth even hotter, Earth light dimming, Earth lopsided, Earth melting, Earth morbid fever, Earth on fast track, Earth past point of no return, Earth slowing down, Earth spins faster, Earth to explode, earth upside down, earthquakes, earthquakes redux, El Nio intensification, end of the world as we know it, erosion, emerging infections, encephalitis, English villages lost, equality threatened, Europe simultaneously baking and freezing,eutrophication, evolution accelerating, expansion of university climate groups, extinctions: (human, civilisation,koalas, logic, Inuit, smallest butterfly, cod, penguins, pikas, polar bears, possums, walrus,tigers, toads,turtles, plants, ladybirds, rhinoceros, salmon, trout, wild flowers, woodlice, a million species, half of all animal and plant species,mountain species, not polar bears, barrier reef, leaches, salamanders, tropical insects) experts muzzled, extreme changes to California, fading fall foliage, fainting, famine,farmers benefit, farmers go under, farm output boost,farming soil decline, fashion disaster, fever, figurehead sacked, fir cone bonanza, fires fanned in Nepal, fish bigger, fish catches drop, fish downsize, fish deaf, fish get lost, fish head north, fish shrinking, fish stocks at risk, fish stocks decline, five million illnesses, flesh eating disease, flies on Everest, flood patterns change, floods, floods of beaches and cities, flood of migrants, flood preparation for crisis, flora dispersed, Florida economic decline, flowers in peril, fog increase in San Francisco, fog decrease in San Francisco, food poisoning,food prices rise, food prices soar, food security threat (SA),football team migration, forest decline, forest expansion, foundations threatened, frog with extra heads, frosts, frostbite, frost damage increased, fungi fruitful, fungi invasion, games change, Garden of Eden wilts, geese decline in Hampshire, genetic changes, genetic diversity decline, gene pools slashed, geysers imperiled, giant icebergs (Australia), giant oysters invade, giant pythons invade, giant squid migrate, gingerbread houses collapse, glacial earthquakes, glacial retreat, glacier grows (California), glaciers on Snowden, glacier wrapped, global cooling, glowing clouds, golf course to drown, golf Masters wrecked, grain output drop (China), grain output stagnating (India), grandstanding, grasslands wetter, gravity shift, Great Barrier Reef 95% dead, Great Lakes drop, great tits cope, greening of the North, Grey whales lose weight, Gulf Stream failure, habitat loss, haggis threatened, Hantavirus pulmonary syndrome, harvest increase, harvest shrinkage, hay fever epidemic, health affected, health of children harmed, health risks, health risks (even more), heart disease, heart attacks and strokes (Australia), heat waves, hedgehogs bald, hibernation affected, hibernation ends too soon, hibernation ends too late, homeless 50 million, hornets, human development faces unprecedented reversal, human fertility reduced, human health risk, human race oblivion, hurricanes, hurricane reduction, hurricanes fewer, hurricanes more intense, hurricanes not, hydropower problems, hyperthermia deaths, ice age, ice sheet growth, ice sheet shrinkage,icebergs, illness and death, inclement weather, India drowning, infrastructure failure (Canada), indigestion, industry threatened, infectious diseases, inflation in China, insect explosion, insect invasion, insurance premium rises, Inuit displacement, Inuit poisoned, Inuit suing, invasion of alien worms, invasion of Antarctic aliens, invasion of Asian carp, invasion of cats, invasion of crabgrass, invasion of herons, invasion of jellyfish, invasion of king crabs, invasion of lampreys, invasion of midges,invasion of slugs, island disappears, islands sinking, Italy robbed of pasta, itchier poison ivy, Japan's cherry blossom threatened, jellyfish explosion, jet stream drifts north, jets fall from sky, Kew Gardens taxed, kidney stones, killer cornflakes, killing us, kitten boom, koalas under threat, krill decline, lake and stream productivity decline, lake empties, lake shrinking and growing, landslides, landslides of ice at 140 mph, large trees decline, lawsuits increase,lawsuit successful, lawyers' income increased (surprise surprise!), lawyers want more, legionnaires' surge, lives lost, lives saved, Loch Ness monster dead, locust plagues suppressed, low oxygen zones threaten sea life, lush growth in rain forests, Lyme disease, Malaria, malnutrition, mammoth dung melt, mango harvest fails, Maple production advanced, Maple syrup shortage, marine diseases, marine food chain decimated, Meaching (end of the world), Meat eating to stop, Mediterranean rises, megacryometeors, Melanoma, Melanoma decline, mental illness, methane emissions from plants, methane burps, methane runaway, melting permafrost, Middle Kingdom convulses, migration, migratory birds huge losses, microbes to decompose soil carbon more rapidly, minorities hit, monkeys at risk, monkeys on the move, Mont Blanc grows, monuments imperiled, moose dying, more bad air days, more research needed,mortality increased, mosquitoes adapting, mountain (Everest) shrinking, mountaineers fears, mountains break up, mountains green and flowering, mountains taller, mortality lower, murder rate increase, musk ox decline, Myanmar cyclone, narwhals at risk, National Parks damaged, National security implications, native wildlife overwhelmed, natural disasters quadruple, new islands, next ice age, NFL threatened, Nile delta damaged, noctilucent clouds, no effect in India,Northwest Passage opened, nuclear plants bloom,oaks dying, oaks move north, oblivion, ocean acidification, ocean acidification faster, ocean dead spots, ocean dead zones unleashed, ocean deserts expand, ocean salt extremes, ocean waves speed up, Olympic Games to end, opera house to be destroyed, outdoor hockey threatened, oxygen depletion zones, ozone repair slowed, ozone rise, penguin chicks frozen, penguin chicks smaller, penguins replaced by jellyfish, personal carbon rationing,pest outbreaks, pests increase,phenology shifts, pines decline, pirate population decrease, plankton blooms, plankton wiped out, plants lose protein, plants march north,plants move uphill, polar bears aggressive,polar bears cannibalistic, polar bears deaf, polar bears drowning, polar tours scrapped, popcorn rise, porpoise astray, profits collapse,psychiatric illness, puffin decline, pushes poor women into prostitution, rabid bats, radars taken out, railroad tracks deformed, rainfall increase, rape wave, refugees, reindeer endangered, reindeer larger, release of ancient frozen viruses, resorts disappear, rice threatened, rice yields crash, rift on Capitol Hill, rioting and nuclear war, river flow impacted, rivers raised, road accidents, roads wear out, robins rampant, rocky peaks crack apart, roof of the world a desert, rooftop bars, Ross river disease, ruins ruined, Russia under pressure, salinity reduction, salinity increase, Salmonella, salmon stronger, satellites accelerate, school closures, sea level rise, sea level rise faster, seals mating more, seismic activity, sewer bills rise, severe thunderstorms, sex change, sexual disfunction, sexual promiscuity, shark attacks, sharks booming, sharks moving north, sheep change colour, sheep shrink, shop closures, short-nosed dogs endangered, shrimp sex problems, shrinking ponds, shrinking sheep, shrinking shrine, Sidney Opera House wiped out, ski resorts threatened, slavery, slow death, smaller brains, smelt down, smog, snowfall decrease, snowfall increase, snowfall heavy, snow thicker, soaring food prices, societal collapse, soil change, songbirds change eating habits, sour grapes, space problem, spectacular orchids, spiders getting bigger, spiders invade Scotland, squid larger, squid population explosion, squid tamed, squirrels reproduce earlier, stingray invasion, storms wetter, stratospheric cooling, street crime to increase,subsidence, suicide, swordfish in the Baltic, Tabasco tragedy, taxes, tectonic plate movement, terrorists (India), thatched cottages at risk, threat to peace, ticks move northward (Sweden), tides rise, tigers eat people, tomatoes rot, tornado outbreak, tourism increase, toxic seaweed, trade barriers, trade winds weakened, traffic jams, transportation threatened, tree foliage increase (UK), tree growth slowed, tree growth faster, trees in trouble, trees less colourful, trees more colourful, trees lush, trees on Antarctica, treelines change, tropics expansion, tropopause raised, truffle shortage,truffles down, turtles crash, turtle feminised, turtles lay earlier, UFO sightings, UK coastal impact, UK Katrina, Vampire moths, Venice flooded, violin decline, volcanic eruptions,volcanoes awakened in Iceland, walrus pups orphaned, walrus stampede, wars over water, wars sparked, wars threaten billions, wasps, water bills double, water scarcity (20% of increase), water shortage to increase vegetarianism, wave of natural disasters, waves bigger, weather out of its mind, weather patterns awry, weather patterns last longer, Western aid cancelled out, West Nile fever, whale beachings, whales lose weight, whales move north, whales wiped out, wheat yields crushed in Australia, wildfires,wind shift, wind reduced, winds stronger, winds weaker, wine - Australian baked, wine - harm to Australian industry, wine industry damage (California), wine industry disaster (US), wine - more English, wine - England too hot, wine -German boon, wine - no more French , wine pass (Napa), wine - Scotland best, wine stronger, winters in Britain colder, winter in Britain dead, witchcraft executions, wolverine decline, wolves eat more moose, wolves eat less, workers laid off, World at war, World War 4, World bankruptcy, World-famous places threatened, World in crisis, World in flames, Yellow fever, zebra mussel threat, zoonotic diseases.

Auvita verur a rannsaka ll hrif hins mikla blrabgguls. Vst er etta gnarlangur listi og v hljta gnirnar a vera miklar. A minnsta kosti margar... Samt er a n einhvern vegin svo a bloggarinn er mjg akkltur fyrir a ekki skuli vera eins kalt Frni og fyrir 150 rum. a er auvita bara eigingirni, sem lesendur bloggsins eru auvita hjartanlega sammla, er ekki svo?


Gta:

Gerum r fyrir a myndin efst sunni s tekin nkvmlega norurplnum: hvaa tt er bjssi a horfa?

Vonandi verur sumari hltt og gott. a var ekki amalegt a njta tuttugu stiga hitans Hvtasunnuhelgina sem er a la, og fylgjast me grrinum sem kunni sr ekki lti. Horfa grasi spretta og trn laufgast... Og setja me eigin hendi niur 160 ltil tr sem eiga eftir a vaxa og dafna komandi rum, nrast koltvsringi og njta sumarhitans... Hver veit nema a veri gntt af hvorutveggja, en ktist a minnsta kosti blessaur grurinn... a er nefnilega ekki allt neikvtt, svo a fyrirsgn pistilsins s dlti gnvnleg Smile.


Mamma, af hverju er himinninn blr...?

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Mamma, af hverju er himinninn blr? annig spuri Ari litli hugljfu kvi Stefns Jnssonar, Aravsur, en hva prir ga vsindamenn? Hvers konar vsindamenn eru a sem ekki stta sig vi "samdma lit vsindamanna" og halda fram a spyrja spurninga? ora a ganga mti straumnum. Hvers vegna vera sumir brautryjendur sinni grein og bylta hinu samdma liti? Breyta heiminum, oft svo um munar.

Hvernig hugsa sannir vsindamenn? eir halda fram a spyrja spurninga og leita svara. eir eru aldrei ngir me svrin, heldur alltaf haldnir kvenum efa. Kannski er a ess vegna sem sumir vilja kalla efasemdarmenn, en a er einmitt aall sannra vsindamanna.

The important thing is not to stop questioning. Curiosity has its own reason for existing.
One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery every day. Never lose a holy curiosity. -
Albert Einstein.

Hann Ari litli hefi rugglega ori gur vsindamaur. Kannski var hann einmitt slkur, hver veit?

Hann Ari er ltill,
hann er tta ra trtill
me augu mjg falleg og skr.
Hann er bara stur
jafnvel eins er hann grtur
og hugljfur egar hann hlr.
En spurningum Ara
er ei auvelt a svara.
Mamma, af hverju er himinninn blr?
Sendir Gu okkur jlin?
Hve gmul er slin?
Pabbi, hv hafa hundarnir hr?


Bi pabba og mmmu
og afa og mmu
reytir endalaust spurninga su.
Hvar er slin um ntur?
Hv er sykurinn stur?
Afi, gegndu, hver skapai Gu?
Hvar er heimsendir, amma?
Hva er eilfin, mamma?
Pabbi, af hverju vex r skegg?
Hv er afi svo feitur?
Hv er eldurinn heitur?
Hv eiga ekki hanarnir egg?


a ykknar Ara
ef au ekki svara
og verur hann ekki rr.
Svo heldur en egja
au svara og segja:
veist a er veruru str.
Fyrst hik er svari
hugsar hann Ari
og hallar kannski undir flatt
og litla stund egir,
a lokum hann segir:
i eigi a segja mr satt.

Stefn Jnsson

Vst er a, Ari hefur rugglega veri gott efni vsindamann. Hann kunni nefnilega a spyrja spurninga og var hrddur vi a varpa eim fram. a er ekki alltaf vel lii egar fullornir vsindamenn spyrja gilegra spurninga eins og Einstein minnti okkur :

Great spirits have always encountered violent opposition from mediocre minds. The mediocre mind is incapable of understanding the man who refuses to bow blindly to conventional prejudices and chooses instead to express his opinions courageously and honestly-


g ska ykkur grar Hvtasunnuhelgar, og fyrir alla muni svari brnum ykkar og barnabrnum betur en fullorna flki svarai Ara litla forum. Varveiti einnig barni hjrtum ykkar sjlfra og htti ekki a spyrja spurninga... Htti ekki a efast.

Einstein, Bohr, Darwin, Pasteur, Freud, Galileo, Lavosier, Kepler, Copernicus, Faraday, Maxwell, Bernard, Boas, Heisenberg, Pauling, Schrdinger, Rutherford, Dirac, TycoBrahe, Boltzman, MarieCurie, Herchel, Laplace, Wegener, Euclid, Archimeds, ...
... ... ...
...


slenska birki Englandi...

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Myndin af birkinu er tekin 1. ma.

Hvernig skyldi slenska birki rfast Suur-Englandi? Hvenr tli a laufgist vorin og hvenr fr a haustliti?

gari einum sunnarlega Englandi eru nokkrar birkiplntur sem planta var tilraunaskyni vori 2007. Kannski ekki beinlnis tilraunaskyni, og ... Kvmi er Embla. Embla er birkistofn sem rktaur var af fallegum murtrjm hfuborgarsvinu. Frlegt verur a fylgjast me hvernig essum plntum reiir af nstu rum.

Vi skoun plntunum um mnaamtin aprl/ma leyndi sr ekki a eim lur afskaplega vel. Vxturinn hefur veri hraur, n ess a a plnturnar beri ess merki. Laufblin voru einstaklega falleg. r eru alls ekki mjg renglulegar. Lta t sem heilbrigar og fallegar plntur, sem arf a klippa til. Gaman verur a fylgjast me essum trjm nstu rum.

vor byrjuu plnturnar a laufgast um mijan mars, en sastlii haust voru haustlitirnir v sem nst um svipa leyti og slandi. Eiginlega ttu eir sem standa a essu fikti alveg eins von a birki fylgdi systkinum snum slandi vor og haust, en svo virist ekki vera. Birki laufgast fyrr en brur ess og systur Frni. Frlegt verur a fylgjast betur me essu nstu r.

Plnturnar voru ekki har loftinu vori 2007. Aeins um 10 sentmetrar ofan jarar. N, rttum tveim rum seinna, er strsta plantan orin um einn metri h. Hinar heldur minni, en gum vexti. Vaxa meira verveginn. Miklu betri vxtur en maur a venjast hrlendis.

Myndin efst sunni snir vel hve falleg laufblin voru, og myndin hr fyrir nean er af strstu plntunni. Nesta myndin er af birki hfuborgarsvinu 10. ma, ea tu dgum eftir a hinar myndirnar voru teknar...

Embla  Englandi

Plantan er um 100 cm h. Var 10 cm vori 2007.

essi einfalda tilraun snir okkur vel hve grur slandi erfitt uppdrttar og hve vel hann bregst vi hlnandi veurfari. a munar um hverja gru, en ar sem birkiplntunum var planta er hitinn oft um 10 grum hrri en hr. Sumari ar er sex mnuir, en ekki rmar sex vikur - ea annig... a er v engin fura a Emblunni li vel.

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Svona leit birki t slandi 10 ma.

Fyrir rsundi var landi okkar vii vaxi milli fjalls og fjru, enda var lka hltt og dag. Skgarmrk voru hrra og trjgrur x ar sem n eru aunir einar. N m sj ess merki a birki s aftur fari a nema land ltt grnum svum, jafnvel grnum melum. a getum vi meal annars akka hlnandi loftslagi undanfarna ratugi. Vonandi verur ekki lt ar . Minnka beitarlag hefur einnig haft miki a segja. Vntanlega hafa skgarplntunar litlu einnig kunna a meta vel burinn CO2 sem grri hefur borist auknum mli me loftinu...

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World Meterological Organization:

Climatological Information London
MonthMean Temperature oCMean Total Rainfall (mm) Mean Number of Rain Days
Daily
Minimum
Daily
Maximum
Jan2.47.25314.8
Feb2.57.63610.8
Mar3.810.34813.4
Apr5.613.04712.7
May8.717.05112.5
Jun11.620.35010.5
Jul13.722.34810.1
Aug13.421.95410.9
Sep11.419.15310.5
Oct8.915.25711.6
Nov5.110.45714.0
Dec3.48.25713.2

Climatological Information Reykjavk
MonthMean Temperature oCMean Total Precipitation (mm) Mean Number of Precipitation Days
Daily
Minimum
Daily
Maximum
Jan-3.01.975.613.3
Feb-2.12.871.812.5
Mar-2.03.281.814.4
Apr0.45.758.312.2
May3.69.443.89.8
Jun6.711.750.010.7
Jul8.313.351.810.0
Aug7.913.061.811.7
Sep5.010.166.512.4
Oct2.26.885.614.5
Nov-1.33.472.512.5
Dec-2.82.278.713.9

Mnuir ar sem meal daglegi hmarkshitinn er um og yfir 10 eru merktir me rum lit.


Um hlindin mildum -- Gagnvirkt heimskort...

Me v a smella hr er hgt a opna "lifandi" tgfu af essari merkilegu mynd sem ltur lti yfir sr. gagnvirka heimskortinu sem opnast er fjldi raura punkta og lti lnurit tengt hverjum punkti. Lnuriti snir hitaferil fyrir vikomandi sta, og ar m sj hvernig hitastigi var lklega fyrir rsundi ea lengur. Prfi a lta msarbendilinn svfa yfir kortinu.

Ef smellt er einhvern punktanna opnast n sa ar sem sj m grip vikomandi vsindagreinar og tilvsun hvar hn hefur birst. a er v hgt a nlgast frumheimildir. Jafnvel m nlgast r beint me vieigandi krkju.

Kosturinn vi essa framsetningu er a auveldara er a f einhverja hugmynd um hvort hlindin mildum hafi veri hnattrnt fyrirbri ea ekki, og hvort lka hltt hafi veri og n.

vefsunni CO2 Science.org er gangi verkefni ar sem fjalla er um fjlda svona frigreina eftir 827 vsindamenn hj 491 rannsknarstofn 43 lndum. Aeins hluti eirra kemur fram kortinu hr a ofan, en flestar sjst essu korti sem einnig er gagnvirkt. Me v a skruna inn sland ar m finna 8 rannsknir. Um verkefni Medieval Warm Period Project m einnig lesa essum bloggpistli: Hlindin miklu fyrir 1000 rum ...

essi pistill fjallar eingngu um a sem gerist sustu rsundum, en ekki um a sem gti veri vndum. Hann fjallar v alls ekki um loftslagsml ntmans. Hfum huga or Einars Benediktssonar Aldamtalji hans sem gtu (me sm trsnningi) tt vi: A fort skal hyggja, ef frumlegt skal byggja, n frslu ess lina sjest ei hva er ntt...

Hfum einnig huga a eingngu er um a ra beinar mlingar (proxy) hitastigi sem gefa okkur frekar nkvma mynd af hitafarinu, v hitamlar voru ekki fundnir upp fyrr en 17. ld. Ef aftur mti mrgum ferlum, ar sem mismunandi og har aferir eru notaar, ber nokkurn vegin saman, eykst tiltr okkar a heildarmyndin sem vi sjum s rtt. Me etta huga er frlegt a skoa hva rannsknir vsindamanna gefa til kynna.

͠ pistlinum er engin afstaa tekin til ess hve rttar niurstur essara vsindamanna eru, en bent skal a str hluti rannknagreinarnnna er ritrndur (peer review, jafningjarni) og v vntanlega vandaur.

Dmi til a sj hvernig etta virkar:

Ef vi smellum einn punktanna vi sland birtist t.d. svona vefsa um rannsknir Stra Viarvatni:

(Prfi lka a smella "Link to Paper", "Full Text" og CO2-Science lgi hr fyrir nean).

Climate of the Little Ice Age and the past 2000 years in northeast Iceland inferred from chironomids and other lake sediment proxies

Axford, Y., Geirsdottir, A., Miller, G.H. and Langdon, P.G. 2009; Journal of Paleolimnology 41: 7-24

Abstract

A sedimentary record from lake Stora Viarvatn in northeast Iceland records environmental changes over the past 2000years. Downcore data include chironomid (Diptera: Chironomidae) assemblage data and total organic carbon, nitrogen, and biogenic silica content. Sample scores from detrended correspondence analysis (DCA) of chironomid assemblage data are well correlated with measured temperatures at Stykkishlmur over the 170year instrumental record, indicating that chironomid assemblages at Stora Viarvatn have responded sensitively to past temperature changes. DCA scores appear to be useful for quantitatively inferring past temperatures at this site. In contrast, a quantitative chironomid-temperature transfer function developed for northwestern Iceland does a relatively poor job of reconstructing temperature shifts, possibly due to the lakes large size and depth relative to the calibration sites or to the limited resolution of the subfossil taxonomy. The pre-instrumental climate history inferred from chironomids and other paleolimnological proxies is supported by prior inferences from historical documents, glacier reconstructions, and paleoceanographic studies. Much of the first millennium AD was relatively warm, with temperatures comparable to warm decades of the twentieth century. Temperatures during parts of the tenth and eleventh centuries AD may have been comparably warm. Biogenic silica concentrations declined, carbon:nitrogen ratios increased, and some chironomid taxa disappeared from the lake between the thirteenth and nineteenth centuries, recording the decline of temperatures into the Little Ice Age, increasing soil erosion, and declining lake productivity. All the proxy reconstructions indicate that the most severe Little Ice Age conditions occurred during the eighteenth and nineteenth centuries, a period historically associated with maximum sea-ice and glacier extent around Iceland.



Bloggpistill: Hlindin miklu fyrir 1000 rum ...

Vefsan CO2 Science

Anna gagnvirkt kort sunni Medieval Warm Period Project.




Höfundur

Ágúst H Bjarnason
Ágúst H Bjarnason

Verkfr. hjá Verkís.
agbjarn-hjá-gmail.com

Audiatur et altera pars

Aðeins málefnalegar athugasemdir, sem eiga ótvíætt við efni viðkomandi pistils, og skrifaðar án skætings og neikvæðni í garð annarra, og að jafnaði undir fullu nafni, verða birtar. 

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