Miki svifryk borginni 2011-05-02

Tluvert svifryk er n borginni.

stan meal annars sandstormur fr Landeyjasandi, eins og sst myndinni a nean.

Myndin a nean snir mlingar styrk svifryks (PM10) vi Grenssveg.

MYNDIR hrhttp://turdusjardvisindi.blogspot.com/2011/05/particulate-matter-in-reykjavik-2011-05.html(komu ekki me flutningnum).


Loftgi kjlfar eldgossins Eyjafjallajkli 2010

Throstur_others_EyjoAsh

Veggspjaldi, smelli til a sj.

Veggspjald sem kynnt var rstefnu EGU Vn og Vorrstefnu Jarfraflagsins aprl 2011.

gripi ( ensku)*:

High levels of particulate matter due to ash plume and ash re-suspension following the Eyjafjallajkull eruption.

Throstur Thorsteinsson1, Thorsteinn Johannsson2 and Gudrun Petursdottir3
1Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik (ThrosturTh@gmail.com), 2The Environment Agency of Iceland, Sudurlandsbraut 24, 108 Reykjavik, 3Institute for Sustainability Studies, University of Iceland, Gimli v/ Hsklatorg, 107 Reykjavk

The dangers to people living near a volcano due to lava and pyroclastic flow, and, on ice or snow covered volcanoes, jkulhlaup (floods) are well known. The level of risk due to ash fall is, however, not as well known.

The eruption at Eyjafjallajkull, 14 April to 20 May 2010 (last day of visible plume), produced abundant particulate matter (PM). After the volcanic activity ceased high PM concentration has been measured on several occasions, due to re-suspended ash.

The particulate matter (PM10) concentration in the small town of Vk, 38 km south-east from the erupting Eyjafjallajkull volcano, reached levels that are 25 times the recommended health limit of 50 mg m-3 averaged over 24 hours, on 7 May 2010, with 10-min values reaching 13000 mg m-3. Even after the eruption, values as high as >8000 mg m-3 (10-min average), and >900 mg m-3 (24-h average), were measured.

In Reykjavik, 125 km WNW of the volcano, the PM10 concentration reached over 2000 mg m-3 (10-min average) during an ash storm event on 4 June 2010. The annual concentration in Reykjavik is about 25 mg m-3, and the only previous events of comparable magnitude are peaks during New Year's Eve celebration.

The eruption at Eyjafjallajkull posed a potential health risk to the inhabitants in the regions hit by severe ash fall. However, preliminary studies indicate that the ash has had minor short term health effects. Studies show that the crystalline silica content of the ash is negligible, so that the persistence of deposited ash in the soils and environment should not present a significant silicosis hazard. During periods of PM10 concentration over about 5000 mg m-3, most residents stayed indoors, or wore protective air filters and goggles when they had to go outside.

A study is ongoing to examine the potential long term health effects of the volcanic eruption, including the high concentration of PM10 during and after the eruption due to re-suspended ash in the area.

* Vinsamlegast hafi samband vi rst (finni tlvupstfang veggspjaldi) ef vilji vitna ea nota ggn sem birtast veggspjaldinu.


Miklir jarðskjálftar í Japan 2011-03-11

Margir strir, allt a M 8.9, jarskjlftar hafa ori vi Japan dag.

Listinn hr a nean er fenginn fr USGS og snir skjlfta af strinni M 5 og strri heiminum. Margir slkir hafa ori vi Japan, alls 16 milli 5:46 og 7:42 UTC.

20110311_JapanEarthquakes_M5over

essum skjlftum fylgir htta flbylgjum, sem egar hafa ori me allt a 10 m hrri ldu.


Botnskrið Brúarjökuls

Verkefni botnskri Brarjkuls snst um a meta og reyna a skilja mikilvgi botnskris hreyfingu jkla.

Srstaklega verur skoa hvernig botnskri breytist tma og einnig eftir stasetningu jkla.

Landsvirkjun styrkir verkefni - krar akkir.


"Ný" aðferð við kennslu

g segi n vegna ess a g hef aldrei nota hana ur og nemendur hafa ekki kynnst essari afer ur. a ir ekki a g haldi a enginn hafi gert etta ur.

essi afer snst um a lta nemendur finna frttir sem tengjast nmsefninu, setja frttina me tskringum neti og kynna fyrir bekknum.

Hver nemandi sendir inn um tvr frttir nn. Skrifa stutta tskringu og finna sm bakgrunn.

San kynna nemendur frttina, me tskringum, fyrir bekkjarflgum.

etta hefur reynst vera mjg skemmtilegt og vaki huga nemenda nmsefninu.

Snir vel hversu lifandi fgin eru, t.d. au sem g kenni og nota etta, vatnafri og jklaflri. Nemendur eru einnig oft trlega flinkir a finna skemmtilegar og spennandi frttir.

Dmi um essar frttir m finna sunum sem tengjast nmskeiunum: vatnafri hr og jklafri hr.


Mli-einingin eitthva a skolast til ?

frtt mbl.is talar Ellii Vignisson um a sorpbrennslan eigi a draga r rykmengun nir 10 milligrmm rmmetra, en segir jafnframt a "ykmengun gtum Reykjavk mlist stundum kringum 600 milligrmm,"

Hr hefur eitthva skolast til.
Hsta gildi sem mlst hefur Reykjavk er um 1500 mkr-grmm rmmetra, skustorminum 4. jn 2010, ea um 1.5 milligramm rmmetra.

N veit g ekki hvort sorpbrennslunni er tla a halda sig vi 10 milligrmm ea 10 mkr-grmm, en arna munar 1000-fldu !

(Mgulega mistk blaamanns einnig).


mbl.is Geta dregi r sorpbrennslu um 60%
Tilkynna um vieigandi tengingu vi frtt

Ensk vísindagrein um Mýraeldana 2006

N er loksins komin t greinin okkar International Journal of Remote Sensing um Mraeldana 2006, me herslu notkun gervitunglagagna.

Tluver bi hefur veri fr v a greinin var samykkt ar til hn birtist (um 18 mnuir).

Thorsteinsson, Throstur , Magnusson, Borgthor and Gudjonsson, Gudmundur. 2011.

Large wildfire in Iceland in 2006: Size and intensity estimates from satellite data.

International Journal of Remote Sensing, 32(1): 17 - 29.

To link to this Article: DOI: 10.1080/01431160903439858

URL: http://dx.doi.org/10.1080/01431160903439858

image

Dmi um notagildi gervitunglagagna. Hr er bi a reikna orkulosun eldanna fyrir tmabili 30. - 31. mars 2006.


Vindurinn ýfir upp svifryk, 4. janúar 2011

Sterkir vindar morgunsri valda hum styrk svifryks ennan morguninn, auk umferar.

essi mynd er fengin fr loftgamlistinni vi Grenssveg.


Áramótasvifrykið 2010

Svoltill vindur hjlpai miki upp loftgin essi ramtin, bi Grenss (graf hr a nean og Hvaleyrarholti).

Hsta gildi var "aeins" 350 micro-g/m3 - hefur n yfir 2000 micro-g/m3.

Nokkur vindur var sem lkkar styrkinn, og einnig er mgulegt a minna hafi veri skoti.

image

Gleilegt ntt r !


Ösku- og sandstormur þann 20. desember 2010

Enn slrkt, urrt og vindasamt suurlandi og v kjrastur fyrir sku-og sandfok.

20101220_modis_1320

Mynd tekin kl.13:05 ann 20. desember 2010.

20101220_modis_1305

Mynd tekin kl. 13:20 ann 20. desember 2010.


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