Featured Research

from universities, journals, and other organizations

Ash plume of Eyjafjallajoekull volcano monitored

Date:
April 22, 2010
Source:
European Space Agency
Summary:
The development of the ash plume from Iceland's Eyjafjallajoekull volcano has been tracked since March 20. In the latest Envisat image acquired April 22 at 13:36 CEST, less ash is visible.

Envisat's MERIS image of Iceland acquired on 21 April 2010 at 13:36 CEST.
Credit: ESA

The development of the ash plume from Iceland's Eyjafjallajoekull volcano between 17-20 April is tracked in this series of Envisat images.

On 17 and 19 April, the brown-coloured ash plume is visible travelling in a roughly southeasterly direction over the Atlantic Ocean by the prevailing western air current. By 20 April, much less ash is visible spewing from the volcano.

In the latest Envisat image acquired April 22 at 13:36 CEST, even less ash is visible. Envisat has been monitoring the volcano since its recent eruptions began on 20 March. To see the latest Envisat satellite images over the area, simply visit our MIRAVI website. MIRAVI, which is free and requires no registration, generates images from the raw data collected by Envisat's Medium Resolution Imaging Spectrometer (MERIS) instrument and provides them online quickly after acquisition.

MERIS images provide visual clues of what is happening over the volcano and, furthermore, can provide information on the height of the ash plume in the atmosphere.

Scientists from the Free University of Berlin have developed an experimental algorithm for the retrieval of cloud-top height from measurements taken by MERIS between 17 -- 19 April from 14:00 and 15:00 CEST.

The algorithm, which is operationally applied within the MERIS ground segment, is normally used to determine the height of clouds to support weather and precipitation forecasts. A similar algorithm, based on the exploitation of the height dependent oxygen absorption (~ 0.76 microns), is now being experimentally applied to determine the height of the ash cloud spewing from the volcanic eruption.

"We normally apply this method to clouds to determine their heights over ground. We have now applied the same technique to the ash plume from Iceland's volcano. The results show that the method works, and we can now provide the 'starting height' of the ash cloud and hope to be able to better predict the ash distribution in the future," said Prof. Juergen Fischer from the Free University of Berlin, who provided the height maps.

On 17 April, the ash plume reached a top height of more than 5 km close to its origin over the southern coast of Iceland with its top height dropping below 2 km as it travelled. On 19 April, the massive, wide-spread ash plume resided in the lower atmosphere close to the volcano with top heights below 2 km.

According to Prof. Fischer, these preliminary results agree with the volcanic plume heights established by research flights and forecasts by volcanic plume models. A more detailed algorithm dedicated to the height of volcanic ash clouds is currently under development.

Other satellite datasets as well as ground measurements are being used to measure the evolution of the ash cloud.


Story Source:

The above story is based on materials provided by European Space Agency. Note: Materials may be edited for content and length.


Cite This Page:

European Space Agency. "Ash plume of Eyjafjallajoekull volcano monitored." ScienceDaily. ScienceDaily, 22 April 2010. <www.sciencedaily.com/releases/2010/04/100422093528.htm>.
European Space Agency. (2010, April 22). Ash plume of Eyjafjallajoekull volcano monitored. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2010/04/100422093528.htm
European Space Agency. "Ash plume of Eyjafjallajoekull volcano monitored." ScienceDaily. www.sciencedaily.com/releases/2010/04/100422093528.htm (accessed August 20, 2014).

Share This




More Earth & Climate News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) — A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
Powered by NewsLook.com
Disquieting Times for Malaysia's 'fish Listeners'

Disquieting Times for Malaysia's 'fish Listeners'

AFP (Aug. 19, 2014) — Malaysia's last "fish listeners" -- practitioners of a dying local art of listening underwater to locate their quarry -- try to keep the ancient technique alive in the face of industrial trawling and the depletion of stocks. Duration: 02:29 Video provided by AFP
Powered by NewsLook.com
Wildfire Hits California's Angeles National Forest

Wildfire Hits California's Angeles National Forest

Reuters - US Online Video (Aug. 17, 2014) — A wildfire sweeps across the Angeles National Forest prompting campers to quickly leave as officials began evacuating the area -- local media. Gavino Garay reports. Video provided by Reuters
Powered by NewsLook.com
Symphony Performs at Southern Utah's Red Rocks

Symphony Performs at Southern Utah's Red Rocks

AP (Aug. 16, 2014) — The Utah Symphony hopes to complement the beauty of Utah's soaring red rocks and canyons with free desert performances near Utah's national parks this weekend. (Aug. 16) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins