Featured Research

from universities, journals, and other organizations

Earth From Space: Unique Arctic Landscape Surveyed By Proba

Date:
August 10, 2005
Source:
European Space Agency
Summary:
A new Proba image shows the region around Samoylov Island, located within the Lena River Delta on the Laptev Sea coast of Northern Siberia. The small pear-shaped island of Samoylov in the lower middle of the image is one of the Delta's more than 1 500 individual islands.

A new Proba image shows the region around Samoylov Island, located within the Lena River Delta on the Laptev Sea coast of Northern Siberia. The small pear-shaped island of Samoylov in the lower middle of the image is one of the Delta's more than 1 500 individual islands.
Credit: Image courtesy of European Space Agency

The largest Delta in the Arctic, the Lena Delta is acomplex landscape that has evolved over thousands of years. TheHolocene (the geological era extending back from the present to thelast 10 000 years) Delta incorporates parts of an older accumulationplain, dating as far back as the mid-to-late Pleistocene Era. SamoylovIsland is located in the central southern part of the Lena Delta, closeto the Delta apex. Covering an area of 1200 hectares, it isrepresentative of the active and the Holocene part of the Delta,estimated to back about 7000 years.

Various geomorphologicallevels can be distinguished in the image. The highest terraces in theimage are determined by typical wet ice-wedge polygonal tundra withnumerous ponds and small lakes, presenting a Mid Holocene deltaicaccumulation surface of frozen fluvial permafrost deposits (dark greencolours). Two lower levels are formed by Late Holocene fluvialprocesses (light green colours) and by recent shallow and very activesandbars (whitish colours).

All terraces undergo heavy changes interms of river bank erosion, island migration or thermal erosion.Another interesting feature is the presence of river ice on somesandbanks in the lower right of the scene, which remained from thespring river ice break-up approximately two weeks earlier.

Around14% of worldwide carbon is stored in permafrost soils and sediments,and scientific interest is growing in the role of tundra environmentsin the carbon cycle. In particular tundra wetlands like the Lena Deltaare considered major contributors to the global carbon balance, andanticipated to be highly sensitive to climate change.

German-Russianresearch activity has been ongoing in the Lena Delta in the last fewyears, focusing on biology, soil sciences, ecology, paleo-environmentalinvestigations and modern environmental change. The German AlfredWegener Institute for Polar and Marine Research together with theRussian Lena Delta Reserve has placed an ecological station on SamoylovIsland, and is evaluating whether to site a permanent environmentalobservatory there.

In order to better quantify carbon budgets inthe vast Lena Delta tundra wetlands, Earth Observation is being used byresearchers to upscale local field measurements, with Proba imageshelping to validate tundra surface and vegetation unit classificationbased on Landsat-7 data.

This image was acquired on 5 July 2005by the Compact High Resolution Imaging Spectrometer (CHRIS). Built byUK-based Sira Technology, CHRIS is the main payload on ESA's Probamicrosatellite, designed to acquire hyperspectral images with a spatialresolution of 18 metres across an area of 14 kilometres.

The sizeof a washing machine, Proba was originally launched in 2001 as atechnology demonstrator, but is now operated as an ESA EarthObservation Third Party Mission.


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. "Earth From Space: Unique Arctic Landscape Surveyed By Proba." ScienceDaily. ScienceDaily, 10 August 2005. <www.sciencedaily.com/releases/2005/08/050805103748.htm>.
European Space Agency. (2005, August 10). Earth From Space: Unique Arctic Landscape Surveyed By Proba. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2005/08/050805103748.htm
European Space Agency. "Earth From Space: Unique Arctic Landscape Surveyed By Proba." ScienceDaily. www.sciencedaily.com/releases/2005/08/050805103748.htm (accessed October 22, 2014).

Share This



More Earth & Climate News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Traditional Farming Methods Gaining Ground in Mali

Traditional Farming Methods Gaining Ground in Mali

AFP (Oct. 20, 2014) He is leading a one man agricultural revolution in Mali - Oumar Diatabe uses traditional farming methods to get the most out of his land and is teaching others across the country how to do the same. Duration: 01:44 Video provided by AFP
Powered by NewsLook.com
How Detroit's Money Woes Led To U.N.-Condemned Water Cutoffs

How Detroit's Money Woes Led To U.N.-Condemned Water Cutoffs

Newsy (Oct. 20, 2014) The United Nations says water is a human right, but should it be free? Detroit has cut off water to residents who can't pay, and the U.N. isn't happy. Video provided by Newsy
Powered by NewsLook.com
Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-Fuel Impala

Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-Fuel Impala

3BL Media (Oct. 20, 2014) Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-fuel Impala Video provided by 3BL
Powered by NewsLook.com
White Rhino's Death In Kenya Means Just 6 Are Left

White Rhino's Death In Kenya Means Just 6 Are Left

Newsy (Oct. 20, 2014) Suni, a rare northern white rhino at Ol Pejeta Conservancy, died Friday. This, as many media have pointed out, leaves people fearing extinction. Video provided by Newsy
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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