Featured Research

from universities, journals, and other organizations

NASA Satellites Can See How Climate Change Affects Forests

Date:
September 12, 2006
Source:
NASA/Goddard Space Flight Center
Summary:
A NASA-funded study shows that satellites can track the growth and health of forests and detect the impact of a changing climate on them.

Evergreen conifers, a species common in the U.S. Pacific Northwest.
Credit: National Park Service

A NASA-funded study shows that satellites can track the growth and health of forests and detect the impact of a changing climate on them.

Related Articles


Although predicting how future climate change will affect forests remains uncertain, new tools, including satellite data, are giving scientists the information they need to better understand the various factors at play and how they may change forest composition and health.

Scientists have found that satellite measurements of tree species and growth in forested regions across the United States were often equivalent to those taken directly on the ground. The study relied on a sophisticated data product from NASA's MODerate-resolution Imaging Spectroradiometer (MODIS) aboard the Terra and Aqua satellites called the "enhanced vegetation index," a measure of forest productivity that can also be used to gauge the total number of tree species in a region. The data was found to be highly successful in indicating the number of tree species when compared against data compiled, for the first time, in a country-wide survey of tree species by the U.S. Department of Agriculture Forest Service.

The MODIS data also shows that the overall productivity or growth of a forest in response to weather and seasonal conditions was closely linked to the number of different tree species it contains, allowing scientists to more readily infer the effects of climate change. "In anticipation of shifts in climate, accurate measurements of forest growth and composition are becoming more important," said Richard Waring, professor emeritus of forest science at Oregon State University, Corvallis, Ore., and lead author of the study. "These new data help us better predict how forests may change so officials can implement environmental plans or regulations to lessen the impact in advance."

Woody Turner, Program Scientist at NASA Headquarters, Washington, said "this research confirms that MODIS can provide detailed, accurate information on forests over vast regions in a simple, straightforward manner, essential for forest managers in a period of changing climate."

In the past, scientists predicted the productivity of forests from computer models using climate data. Gross primary productivity is a measure of plant photosynthesis and the ability of forests to "inhale" carbon dioxide. Net productivity is the amount of energy left for plant growth following the conversion of carbon dioxide into new plant tissue.

"Such methods relied heavily on costly ground measurements and on mathematical computer models that require extensive soil and climate data, which is often imprecise," said Waring. "The data from MODIS used here may also be helpful in sorting out changes in forest health caused by land conversion or pollution rather than climate change."

The MODIS data was highly accurate in confirming the number of tree species in many regions across the United States, but it predicted more than the number currently present in the Pacific Northwest. This finding is not unexpected given the region's climate history.

A look at the area's evolutionary past suggests that about two to three million years ago, during a period known at the late Pliocene, the region rather suddenly turned cooler and drier, leading to a major die-off of many species, many of which still have not recovered. "Overall, the Pacific Northwest now supports about 60 tree species, but if not for the abrupt climate shift millions of years ago, it is likely the region's current climate would support twice that number," Waring said.

Although forests appear to be adapting to changes in today's climate, prehistoric records indicate that climate change tends to destroy established vegetation patterns and causes new ones to be formed. "It is unclear how forests will respond in the future, when climate change is likely to accelerate," said Waring.

But researchers are fairly certain there will be both winners and losers among tree species. New patterns of tree growth will emerge, some species may die but others may simply migrate and thrive.

Such shifts in the forest landscape may in turn cause more climate changes. For instance, additional warming could result if tree species like evergreen conifers move into areas that were previously treeless or snow-covered since evergreens would reflect less of the sun's energy, causing temperatures near the surface to increase.

Under another possible scenario, climate change might allow a greater number of tree species to grow in some forests, providing a natural defense against insect and disease attacks. But some of the new species could be "invasive" and threaten the overall health of the forests. Unexpected fire, insect and disease outbreaks can also further disturb forests, making them more vulnerable to invasive species. NASA's research tools like MODIS are giving scientists the detailed information they need to better understand such possibilities, vital for improving predictions and preparedness.

The study appears in the July 2006 issue of the journal Remote Sensing of Environment.


Story Source:

The above story is based on materials provided by NASA/Goddard Space Flight Center. Note: Materials may be edited for content and length.


Cite This Page:

NASA/Goddard Space Flight Center. "NASA Satellites Can See How Climate Change Affects Forests." ScienceDaily. ScienceDaily, 12 September 2006. <www.sciencedaily.com/releases/2006/08/060830075624.htm>.
NASA/Goddard Space Flight Center. (2006, September 12). NASA Satellites Can See How Climate Change Affects Forests. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2006/08/060830075624.htm
NASA/Goddard Space Flight Center. "NASA Satellites Can See How Climate Change Affects Forests." ScienceDaily. www.sciencedaily.com/releases/2006/08/060830075624.htm (accessed December 20, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Saturday, December 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Lava on Track to Hit Hawaii Market

Raw: Lava on Track to Hit Hawaii Market

AP (Dec. 19, 2014) Lava from an active volcano on Hawaii's Big Island slowed slightly but stayed on track to hit a shopping center in the small town of Pahoa. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Birds Might Be Better Meteorologists Than Us

Birds Might Be Better Meteorologists Than Us

Newsy (Dec. 19, 2014) A new study suggests a certain type of bird was able to sense a tornado outbreak that moved through the U.S. a day before it hit. Video provided by Newsy
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Arctic Warming Twice As Fast As Rest Of Planet

Arctic Warming Twice As Fast As Rest Of Planet

Newsy (Dec. 18, 2014) The Arctic is warming twice as fast as the rest of the planet, thanks in part to something called feedback. 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