Featured Research

from universities, journals, and other organizations

Impacts Of Climate Change On Lakes

Date:
October 23, 2008
Source:
Helmholtz Association of German Research Centres
Summary:
Climate change will have different effects on lakes in warmer and colder regions of the globe. This is the conclusion reached by Japanese and German researchers following studies of very deep caldera lakes in Japan.

Lake Toya is a volcanic caldera lake in Shikotsu-Toya National Park on Hokkaido Island in north of Japan.
Credit: Dr. Bertram Boehrer/UFZ

Climate change will have different effects on lakes in warmer and colder regions of the globe. This is the conclusion reached by Japanese and German researchers following studies of very deep caldera lakes in Japan.

Scientists from Hokkaido University, the Hokkaido Institute of Environmental Sciences, Kagoshima University and the Helmholtz Centre for Environmental Research (UFZ) compared current measurements with measurements taken 70 years ago. This confirmed a rise in temperatures in the deep water layers of lakes in the south of Japan, while the deep water temperatures of lakes in the north remained the same. Rising temperatures can lead to changes in nutrient exchange and turnover in the water. In certain circumstances, winter circulation behaviour can be so severely affected by rising temperatures and other climatic factors that oxygen supplies to the lower depths become insufficient for many organisms, leading to an accumulation of nutrients in the deep water, say the researchers writing in Geophysical Research Letters.

Measurements from 2005 and 2007 in deep Japanese caldera lakes provide information about the distribution of dissolved nutrients in the water. There are two reasons why this chain of lakes makes an excellent research subject for providing general information about circulation under changeable climatic conditions that will be valid for lakes outside the research area. Firstly, the lakes cover a climate gradient that stretches from the south of Japan to the northern island of Hokkaido. Secondly, oxygen and nutrient exchange between the deep water and the surface in the lakes under investigation is controlled almost exclusively by temperature differences.

The researchers found that almost all of the lakes studied displayed a good distribution of the dissolved nutrients, despite their enormous depths of up to 423 metres (Lake Tazawa, Honshu). The lakes can be divided into two main depth-circulation categories based on their climatic conditions.

The researchers expect deep water temperatures of colder lakes (e.g. Lake Shikotsu, Hokkaido) to remain unchanged in warmer winters, provided the temperature rises are not excessive, while deep water temperatures in warmer lakes are likely to rise. This was confirmed by comparisons with single-point measurements from the 1930s. The scientists warn that a very steep rise in winter temperatures over the years results in water temperatures that do not fall anywhere near as low as the temperatures of the previous years and depth circulation can cease altogether (Lake Ikeda, Kyushu). In such circumstances oxygen supplies and nutrient distribution would be interrupted, which would have impacts on organisms.

Water quality in lakes is an important economic factor for tourism, water companies and fishing businesses. Together with colleagues in Australia, Canada and Spain, UFZ scientists are therefore working on numeric lake simulation models which are designed to provide predictions about water quality under altered conditions.


Story Source:

The above story is based on materials provided by Helmholtz Association of German Research Centres. Note: Materials may be edited for content and length.


Cite This Page:

Helmholtz Association of German Research Centres. "Impacts Of Climate Change On Lakes." ScienceDaily. ScienceDaily, 23 October 2008. <www.sciencedaily.com/releases/2008/10/081021120918.htm>.
Helmholtz Association of German Research Centres. (2008, October 23). Impacts Of Climate Change On Lakes. ScienceDaily. Retrieved April 19, 2014 from www.sciencedaily.com/releases/2008/10/081021120918.htm
Helmholtz Association of German Research Centres. "Impacts Of Climate Change On Lakes." ScienceDaily. www.sciencedaily.com/releases/2008/10/081021120918.htm (accessed April 19, 2014).

Share This



More Earth & Climate News

Saturday, April 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Drought Concerns May Hurt Lake Tourism

Drought Concerns May Hurt Lake Tourism

AP (Apr. 18, 2014) Operators of recreational businesses on western reservoirs worry that ongoing drought concerns will keep boaters and other visitors from flocking to the popular summer attractions. (April 18) Video provided by AP
Powered by NewsLook.com
First Ever 'Female Penis' Discovered In Animal Kingdom

First Ever 'Female Penis' Discovered In Animal Kingdom

Newsy (Apr. 18, 2014) Not only are these newly discovered bugs' sex organs reversed, but they also mate for up to 70 hours. Video provided by Newsy
Powered by NewsLook.com
Ark. Man Finds 6-Carat Diamond At State Park

Ark. Man Finds 6-Carat Diamond At State Park

Newsy (Apr. 18, 2014) An Arkansas man has found a nearly 6.2-carat diamond, which he dubbed "The Limitless Diamond," at the Crater of Diamonds State Park. Video provided by Newsy
Powered by NewsLook.com
Deadly Avalanche Sweeps Slopes of Mount Everest

Deadly Avalanche Sweeps Slopes of Mount Everest

AP (Apr. 18, 2014) At least six Nepalese guides are dead after an avalanche swept the slopes of Mount Everest along a route used to climb the world's highest peak. (April 18) 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