Navigation Links
Scientists seek new emphases in Arctic climate change research
Date:9/10/2009

FAIRBANKS, Alaska Much of circumpolar Arctic research focuses on the physical, direct changes resulting from climate warming such as sea ice retreat and temperature increases. "What's understudied is the living component of the Arctic and that includes humans," said Syndonia "Donie" Bret-Harte, associate professor of biology at the University of Alaska Fairbanks and co-author of a paper to be published September 11, 2009 in the journal Science.

The paper reviews current knowledge on the ecological consequences of climate change on the circumpolar Arctic and issues a call for action in several areas of global climate change research.

"Humans live in the Arctic with plants and animals and we care about the ecosystem services such as filtering water, fiber and food production and cultural values that the Arctic provides" said Bret-Harte, who specializes in Arctic plant ecology in Alaska.

The global average surface temperature has increased by 0.72 F (0.4 C) over the past 150 years and the average Arctic temperature is expected to increase by 6 C. "That's a mind bogglingly large change to contemplate and keep in mind that no one lives at the average temperature," Bret-Harte said.

The international team of scientists who collaborated on this paper reviewed dozens of research documents on the effects of circumpolar Arctic warming. They note that numerous direct effects including lengthening of growing season following a rapid spring melt, earlier plant flowering and appearance of insects following a warmer spring, deaths of newborn seal pups following melting of their under-snow birthing chambers have other, often more subtle, indirect effects on plants, animals and humans that warrants increased attention.

Understanding how changes in plant and animal populations affect each other and how they affect the physical or nonliving components of the Arctic is critical to understanding how climate warming will change the Arctic.

One effect studied intensively at the UAF Institute of Arctic Biology Toolik Field Station on Alaska's North Slope is shrub expansion on the tundra.

"Shrubs are increasing on the tundra as the climate warms and more shrubs will lead to more warming in the spring," said Bret-Harte. Snow reflects most incoming radiation, which is simply light that can transfer heat. Shrubs that stick out of the snow in spring absorb radiation and give off heat. In this positive feedback cycle, the heating of the air immediately above the snow warms the snow, causing it to melt sooner. Warmer soils lead to increased nutrient availability, which contributes to greater shrub growth, which then contributes to still more warming.

Another effect studied intensively in Alaska occurs under the snow.

"We need to better understand how winter comes and goes and how that drives shifts in plant-animal interactions," said Jeff Welker, professor of biology at the University of Alaska Anchorage. When it didn't snow at Toolik Field Station until Thanksgiving a few years ago the soil got cold and stayed cold. So cold that microbes in the soil were barely active. The spring green-up was slow in coming and likely affected caribou forage, says Welker.

In 2008, the snow started falling in September and never quit. The warmer winter soils with their active microbes were insulated from the cold and were able to provide nutrients to plants that stimulated growth.

The authors call for immediate attention to the conservation of Arctic ecosystems; understanding the ecology of Arctic winters; understanding extreme events such as wildfires and extended droughts; and the need for more baseline studies to improve predictions.

"This paper identifies gaps in our knowledge, what we need to be doing and where the public needs to spend its money," said Welker.


'/>"/>

Contact: Marie Gilbert
megilbert@alaska.edu
907-474-7412
University of Alaska Fairbanks
Source:Eurekalert

Related biology news :

1. Superscanner helps scientists see into the unknown
2. Scientists use microRNAs to track evolutionary history for first time
3. Michigan Tech scientists identify genes linked to Lou Gehrigs disease
4. Scientists discover new genetic variation that contributes to diabetes
5. Einstein scientists move closer to a safer anthrax vaccine
6. Scientists begin to untangle root cause of Alzheimers disease
7. NOAA scientists map fish habitat and movements at Grays Reef Marine Sanctuary
8. Scientists study possible responses to climate emergencies
9. Finding the ZIP-code for gene therapy: Scientists imitate viruses to deliver therapeutic genes
10. Caltech neuroscientists find brain region responsible for our sense of personal space
11. ORNL scientists hone technique to safeguard water supplies
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/16/2017)... , May 16, 2017  Veratad Technologies, LLC ... of online age and identity verification solutions, announced today ... Identity Conference 2017, May 15 thru May 17, 2017, ... Building and International Trade Center. Identity ... globe and in today,s quickly evolving digital world, defining ...
(Date:4/19/2017)... , April 19, 2017 The ... vendor landscape is marked by the presence of several ... however held by five major players - 3M Cogent, ... companies accounted for nearly 61% of the global military ... companies in the global military biometrics market boast global ...
(Date:4/13/2017)... 13, 2017 According to a new market research ... Analytics, Identity Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and ... is expected to grow from USD 14.30 Billion in 2017 to USD ... 17.3%. ... MarketsandMarkets Logo ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... , ... October 10, 2017 , ... San Diego-based team ... its corporate rebranding initiative announced today. The bold new look is part of ... the company moves into a significant growth period. , It will also expand its ...
(Date:10/10/2017)... 2017 SomaGenics announced the receipt of a ... RealSeq®-SC (Single Cell), expected to be the first commercially ... microRNAs) from single cells using NGS methods. The NIH,s ... accelerate development of approaches to analyze the heterogeneity of ... techniques for measuring levels of mRNAs in individual cells ...
(Date:10/9/2017)... ... 2017 , ... At its national board meeting in North Carolina, ARCS® ... Departments of Physics and Astronomy, has been selected for membership in ARCS Alumni ... the 2015 Breakthrough Prize in Fundamental physics for the discovery of the accelerating expansion ...
(Date:10/7/2017)... , Oct. 6, 2017  The 2017 ... of three scientists, Jacques Dubochet, Joachim Frank ... developments in cryo-electron microscopy (cryo-EM) have ... within the structural biology community. The winners worked ... can now routinely produce highly resolved, three-dimensional images ...
Breaking Biology Technology: