Amplified Greenhouse Effect Shaping North Into South

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An international team of 21 authors from 17 institutions in seven countries has just published a study in the journal Natural Climate Change showing that, as the cover of snow and ice in the northern latitudes has diminished in recent years, the temperature over the northern land mass has increased at different rates during the four seasons, causing a reduction in temperature and vegetation seasonality in this area. In other words, the temperature and vegetation at northern latitudes increasingly resembles those found several degrees of latitude farther south as recently as 30 years ago.

The NASA-funded study, based on newly improved ground and satellite data sets, examines 

critically the relationship between changes in temperature and vegetation productivity in 

northern latitudes.


On the amplified greenhouse effect, Prof. Ranga Myneni, Department of Earth and 
Environment, Boston University and lead co-author says "A greenhouse effect initiated by 
increased atmospheric concentration of heat-trapping gasses -- such as water vapor, carbon 
dioxide and methane -- causes the Earth's surface and nearby air to warm. The warming 
reduces the extent of polar sea ice and snow cover on the large land mass that surrounds the 
Arctic ocean, thereby increasing the amount of solar energy absorbed by the no longer energy-
reflecting surface. This sets in motion a cycle of positive reinforcement between warming and 
loss of sea ice and snow cover, thus amplifying the base greenhouse effect."


"The amplified warming in the circumpolar area roughly above the Canada-USA border is 
reducing temperature seasonality over time because the colder seasons are warming more 
rapidly than the summer," says Liang Xu, a Boston University doctoral student and lead co-
author of the study.

"As a result of the enhanced warming over a longer ground-thaw season, the total amount of 
heat available for plant growth in these northern latitudes is increasing. This created during the 
past 30 years large patches of vigorously productive vegetation, totaling more than a third of 
the northern landscape -- over 9 million km2, which is roughly about the area of the USA -- 
resembling the vegetation that occurs further to the south," says Dr. Compton Tucker, Senior 
Scientist, NASA's Goddard Space Flight Center, Greenbelt, Maryland.

The authors measured seasonality changes using latitude as a yardstick. They first defined 
reference latitudinal profiles for the quantities being observed and then quantified changes in 
them over time as shifts along these profiles.
"Arctic plant growth during the early-1980s reference period equaled that of lands north of 64 
degrees north. Today, just 30 years later, it equals that of lands above 57 degrees north -- a 
reduction in vegetation seasonality of about seven degrees south in latitude," says co-author 
Prof. Terry Chapin, Professor Emeritus, University of Alaska, Fairbanks. "This manner of 
analyses suggested a decline in temperature and vegetation seasonality of about four to seven 
degrees of latitude during the past 30 years," says co-author Eugenie Euskirchen, Research 
Professor, University of Alaska, Fairbanks.

"The reduction of vegetation seasonality, resulting in increased greenness in the Arctic, is 
visible on the ground as an increasing abundance of tall shrubs and tree incursions in several 
locations all over the circumpolar Arctic," says co-author Terry Callaghan, Professor, Royal 
Swedish Academy of Sciences and the University of Sheffield, UK. He notes that the greening 
in the adjacent Boreal areas is much less conspicuous in North America than in Eurasia.

A key finding of this study is an accelerating greening rate in the Arctic and a decelerating rate 
in the boreal region, despite a nearly constant rate of temperature seasonality diminishment in 
these regions over the past 30 years. "This may portend a decoupling between growing 
season warmth and vegetation productivity in some parts of the North as the ramifications of 
amplified greenhouse effect -- including permafrost thawing, frequent forest fires, outbreak of 
pest infestations, and summertime droughts -- come in to play," says co-author Hans 
Tømmervik, Senior Researcher, Norwegian Institute for Nature Research, Tromsø, Norway.

According to the authors, the future does indeed look troubling: Based on analysis of 17 state-
of-the-art climate model simulations, diminishment of temperature seasonality in these regions 
could be more than 20 degrees in latitude by the end of this century relative to the 1951-1980 
reference period. The projected temperature seasonality decline by these models for the 2001-
2010 decade is actually less than the observed decline. "Since we don't know the actual 
trajectory of atmospheric concentration of various agents capable of forcing a change in 
climate, long-term projections should be interpreted cautiously," says co-author Bruce 
Anderson, Professor of Earth and Environment at Boston University.

"These changes will affect local residents through changes in provisioning ecosystem services 
such as timber and traditional foods," says Research Professor Bruce Forbes, University of 
Lapland, Rovaniemi, Finland. They will also impact the global community through changes in 
regulatory ecosystem services relating to emissions of greenhouse gases. "The soils in the 
northern land mass potentially can release significant amounts of greenhouse gases which are 
currently locked up in the permanently frozen ground. Any large-scale deep-thawing of these 
soils has the potential to further amplify the greenhouse effect," says co-author Philippe Ciais, 
Associate Director, Laboratory of Climate and Environmental Science, Paris, France.

"The way of life of many organisms on Earth is tightly linked to seasonal changes in 
temperature and availability of food, and all food on land comes first from plants," says Dr. 
Scott Goetz, Deputy Director and Senior Scientist, Woods Hole Research Center, Falmouth, 
USA. "Think of migration of birds to the Arctic in the summer and hibernation of bears in the 
winter: Any significant alterations to temperature and vegetation seasonality are likely to impact 
life not only in the north but elsewhere in ways that we do not yet know."

CREDIT:Sciencedaily.

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