Advanced

Characteristics of summer-time energy exchange in a high Arctic tundra heath 2000-2010

Lund, Magnus LU ; Hansen, Birger U.; Pedersen, Stine H.; Stiegler, Christian LU and Tamstorf, Mikkel P. (2014) In Tellus. Series B: Chemical and Physical Meteorology 66.
Abstract
Global warming will bring about changes in surface energy balance of Arctic ecosystems, which will have implications for ecosystem structure and functioning, as well as for climate system feedback mechanisms. In this study, we present a unique, long-term (2000-2010) record of summer-time energy balance components (net radiation, R-n; sensible heat flux, H; latent heat flux, LE; and soil heat flux, G) from a high Arctic tundra heath in Zackenberg, Northeast Greenland. This area has been subjected to strong summer-time warming with increasing active layer depths (ALD) during the last decades. We observe high energy partitioning into H, low partitioning into LE and high Bowen ratio (beta = H/LE) compared with other Arctic sites, associated... (More)
Global warming will bring about changes in surface energy balance of Arctic ecosystems, which will have implications for ecosystem structure and functioning, as well as for climate system feedback mechanisms. In this study, we present a unique, long-term (2000-2010) record of summer-time energy balance components (net radiation, R-n; sensible heat flux, H; latent heat flux, LE; and soil heat flux, G) from a high Arctic tundra heath in Zackenberg, Northeast Greenland. This area has been subjected to strong summer-time warming with increasing active layer depths (ALD) during the last decades. We observe high energy partitioning into H, low partitioning into LE and high Bowen ratio (beta = H/LE) compared with other Arctic sites, associated with local climatic conditions dominated by onshore winds, slender vegetation with low transpiration activity and relatively dry soils. Surface saturation vapour pressure deficit (D-s) was found to be an important variable controlling within-year surface energy partitioning. Throughout the study period, we observe increasing H/R-n and LE/R-n and decreasing G/R-n and beta, related to increasing ALD and decreasing soil wetness. Thus, changes in summer-time surface energy balance partitioning in Arctic ecosystems may be of importance for the climate system. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
energy budget, energy balance, Arctic, sensible heat, latent heat, ground heat, net radiation, climate change, global warming
in
Tellus. Series B: Chemical and Physical Meteorology
volume
66
publisher
Taylor & Francis
external identifiers
  • wos:000339667300001
  • scopus:84922352748
ISSN
0280-6509
DOI
10.3402/tellusb.v66.21631
language
English
LU publication?
yes
id
0cadbc0e-2b72-4726-95a0-df6f84425f45 (old id 4591737)
date added to LUP
2014-09-08 08:55:24
date last changed
2017-03-26 03:47:26
@article{0cadbc0e-2b72-4726-95a0-df6f84425f45,
  abstract     = {Global warming will bring about changes in surface energy balance of Arctic ecosystems, which will have implications for ecosystem structure and functioning, as well as for climate system feedback mechanisms. In this study, we present a unique, long-term (2000-2010) record of summer-time energy balance components (net radiation, R-n; sensible heat flux, H; latent heat flux, LE; and soil heat flux, G) from a high Arctic tundra heath in Zackenberg, Northeast Greenland. This area has been subjected to strong summer-time warming with increasing active layer depths (ALD) during the last decades. We observe high energy partitioning into H, low partitioning into LE and high Bowen ratio (beta = H/LE) compared with other Arctic sites, associated with local climatic conditions dominated by onshore winds, slender vegetation with low transpiration activity and relatively dry soils. Surface saturation vapour pressure deficit (D-s) was found to be an important variable controlling within-year surface energy partitioning. Throughout the study period, we observe increasing H/R-n and LE/R-n and decreasing G/R-n and beta, related to increasing ALD and decreasing soil wetness. Thus, changes in summer-time surface energy balance partitioning in Arctic ecosystems may be of importance for the climate system.},
  articleno    = {21631},
  author       = {Lund, Magnus and Hansen, Birger U. and Pedersen, Stine H. and Stiegler, Christian and Tamstorf, Mikkel P.},
  issn         = {0280-6509},
  keyword      = {energy budget,energy balance,Arctic,sensible heat,latent heat,ground heat,net radiation,climate change,global warming},
  language     = {eng},
  publisher    = {Taylor & Francis},
  series       = {Tellus. Series B: Chemical and Physical Meteorology},
  title        = {Characteristics of summer-time energy exchange in a high Arctic tundra heath 2000-2010},
  url          = {http://dx.doi.org/10.3402/tellusb.v66.21631},
  volume       = {66},
  year         = {2014},
}