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Comparative ecosystem - atmosphere exchange of energy and mass in a western Russian and a central Siberian bog. I) Interseasonal and interannual variability of energy and water fluxes

Kurbatova, J; Arneth, Almut LU ; Vygodskaya, N; Milukova, I; Tchebakova, N; Kolle, O; Lloyd, J and Schulze, ED (2002) In Tellus B 54B(5). p.497-513
Abstract
Energy and latent heat fluxes λE were measured over ombrotrophic bogs in European Russia (Fyodorovskoye) and in central Siberia (Zotino) using the eddy covariance technique, as part of the EuroSiberian Carbonflux Project. The study covered most of the snowfree periods in 1998, 1999 and 2000; in addition some data were also collected under snow in early spring and late autumn 1999 and 2000. The snowfree period in Europian Russia exceeds the snowfree period in central Siberia by nearly 10 weeks. Marked seasonal and interannual differences in temperatures and precipitation, and hence energy partitioning, were observed at both sites. At both bogs latent heat fluxes (λE) exceeded sensible heat fluxes (H) during most of the snowfree period:... (More)
Energy and latent heat fluxes λE were measured over ombrotrophic bogs in European Russia (Fyodorovskoye) and in central Siberia (Zotino) using the eddy covariance technique, as part of the EuroSiberian Carbonflux Project. The study covered most of the snowfree periods in 1998, 1999 and 2000; in addition some data were also collected under snow in early spring and late autumn 1999 and 2000. The snowfree period in Europian Russia exceeds the snowfree period in central Siberia by nearly 10 weeks. Marked seasonal and interannual differences in temperatures and precipitation, and hence energy partitioning, were observed at both sites. At both bogs latent heat fluxes (λE) exceeded sensible heat fluxes (H) during most of the snowfree period: maximum λE were between 10 and 12 MJ m-2 d-1 while maximum H were between 3 and 5 MJ m-2 d-1. There was a tendency towards higher Bowen ratios at Fyodorovskoye. Net radiation was the most influential variable that regulated daily evaporation rates, with no obvious effects due to surface dryness during years with exceptionally dry summers. Total snowfree evaporation at Fyodorovskoye (320 mm) exceeded totals at Zotino (280 mm) by 15%. At the former site, evaporation was equal to or less than precipitation, contrasting the Zotino observations, where summer evaporation was distinctly higher than precipitation. During the entire observation period evaporation rates were less than 50% of their potential rate. These data suggest a strong 'mulching' effect of a rapidly drying peat surface on total evaporation, despite the substantial area of free water surfaces during parts of the year. This effect of surface dryness was also observed as close atmospheric coupling. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Tellus B
volume
54B
issue
5
pages
497 - 513
publisher
Wiley-Blackwell
external identifiers
  • Scopus:0036869459
DOI
10.1034/j.1600-0889.2002.01354.x
language
English
LU publication?
no
id
3f0cbabb-3e31-4b64-b1a4-8bb2b61b7998 (old id 590250)
date added to LUP
2007-11-23 11:41:19
date last changed
2016-10-13 04:45:24
@misc{3f0cbabb-3e31-4b64-b1a4-8bb2b61b7998,
  abstract     = {Energy and latent heat fluxes λE were measured over ombrotrophic bogs in European Russia (Fyodorovskoye) and in central Siberia (Zotino) using the eddy covariance technique, as part of the EuroSiberian Carbonflux Project. The study covered most of the snowfree periods in 1998, 1999 and 2000; in addition some data were also collected under snow in early spring and late autumn 1999 and 2000. The snowfree period in Europian Russia exceeds the snowfree period in central Siberia by nearly 10 weeks. Marked seasonal and interannual differences in temperatures and precipitation, and hence energy partitioning, were observed at both sites. At both bogs latent heat fluxes (λE) exceeded sensible heat fluxes (H) during most of the snowfree period: maximum λE were between 10 and 12 MJ m-2 d-1 while maximum H were between 3 and 5 MJ m-2 d-1. There was a tendency towards higher Bowen ratios at Fyodorovskoye. Net radiation was the most influential variable that regulated daily evaporation rates, with no obvious effects due to surface dryness during years with exceptionally dry summers. Total snowfree evaporation at Fyodorovskoye (320 mm) exceeded totals at Zotino (280 mm) by 15%. At the former site, evaporation was equal to or less than precipitation, contrasting the Zotino observations, where summer evaporation was distinctly higher than precipitation. During the entire observation period evaporation rates were less than 50% of their potential rate. These data suggest a strong 'mulching' effect of a rapidly drying peat surface on total evaporation, despite the substantial area of free water surfaces during parts of the year. This effect of surface dryness was also observed as close atmospheric coupling.},
  author       = {Kurbatova, J and Arneth, Almut and Vygodskaya, N and Milukova, I and Tchebakova, N and Kolle, O and Lloyd, J and Schulze, ED},
  language     = {eng},
  number       = {5},
  pages        = {497--513},
  publisher    = {ARRAY(0xb34e048)},
  series       = {Tellus B},
  title        = {Comparative ecosystem - atmosphere exchange of energy and mass in a western Russian and a central Siberian bog. I) Interseasonal and interannual variability of energy and water fluxes},
  url          = {http://dx.doi.org/10.1034/j.1600-0889.2002.01354.x},
  volume       = {54B},
  year         = {2002},
}