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Climate Dynamics

, Volume 51, Issue 5–6, pp 1793–1818 | Cite as

Seasonal and latitudinal variations of surface fluxes at two Arctic terrestrial sites

  • Andrey A. GrachevEmail author
  • P. Ola G. Persson
  • Taneil Uttal
  • Elena A. Akish
  • Christopher J. Cox
  • Sara M. Morris
  • Christopher W. Fairall
  • Robert S. Stone
  • Glen Lesins
  • Alexander P. Makshtas
  • Irina A. Repina
Article

Abstract

This observational study compares seasonal variations of surface fluxes (turbulent, radiative, and soil heat) and other ancillary atmospheric/surface/permafrost data based on in-situ measurements made at terrestrial research observatories located near the coast of the Arctic Ocean. Hourly-averaged multiyear data sets collected at Eureka (Nunavut, Canada) and Tiksi (East Siberia, Russia) are analyzed in more detail to elucidate similarities and differences in the seasonal cycles at these two Arctic stations, which are situated at significantly different latitudes (80.0°N and 71.6°N, respectively). While significant gross similarities exist in the annual cycles of various meteorological parameters and fluxes, the differences in latitude, local topography, cloud cover, snowfall, and soil characteristics produce noticeable differences in fluxes and in the structures of the atmospheric boundary layer and upper soil temperature profiles. An important factor is that even though higher latitude sites (in this case Eureka) generally receive less annual incoming solar radiation but more total daily incoming solar radiation throughout the summer months than lower latitude sites (in this case Tiksi). This leads to a counter-intuitive state where the average active layer (or thaw line) is deeper and the topsoil temperature in midsummer are higher in Eureka which is located almost 10° north of Tiksi. The study further highlights the differences in the seasonal and latitudinal variations of the incoming shortwave and net radiation as well as the moderating cloudiness effects that lead to temporal and spatial differences in the structure of the atmospheric boundary layer and the uppermost ground layer. Specifically the warm season (Arctic summer) is shorter and mid-summer amplitude of the surface fluxes near solar noon is generally less in Eureka than in Tiksi. During the dark Polar night and cold seasons (Arctic winter) when the ground is covered with snow and air temperatures are sufficiently below freezing, the near-surface environment is generally stably stratified and the hourly averaged turbulent fluxes are quite small and irregular with on average small downward sensible heat fluxes and upward latent heat and carbon dioxide fluxes. The magnitude of the turbulent fluxes increases rapidly when surface snow disappears and the air temperatures rise above freezing during spring melt and eventually reaches a summer maximum. Throughout the summer months strong upward sensible and latent heat fluxes and downward carbon dioxide (uptake by the surface) are typically observed indicating persistent unstable (convective) stratification. Due to the combined effects of day length and solar zenith angle, the convective boundary layer forms in the High Arctic (e.g., in Eureka) and can reach long-lived quasi-stationary states in summer. During late summer and early autumn all turbulent fluxes rapidly decrease in magnitude when the air temperature decreases and falls below freezing. Unlike Eureka, a pronounced zero-curtain effect consisting of a sustained surface temperature hiatus at the freezing point is observed in Tiksi during fall due to wetter and/or water saturated soils.

Keywords

Arctic Carbon dioxide Latitudinal variations Radiative fluxes Turbulent fluxes 

Notes

Acknowledgements

The US National Science Foundation’s Office of Polar Programs supported AAG, POGP, and RSS with award ARC 11-07428. AAG, APM, and IAR were supported by the US Civilian Research and Development Foundation (CRDF) with award RUG1-2976-ST-10. APM was also supported by the Russian Foundation for Basic Research with award RFBR 14-05-00677, the Ministry of Education and Science of the Russian Federation (Projects 2017-14-588-0005-003 and RFMEFI61617X0076), and the Roshydromet (Project CNTP 1.5.3.2). EAA, TU, CJC, and SMM received support from the National Oceanic and Atmospheric Administration (NOAA) Climate Program Office’s Arctic Research Program. We thank all the researchers who deploy, operate, and maintain the instruments at the stations in frequently harsh Arctic conditions; their diligent and dedicated efforts are often underappreciated.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Andrey A. Grachev
    • 1
    • 2
    Email author return OK on get
  • P. Ola G. Persson
    • 1
    • 2
  • Taneil Uttal
    • 1
  • Elena A. Akish
    • 1
    • 3
  • Christopher J. Cox
    • 1
    • 2
  • Sara M. Morris
    • 1
    • 2
  • Christopher W. Fairall
    • 1
  • Robert S. Stone
    • 1
    • 3
  • Glen Lesins
    • 4
  • Alexander P. Makshtas
    • 5
  • Irina A. Repina
    • 6
  1. 1.NOAA Earth System Research LaboratoryBoulderUSA
  2. 2.Cooperative Institute for Research in Environmental SciencesUniversity of ColoradoBoulderUSA
  3. 3.Science and Technology CorporationBoulderUSA
  4. 4.Department of Physics and Atmospheric ScienceDalhousie UniversityHalifaxCanada
  5. 5.Arctic and Antarctic Research InstituteSt. PetersburgRussia
  6. 6.A.M. Obukhov Institute of Atmospheric PhysicsRussian Academy SciencesMoscowRussia

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