GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2015-2019  (3)
  • 2017  (3)
Document type
Publisher
Years
  • 2015-2019  (3)
Year
  • 1
    facet.materialart.
    Unknown
    Can preferred atmospheric circulation patterns over the North-Atlantic-Eurasian region be associated with arctic sea ice loss? (2017)
    Elsevier
    In:  EPIC3Polar Scienece, Elsevier, 14, pp. 9-20
    Details
    Publication Date: 2019-01-31
    Description: n the framework of atmospheric circulation regimes, we study whether the recent Arctic sea ice loss and Arctic Amplification are associated with changes in the frequency of occurrence of preferred atmospheric circulation patterns during the extended winter season from December to March. To determine regimes we applied a cluster analysis to sea-level pressure fields from reanalysis data and output from an atmospheric general circulation model. The specific set up of the two analyzed model simulations for low and high ice conditions allows for attributing differences between the simulations to the prescribed sea ice changes only. The reanalysis data revealed two circulation patterns that occur more frequently for low Arctic sea ice conditions: a Scandinavian blocking in December and January and a negative North Atlantic Oscillation pattern in February and March. An analysis of related patterns of synoptic-scale activity and 2 m temperatures provides a synoptic interpretation of the corresponding large-scale regimes. The regimes that occur more frequently for low sea ice conditions are resembled reasonably well by the model simulations. Based on those results we conclude that the detected changes in the frequency of occurrence of large-scale circulation patterns can be associated with changes in Arctic sea ice conditions.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    The linkage between Arctic sea ice changes and mid-latitude atmospheric circulation in reanalysis data and model simulations— The role of barotropic-baroclinic interactions (2017)
    In:  EPIC3US CLIVAR Workshop: Arctic Change and Its Influence on Mid-Latitude Climate and Weather, Washington, DC, 2017-02-01-2017-02-03
    Details
    Publication Date: 2017-02-13
    Description: bserved global warming trends have their maximum in Arctic regions, a phenomenon referred to as Arctic Amplification. Consequently, Arctic sea ice shows a strong decreasing trend. These changes imprint modifications on atmospheric flow patterns not only in Arctic regions themselves. Changes of teleconnections and planetary scale motions like Rossby wave trains affect mid-latitude climate as well. In extension to the studies by Jaiser et al. (abstract submitted) here we study the impact of sea-ice changes on changes in atmospheric synoptic and planetary waves. Therefore, we analyse the atmospheric kinetic energy spectra for ERA-Interim reanalysis and the properly designed Atmospheric General Circulation Model (AGCM) experiments with prescribed sea-ice changes (cf. abstract by Jaiser et al.). Special emphasis has been put on the the role of barotropic-baroclinic interactions and corresponding changes in the tropospheric planetary wave trains by examining the nonlinear kinetic energy and enstrophy interaction and subsequent redistribution of kinetic energy and enstrophy.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Linkages between Arctic sea-ice changes and atmospheric circulation patterns in reanalysis data and model simulations (2017)
    In:  EPIC3The International Workshop Polar Climate Change, Nanjing, China, 2017-10-23-2017-10-24
    Details
    Publication Date: 2017-11-20
    Description: Observed global warming trends have their maximum in Arctic regions, a phenomenon referred to as Arctic Amplification. Consequently, Arctic sea ice shows a strong decreasing trend. These changes imprint modifications on atmospheric flow patterns not only in Arctic regions themselves. Changes of teleconnections and planetary scale motions like Rossby waves affect mid-latitude climate as well. The application of a cluster analysis revealed two circulation patterns that occur more frequently for low Arctic sea ice conditions: a Scandinavian blocking in December and January and a negative North Atlantic Oscillation pattern in February and March. The first pattern is related to enhanced upward wave propagation in this region and period. These waves reach the stratosphere and disturb the polar vortex. The downward response is again linked to the higher frequency of negative NAO events in late winter. These results are consistent in reanalysis data and model simulations.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...