Regional Processes & Transports

Wednesday, February 7, 2018 -
09:00 to 10:00



- Introductions (10 min)


- Catch up on YOPP discussions for anyone not calling into preceding meeting (Uttal -10 min) including discussion of the concept of the IASOA Amalgamated Observatory Data Files


- Discussion of the overlapping YOPP and IASOA science directions (All - 20 min)


- Presentation: Preliminary look at the 2015-2016 temperatures compared to historical values for Barrow and Tiksi (Uttal - 5 min) 


 - Discussion of next steps on ITEM 1) Strong Arctic - Mid-latitude interaction events (All - 15 min)


IASOA Transports 2-7-2018


Facilitator: Taneil


Attendees: Ola Persson, Taneil Uttal, Chris Cox, Jim Overland, Timo Vhima, Matt Shupe, Michael Tjernström, Barbara Casati


Role Call: No individual intros today



YOPP Preparation:

  • Taneil met with YOPP Verification Task Team and discussed observational support activities. The Verification Team is IASOA’s principle YOPP collaborator.
  • Taneil provided an overview of Barbara’s YOPP slides
  • YOPP: Supersites / NWP output  = >  target processes
    • (Ola) Some target processes (i.e., tendencies) may be out of reach for IASOA
    • Taneil: We will need to evaluate which values can be provided for each site
  • The supersites are IASOA + Whitehorse and Iqaluit, which are likely to enter IASOA (contact: Zen Mariani).
  • AODS” Amalgamated Observatory Data Files will be made for each site to archive YOPP supersite values
  • Chris asks about time table
    • No real-time plans, so post-SOP research
  • Taneil’s message from IASOA to YOPP: “We Are Here”
  • Jim would like to focus on some science questions beyond the data archiving efforts…segue…


Jim’s “pitch”:

  • A focus on Arctic-mid latitude 2-directional linkages
    • There is much complexity in the jet stream, which serves as the linkage “bridge”
    • It may be more instructive to focus on event-scale links rather than seasonal
      • Events are rare (couple per decade) so long averages obscure signal
    • Case Studies!
    • Winter 2016 is an example
      • Chukchi/Bering late freeze-up is spatially situated to interact with the jet
    • 2017
      • Warmth in Alaska in autumn and another late freezeup
      • May be linked to east coast USA cold snap at the same time
        • AK warmth -> larger geopotential thickness -> west coast USA ridge -> east coast USA trough
      • Some discussing about chicken and egg
        • Jim frames the local Chukchi/Bering ice anomalies as re-enforcing mechanisms that require the right long wave pattern, but can then serve to promote persistence of that pattern.
    • Taneil: How do we interpret these events through the perspective of the IASOA observations? E.g., Barrow 2016
    • Timo: Mostly model and reanalysis perspectives thus far so observational perspectives needed. Two parts:
      • YOPP Verification
        • Ola adds + reanalysis verification
        • Barbara adds + observational uncertainty analyses
      • Case Studies, such as Jim describes
    • Taneil: Lets identify a case study to focus on
      • Ola wishes to define case study
      • Jim indicates multi-week to monthly
        • Seasonal too long, synoptic too short
        • Begin with the long wave pattern and focus on events within that pattern


Action Items: