Regional Processes & Transports

Wednesday, March 8, 2017 -
09:00 to 10:00


-          Discussion of working group science questions and “state of IASOA” (Uttal) – 20min

-          Presentation and discussion of CLIVAR (Vihma) – 20 min

-          Discussion of YOPP rawinsonde inventory (Uttal) – 10min


IASOA Regional Processes and Transport Working Group

March 8, 2017


Attendees: Sara Crepinsek, Taneil Uttal, Audra McClure, Thomas Haiden, Martin/Manfred Wendisch, Michael Tjernström, Lantao Sun, Timo Vihma, Xiangdong Zhang, Judah Cohen, Sandy Starkweather, Chris Cox, Irina Petropavlovskikh, Jim Overland

Introduction – roll call

Discussion of working group science questions and status (Uttal) – Overview of steering committee – selected for representation of different observatories in IASOA, in the process of rethinking of goals of IASOA, recompose steering committee so that chairs/co-chairs are included in the steering committee, this would lead to steering committee being very science focused, re-focus working groups and collapse clouds working group into the radiation group and create a new sixth working group called observations and data working group, another steering committee meeting will meet in April, how often would steering committee meet? – hopefully meet quarterly, if working group chairs are included in steering committee then that would provide a platform for the groups to integrate and discuss each of the groups foci/action items, important to keep higher order people also involved in the steering committee for guidance, structure of steering committee still in flux


Presentation by Vihma: CLIVAR workshopThe U.S. CLIVAR Arctic – mid-latitude WG Workshop on 1-3 February 2017 – links to IASOA?, Scientific organizing committee, program organizing committee, workshop findings summary: Arctic rapid change – emergence of new forcing (external and internal) for atmospheric circulation, Arctic amplification is prominent and even accelerating, example of presentations given (The bottom-heavy vertical structure is not necessarily caused by surface turbulent heat fluxes), Arctic mid-latitude linkages – focusing on seasonal and regional linkages and addressing sources of inconsistency and uncertainty among studies, workshop participant identified a list of proposed physical processes that may play an important role in linking Arctic change to mid-latitude climate and weather, does weaker and wavier circulation promotes extreme weather, discussion of Barents/Kara Sea-Asian winter teleconnection, Warm Barents/Kara Seas à Cold Asia, Observations: recommendations emerged from the workshop to expand the observational datasets and analyses approaches of Arctic change and mid-latitude linkages: to synthesize new Arctic obs to provide the best high-resolution estimate of the atmospheric state for better understanding sea ice and ocean surface processes, to create physically-based sea ice/ocean surface forcing data sets available to investigate Arctic-mid-latitude linkages, to systematically employ proven and new metrics to identify forced signals of atmospheric circulation from natural variability, to analyze paleoclimate data and new observational datasets that span most of the past century including reanalysis and sea ice, to utilize new observational analysis methods that extend beyond correlative relationships to establish causal links between forcing and response,

Causal Effect Networks (CEN): CEN-algorithm is multivariate approach that tests for conditional dependent relationships among a set of time-series and for different lags, distinguishes between spurious and correlations and causal relationships among a set of time-series and for different lags, distinguishes between spurious correlations and causal relationships, CEN can be applied in hypothesis testing or to evaluate model data

Model experiments: coordinated experiments will enable a more systematic evaluation of mechanisms and pathways linking Arctic and mid-latitude climate and weather as well as associated feedback processes

Observing System Experiments (OSEs)

Links to IASOA: 1) IASOA has unique data sets for evaluation of climate and NWP models, 2) Possibilities for systematic use of IASOA data to study the local and remote factors causing Arctic Amplification, 3) Extreme events in the Arctic as observed at IASOA stations, 4) Additional radiosonde soundings during YOPP intensive observation periods at IASOA stations


Integrated Global Radiosonde Archive – overview of IASOA stations collecting and submitting data to the integrated global radiosonde archive, this is an important resource if wanting to continue to investigate this type of data


Action Items:

  • Identify science questions of the working group, email discussion (ALL)
  • Create google inventory sheet of IASOA stations collecting radiosonde data (Uttal)