Content - Fine-scale Processes

FISAPS - Fine Scale Atmospheric Processes and Structures

Activity leaders

The initial co-chairs of FISAPS are:

Marvin Geller
Stonybrook University, USA

Hye-Yeong Chun
Yonsei University, Korea

Peter Love
University of Tasmania, Australia 


Members (more to be added):

Jianchun Bian, Institute for Atmospheric Physics, China
Thomas Birner, University of Colorado, USA
David Fritts, GATS, Inc, USA
Michael Gerding, Institute for Atmospheric Physics, Germany
Bruce Ingleby (liaison), ECMWF. UK
Franz-Josef Lübken, Institute for Atmospheric Physics, Germany
Yoshihiro Tomikawa, National Institute of Polar Research, Japan
Toshitaka Tsuda, Kyoto University, Japan
Junhong Wang, NCAR, USA
Ling Wang, GATS, Inc., USA

Activity description

Many atmospheric processes that are important for large-scale dynamics and chemical constituent distributions occur on vertical scales less than 1 km. These include energy and momentum dissipation, momentum fluxes by waves, constituent mixing by turbulence, etc. High vertical-resolution radiosonde data (HVRRD) can be used to obtain information on many of the dynamical processes, but such data are only readily available from a few countries.

Fine-scale atmospheric modelling now has unprecedented capabilities for modelling wave transitions to turbulence. FISAPS will bring together modelling and observational communities to improve our understanding of atmospheric fine-scale processes. It will also seek to widen the availability of HVRRD, and advocate and advise for the archiving of these and other high resolution data (GPS, research balloons and aircraft data).

The objective of this activity is to realise the full potential of large volumes of HVRRD archived worldwide, as well as other high-resolution data. Providing coordination for the growing community of HVRRD users will promote the development of innovative applications of HVRRD by facilitating the sharing of expertise on analysis techniques, data handling, and technical capabilities and limitations. This sharing of expertise will be of similar benefit for the refinement and improvement of existing fields of research using HVRRD as well as the use of other high-resolution data. Due to restrictions on access to HVRRD, previous studies have been limited to relatively small geographic coverage. This activity aims to address this limitation by two means, first, by coordinating broader regional intercomparisons and global studies that bring together researchers from the global HVRRD community. The second is to provide improved access to existing HVRRD to the research community.

While the initial focus of FISAPS will be on fine-scale dynamical structures, it is anticipated that FISAPS may expand its scope to fine-scale constituent structures and processes.  It is clear that troposphere and stratosphere observations of atmospheric constituents show considerable fine-structure, yet chemistry-transport models display relatively smooth structures.  Quantifying how the absence of fine-scale structures in modelled chemical constituents affects computed chemical reaction rates would be a focus of this expanded activity.

Scientific goals include: (1) What information can be obtained on gravity wave source formulations (e. g., jet emission)? (2) To what extent can we broaden the availability of high vertical-resolution radiosonde data? (3) What is the distribution of unstable layers and atmospheric turbulence? (4) Can we better understand fine-scale signatures in atmospheric chemical constituents, and the implications of these fine structures for atmospheric chemistry?  In addition to its basic research goals, FISAPS should also contribute to important applications such as a better understanding of processes that contribute to turbulence effects on aviation and the prediction of clear-air-turbulence for aviation.

Published results

Journal publications:

BAMS Review paper (to be submitted)

SPARC activity updates:

SPARC Newsletter No. 47, 2016, p. 8: FISAPS: An Emerging SPARC Activity, by M. Geller, H.-Y. Chun, and P. Love.