4.6 Article

Signatures of Anomalous Transport in the 2019/2020 Arctic Stratospheric Polar Vortex

Journal

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 127, Issue 20, Pages -

Publisher

AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JD037407

Keywords

stratospheric polar vortex; stratospheric transport; satellite composition data; long-lived trace gases

Funding

  1. Jet Propulsion Laboratory (JPL) Microwave Limb Sounder team under JPL [1521127]
  2. NASA's Global Modeling and Assimilation
  3. NASA's Modeling, Analysis and Prediction (MAP)
  4. National Aeronautics and Space Administration [80NM0018D0004]

Ask authors/readers for more resources

The exceptionally strong and long-lived Arctic stratospheric polar vortex in 2019/2020 resulted in large transport anomalies throughout the fall-winter-spring period. These anomalies were most prominent in the lower to middle stratosphere and were reflected in the concentrations of N2O and CH4. During the midwinter to spring period, the anomalies primarily arose from inhibited mixing between the vortex and non-vortex air.
The exceptionally strong and long-lived Arctic stratospheric polar vortex in 2019/2020 resulted in large transport anomalies throughout the fall-winter-spring period from vortex development to breakup. These anomalies are studied using Aura MLS N2O, H2O, and CO long-lived trace gas data, ACE-FTS CH4 data, and meteorological and trace gas fields from reanalyses. Anomalies are strongest throughout the winter in the lower through the middle stratosphere (from about 500K through 700K), with record low (high) departures from climatology in N2O and CH4 (H2O). CO shows extreme high anomalies in midwinter through spring down to about 550K. Descent rates, vortex confinement, and trace gas distributions in the preceding months indicate that early winter anomalies in N2O and H2O arose primarily from entrainment of air with already-anomalous values into the vortex as it developed in fall 2019 followed by descent of those anomalies to lower levels within the vortex. Trace gas anomalies in midwinter through the late vortex breakup in spring 2020 arose primarily from inhibition of mixing between vortex and extravortex air because of the exceptionally strong and persistent vortex. Persistent strong N2O and H2O gradients across the vortex edge demonstrate that air within the vortex and its remnants remained very strongly confined through late April (mid-May) in the middle (lower) stratosphere. These results are important for understanding the evolution of trace gas distributions, which affects both polar chemical processing and radiative processes related to climate.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available