# Presentation: 271260

## Observations of an Inward Breaking Filament During PAVE

**M. Schoeberl, T. McGee, A. Douglass, R. Kawa, E. Browell, L. Twigg, J. Waters & the MLS Team**
**One NASA**

- Photo by Mark Kroon

## Observations Jan 31, 2005

**Observations Jan 31, 2005**

**440K**

**500K**

**AROTAL sees high ozone intrusions at 440 and ~500K**

## Vortex Filaments and Intrusions

**Most filaments are generated as the vortex erodes and thus are formed by “outward breaking” events**
**However with strong localized ridging can produce “inward breaking” events can generate a vortex  intrusion.**
**Plumb et al. [1994]**

**January 24, 1992**

**Outward breaking**

**Inward breaking**

**An inward breaking filament was observed on the DC8 Flight of Jan 31, 2005**

**Ridging**

## Satellite and DC-8 Tracks

**Satellite and DC-8 Tracks**

**DC-8**

**Aura MLS**

- PV at 440K

## Meteorological Source of Intrusion

**Meteorological Source of Intrusion**

**Blocking event distorts vortex**

**Vortex symmetrizes folding extra-vortex air**

**Intrusion rotates around inside vortex **

**DC-8**

**PV at 440K**

- Black lines are Montgomery Streamfunction

## Variation of Blocking Ridge

**Variation of Blocking Ridge**

- 1/28/05

- 1/29/05

- 1/30/05

- 1/31/05

**H**

**H**

**H**

**H**

**H**

**H**

**H**

**H**

**H**

**H**

**H**

**L**

**L**

**L**

**L**

**L**

**L**

**L**

**L**

**L**

**Geopotential height perturbation at 65o N**

## AROTAL and MLS (O3)

**AROTAL and MLS (O****3****)**

**AROTAL**

**MLS**

**Model**

**6 day MLS RDF**

**MLS Ozone compares well with AROTAL**

## RDF Simulations (O3)

**RDF Simulations (O****3****)**

**440K**

**Analysis**

**2 day**

**4 day**

**6 day**

**O****3**** RDF’s can be created using MLS maps of ozone from the previous days**

**DIAL PSCs**

## Model and MLS (O3)

**Model and MLS (O****3****)**

**MLS**

**GSFC CTM using assimilated winds**

**Model ozone captures a hint of the filament.**

## AROTAL and MLS RDF

**AROTAL and MLS RDF**

**MLS RDF (using data from Jan 25, 2005) reproduces the structure showing that filament has dynamical origin**

**AROTAL**

**MLS**

**MLS 6 day RDF**

## AROTAL and RDFs

**AROTAL and RDFs**

**Filament at 20 km is not well reproduced**

**6 day RDF**

## AROTAL and MLS RDF

**AROTAL and MLS RDF**

**Filament is reproduced at 23 km**

## PSC’s

**PSC’s**

**NAT   from DIAL  ~20 km (440K)**

## HNO3

**HNO****3**

**PSC Layer does not match expected location**

**DIAL PSC**

**< NAT T using MLS HNO****3**** and H****2****O**

## HNO3

**HNO****3**

**PSC Layer matches expected location**

**DIAL PSC**

**< NAT T using MLS HNO****3**** and H****2****O**

## HNO3 RDF

**HNO****3**** RDF**

**The edge of the NAT cloud corresponds to the filament edge.**

**05/01/31**

**6 Day RDF**

**NAT Cloud observed by DIAL**

**NAT Temperature**

**RDF Parcels that have been at or below NAT temperatures**

## HCl RDF along MLS Track

**HCl RDF along MLS Track**

**HCL shows no evidence of the filament suggesting that the filament air was processed.**
**Also note edge processing.**

**Ozone filament**

**2 day O****3**** RDF**

## Summary

**AROTAL and MLS observeed a vortex ozone anomaly on 01/31/05**
**This anomaly is clearly an intrusion whose origin can be traced to a ridging event over Iceland**
**MLS ozone RDF’s improve the agreement with AROTAL demonstrating the dynamical nature of this event**
**The CTM shows a much weaker anomaly **
**PSC’s were also oberved on this flight, the location of the northern edge of the PSC zone appears to coincide with a low HNO3 band.**
**MLS HCl measurements show no anomaly suggesting that the air was processed.**

## RDF Simulations (PV)

**RDF Simulations (PV)**

**440K**

**Analysis**

**2 day**

**4 day**

**6 day**

**The RDFs show that the intrusion penetrates much more deeply than the analysis indicates.  This intrusion is (low PV) and should be associated with high ozone.  The 6 day RDF shows two low PV intrusions**