The evolution of CLO and NO along air parcel trajectories

M. R. Schoeberl; A. R. Douglass; R. S. Stolarski; P. A. Newman; L. R. Lait; D. Toohey; L. Avallone; J. G. Anderson; W. Brune; D. W. Fahey; K. Kelly

doi:10.1029/93GL01690

The evolution of CLO and NO along air parcel trajectories

M. R. Schoeberl, A. R. Douglass, R. S. Stolarski, P. A. Newman, L. R. Lait, D. Toohey, L. Avallone, J. G. Anderson, W. Brune, D. W. Fahey, K. Kelly

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21 Scopus citations

Abstract

Back trajectory analysis of Arctic and Antarctic aircraft data reveals that high ClO concentrations are associated with predicted polar stratospheric cloud (PSCs) encounters. The ClO concentrations within the Arctic and Antarctic polar vortices vary widely but appear to be inversely related to parcel solar exposure since the last PSC interaction. These results imply that production of NO_x from HNO₃ photolysis and reaction with OH is the mechanism, for the loss of chlorine radicals through the reformation of chlorine nitrate. Highly denitrified air parcels show no change in ClO with solar exposure. The recovery process is quantitatively duplicated using a model of chemistry along trajectories. Although PSC processing is the primary mechanism for producing elevated ClO amounts, back trajectories apparently unperturbed by PSC's also show slightly elevated ClO levels in 1992 compared to Arctic 1989 and Antarctic 1987 measurements presumably due to the presence of Pinatubo aerosol.

Original language	English (US)
Pages (from-to)	2511-2514
Number of pages	4
Journal	Geophysical Research Letters
Volume	20
Issue number	22
DOIs	https://doi.org/10.1029/93GL01690
State	Published - Nov 19 1993

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/93GL01690

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@article{d1e0da49e5c74c8e8a7aedf02cdad8cc,

title = "The evolution of CLO and NO along air parcel trajectories",

abstract = "Back trajectory analysis of Arctic and Antarctic aircraft data reveals that high ClO concentrations are associated with predicted polar stratospheric cloud (PSCs) encounters. The ClO concentrations within the Arctic and Antarctic polar vortices vary widely but appear to be inversely related to parcel solar exposure since the last PSC interaction. These results imply that production of NOx from HNO3 photolysis and reaction with OH is the mechanism, for the loss of chlorine radicals through the reformation of chlorine nitrate. Highly denitrified air parcels show no change in ClO with solar exposure. The recovery process is quantitatively duplicated using a model of chemistry along trajectories. Although PSC processing is the primary mechanism for producing elevated ClO amounts, back trajectories apparently unperturbed by PSC's also show slightly elevated ClO levels in 1992 compared to Arctic 1989 and Antarctic 1987 measurements presumably due to the presence of Pinatubo aerosol.",

author = "Schoeberl, {M. R.} and Douglass, {A. R.} and Stolarski, {R. S.} and Newman, {P. A.} and Lait, {L. R.} and D. Toohey and L. Avallone and Anderson, {J. G.} and W. Brune and Fahey, {D. W.} and K. Kelly",

year = "1993",

month = nov,

day = "19",

doi = "10.1029/93GL01690",

language = "English (US)",

volume = "20",

pages = "2511--2514",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "American Geophysical Union",

number = "22",

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TY - JOUR

T1 - The evolution of CLO and NO along air parcel trajectories

AU - Schoeberl, M. R.

AU - Douglass, A. R.

AU - Stolarski, R. S.

AU - Newman, P. A.

AU - Lait, L. R.

AU - Toohey, D.

AU - Avallone, L.

AU - Anderson, J. G.

AU - Brune, W.

AU - Fahey, D. W.

AU - Kelly, K.

PY - 1993/11/19

Y1 - 1993/11/19

N2 - Back trajectory analysis of Arctic and Antarctic aircraft data reveals that high ClO concentrations are associated with predicted polar stratospheric cloud (PSCs) encounters. The ClO concentrations within the Arctic and Antarctic polar vortices vary widely but appear to be inversely related to parcel solar exposure since the last PSC interaction. These results imply that production of NOx from HNO3 photolysis and reaction with OH is the mechanism, for the loss of chlorine radicals through the reformation of chlorine nitrate. Highly denitrified air parcels show no change in ClO with solar exposure. The recovery process is quantitatively duplicated using a model of chemistry along trajectories. Although PSC processing is the primary mechanism for producing elevated ClO amounts, back trajectories apparently unperturbed by PSC's also show slightly elevated ClO levels in 1992 compared to Arctic 1989 and Antarctic 1987 measurements presumably due to the presence of Pinatubo aerosol.

AB - Back trajectory analysis of Arctic and Antarctic aircraft data reveals that high ClO concentrations are associated with predicted polar stratospheric cloud (PSCs) encounters. The ClO concentrations within the Arctic and Antarctic polar vortices vary widely but appear to be inversely related to parcel solar exposure since the last PSC interaction. These results imply that production of NOx from HNO3 photolysis and reaction with OH is the mechanism, for the loss of chlorine radicals through the reformation of chlorine nitrate. Highly denitrified air parcels show no change in ClO with solar exposure. The recovery process is quantitatively duplicated using a model of chemistry along trajectories. Although PSC processing is the primary mechanism for producing elevated ClO amounts, back trajectories apparently unperturbed by PSC's also show slightly elevated ClO levels in 1992 compared to Arctic 1989 and Antarctic 1987 measurements presumably due to the presence of Pinatubo aerosol.

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

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ER -

The evolution of CLO and NO along air parcel trajectories

Abstract

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