Open AccessA trajectory‐based estimate of the tropospheric ozone column using the residual method
Author(s) -
Schoeberl M. R.,
Ziemke J. R.,
Bojkov B.,
Livesey N.,
Duncan B.,
Strahan S.,
Froidevaux L.,
Kulawik S.,
Bhartia P. K.,
Chandra S.,
Levelt P. F.,
Witte J. C.,
Thompson A. M.,
Cuevas E.,
Redondas A.,
Tarasick D. W.,
Davies J.,
Bodeker G.,
Hansen G.,
Johnson B. J.,
Oltmans S. J.,
Vömel H.,
Allaart M.,
Kelder H.,
Newchurch M.,
GodinBeekmann S.,
Ancellet G.,
Claude H.,
Andersen S. B.,
Kyrö E.,
Parrondos M.,
Yela M.,
Zablocki G.,
Moore D.,
Dier H.,
von der Gathen P.,
Viatte P.,
Stübi R.,
Calpini B.,
Skrivankova P.,
Dorokhov V.,
de Backer H.,
Schmidlin F. J.,
Coetzee G.,
Fujiwara M.,
Thouret V.,
Posny F.,
Morris G.,
Merrill J.,
Leong C. P.,
KoenigLanglo G.,
Joseph E.
Publication year - 2007
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2007jd008773
Subject(s) - troposphere , microwave limb sounder , stratosphere , tropopause , atmospheric sciences , extratropical cyclone , environmental science , climatology , ozone , ozone layer , total ozone mapping spectrometer , tropospheric ozone , ozone monitoring instrument , sciamachy , column (typography) , geology , meteorology , physics , connection (principal bundle) , structural engineering , engineering
We estimate the tropospheric column ozone using a forward trajectory model to increase the horizontal resolution of the Aura Microwave Limb Sounder (MLS) derived stratospheric column ozone. Subtracting the MLS stratospheric column from Ozone Monitoring Instrument total column measurements gives the trajectory enhanced tropospheric ozone residual (TTOR). Because of different tropopause definitions, we validate the basic residual technique by computing the 200‐hPa‐to‐surface column and comparing it to the same product from ozonesondes and Tropospheric Emission Spectrometer measurements. Comparisons show good agreement in the tropics and reasonable agreement at middle latitudes, but there is a persistent low bias in the TTOR that may be due to a slight high bias in MLS stratospheric column. With the improved stratospheric column resolution, we note a strong correlation of extratropical tropospheric ozone column anomalies with probable troposphere‐stratosphere exchange events or folds. The folds can be identified by their colocation with strong horizontal tropopause gradients. TTOR anomalies due to folds may be mistaken for pollution events since folds often occur in the Atlantic and Pacific pollution corridors. We also compare the 200‐hPa‐to‐surface column with Global Modeling Initiative chemical model estimates of the same quantity. While the tropical comparisons are good, we note that chemical model variations in 200‐hPa‐to‐surface column at middle latitudes are much smaller than seen in the TTOR.