Variations in the vertical profile of ozone at four high-latitude Arctic sites from 2005 to 2017
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Published:2019-08-02
Issue:15
Volume:19
Page:9733-9751
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Bahramvash Shams Shima, Walden Von P., Petropavlovskikh IrinaORCID, Tarasick David, Kivi RigelORCID, Oltmans SamuelORCID, Johnson Bryan, Cullis Patrick, Sterling Chance W., Thölix Laura, Errera Quentin
Abstract
Abstract. Understanding variations in atmospheric ozone in the
Arctic is difficult because there are only a few long-term records of
vertical ozone profiles in this region. We present 12 years of ozone
profiles from February 2005 to February 2017 at four sites: Summit Station,
Greenland; Ny-Ålesund, Svalbard, Norway; and Alert and Eureka, Nunavut, Canada.
These profiles are created by combining ozonesonde measurements with ozone
profile retrievals using data from the Microwave Limb Sounder (MLS). This
combination creates a high-quality dataset with low uncertainty values by relying
on in situ measurements of the maximum altitude of the ozonesondes
(∼30 km) and satellite retrievals in the upper atmosphere (up
to 60 km). For each station, the total column ozone (TCO) and the partial
column ozone (PCO) in four atmospheric layers (troposphere to upper
stratosphere) are analyzed. Overall, the seasonal cycles are similar at
these sites. However, the TCO over Ny-Ålesund starts to decline 2
months later than at the other sites. In summer, the PCO in the upper
stratosphere over Summit Station is slightly higher than at the other sites
and exhibits a higher standard deviation. The decrease in PCO in the middle
and upper stratosphere during fall is also lower over Summit Station. The
maximum value of the lower- and middle-stratospheric PCO is reached earlier
in the year over Eureka. Trend analysis over the 12-year period shows
significant trends in most of the layers over Summit and Ny-Ålesund
during summer and fall. To understand deseasonalized ozone variations, we
identify the most important dynamical drivers of Arctic ozone at each level.
These drivers are chosen based on mutual selected proxies at the four sites
using stepwise multiple regression (SMR) analysis of various dynamical parameters
with deseasonalized data. The final regression model is able to explain more
than 80 % of the TCO and more than 70 % of the PCO in almost all of the
layers. The regression model provides the greatest explanatory value in the
middle stratosphere. The important proxies of the deseasonalized ozone time
series at the four sites are tropopause pressure (TP) and equivalent latitude (EQL) at
370 K in the troposphere, the quasi-biennial oscillation (QBO) in the troposphere
and lower stratosphere, the equivalent latitude at 550 K in the middle and
upper stratosphere, and the eddy heat flux (EHF) and volume of polar stratospheric
clouds throughout the stratosphere.
Funder
Division of Polar Programs
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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