Comparative Analysis of Ozone Variation in UTLS due to Different Types and Intensities of Cut-off Lows over East Asia

ZHOU Tianjiao; CHEN Dan; WANG Yongqing; GUO Dong

doi:10.7522/j.issn.1000-0534.2017.00079

Plateau Meteorology >

2018 , Vol. 37 >Issue 3: 837 - 849

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00079

Comparative Analysis of Ozone Variation in UTLS due to Different Types and Intensities of Cut-off Lows over East Asia

ZHOU Tianjiao ,
CHEN Dan ,
WANG Yongqing ,
GUO Dong

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Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;College of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China

Received date: 2017-05-08

Online published: 2018-06-28

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Abstract

The combinative ERA-Interim high resolution ozone reanalysis data and NCEP reanalysis data were used to comparatively analyze the variation of ozone in the UTLS (Upper Troposphere-Lower Stratosphere) caused by stratospheric intrusion during different types ("shallow" type and "deep" type) and different intensities (focus on "deep" type) of cut-off lows over East Asia. The results showed that the stratospheric ozone intrusion occurs in all the "deep" and "shallow" type of cut-off lows. The ozone increment in the "shallow" type of cut-off low is comparable to the "deep" type at 300 hPa. Therefore, in the process of the STE (Stratosphere-Troposphere Exchange) during cut-off lows, the role of "shallow" type of cut-off lows can not be ignored. In the vertical distribution of ozone variation, due to the vertical structure of the cut-off lows, ozone increase mainly covers from upper troposphere to lower stratosphere in the "deep" type cases, while the "shallow" type cases concentrate on upper troposphere. In addition, the distribution patterns of the UTLS ozone imply that the value of ozone content and the range of high ozone content are related to the intensity of the system itself. The range of ozone positive anomalies is larger and the increase of ozone concentration is higher in stronger "deep" type of cut-off lows than that of weaker cases at 300 hPa. In the "deep" type cut-off lows, the descending depth of dynamical tropopause and the ozone concentration of the intrusion in stronger cut-off lows are much larger than those of weaker cut-off lows. Meanwhile, the jet with different types of cut-off lows has the same intensity, while the vertical range of those with the "deep" type of cut-off lows is much larger. The ozone average of 11 years and the ozone average in the month that the systems happened of 11 years were used as standards of ozone anomalies for comparative analysis respectively. The results showed that the comparison results of ozone in different types and intensities of cut-off lows are not affected by using different mean ozone value as the criterion of anomaly.

Key words： Cut-off low; UTLS; ozone; stratosphere-troposp

Cite this article

ZHOU Tianjiao , CHEN Dan , WANG Yongqing , GUO Dong . Comparative Analysis of Ozone Variation in UTLS due to Different Types and Intensities of Cut-off Lows over East Asia[J]. Plateau Meteorology, 2018 , 37(3) : 837 -849 . DOI: 10.7522/j.issn.1000-0534.2017.00079

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