Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets
In this study, the wintertime cyclone/anticyclone activity and its variability over China are examined based on the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data from 1948 to 2007. The climatology of the source, path and lysis regi...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Taylor & Francis Group
2014-01-01
|
Series: | Tellus: Series A, Dynamic Meteorology and Oceanography |
Subjects: | |
Online Access: | http://www.tellusa.net/index.php/tellusa/article/download/21889/pdf_1 |
id |
doaj-6021092dc30647999cecc275f0e7f972 |
---|---|
record_format |
Article |
spelling |
doaj-6021092dc30647999cecc275f0e7f9722020-11-25T01:11:33ZengTaylor & Francis GroupTellus: Series A, Dynamic Meteorology and Oceanography0280-64951600-08702014-01-0166011710.3402/tellusa.v66.2188921889Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jetsLei Chen0Benkui Tan1Nils Gunnar Kvamstø2Ola M. Johannessen3 Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, People's Republic of China Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, People's Republic of China Geophysical Institute, University of Bergen, Bergen, Norway Nansen Environmental and Remote Sensing Center, Bergen, NorwayIn this study, the wintertime cyclone/anticyclone activity and its variability over China are examined based on the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data from 1948 to 2007. The climatology of the source, path and lysis regions for cyclones/anticyclones is investigated using an automatic tracking algorithm. Apparent asymmetries in source, lysis and path regions are observed between cyclones and anticyclones.The 1948–2007 data exhibit an upward trend in the annual number and a downward trend in the cyclone and anticyclone intensity. The leading empirical orthogonal function (EOF) mode of the cyclone transit counts (CTC) for the 1948–2007 period indicates an increase in cyclone activity over northeastern East Asia since the late 1970s that becomes significant in the mid-1980s. The first EOF mode of the anticyclone transit counts (ATC) is a monopole over northern East Asia, centred west of Lake Baikal, which has increased since 1970. The CTC variability dominates the ATC variability, which corresponds well with the storm track variability.Two distinct variability modes in the upper tropospheric jets over East Asia are also observed. The first mode describes an oscillation in the subtropical jet position; the second mode describes the polar-front jet strength variation. Moreover, the second mode is closely linked to the cyclone/anticyclone activity variability.www.tellusa.net/index.php/tellusa/article/download/21889/pdf_1storm trackscyclones/anticyclonesEast Asia climate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lei Chen Benkui Tan Nils Gunnar Kvamstø Ola M. Johannessen |
spellingShingle |
Lei Chen Benkui Tan Nils Gunnar Kvamstø Ola M. Johannessen Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets Tellus: Series A, Dynamic Meteorology and Oceanography storm tracks cyclones/anticyclones East Asia climate |
author_facet |
Lei Chen Benkui Tan Nils Gunnar Kvamstø Ola M. Johannessen |
author_sort |
Lei Chen |
title |
Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets |
title_short |
Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets |
title_full |
Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets |
title_fullStr |
Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets |
title_full_unstemmed |
Wintertime cyclone/anticyclone activity over China and its relation to upper tropospheric jets |
title_sort |
wintertime cyclone/anticyclone activity over china and its relation to upper tropospheric jets |
publisher |
Taylor & Francis Group |
series |
Tellus: Series A, Dynamic Meteorology and Oceanography |
issn |
0280-6495 1600-0870 |
publishDate |
2014-01-01 |
description |
In this study, the wintertime cyclone/anticyclone activity and its variability over China are examined based on the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data from 1948 to 2007. The climatology of the source, path and lysis regions for cyclones/anticyclones is investigated using an automatic tracking algorithm. Apparent asymmetries in source, lysis and path regions are observed between cyclones and anticyclones.The 1948–2007 data exhibit an upward trend in the annual number and a downward trend in the cyclone and anticyclone intensity. The leading empirical orthogonal function (EOF) mode of the cyclone transit counts (CTC) for the 1948–2007 period indicates an increase in cyclone activity over northeastern East Asia since the late 1970s that becomes significant in the mid-1980s. The first EOF mode of the anticyclone transit counts (ATC) is a monopole over northern East Asia, centred west of Lake Baikal, which has increased since 1970. The CTC variability dominates the ATC variability, which corresponds well with the storm track variability.Two distinct variability modes in the upper tropospheric jets over East Asia are also observed. The first mode describes an oscillation in the subtropical jet position; the second mode describes the polar-front jet strength variation. Moreover, the second mode is closely linked to the cyclone/anticyclone activity variability. |
topic |
storm tracks cyclones/anticyclones East Asia climate |
url |
http://www.tellusa.net/index.php/tellusa/article/download/21889/pdf_1 |
work_keys_str_mv |
AT leichen wintertimecycloneanticycloneactivityoverchinaanditsrelationtouppertroposphericjets AT benkuitan wintertimecycloneanticycloneactivityoverchinaanditsrelationtouppertroposphericjets AT nilsgunnarkvamstø wintertimecycloneanticycloneactivityoverchinaanditsrelationtouppertroposphericjets AT olamjohannessen wintertimecycloneanticycloneactivityoverchinaanditsrelationtouppertroposphericjets |
_version_ |
1725170996822933504 |