The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation
ABSTRACT The effects of El Niño/Southern Oscillation ( ENSO ) under negative Arctic Oscillation ( AO ) phase on the Asian dust activity are investigated for springs of the period 1961–2002. The spring dust index ( DI ) describing the monthly frequencies of three types of dust events (e.g. dust storm...
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crwiley:10.1002/joc.4028 2024-09-30T14:31:32+00:00 The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation Lee, Yun Gon Kim, Jhoon Ho, Chang‐Hoi An, Soon‐Il Cho, Hi‐Ku Mao, Rui Tian, Baijun Wu, Dong Lee, Jae N. Kalashnikova, Olga Choi, Yunsoo Yeh, Sang‐Wook Korea Meteorological Administration Research and Development Program 2014 http://dx.doi.org/10.1002/joc.4028 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4028 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4028 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 35, issue 6, page 935-947 ISSN 0899-8418 1097-0088 journal-article 2014 crwiley https://doi.org/10.1002/joc.4028 2024-09-17T04:50:19Z ABSTRACT The effects of El Niño/Southern Oscillation ( ENSO ) under negative Arctic Oscillation ( AO ) phase on the Asian dust activity are investigated for springs of the period 1961–2002. The spring dust index ( DI ) describing the monthly frequencies of three types of dust events (e.g. dust storm, blowing dust, and floating dust) exhibits a significant increase in the years of negative AO phase (hereafter AO −) and El Niño, compared with that in the years of AO − and La Niña. Averaged over all observation stations, the spring DI (49.7) during the El Niño/ AO − years is higher by 11.4% or 29.8% than that (38.3) during the La Niña/ AO − years. We suggest possible physical mechanism that the anomalous large‐scale environments associated with AO − and El Niño are more effective to provide favourable conditions to enhance Asian dust activity. During the El Niño/ AO − years, meridional gradients of pressure and temperature over the dust source regions are significantly enhanced by decreasing the geopotential height and warming air temperature that originated from the north and south of source regions, respectively, under the influence of AO − and El Niño. These also intensify the zonal wind shear and atmospheric baroclinicity, thereby producing enhanced cyclogenesis and dust occurrences over the major source regions. At the same time, dust transport paths with the stronger westerly winds are developed by the combined constraints of anomalous cyclone over the Siberia and the Mongolia and anomalous anticyclone over the western North Pacific, and thus strengthen dust transport to the downwind regions. Article in Journal/Newspaper Arctic Siberia Wiley Online Library Arctic Pacific International Journal of Climatology 35 6 935 947 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT The effects of El Niño/Southern Oscillation ( ENSO ) under negative Arctic Oscillation ( AO ) phase on the Asian dust activity are investigated for springs of the period 1961–2002. The spring dust index ( DI ) describing the monthly frequencies of three types of dust events (e.g. dust storm, blowing dust, and floating dust) exhibits a significant increase in the years of negative AO phase (hereafter AO −) and El Niño, compared with that in the years of AO − and La Niña. Averaged over all observation stations, the spring DI (49.7) during the El Niño/ AO − years is higher by 11.4% or 29.8% than that (38.3) during the La Niña/ AO − years. We suggest possible physical mechanism that the anomalous large‐scale environments associated with AO − and El Niño are more effective to provide favourable conditions to enhance Asian dust activity. During the El Niño/ AO − years, meridional gradients of pressure and temperature over the dust source regions are significantly enhanced by decreasing the geopotential height and warming air temperature that originated from the north and south of source regions, respectively, under the influence of AO − and El Niño. These also intensify the zonal wind shear and atmospheric baroclinicity, thereby producing enhanced cyclogenesis and dust occurrences over the major source regions. At the same time, dust transport paths with the stronger westerly winds are developed by the combined constraints of anomalous cyclone over the Siberia and the Mongolia and anomalous anticyclone over the western North Pacific, and thus strengthen dust transport to the downwind regions. |
author2 |
Korea Meteorological Administration Research and Development Program |
format |
Article in Journal/Newspaper |
author |
Lee, Yun Gon Kim, Jhoon Ho, Chang‐Hoi An, Soon‐Il Cho, Hi‐Ku Mao, Rui Tian, Baijun Wu, Dong Lee, Jae N. Kalashnikova, Olga Choi, Yunsoo Yeh, Sang‐Wook |
spellingShingle |
Lee, Yun Gon Kim, Jhoon Ho, Chang‐Hoi An, Soon‐Il Cho, Hi‐Ku Mao, Rui Tian, Baijun Wu, Dong Lee, Jae N. Kalashnikova, Olga Choi, Yunsoo Yeh, Sang‐Wook The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation |
author_facet |
Lee, Yun Gon Kim, Jhoon Ho, Chang‐Hoi An, Soon‐Il Cho, Hi‐Ku Mao, Rui Tian, Baijun Wu, Dong Lee, Jae N. Kalashnikova, Olga Choi, Yunsoo Yeh, Sang‐Wook |
author_sort |
Lee, Yun Gon |
title |
The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation |
title_short |
The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation |
title_full |
The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation |
title_fullStr |
The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation |
title_full_unstemmed |
The effects of ENSO under negative AO phase on spring dust activity over northern China: an observational investigation |
title_sort |
effects of enso under negative ao phase on spring dust activity over northern china: an observational investigation |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1002/joc.4028 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4028 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4028 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Siberia |
genre_facet |
Arctic Siberia |
op_source |
International Journal of Climatology volume 35, issue 6, page 935-947 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.4028 |
container_title |
International Journal of Climatology |
container_volume |
35 |
container_issue |
6 |
container_start_page |
935 |
op_container_end_page |
947 |
_version_ |
1811636027704475648 |