| WEI Lixin,QIN Ting. 2016. Characteristics of cyclone climatology and variability in the Southern Ocean. Acta Oceanologica Sinica, 35(7):59－67 |
| Characteristics of cyclone climatology and variability in the Southern Ocean |
| 南大洋气旋气候与变化特征 |
| Received:August 11, 2015 Revised:October 21, 2015 |
| DOI：10.1007/s13131-016-0913-y |
| Key words:Southern Ocean cyclones automated detection and tracking algorithm Southern Annular Mode |
| 中文关键词: 南大洋 气旋 自动追踪算法 南半球环状模 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41206186; the Chinese Polar Environment Comprehensive Investigation and Assessment Programmes under contract No. 2015-04-03. |
|
| Hits: 2128 |
| Download times: 1389 |
| Abstract: |
| A new climatology of cyclones in the Southern Ocean is generated by applying an automated cyclone detection and tracking algorithm (developed by Hodges at the Reading University) for an improved and relatively highresolution European Centre for Medium-Range Weather Forecasts atmospheric reanalysis during 1979-2013. A validation shows that identified cyclone tracks are in good agreement with a available analyzed cyclone product. The climatological characteristics of the Southern Ocean cyclones are then analyzed, including track, number, density, intensity, deepening rate and explosive events. An analysis shows that the number of cyclones in the Southern Ocean has increased for 1979-2013, but only statistically significant in summer. Coincident with the circumpolar trough, a single high-density band of cyclones is observed in 55°-67°S, and cyclone density has generally increased in north of this band for 1979-2013, except summer. The intensity of up to 70% cyclones in the Southern Ocean is less than 980 hPa, and only a few cyclones with pressure less than 920 hPa are detected for 1979-2013. Further analysis shows that a high frequency of explosive cyclones is located in the band of 45°-55°S, and the Atlantic Ocean sector has much higher frequent occurrence of the explosive cyclones than that in the Pacific Ocean sector. Additionally, the relationship between cyclone activities in the Southern Ocean and the Southern Annular Mode is discussed. |
| 中文摘要: |
| 本文基于欧洲中心较高分辨率的海平面气压场再分析数据，采用英国雷丁大学的气旋自动追踪算法，建立了一套1979-2013年南大洋气旋气候数据集。文中通过对比验证了气旋追踪算法的可靠性。基于这套数据，进一步分析了南大洋气旋的气候特征，包括气旋的路径，数量，密度，强度，气旋加深以及爆发性气旋的活动特征。分析表明，1979-2013年，南大洋气旋总数增加，但是仅夏季气旋的增加达到了95%的显著水平。南大洋气旋密度高值区域呈带状分布于55°S-67°S，除夏季外这个密度带以北的气旋密度表现为增加趋势。多达70%的南大洋气旋的最低中心气压值低于980hPa，仅少数气旋的最低中心气压值能低于920hPa。爆发性气旋多发于45°S-55°S，并且南大西洋区域的爆发性气旋的发生率明显高于南太平洋区域。文中还进一步讨论了南大洋气旋的活动与南半球环状模（AAO）之间的关系。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
