| 热带和热带外海表温度异常与低空环流特征比较 |
| |
| 引用本文： | 吴国雄,王敬方.热带和热带外海表温度异常与低空环流特征比较[J].气象学报,1996,54(4):385-397. |
| |
| 作者姓名： | 吴国雄 王敬方 |
| |
| 作者单位： | 大气科学和地球流体力学数值模拟国家重点实验室（ＬＡＳＧ），中国科学院大气物理研究所 |
| |
| 摘 要： | 利用旋转主分量方法（ＲＰＣ），在对西太平洋和印度洋１９８０年１月至１９８８年９月共１０５个月的月平均海表温度（ＳＳＴ）进行分析的基础上，提取热带模及高纬模两种ＳＳＴ异常（ＳＳＴＡ）分布。再通过分析同期８５０ｈＰａ，各气象要素在该两模上的投影，比较低层大气与不同纬度上ＳＳＴＡ相联系的异常特征。结果表明，无论是热带还是热带外地区，暖性ＳＳＴＡ上空均有正的水汽异常及平均流场对月平均水汽输送的异常辐合。两地区ＳＳＴＡ上空８５０ｈＰａ月平均异常的最重要差异表现在流场、高度场及温度场上。热带正ＳＳＴＡ上方８５０ｈＰａ位势高度及温度均为负距平，流场呈Ｇｉｌｌ型的气旋式异常环流。热带外正ＳＳＴＡ上方８５０ｈＰａ高度及温度均为正距平，流场则呈反气旋式异常环流。分析表明，高纬度的这种异常特征主要是由于中高纬度大气的地转性和斜压性较强所致。
|
| 关 键 词： | 旋转主分量，热带模和高纬模，地转性和斜压性 |
| 收稿时间： | 1994/9/20 0:00:00 |
| 修稿时间： | 1995/4/20 0:00:00 |
COMPARISON OF THE CORRELATIONS OF LOWER TROPOSPHERIC CIRCULATION WITH TROPICAL AND EXTRATROPICAL SEA SURFACE TEMPERATURE ANOMALIES |
| |
| Wu guoxiong and Wang Jingfang.COMPARISON OF THE CORRELATIONS OF LOWER TROPOSPHERIC CIRCULATION WITH TROPICAL AND EXTRATROPICAL SEA SURFACE TEMPERATURE ANOMALIES[J].Acta Meteorologica Sinica,1996,54(4):385-397. |
| |
| Authors: | Wu guoxiong and Wang Jingfang |
| |
| Institution: | LASG Institute of Atmospheric Physics, Academia Sinica, Beijing, 100080;LASG Institute of Atmospheric Physics, Academia Sinica, Beijing, 100080 |
| |
| Abstract: | he method of rotational principle component (RPC) was employed to analyse the sea surface temperature (SST) in the area of the Indian Ocean and western Pacific Ocean in the 105-month period from January 1980 to September 1988.A tropical mode Et of SSt anomaly(SSTA)centered to the east of the Philippines and an extratropical mode Ee of SSTA in the surroundings of the Kamchatka Peninsula were thus obtained.The monthly mean meteorological fields at 850hPa in the same 105-month period were then projected onto the time eigenvectors of these two modes respectively to compare their relations with SSTA at different latitudes.Results show that in both tropical and extratropical regions, warm SSTA is accompanied by positive anomaly of specific humidity at 850hPa.and by abnormal convergence of mean flux of monthly averaged specific humidity. Moreover,the statistically significant correlations of the 850hPa fields were found just above the SSTA region or its neighbourhoods.The main differences between the two sets of projection were found in the 850hPa fields of flow, geopotential height, and temperature.Related to the tropical positive SSTA are lower height,colder temperature anomalies.and accompanied with the Gill type cyclonic abnormal circulation. On the contrary,over the extratropical positive SSTA,positive height and temperature anomalies. and a strong anomalous anticyclonic circulation appear. Diagnoses showed that such remarkable differences are mainly due to the strong geostrophy and baroclinity of the atmosphere at high latitudes. |
| |
| Keywords: | Rotational principle component Tropical mode and high latitude mode Geostrophy and baroclinity |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《气象学报》浏览原始摘要信息 |
| 点击此处可从《气象学报》下载免费的PDF全文 |
