...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Seasonal Evolution of Aleutian Low Pressure Systems: Implications for the North Pacific Subpolar Circulation
【24h】

Seasonal Evolution of Aleutian Low Pressure Systems: Implications for the North Pacific Subpolar Circulation

机译：阿留申低压系统的季节性演变：对北太平洋次极环流的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The seasonal change in the development of Aleutian low pressure systems from early fall to early winter is analyzed using a combination of meteorological reanalysis fields, satellite sea surface temperature (SST) data, and satellite wind data. The time period of the study is September-December 2002, although results are shown to be representative of the long-term climatology. Characteristics of the storms were documented as they progressed across the North Pacific, including their path, central pressure, deepening rate, and speed of translation. Clear patterns emerged. Storms tended to deepen in two distinct geographical locations-the Gulf of Alaska in early fall and the western North Pacific in late fall. In the Gulf of Alaska, a quasi-permanent "notch" in the SST distribution is argued to be of significance. The signature of the notch is imprinted in the atmosphere, resulting in a region of enhanced cyclonic potential vorticity in the lower troposphere that is conducive for storm development. Later in the season, as winter approaches and the Sea of Okhotsk becomes partially ice covered and cold, the air emanating from the Asian continent leads to enhanced baroclinicity in the region south of Kamchatka. This corresponds to enhanced storm cyclogenesis in that region. Consequently, there is a seasonal westward migration of the dominant lobe of the Aleutian low. The impact of the wind stress curl pattern resulting from these two regions of storm development on the oceanic circulation is investigated using historical hydrography. It is argued that the seasonal bimodal input of cyclonic vorticity from the wind may be partly responsible for the two distinct North Pacific subarctic gyres.
机译：利用气象再分析场，卫星海面温度（SST）数据和卫星风数据，对阿留申低压系统从初秋到初冬的季节性变化进行了分析。该研究的时间段为2002年9月至12月，尽管结果表明可以代表长期的气候学。记录了风暴在北太平洋上的发展过程的特征，包括其路径，中心压力，加深速率和平移速度。出现了清晰的图案。风暴倾向于在两个不同的地理位置加深-秋初的阿拉斯加湾和秋末的北太平洋西部。在阿拉斯加湾，SST分布中的准永久性“缺口”被认为具有重要意义。凹口的特征印在大气中，导致对流层下部的气旋势涡度增强，这有利于风暴的发展。在本季节的晚些时候，随着冬季临近，鄂霍次克海被部分冰雪覆盖和寒冷，从亚洲大陆散发出来的空气导致堪察加半岛以南地区的斜压增强。这对应于该地区增强的风暴回旋作用。因此，阿留申低压的优势叶有季节性的西移。使用历史水文研究了由这两个风暴发展区域引起的风应力卷曲模式对海洋环流的影响。有人认为，季节性的双峰来自风的旋风涡度输入可能部分负责两个不同的北太平洋亚北极回旋。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号