双月刊

ISSN 1006-9895

CN 11-1768/O4

+高级检索 English
局地蒸发和外部水汽输送对松花江流域夏季降水的贡献
作者:
作者单位:

作者简介:

通讯作者:

基金项目:

中央引导地方专项ZY18C12,国家自然科学基金项目41675076、41605068,黑龙江省龙云气象科技有限责任公司气象院士工作站开放研究基金项目YSZD201701


Contributions of Local and Remote Water Vapor Transport to Precipitation Variations over Songhua River Basin
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    本文基于Brubaker二元模型,采用JRA-55再分析资料定量研究了局地蒸发和外部水汽输送对松花江流域夏季气候态降水及其年际变率的相对贡献,并探讨了相应的物理机制。气候平均而言,外部水汽输送是松花江流域初夏(5~6月)和盛夏(7~8月)降水的最主要水汽源。受西风带影响,初夏自西边界进入松花江流域的水汽贡献占主导,外部水汽输送对当地降水的贡献为78.9%,源自蒸发的水汽贡献为21.1%。较之初夏,由于盛夏来自南边界的水汽输送加倍,外部水汽输送贡献增加,外部水汽输送和蒸发对降水贡献分别为86%和14%。JRA-55再分析资料可以合理再现观测降水演变,1961~2016年JRA-55再分析资料降水与观测在初夏与盛夏的相关系数分别可以达到0.73和0.83。研究发现,初夏,由于西南季风异常导致的南边界进入的水汽输送异常是松花江流域降水年际变率的主要原因,自西边界、北边界进入的水汽输送与降水呈现显著负相关,初夏局地蒸发的贡献不显著,该水汽输送异常对应的环流型易发生在El Ni?o衰减年初夏。盛夏来自南边界的水汽输送起主导作用,局地蒸发贡献与降水变化显著负相关,海温强迫作用对该环流异常的强迫并不显著,中高纬度大气内部变率影响占主导。由于盛夏降水与地表温度在盛夏期间显著负相关,盛夏时期降水偏少时,温度偏高,蒸发偏强,进而蒸发水汽对降水贡献增加。

    Abstract:

    In this study, the authors used the Brubaker model to investigate the relative contributions of local and remote atmospheric moisture fluxes to the summer precipitation over the Songhua River basin and its interannual variability. Climatologically, due to the prevailing westerly wind in early summer (May–June), remote atmospheric moisture is the dominant contributor to early summer precipitation, accounting for 78.9%. Accordingly, the local evaporation contribution is 21.1%. In late summer (July–August), the East Asian summer monsoon brings more moisture via the southern boundary, so the contribution of remote moisture increases to 86%, and that of local evaporation is reduced to 14%. JRA-55 (Japanese 55-year atmospheric reanalysis) reanalysis data can well capture the interannual variation of summer precipitation over the Songhua River basin, with the correlation coefficients of the observations in early and late summer being 0.73 and 0.83 for the period 1961–2016, respectively. This shows that the moisture flux via the southern boundary caused by the stronger southwest monsoon plays the dominant role in early summer, and the moisture fluxes via the western and northern boundaries are significantly negatively correlated with early summer precipitation. The contribution of local evaporation is not statistically significant. Moisture flux anomalies tend to occur in the early summer with the decay of El Ni?o. In late summer, a significantly positive contribution is made by moisture flux via the southern boundary and a negative contribution by local evaporation. The effect of oceanic forcing on the late-summer precipitation anomaly is not significant, and internal atmospheric variability dominates. The significant negative contribution of local evaporation is due to the significant negative correlation between the surface temperature and precipitation. When precipitation is lower than normal, the surface temperature becomes warmer than normal, so there is more evaporation and a greater contribution from local evaporation to precipitation.

    参考文献
    相似文献
    引证文献
引用本文

李永生,张丽霞,王波.局地蒸发和外部水汽输送对松花江流域夏季降水的贡献.大气科学,2020,44(3):611~624 LI Yongsheng, ZHANG Lixia, WANG Bo. Contributions of Local and Remote Water Vapor Transport to Precipitation Variations over Songhua River Basin. Chinese Journal of Atmospheric Sciences (in Chinese),2020,44(3):611~624

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-06-15
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2020-05-26
  • 出版日期: