3 years ago

Circumglobal teleconnection and eddy control of variation in summer precipitation over Northwest China

Marco Y. T. Leung, Wen Zhou

Abstract

In this study, authors investigated both year-to-year variation and long-term changes in precipitation in Northwest China. Based on statistical analysis, anomalous regional rising motion and convergence of moisture flux are identified as the causes of year-to-year variation of precipitation in Northwest China. Aside from the year-to-year variation, long-term changes in these regional circulations also led to a significant enhancement of precipitation in Northwest China after the mid-1980 s. In addition, the changes in these regional circulations are controlled by anomalous eddies in the upper troposphere. The anomalous regional rising motion and the convergence of moisture flux are a result of the anomalous divergence of wind in the upper troposphere and southeasterly wind in the mid to lower troposphere. Both are induced by a negative center of eddy height in the upper troposphere to the west of Northwest China. It is also noted that the year-to-year variation of the negative center is concurrent with the circumglobal teleconnection. On the other hand, the long-term change in the negative center is concurrent with the weakening of midlatitude eddies in the mid-1980 s.

Publisher URL: https://link.springer.com/article/10.1007/s00382-017-3958-5

DOI: 10.1007/s00382-017-3958-5

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.