TY - JOUR
T1 - On the Linkage Between the Asian Summer Monsoon and Tropopause Folds
AU - Wu, Yutian
AU - Chen, Gang
AU - Taylor, Lindsey
AU - Zhang, Pengfei
N1 - Funding Information:
The authors thank helpful discussions with Bill Randel, Joowan Kim, and Steven Feldstein during the AMS AOFD meeting. We thank the ECMWF for providing the ERA-Interim reanalysis data set. The ERA-Interim data used in this paper are available at http://apps.ecmwf.int/datasets/data/ interim-full-daily/levtype=ml/.om The computations were carried out with high-performance computing support provided by NCAR’s Computational and Information Systems Laboratory, which is sponsored by the National Science Foundation (NSF). The data produced for and analyzed in this paper are archived on the High Performance Storage System (HPSS) at NCAR and are freely available via contacting Y. W. (yutianwu@ldeo.columbia.edu). Y. W. is supported, in part, by the NSF award AGS-1653878. G. C. is supported by the NSF awards AGS-1742178 and AGS-1608775. P. Z. is supported by the NSFAGS-1406962.
Publisher Copyright:
©2018. The Authors.
PY - 2018/2/27
Y1 - 2018/2/27
N2 - This study uses a set of idealized aquaplanet model experiments to investigate the linkage between the Asian summer monsoon circulation and tropopause fold activity. It is found that folds tend to occur on the northwestern side of the upper-level anticyclone associated with the monsoon circulation and are generated due to intensified monsoon circulation and resulting intensified subsidence. In addition, the impact of tropopause folds on extreme rainfall events is also examined. It is found that while the likelihood of extreme rainfall is largely decreased at and upstream of the occurrence of folds, the likelihood is significantly increased downstream. This pattern of suppression of extreme rainfall upstream and promotion downstream also persists for about 1–2 days, which likely suggests a positive feedback between extreme rainfall downstream and tropopause folds. Finally, changes in tropopause folds with monsoon intensity are also discussed.
AB - This study uses a set of idealized aquaplanet model experiments to investigate the linkage between the Asian summer monsoon circulation and tropopause fold activity. It is found that folds tend to occur on the northwestern side of the upper-level anticyclone associated with the monsoon circulation and are generated due to intensified monsoon circulation and resulting intensified subsidence. In addition, the impact of tropopause folds on extreme rainfall events is also examined. It is found that while the likelihood of extreme rainfall is largely decreased at and upstream of the occurrence of folds, the likelihood is significantly increased downstream. This pattern of suppression of extreme rainfall upstream and promotion downstream also persists for about 1–2 days, which likely suggests a positive feedback between extreme rainfall downstream and tropopause folds. Finally, changes in tropopause folds with monsoon intensity are also discussed.
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U2 - 10.1002/2017JD027870
DO - 10.1002/2017JD027870
M3 - Article
AN - SCOPUS:85042265044
SN - 2169-897X
VL - 123
SP - 2037
EP - 2049
JO - Journal of Geophysical Research: Atmospheres
JF - Journal of Geophysical Research: Atmospheres
IS - 4
ER -