DOI: 10.1175/JCLI-D-17-0303.1
Scopus记录号: 2-s2.0-85040605955
论文题名: Seasonal and regional variations of long-term changes in upper-tropospheric jets from reanalyses
作者: Manney G.L. ; Hegglin M.I.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 1 起始页码: 423
结束页码: 448
语种: 英语
英文关键词: Atmosphere
; Jets
; Reanalysis data
; Trends
; Upper troposphere
Scopus关键词: Earth atmosphere
; Jets
; Tropics
; Troposphere
; Upper atmosphere
; Wind
; Northern hemisphere
; Reanalysis
; Regional variation
; Seasonal variation
; Southern Hemisphere
; Trends
; Tropospheric jets
; Upper troposphere
; Fighter aircraft
; jet stream
; long-term change
; Northern Hemisphere
; seasonal variation
; Southern Hemisphere
; trend analysis
; troposphere
; wind velocity
; Africa
; Far East
; Pacific Ocean
; Pacific Ocean (East)
英文摘要: Long-term changes in upper-tropospheric jet latitude, altitude, and strength are assessed for 1980-2014 using five modern reanalyses: MERRA, MERRA-2, ERA-Interim, JRA-55, and NCEP CFSR. Changes are computed from jet locations evaluated daily at each longitude to analyze regional and seasonal variations. The changes in subtropical and polar (eddy driven) jets are evaluated separately. Good agreement among the reanalyses in many regions and seasons provides confidence in the robustness of the diagnosed trends. Jet shifts show strong regional and seasonal variations, resulting in changes that are not robust in zonal or annual means. Robust changes in the subtropical jet indicate tropical widening over Africa except during Northern Hemisphere (NH) spring, and tropical narrowing over the eastern Pacific in NH winter. The Southern Hemisphere (SH) polar jet shows a robust poleward shift, while the NH polar jet shifts equatorward in most regions/seasons. Both subtropical and polar jet altitudes typically increase; these changes are more robust in the NH than in the SH. Subtropical jet wind speeds have generally increased in winter and decreased in summer, whereas polar jet wind speeds have weakened (strengthened) over Africa and eastern Asia (elsewhere) during winter in both hemispheres. The Asian monsoon has increased in area and appears to have shifted slightly westward toward Africa. The results herein highlight the importance of understanding regional and seasonal variations when quantifying long-term changes in jet locations, the mechanisms for those changes, and their potential human impacts. Comparison of multiple reanalyses is a valuable tool for assessing the robustness of jet changes. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111728
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: North West Research Associates, New Mexico Institute of Mining and Technology, Socorro, NM, United States; University of Reading, Reading, United Kingdom
Recommended Citation:
Manney G.L.,Hegglin M.I.. Seasonal and regional variations of long-term changes in upper-tropospheric jets from reanalyses[J]. Journal of Climate,2018-01-01,31(1)