Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0303.1 |
Seasonal and Regional Variations of Long-Term Changes in Upper-Tropospheric Jets from Reanalyses | |
Manney, Gloria L.1,2; Hegglin, Michaela I.3 | |
2018 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:1页码:423-448 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
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 inmost 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. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429528800025 |
WOS关键词 | GENERAL-CIRCULATION MODEL ; EDDY-DRIVEN JET ; CLIMATE-CHANGE ; NORTHERN-HEMISPHERE ; ARCTIC AMPLIFICATION ; SOUTHERN-HEMISPHERE ; MIDLATITUDE WEATHER ; TROPICAL EXPANSION ; CMIP5 PROJECTIONS ; SUBTROPICAL JET |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20325 |
专题 | 气候变化 |
作者单位 | 1.NorthWest Res Associates, Socorro, NM 87801 USA; 2.New Mexico Inst Min & Technol, Socorro, NM 87801 USA; 3.Univ Reading, Reading, Berks, England |
推荐引用方式 GB/T 7714 | Manney, Gloria L.,Hegglin, Michaela I.. Seasonal and Regional Variations of Long-Term Changes in Upper-Tropospheric Jets from Reanalyses[J]. JOURNAL OF CLIMATE,2018,31(1):423-448. |
APA | Manney, Gloria L.,&Hegglin, Michaela I..(2018).Seasonal and Regional Variations of Long-Term Changes in Upper-Tropospheric Jets from Reanalyses.JOURNAL OF CLIMATE,31(1),423-448. |
MLA | Manney, Gloria L.,et al."Seasonal and Regional Variations of Long-Term Changes in Upper-Tropospheric Jets from Reanalyses".JOURNAL OF CLIMATE 31.1(2018):423-448. |
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