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| DOI | 10.1175/JCLI-D-20-0225.1 |
| Atmospheric subseasonal variability and circulation regimes: Spectra, trends, and uncertainties | |
| Žagar N.; Zaplotnik Z.; Karami K. | |
| 发表日期 | 2020 |
| ISSN | 08948755 |
| 起始页码 | 9375 |
| 结束页码 | 9390 |
| 卷号 | 33期号:21 |
| 英文摘要 | The globally integrated subseasonal variability associated with the two main atmospheric circulation regimes, the balanced (or Rossby) and unbalanced (or inertia-gravity) regimes, is evaluated for the four reanalysis datasets: ERA-Interim, JRA-55, MERRA, and ERA5. The results quantify amplitudes and trends in midlatitude traveling and quasistationary Rossby wave patterns as well as in the equatorial wave activity across scales. A statistically significant reduction of subseasonal variability is found in Rossby waves with zonal wavenumber κ = 6 along with an increase in variability in wavenumbers κ = 3-5 in the summer seasons of both hemispheres. The four reanalyses also agree regarding increased variability in the large-scale Kelvin waves, mixed Rossby-gravity waves, and westward-propagating inertio-gravity waves with the lowest meridional mode. The amplitude and sign of trends in inertia-gravity modes with smaller zonal scales and greater meridional modes differ between the ERA-Interim and JRA-55 datasets on the one hand and the ERA5 and MERRA data on the other. An increased variability in the ERA-Interim and JRA-55 accounts for positive trends in their total subseasonal variability. © 2020 American Meteorological Society. |
| 英文关键词 | Data assimilation; Planetary waves; Reanalysis data; Rossby waves; Seasonal variability; Tropical variability |
| 语种 | 英语 |
| scopus关键词 | Climate models; Climatology; Atmospheric circulation; Atmospheric subseasonal variability; Equatorial waves; Gravity modes; Quasi-stationary; Rossby-gravity wave; Subseasonal variability; Zonal wavenumber; Gravity waves; atmospheric circulation; data assimilation; planetary wave; Rossby wave; seasonal variation; trend analysis; uncertainty analysis; zonal wind |
| 来源期刊 | Journal of Climate
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/178716 |
| 作者单位 | Meteorological Institute, Center for Earth System Research and Sustainability, Universitat Hamburg, Hamburg, Germany; Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia |
| 推荐引用方式 GB/T 7714 | Žagar N.,Zaplotnik Z.,Karami K.. Atmospheric subseasonal variability and circulation regimes: Spectra, trends, and uncertainties[J],2020,33(21). |
| APA | Žagar N.,Zaplotnik Z.,&Karami K..(2020).Atmospheric subseasonal variability and circulation regimes: Spectra, trends, and uncertainties.Journal of Climate,33(21). |
| MLA | Žagar N.,et al."Atmospheric subseasonal variability and circulation regimes: Spectra, trends, and uncertainties".Journal of Climate 33.21(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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