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| DOI | 10.1175/JCLI-D-22-0930.1 |
| Increases in the Local Eddy Energetics of the Extratropical Atmosphere over the Last Four Decades | |
| 发表日期 | 2024 |
| ISSN | 0894-8755 |
| EISSN | 1520-0442 |
| 起始页码 | 37 |
| 结束页码 | 12 |
| 卷号 | 37期号:12 |
| 英文摘要 | Changes in the vertical and meridional temperature gradients of the atmosphere drive competing in fl uences on storm-track activity. We apply local eddy energetics to the ERA5, JRA-55, MERRA-2, and NCEP-2 reanalyses during 1980 - 2020 to determine the locations, magnitudes, and trends of the energy transfer mechanisms for synoptic-scale eddies. Eddy kinetic energy (EKE) increases more rapidly in the Southern Hemisphere at all altitudes and seasons, with larger increases during austral winter and spring. In the Northern Hemisphere, increases occur within the Atlantic and Paci fi c storm tracks at pressures below 300 hPa but only during boreal winter and spring and con fi ned within a narrow zonal band; EKE decreases during boreal summer and fall. Most EKE changes correspond with trends in baroclinic energy conversion upstream of storm tracks and appear to align with increases in the growth rate of the most unstable baroclinic mode. Barotropic energy conversion of EKE to the mean fl ow becomes locally more intense downstream of the storm tracks. Conversion of EKE to long-period eddies plays a minor role averaged over a hemisphere but can be important locally. The primary strengthening pathway for removal of EKE is a combination of surface friction and viscous dissipation. The increased baroclinic conversion in the Southern Hemisphere appears related to upper-level tropical temperature increases. In the Northern Hemisphere, increased baroclinic conversion is enabled by a combination of increased vertical heat fl uxes and a region of temperature increases within 30 degrees - 60 degrees N. |
| 英文关键词 | Eddies; Fluxes; Climate change; Kinetic energy; Reanalysis data; Trends |
| 语种 | 英语 |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| WOS类目 | Meteorology & Atmospheric Sciences |
| WOS记录号 | WOS:001239137100001 |
| 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/289388 |
| 作者单位 | Yale University |
| 推荐引用方式 GB/T 7714 | . Increases in the Local Eddy Energetics of the Extratropical Atmosphere over the Last Four Decades[J],2024,37(12). |
| APA | (2024).Increases in the Local Eddy Energetics of the Extratropical Atmosphere over the Last Four Decades.JOURNAL OF CLIMATE,37(12). |
| MLA | "Increases in the Local Eddy Energetics of the Extratropical Atmosphere over the Last Four Decades".JOURNAL OF CLIMATE 37.12(2024). |
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