ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis of Climate Characteristics of Northeast Cold Vortex Based on High Resolution Data
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
Based on the reanalysis data of atmospheric circulation field with ERA5 time resolution of hourly and horizontal resolution of 0.25 ° * 0.25 °, combined with temperature field, the Northeast cold vortex process from 1979 to 2023 was objectively identified, and the climate and climate change characteristics of the Northeast cold vortex were analyzed. The results indicate that: (1) there were more Northeast cold vortex processes in the early 1990s and mid-2000s, and relatively fewer in the 2010s; The distribution of Northeast cold vortex is highest in June and lowest in March; The average duration is 4 days, with April being the shortest and January the longest. (2) The Northeast cold vortex is mostly generated between 45 ° -60 ° N and disappears (moves out) between 40 ° -55 ° N. The center of the Northeast cold vortex is mainly concentrated between 115 ° -135 ° E and 45 ° -55 ° N. The Northeast cold vortex mainly moves towards the east and southeast. (3) To the east of 120 ° E, the average strength of the cold vortex is stronger in the northeast and weaker in the west. The intensity of Northeast cold vortex showed a significant weakening trend from 1979 to 2023; The intensity distribution of the Northeast cold vortex within the year is stronger in the cold season than in the warm season. The strength difference between the grids in the analysis area is the largest in March, and the strength difference between the grids is the smallest in June. (4) There is a significant negative correlation between the intensity of the Northeast cold vortex in the Northeast region and the temperature in most months; There is a significant positive correlation with precipitation in April and June.
Keywords:
Project Supported:
Clc Number:
Mobile website
