Extraction method of real-time index of summer quasi-biweekly oscillation in Eurasian middle and high latitudes

An extraction method and Eurasian technology, which is applied in the field of extraction of real-time quasi-biweekly oscillation indices in Eurasian mid-high latitudes in summer, which can solve the problem of lack of real-time quasi-biweekly oscillation indices in mid-to-high latitudes.

Active Publication Date: 2022-04-26
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, there is currently a lack of research on real-time indices of quasi-biweekly oscillations in middle and high latitudes

Method used

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  • Extraction method of real-time index of summer quasi-biweekly oscillation in Eurasian middle and high latitudes
  • Extraction method of real-time index of summer quasi-biweekly oscillation in Eurasian middle and high latitudes
  • Extraction method of real-time index of summer quasi-biweekly oscillation in Eurasian middle and high latitudes

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Embodiment Construction

[0031] Attached below Figure 1-14 The technical scheme of the present invention will be further described.

[0032] As shown in the figure, the extraction method of the real-time index of the Eurasian mid-high latitude summer quasi-biweekly oscillation includes the following steps:

[0033] S1: Bandpass the 10-30 days lagged by -6, -3 and 0 days in the middle and high latitudes from May to September in the summer of 1979-2018, that is, 0°E-160°E, 30°N-75°N Filtered 500hPa geopotential height field for EEOF analysis;

[0034]This area also covers the upper and lower reaches of the westerly belt, which has a greater impact on my country's weather and climate, including the key areas in the middle and high latitudes of my country's large-scale weather, such as the Ural Mountains, Lake Baikal, and Yakutsk. The first two modes of the EEOF analysis explained 11.33% and 11.17% of the population variance ( figure 2 ), the third and fourth modes of EEOF analysis accounted for 6.30...

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Abstract

The invention discloses a method for extracting a real-time index of the summer quasi-biweekly oscillation (QBWO) in Eurasian middle and high latitudes. First, 1979-2018 summer 5-9 months in the middle and high latitudes -6, -3 and 0 days behind the 10 ‑30-day band-pass filtered 500hPa geopotential height field is analyzed by EEOF, and the first 4 modes are obtained; secondly, the non-filtering method is used to extract 10‑30-day 500hPa geopotential height anomaly field; it will include ‑6, ‑3 and The 0-day unfiltered 10-30-day 500hPa geopotential height anomaly field is projected onto the first two EEOF modes to obtain the real-time index of the Eurasian mid-high latitude quasi-biweekly oscillation; then it will include ‑6, ‑3 and 0 The unfiltered 10-30-day 500hPa geopotential height anomaly field is projected onto the third and fourth EEOF modes to obtain the second real-time index of the Eurasian mid-high latitude quasi-biweekly oscillation. The invention grasps the key areas of mid-high latitude QBWO and its circulation structure and propagation characteristics, embodies the relationship between mid-high latitude QBWO and the weather and climate in China and even East Asia, and is applied to real-time monitoring and provides reference for the evaluation of model QBWO simulation capabilities.

Description

technical field [0001] The invention relates to an index extraction method, in particular to an extraction method for a real-time index of a summer quasi-biweekly oscillation in middle and high latitudes of Eurasia. Background technique [0002] Quasi-biweekly oscillation (QBWO) is also called Sub-monthly Oscillation by scholars (Yokoi and Satomura, 2006; Wen et al., 2011), which is an important phenomenon whose time scale is smaller than seasonal variation , a large number of studies have shown that QBWO is in monsoon or tropical regions (Lau et al., 1988; Chen and Chen, 1995a; Fukutomi and Yasunari, 1999, Krishnamurti and Bhalme, 1976; Krishnamurti and Ardanuy, 1980), mid-high latitudes (Wu Bingyi et al., 1994; Li Chongyin and Zhou Yaping, 1995), and even globally (Kikuchi and Wang, 2009). [0003] At present, domestic research on QBWO real-time index mainly focuses on the research on signals from middle and low latitudes: Lee et al. (2013) proposed a real-time index for ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/00
CPCG01W1/00Y02A90/10
Inventor 姚素香孙添乐夏依聪
Owner NANJING UNIV OF INFORMATION SCI & TECH
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