應用NASA MERRA再分析資料對一次高原切變線的診斷分析

doi:10.3969/2017jms.0073

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應用NASA MERRA再分析資料對一次高原切變線的診斷分析
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                        10.3969/2017jms.0073
                    
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基金項目:國家自然科學基金資助項目（41675057；41765003；91337215）；公益性行業(yè)（氣象）科研專項（GYHY201206042）

Diagnosis analysis on a plateau shear line process based on NASA MERRA reanalysis datasets

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利用2016年6月29—30日地面及高空常規(guī)觀測資料、CMORPH融合降水資料以及時空分辨率較高的NASA MERRA 0.625°×0.5°逐3 h再分析資料，對一次高原切變線過程進行了天氣動力學診斷分析。運用廣義位溫、廣義濕位渦和渦生參數(shù)等診斷量對切變線系統(tǒng)的生成及其降水分布進行分析。結果顯示：廣義位溫等值線梯度大值區(qū)與大氣水汽的聚集區(qū)相對應。切變線降水的發(fā)生、發(fā)展與廣義濕位渦的分布及演變有較好的對應關系，低層大氣廣義濕位渦的正異常大值對降水發(fā)生有一定關聯(lián)。廣義濕位渦正負異常值之間的零線可較好表征高原切變線的位置。廣義濕位渦中心強度對切變線生成與發(fā)展有一定指示意義。渦生參數(shù)可作為高原切變線生成和加強的一個明顯前兆信號。

Abstract:

By using the conventional ground and high-altitude observations, the CMORPH blended precipitation and the high-resolution NASA MERRA reanalysis datasets (with spatial resolution of 0.625°×0.5ånd temporal resolution of three hours), the synoptic-dynamic diagnosis were performed on the process of plateau shear line during 29-30 June 2016. The formation of the shear line and the related precipitation were analyzed by multi-physical quantities involve the generalized potential temperature, the generalized moist potential vorticity and the vortex generation parameter, etc. Results indicate that the great value area of generalized potential temperature gradient is coincident with the region where water vapor accumulated. The formation and development of shear line precipitation is connected with the distribution and evolution of generalized moist potential vorticity, and positive low-level generalized moist potential vorticity anomaly always accompanies the occurrence of precipitation. In addition, there is a close spatial relationship between the zero line of generalized moist potential vorticity and the plateau shear line, and the intensity of the generalized moist potential vorticity center may indicate the development of shear line. Moreover, the vortex generation parameter can be regarded as a significant precursory signal for the building and strength of the plateau shear line.

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陳佳,李國平.應用NASA MERRA再分析資料對一次高原切變線的診斷分析.氣象科學,2018,38(3):320-330 CHEN Jia, LI Guoping. Diagnosis analysis on a plateau shear line process based on NASA MERRA reanalysis datasets. Journal of the Meteorological Sciences,2018,38(3):320-330

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收稿日期:2017-04-01
最后修改日期:2017-09-07
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在線發(fā)布日期: 2018-07-16
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