冬季兩類ENSO事件對(duì)歐亞地區(qū)阻塞高壓的影響
[Abstract]:Based on the reanalysis data released by the US Environmental Forecasting Center and the US Center for Atmospheric Research from 1979 to 2015 and the El Ni?O/La Ni?A Modoki anomaly index (EMI) data provided by the Japan Marine Science and Technology Center, the effects of two types of El Ni?O-Southern Oscillation (ENSO) events on the blocking high (blocking high) in the key Eurasian regions in the winter of recent 36 years were studied. The results show that the instantaneous blockage in the three key regions of Eurasia decreases in varying degrees when the El Ni?O (EN) event occurs, especially in the Ural Mountains, where the instantaneous blockage decreases by 32%, and the average duration of the blockage decreases by 14.7%; the La Ni?A (LN) event causes the instantaneous blockage in the Ural Mountains by 53% and the blockage events are flat. The average duration increased by 27.9%, but the average duration of blocking events in the Okhotsk Sea area decreased by 24%. The influence of ENSO Modoki on Eurasian blocking is different from that of traditional ENSO events. In the central Okhotsk Sea area, the instantaneous blockade is the most, reaching 55%, and the average duration of blocking events increases by 18.2%; in the case of LN Modoki, the instantaneous blockade is 15%, the average duration of blocking events is 25%, but in the Okhotsk Sea area, the instantaneous blockade is 29%, and the average duration of blocking events is 10.2%. The direct reason for the difference is that the two types of ENSO events have different effects on the atmospheric circulation. It can be seen from the configuration of 500 hPa potential height field and wind field that there is cyclonic circulation anomaly in the wind field of Ural Mountains and Okhotsk Sea when the EN event occurs. Negative anomalies in the height field of the conjunctive potential lead to less resistive height; large-scale anticyclonic circulation anomalies occur in the Ural Mountains and areas north-west of Lake Baikal when LN events occur, and 500 hPa geopotential height is relatively strong and resistive height is relatively high; and 500 hPa geopotential height in the three key regions of Eurasia has different degrees of positive anomalies when EN Modoki events occur. Under the LN Modoki event, the geopotential heights in the Ural Mountains and the Hubei side of Baikal are higher, which is beneficial to the high resistance in these two areas, but not conducive to the formation of the high resistance in the Okhotsk Sea area.
【作者單位】: 蘭州大學(xué)大氣科學(xué)學(xué)院半干旱氣候變化教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(41305105) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(LZUJBKY-2016-16)
【分類號(hào)】:P424;P732
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