THE LAG LINKAGE BETWEEN TELECONNECTION PATTERNS IN THE 500MB HEIGHT FIELDS DURING NORTHERN HEMISPHERE WINTER

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  • 北半球冬季500 mb面高度場におけるテレコネクションパターンの連鎖について
  • キタハンキュウ トウキ 500mbメン コウドバ ニ オケル テレコネクション

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Abstract

The lag linkage between different teleconnection patterns in the 500mb height field during Northern Hemisphere winter is investigated both statistically and analytically in this study.<br> On the basis of 5-day averaged 500mb heights data during winter in 1946-1985, three teleconnection patterns (E1 pattern, E2 pattern, E3 pattern) over Eurasia and three teleconnection patterns (P1 pattern, P2 pattern, P3 pattern) over the Pacific_??_North America are obtained by means of a prinicipal component analysis (Fig. 2).<br> Lag-correlation coeficients between different component scores are computed. It is found in the result that the couple of E3 pattern (-over northern Europe, +over Central Asia, -over Siberia, +over the eastward of Japan) and P2 pattern (+over Pacific, -over the near of Alaska, +over the center of North America, -over the southeast of North America) have very high lag-correlation (Fig. 3).<br> The cases in which the lag linkage between E3- pattern and P2- pattern occurred are picked up. The lag linkage between E3-pattern and P2- pattern is remarkable in the actual cases, but no remarkable lag linkage appeared between E3+ pattern and P2+ pattern (Fig. 5).<br> The activity flux of stationary waves is examined during the stage when the lag linkage between E3- pattern and P2- pattern occurred. In this stage, the activity of stationary waves propagates from Central Asia to the Pacific in the low latitude and the activity propagates from the Pacific in the low latitude to North America (Fig. 9). For the lag linkage between the teleconnection patterns, the barotropic propagation of stationary waves plays an important role resultedly (Fig. 7).<br> Relationships between this linkage of teleconnection patterns and the circulation regimes over the tropical Pacific are also investigated. It is shown that the lag linkage between E3- pattern and P2- pattern occurs when Southern Oscillation Index is high (the sea surface pressure at Darwin is relatively low compared with the one at Tahiti) and the tropical convection over western Pacific is active (Fig. 11 and Fig. 13).<br> From the results of preceding analysis, we discussed about the inferred mechanisms for the lag linkage between E3-pattern and P2-pattern.

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