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Anonymous asked in 科學氣象 · 2 decades ago

何謂聖嬰現象??請說明的簡單一點!!

我看到YAHOO的新聞看到聖嬰現象,請問何謂聖嬰現象???請解釋的簡單一點可以嗎!!!謝謝!!

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  • 2 decades ago
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    在平均狀態,赤道太平洋的大氣環流及海面水溫分布如所示。西太平洋海溫高,為低壓帶及上昇氣流區; 東太平洋海溫低,是高壓帶及下降氣流區。水平方面則為:低層氣流由東往西,高層氣流由西往東,此一垂直環流稱為沃克環流( Walker circulation )。

      在赤道太平洋及秘魯外海,每年年底海溫皆會上升,原本由南往北的海流變成由北往南。 由於接近耶誕節,當地人稱此現象為El Nino ,意即年幼的基督(the Child Jesus,國內譯成「聖嬰」)。

      然而,每隔幾年海溫就會變得太高,甚至改變氣候型態及生態,造成災害。如1982/83 ENSO,東太平洋海溫異常曾高達4℃。目前「聖嬰」這個名詞,已被用來代表上述異常現象,而不是規律性季節變化的現象

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