熱帶大氣對(duì)非絕熱加熱的響應(yīng)及其與ENSO循環(huán)關(guān)系

doi:10.3969/2014jms.0088

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熱帶大氣對(duì)非絕熱加熱的響應(yīng)及其與ENSO循環(huán)關(guān)系
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                        10.3969/2014jms.0088
                    
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基金項(xiàng)目:科技部國(guó)際合作項(xiàng)目(2010DFA24650);國(guó)家自然科學(xué)基金資助項(xiàng)目(41175061)

Response of tropical atmosphere to diabatic heating and its relation with ENSO

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通過(guò)求解赤道β平面上的線性運(yùn)動(dòng)方程,研究了熱帶大氣對(duì)主要由海洋熱狀況異常導(dǎo)致的大氣非絕熱加熱的響應(yīng),并探討了該過(guò)程與ENSO循環(huán)的關(guān)系。結(jié)果表明,非絕熱加熱的直接作用及其產(chǎn)生的Kelvin波、Rossby短波是大氣零階的擾動(dòng)位勢(shì)和緯向風(fēng)速變化的原因。在El Nino期間,大洋西部首先發(fā)展出正的大氣位勢(shì)異常。但隨著海洋熱狀況的正異常的持續(xù),隨之在大洋西部即開(kāi)始孕育和發(fā)展,導(dǎo)致熱帶太平洋海氣耦合系統(tǒng)回歸正常狀態(tài),甚至是轉(zhuǎn)向La Nina的大氣異常狀態(tài)或系統(tǒng),其標(biāo)識(shí)是非絕熱的異常加熱所激發(fā)的大氣Kelvin波的產(chǎn)生和東傳,并伴隨正位勢(shì)異常的大值向東移動(dòng)和大洋西部正的位勢(shì)異常減弱,信風(fēng)由此而增強(qiáng)。在La Nina的盛期,海洋熱狀況存在負(fù)異常(即弱于平均狀態(tài)),則將有相反的過(guò)程。

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By resolving the linear adiabatic equations on equator β plane, the response of tropical atmosphere to diabatic heating caused by oceanic heating anomaly was studied, moreover, its relations with ENSO were also analyzed. Results show that the direct effect of diabatic heating and its resulting Kelvin wave, Rossby short wave are the reasons for the variation of zonal wind speed and disturbed geopotency of atmospheric zero class. During El Nino period, the positive atmospheric geopotential anomaly firstly developed in the West Pacific, but with the persistency of the positive anomaly of the oceanic heating, an atmospheric anomaly occurred and developed in the West Pacific, which caused air-sea coupled system to return to normal condition or to La Nina. The identification of the above situation were the occurring and extending eastward of Kelvin wave triggered by diabatic heating anomaly, companied by the eastward movement of the large value of positive geopotential anomaly and the weakening of the positive geopotential anomaly in the West Pacific, so that the trade wind could strengthen. During the period of the strongest La Nina, the oceanic heating turned to be negative anomaly(weaker than the average), it means the reverse situation could take place.

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陳華,霍也.熱帶大氣對(duì)非絕熱加熱的響應(yīng)及其與ENSO循環(huán)關(guān)系.氣象科學(xué),2015,35(5):605-609 CHEN Hua, HUO Ye. Response of tropical atmosphere to diabatic heating and its relation with ENSO. Journal of the Meteorological Sciences,2015,35(5):605-609

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收稿日期:2014-04-19
最后修改日期:2014-09-12
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在線發(fā)布日期: 2015-11-13
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