基于微波探測資料的全球大氣亮溫長期變化趨勢研究

doi:10.3969/2015jms.0074

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基于微波探測資料的全球大氣亮溫長期變化趨勢研究
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                        10.3969/2015jms.0074
                    
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基金項目:國家自然科學基金資助項目(91337218)和江蘇省自然科學基金資助項目(BK2011039)

Long-term trends of brightness temperature based on microwave sounding data

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本文使用1978-2013年美國大氣海洋局NOAA研發(fā)的STAR V3.0版本的MSU/AMSUA逐月亮溫格點數(shù)據(jù),引入集合經(jīng)驗模式分解(EEMD)方法,研究了高空大氣亮溫的非線性變化趨勢,尤其注重亮溫氣候趨勢的時間演變特征,并與傳統(tǒng)線性回歸(CLR)方法做了對比研究。結(jié)果表明,在全球?qū)α鲗釉鰷亍⑵搅鲗咏禍氐拇蟊尘跋?基于EEMD的亮溫非線性趨勢演變特征表現(xiàn)為:近10 a對流層中、高層全球平均增暖趨勢放緩,甚至出現(xiàn)輕微的降溫趨勢;北半球?qū)α鲗釉雠紫瘸霈F(xiàn)在北極,隨后向低緯度方向延伸。北極對流層增暖向上影響高層大氣,最高可以擴展到平流層低層。南半球?qū)α鲗又械途暥鹊貐^(qū)受北半球大氣影響也出現(xiàn)增溫。另外,近10 a南極地區(qū)出現(xiàn)顯著的獨立增溫現(xiàn)象。平流層變冷北半球最早從中緯度地區(qū)開始發(fā)生,變冷逐漸增強的同時向極地和低緯度兩側(cè)擴張。南極上空平流層大氣早期也出現(xiàn)顯著變冷,然而隨著2000年以后南極大范圍增暖,平流層變冷逐漸轉(zhuǎn)移到中低緯地區(qū)。

Abstract:

By using the STAR MSU/AMSU version 3.0 monthly brightness temperature data developed by National Oceanic and Atmospheric Administration(NOAA) during 1978 to 2013, with the Ensemble Empirical Mode Decomposition(EEMD) method, the nonlinear trend of monthly global mean brightness temperature of the upper air and time evolution characteristics of brightness temperature climatic trend are estimated, moreover, the result is compared with that using the Classical Linear Regression(CLR) method. Results show that under the background of warming troposphere and cooling stratosphere, the nonlinear evolution features of the brightness temperature derived by EEMD reveal that the warming trend of the troposphere at mid-high level slows down and even there exists a reverse trend in recent years. The tropospheric warming first occurs in the Arctic, and then gradually extends to the lower latitudes in the northern hemisphere. The tropospheric warming in the polar region even extends up to the lower stratosphere. In the southern hemisphere, the troposphere warming in the mid-low latitude is mainly affected by the atmospheric circulation. In addition, there has been an independent warming phenomenon in the Antarctic in recent decade. The stratospheric cooling first appeared in the middle latitude and then extended gradually equatorward and poleward. A significant cooling of the stratosphere has been found in the Antarctic, and then extended to the lower atmosphere. However, since 2000, with the appearance of a more extensive warming in the Antarctic, the stratosphere cooling has been gradually moving to the middle and low latitude regions.

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李剛,張鷺.基于微波探測資料的全球大氣亮溫長期變化趨勢研究.氣象科學,2016,36(1):10-19 LI Gang, ZHANG Lu. Long-term trends of brightness temperature based on microwave sounding data. Journal of the Meteorological Sciences,2016,36(1):10-19

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收稿日期:2015-08-12
最后修改日期:2015-09-29
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在線發(fā)布日期: 2016-04-11
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