基于COSMIC資料的邊界層高度時(shí)空特征分析

doi:10.3969/2015jms.0066

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基于COSMIC資料的邊界層高度時(shí)空特征分析
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                        10.3969/2015jms.0066
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(41405025;41475021);江蘇省自然科學(xué)基金資助項(xiàng)目(BK20140064)

Spatial and temporal characteristics of the boundary layer height based on COSMIC radio occultation data

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利用2007-2012年的COSMIC掩星折射率資料,結(jié)合改進(jìn)的折射率斷點(diǎn)法,分析了全球海上邊界層高度的季節(jié)、日變化特征,并引入尖銳系數(shù)對(duì)結(jié)果進(jìn)行了評(píng)估。邊界層高度大值區(qū)水平分布呈緯向不對(duì)稱,中低緯度地區(qū)的幾個(gè)區(qū)域邊界層最高,由赤道向南北兩極遞減。在副熱帶高壓控制的部分地區(qū),邊界層高度季節(jié)變化不明顯,而在大陸西海岸的盛行層狀云地區(qū),表現(xiàn)出一定的季節(jié)變化特征。邊界層高度的日變化相對(duì)較弱,并且在不同地區(qū)略有差異。尖銳系數(shù)的評(píng)估結(jié)果表明:尖銳系數(shù)在亞熱帶最大,折射率斷點(diǎn)法能獲取準(zhǔn)確的邊界層高度,而在赤道輻合帶和南太平洋輻合帶最小,邊界層高度定義相對(duì)模糊。

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Based on the COSMIC occultation data from 2007 to 2012, combined with the improved refractive breakpoint method, the seasonal and diurnal variation characteristics of the global maritime boundary layer height were analyzed. Fourthermore, the analysis results were also evaluated by sharpness coefficients. High boundary layer approximately distributes in an asymmetric zone, and in several regions of the low and middle latitudes there is the highest boundary layer, the height gradually decreased from the equator to the north and south poles. In some regions covered by the subtropical high, the seasonal variation of boundary layer height was not obvious, while in the area of the west coast of the mainland where the stratiform cloud is prevalent, there is some seasonal variation characteristics.The diurnal variation of the boundary layer height is relatively weak and is slightly different in different areas. The evaluation of the sharpness coefficients shows that the largest sharpness coefficient appears in the subtropical zone, and the refractive breakpoint method can provide accurate boundary layer height in the area, while in the equator convergence zone and the South Pacific convergence zone, the minimum sharpness coefficient makes the definition relatively fuzzy.

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廖麒翔,趙小峰,石漢青,黃思訓(xùn),項(xiàng)杰.基于COSMIC資料的邊界層高度時(shí)空特征分析.氣象科學(xué),2015,35(6):737-743 LIAO Qixiang, ZHAO Xiaofeng, SHI Hanqing, HUANG Sixun, XIANG Jie. Spatial and temporal characteristics of the boundary layer height based on COSMIC radio occultation data. Journal of the Meteorological Sciences,2015,35(6):737-743

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收稿日期:2015-06-16
最后修改日期:2015-08-15
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