大氣環(huán)流模式PIAP3物理過程對溫度的調整關系分析

doi:10.3969/2013jms.0088

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大氣環(huán)流模式PIAP3物理過程對溫度的調整關系分析
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                        10.3969/2013jms.0088
                    
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基金項目:國家重點基礎研究發(fā)展計劃(973計劃)項目(2013CB956203);國家自然科學基金資助項目(41475071)

Analysis of physical parameterizations in PIAP3 on temperature tendency

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摘要:

對大氣環(huán)流模式PIAP3進行了30 a季節(jié)運行, 對其物理過程的溫度調整傾向進行了系統(tǒng)分析, 研究發(fā)現(xiàn):大氣總輻射效應以冷卻為主, 長波輻射溫度傾向與溫度本身具有負反饋關系, 與云量有正反饋關系。太陽短波輻射加熱傾向直接反映了太陽直射點冬夏的季節(jié)轉換;深厚對流和大尺度降水, 作為大氣的重要加熱機制, 是輻射冷卻的重要平衡因子, 兩者地域互補, 前者加熱熱帶深厚大氣, 后者主要加熱中高緯對流層中低層大氣。干、濕對流是低層大氣熱力混合的有效機制, 分別完成北半球中高緯和熱帶地區(qū)的低層熱力混合, 兩者共同作用消除不穩(wěn)定。垂直渦旋擴散與淺積云對流對低層大氣形成熱量傳輸?shù)幕パa匹配, 兩者分別實現(xiàn)陸面和海面低層大氣熱量的有效傳輸混合, 并共同構成下墊面邊界層和自由大氣間的有效垂直傳輸機制。淺對流活躍區(qū)處于強盛深厚對流區(qū)的下游方向, 大尺度層結降水有利于淺積云的發(fā)展。物理過程凈溫度調整是各過程調整平衡的結果, 除赤道南北兩側的熱帶地區(qū)存在兩個深厚的溫度調整柱外, 邊界層以上的整個對流層主體均以降溫為主, 而邊界層以下則以加熱為主。

Abstract:

30-year seasonal running was performed on AGCM PIAP3 and the temperature tendencies of its physical parameterizations were also systematically analyzed. Results showed that the net radiative effect was mainly cooling the air, and the temperature tendency of long wave radiation followed negative feedback relation with the temperature itself but positive one with cloudiness. The heating tendency of short wave radiation directly reflected the seasonal transition of the subsolar point. As the important heating mechnism of the atmosphere, both the deep convection and large scale precipitation were the main balance factors in counteracting the radiative cooling. The occurring regions of deep convection and large scale precipitation were separable, the former primarily heated the tropical deep air, and the later mainly heated the lower troposphere in mid-high latitude. The dry and moist adiabatic convections were the effective mechanisms in the thermal exchanging of lower air, both of which eliminated the instabilities in lower mid-high latitude in north hemisphere and in lower tropical air, respectively. Both vertical eddy diffusion and shallow convection were combined together to carry out the complementary thermal transmission for lower air and to realize the thermal blending of lower air over land surface and ocean surface, so that an effective vertical transmission mechanism between surface and free air was built. Shallow convection was generally located at the lee of deep convection and was reinforced by large scale precipitation. The net temperature tendency in physical parameterizations was achieved by the counteracting of each tendency, which cooled down the upper air above the boundary layer and made the air in the boundary layer warmer. Additionally, two deep temperature adjusting-columns appeared in both sides of equator.

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王麗瓊,左瑞亭,李崇銀,于坤.大氣環(huán)流模式PIAP3物理過程對溫度的調整關系分析.氣象科學,2015,35(3):279-288 WANG Liqiong, ZUO Ruiting, LI Chongyin, YU Kun. Analysis of physical parameterizations in PIAP3 on temperature tendency. Journal of the Meteorological Sciences,2015,35(3):279-288

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收稿日期:2013-10-09
最后修改日期:2013-10-20
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在線發(fā)布日期: 2015-07-03
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