CAJ | 학술논문

对云量的诊断方案作了深入的分析,证明了无论云量与其他变量的关系是离散型还是连续型,只要云量与其他变量的关系是由凸函数描述的,则云量会系统性地偏少;反之,如果云量与其他变量的关系是由凹函数来描述的,则云量会系统性地偏大.故Slingo型云量方案中,大尺度云量会系统性偏少,而积云对流所对应的云量会系统性地偏大.同时还证明了如果其他气象变量是高频振荡型的,则云量与该气象变量的关系在局地相关较好,而长期时间平均后则相关程度急剧下降;如果其他气象变量是稳定型变量,则云量与该气象变量的关系在局地相关长期平均好,但就短时间而言相关较差.故云量方案(含Slingo型)存在系统性误差,应被新的物理上更合理的方案所代替.
대운량적진단방안작료심입적분석,증명료무론운량여기타변량적관계시리산형환시련속형,지요운량여기타변량적관계시유철함수묘술적,칙운량회계통성지편소;반지,여과운량여기타변량적관계시유요함수래묘술적,칙운량회계통성지편대.고Slingo형운량방안중,대척도운량회계통성편소,이적운대류소대응적운량회계통성지편대.동시환증명료여과기타기상변량시고빈진탕형적,칙운량여해기상변량적관계재국지상관교호,이장기시간평균후칙상관정도급극하강;여과기타기상변량시은정형변량,칙운량여해기상변량적관계재국지상관장기평균호,단취단시간이언상관교차.고운량방안(함Slingo형)존재계통성오차,응피신적물리상경합리적방안소대체.
The diagnosis scheme of cloud cover is analyzed deeply. No matter how the relationship between cloud cover and other variables is, the discrete or continuous type,the conclusion is the same, that is, the simulated cloud cover will be systematically less than the actual value if their relationship is described by the convex function, and the simulated cloud cover will be systematically more than the actual value if their relationship is described by the concave function. Therefore, in the case of Slingo cloud cover scheme, large-scale cloud cover will be systematically less than the actual cloud cover, and in the case of cumulus convection, the corresponding cloud cover will be more than the actual cloud cover. It is also showed that the relationship between the cloud cover and this meteorological variable has high correlation locally and the degree of correlation declines sharply after long-time average if the other variables are the high frequency oscillation type. And the relationship between the cloud cover and this meteorological variable has high correlation locally after long-time average but low correlation after short-time average if the other variables are the stable type. Thus, there are systematical errors about the cloud cover scheme,including Slingo scheme, and it is expected that the existing schemes should be replaced by a new scheme which is more reasonable on physics.