CAJ | 학술논문

利用FY2C卫星和探空反演得到的云结构特征参数,结合地面降水,研究了云顶高度、光学厚度、云粒子有效半径和云厚度等云结构参数与降水的关系,并分类研究了层状云和对流云在不同降水强度情况下,云参数的频数分布规律及其与降水的关系。结果表明：通常云厚大于5km、云底较低、云粒子有效半径较大时,地面易出现降水,若云顶高于10km、云光学厚度大于20且云中无夹层或夹层稀薄时,地面雨强多大于1mm/h;对于层状云降水,当云光学厚度大于17时,地面出现降水的概率较大,随光学厚度值增加,地面雨强呈增大趋势;对于对流云降水,云顶高度和光学厚度相关性较好,云光学厚度大于17且云顶高于7km时,地面出现降水的概率较大,当光学厚度大于20时,地面雨强明显增大;层状云和对流云的降水概率均随云顶高度和光学厚度的增加而增大,降水概率与云光学厚度的相关性更为密切,光学厚度小于10的云很难产生降水,而云光学厚度大于20时,层状云和对流云的降水概率都会显著增加;综合云体的高度、厚度和云光学厚度等云参量的组合特征,对分析判断地面降水落区和降水强度更加有效。
이용FY2C위성화탐공반연득도적운결구특정삼수,결합지면강수,연구료운정고도、광학후도、운입자유효반경화운후도등운결구삼수여강수적관계,병분류연구료층상운화대류운재불동강수강도정황하,운삼수적빈수분포규률급기여강수적관계。결과표명：통상운후대우5km、운저교저、운입자유효반경교대시,지면역출현강수,약운정고우10km、운광학후도대우20차운중무협층혹협층희박시,지면우강다대우1mm/h;대우층상운강수,당운광학후도대우17시,지면출현강수적개솔교대,수광학후도치증가,지면우강정증대추세;대우대류운강수,운정고도화광학후도상관성교호,운광학후도대우17차운정고우7km시,지면출현강수적개솔교대,당광학후도대우20시,지면우강명현증대;층상운화대류운적강수개솔균수운정고도화광학후도적증가이증대,강수개솔여운광학후도적상관성경위밀절,광학후도소우10적운흔난산생강수,이운광학후도대우20시,층상운화대류운적강수개솔도회현저증가;종합운체적고도、후도화운광학후도등운삼량적조합특정,대분석판단지면강수락구화강수강도경가유효。
Based on the cloud structural characteristic parameters retrieved by FY2C satellite and radio sounding data,combined with precipitation on ground,the relationship between cloud parameters（ including cloud top height,optical thickness,particle effective radius,depth of cloud,etc） and precipitation was studied. The relationship between frequency distribution of cloud parameters and precipitation during stratiform cloud precipitation process and convective cloud precipitation process was researched further. Results show that precipitation is usually easy on the ground when cloud depth is thicker than 5 km,cloud base is low,and effective cloud particle radius is large. When cloud top height is greater than 10 km,optical thickness exceeds 20,and there is no or very thin interlayer in cloud,the surface precipitation intensity is usually more than 1 mm/h. For the stratiform cloud precipitation,if cloud optical thickness value exceeds 17,the probability of precipitation on ground will be higher. With the increase of optical thickness, surface rainfall intensity shows an increase tendency. For the convective cloud precipitation,there is a good correlation between cloud top height and optical thickness. While optical thickness value exceeds 17and cloud top is higher than 7 km,the probability of precipitation on the ground is greater. If the cloud optical thickness exceeds 20,surface precipitation intensity will increase significantly. Both the precipitation probability of stratiform cloud and convective cloud increases with cloud top height and optical thickness. The probability of precipitation is more related to optical thickness. Clouds of optical thickness value less than 10 are difficult to precipitate. If cloud optical thickness exceeds 20,precipitation probability of stratiform clouds and convective clouds will increase evidently. Comprehensive analysis of cloud top height, cloud thickness,optical thickness and other cloud parameters could be more effective to determine precipitation region and intensity on the ground.