陈琪,张华,荆现文,谢冰. 2017. 冰晶粒子不同形状假定对辐射收支和气候的影响[J]. 气象学报, ():-, doi:10.11676/qxxb2017.040
冰晶粒子不同形状假定对辐射收支和气候的影响
Effects of different ice crystal shape assumptions on radiation budget and climate
投稿时间:2016-12-08  最后修改时间:2017-01-16
DOI:10.11676/qxxb2017.040
中文关键词:  多形状,冰云,辐射收支,气候
英文关键词:Multi-shape,Ice cloud,Radiation budget,Climate
基金项目:国家自然基金(41375080)、科技部公益性行业(气象)科研专项课题(GYHY201406023)
作者单位E-mail
陈琪 中国气象科学研究院南京信息工程大学中国气象局气候研究开放实验室国家气候中心 chenqi1228@foxmail.com 
张华 中国气象局气候研究开放实验室国家气候中心南京信息工程大学气象灾害预报预警与评估协同创新中心 huazhang@cma.gov.cn 
荆现文 中国气象局气候研究开放实验室国家气候中心南京信息工程大学气象灾害预报预警与评估协同创新中心 jingxw@cma.gov.cn 
谢冰 中国气象局气候研究开放实验室,国家气候中心;南京信息工程大学,气象灾害预报预警与评估协同创新中心 bubba@126.com 
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中文摘要:
      将包含多形状冰晶粒子的冰云辐射参数化方案应用于全球气候模式中,详细讨论了冰云粒子从球形假定到多形状假定的变化对辐射场和气候场的影响。结果显示,冰晶粒子形状假定的引入对冰云光学厚度、辐射通量和加热率以及温度场均有明显的影响。采用新的冰云方案使得全球平均云光学厚度值降低0.28(23%);热带地区降低最为明显,其差异绝对值可达1.02,而在中高纬度陆地地区,两者的冰云光学厚度差别较小。冰晶粒子形状假定改变将导致全球平均的大气顶出射长波辐射通量增加5.52W/m2(2.3%)。与观测资料的比较表明,多形状冰晶粒子假定明显减小了球形粒子假定对长波出射辐射的低估。对大气加热率廓线的模拟显示,多形状冰晶粒子假定会减弱短波辐射对大气的加热作用,同时增强长波辐射对大气的冷却作用;在热带对流层中高层,这两种影响尤为显著。冰晶粒子形状假定的改变对温度场有明显的影响,热带地区的对流层高层大气温度降低幅度可达1.5 K以上。研究表明,冰晶粒子形状假定的改变对模拟的辐射和温度场均有重要的影响。
英文摘要:
      With a multi-shape ice cloud radiative parameterization scheme applied in the global climate model, the changes of radiation fields and climate fields between the spherical ice crystal assumption and the multi-shape ice crystal assumption are discussed in detail. The results showed that the influences on ice cloud optical depth, radiative fluxes, heating rates and temperature were obvious caused by ice crystal shape assumption. Compared with the spherical ice crystal assumption, the global average ice cloud optical depth decreased 0.28 (23%), and the tropical area decreased obviously, with the absolute value of up to 1.02, while land areas in middle and high latitudes changed very little. The global average upward longwave radiation flux at the TOA increased 5.52W/m2 (2.3%). Compared with the observation, the multi-shape ice crystal assumption significantly reduced the underestimate of spherical ice crystal assumption. To heating rate profiles, the multi-shape ice crystal assumption weakened the shortwave radiation heating effect on the atmosphere, while enhanced the longwave radiation cooling effect on the atmosphere, and these two effects are particularly significant in the tropical upper troposphere. The change of ice crystal shapes had a significant effect on the temperature field, and the temperature in the tropical upper troposphere decreased more than 1.5 K. In summary, the change of ice crystal shape assumption has an important influence on the simulated radiation field and temperature field.
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