Support for the Radiation-Intercomparison Project as part of the Chemistry Climate Model Validation exercise (CCMVal)

支持辐射比对项目，作为化学气候模型验证活动 (CCMVal) 的一部分

基本信息

批准号：
NE/E010164/1
负责人：
Piers Forster
金额：
$ 6.21万
依托单位：
University of Leeds
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2007
资助国家：
英国
起止时间：
2007 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FE010164%2F1
关键词：
Support Radiation Intercomparison Project part

项目摘要

Uncertainties in radiation schemes are a large source of error in climate studies. The PI is leading an international effort to validate the radiative transfer models used in Chemistry Climate Models (CCMs). This project is part of the SPARC CCM Validation (CCMVal) exercise. SPARC/WCRP recognise that CCMs require extensive validation and are providing the framework but not the funding to carry out this project. Phase I of this project is nearing completion and this NERC Small Grant proposal is to support Phases II and III of the project. Phase I. For this the PI collected and/or created (by stripping radiation subroutines out of main programs) offline versions of five GCM and CCM radiative transfer codes. Single profile clear sky comparisons of radiative heating rates and forcings were made and these were compared to those calculated with a sophisticated radiation model). This approach required substantial coding and debugging to get all radiation schemes performing on a single computer platform. Phase II will widen the comparison to the international CCM community and involve many more radiation schemes (12+), compared to the 5 analysed in Phase I. Groups themselves will need to perform the requested offline calculations. Heating rates, radiative temperature changes and radiative relaxation times will be compared in offline radiative transfer schemes for multiple clear-sky atmospheric profiles, simulating different months and different times of day. To explain the differences found between schemes it is also important to document the various parameterisations and approximations used in each code. Therefore it is necessary for the PI to visit modelling groups for a few days, impress on them the need for action and then to enlist willing scientists to help produce and/or document an offline radiation code. Following on from this contact groups will be required to submit calculations in a timely fashion and help with interpretation of the results. A suite of requested documentation and calculations has already been designed. Discovering causes of radiation scheme error will be an iterative process with the modelling groups performing additional calculations when requested. An independent set of reference calculations are also being performed by Dr Robert Portmann (NOAA-Bolder). Phase III will involve the CCM groups themselves with our input, employing the results from Phase II to improve their radiative transfer schemes and look at how improved schemes affect CCM integrations.

辐射方案的不确定性是气候研究中的误差源。 PI正在领导国际努力，以验证化学气候模型（CCM）中使用的辐射转移模型。该项目是SPARC CCM验证（CCMVAL）练习的一部分。 SPARC/WCRP认识到CCM需要广泛的验证，并提供了框架，但没有提供该项目的资金。该项目的第一阶段即将完成，这项NERC小赠款提案是支持该项目的II和III阶段。第一阶段。为此，在五个GCM和CCM辐射传输代码的脱机版本中收集和/或创建（通过从主要程序中剥离辐射子例程）。进行了辐射加热速率和强迫的单一剖面清晰的天空比较，并将其与用复杂的辐射模型计算的单一比较进行了比较。这种方法需要大量的编码和调试才能使所有辐射方案在单个计算机平台上执行。第二阶段将扩大与国际CCM社区的比较，并涉及更多的辐射方案（12+），与第一阶段分析的5个分析相比，组本身将需要执行所需的离线计算。在离线辐射转移方案中，将比较多个透明的大气轮廓的加热速率，辐射温度变化和辐射放松时间，从而模拟了不同的月份和不同时间。为了解释方案之间发现的差异，记录每个代码中使用的各种参数和近似值也很重要。因此，PI有必要访问建模小组几天，对他们印象深刻的行动需要，然后邀请愿意的科学家帮助制作和/或记录离线辐射法规。紧随其后，将要求及时提交计算，并有助于解释结果。已经设计了一套请求的文档和计算。发现辐射方案误差的原因将是一个迭代过程，在要求时建模组执行其他计算。 Robert Portmann博士（NOAA-BOLDER）也进行了独立的参考计算集。第三阶段将涉及CCM组本身，采用II阶段的结果来改善其辐射转移方案，并研究改进方案如何影响CCM整合。