IPCC DDC AR4 UKMO-HadCM3 SRESB1 run1

These data represent monthly averaged values of selected variables for the Data Distribution Centre (DDC) of the Intergovernmental Panel on Climate Change (IPCC). (see also https://www.ipcc-data.org/)

The model output prepared for IPCC Fourth Assessment SRES B1 experiment.

These datasets are available in netCDF and GRIB format.

For this experiment there is only one run available.
Includes indirect and direct sulphate aerosol effects from 2000. The N2O concentrations were calculated using a fixed lifetime. CH4 and H(C)FCs (HCFC22 HFC125 HFC134A) were calculated using the 2D atmospheric chemistry model and no climate change. Other H(C)FCs have forcings of O(0.01-0.1) W m-2 but we did not include them in other SRES scenarios either. CFCs (CFC11 CFC12 CFC113) were assumed to be the same as in SRES A2 because they are controlled by the Montreal Protocol so should be identical in all scenarios. Tropospheric ozone was calculated using STOCHEM with surface emissions of NOx etc from the SRES web site converted to 5x5 degrees and no climate change. Fields were calculated in single-year runs (with 3-month spinup) for 1990 2030 2060 2099. Stratospheric ozone was calculated using the same Cl and Br concentrations as in other SRES scenarios.

Model output data for CMIP3 in higher temporal resolutions and further variables are available in ESGF at https://esgf-node.llnl.gov/search/cmip3/.

本数据集展现了政府间气候变化专门委员会（IPCC）数据分布中心（DDC）所选取变量的月度平均数值。（参见 https://www.ipcc-data.org/）模型输出是为 IPCC 第四次评估报告中的 SRES B1 实验准备的。这些数据集以 netCDF 和 GRIB 格式提供。针对本实验，仅有一个运行结果可用。数据集包含自2000年起间接和直接硫酸盐气溶胶效应。氮氧化物浓度采用固定寿命进行计算。甲烷及氢氯氟烃（HCFC22、HFC125、HFC134A）通过二维大气化学模型计算，并假设无气候变化。其他氢氯氟烃具有 O(0.01-0.1) W m-2 的强迫力，但未在其他 SRES 情景中包含。氯氟烃（CFC11、CFC12、CFC113）假定与 SRES A2 相同，因为它们受蒙特利尔议定书控制，因此在所有情景中应保持一致。对流层臭氧通过 STOCHEM 计算，将 SRES 网站上的表面排放物（如 NOx 等）转换为 5x5 度网格，并假设无气候变化。字段计算在单年运行中进行（含3个月启动期），时间跨度为1990年、2030年、2060年、2099年。平流层臭氧的计算使用了与其他 SRES 情景相同的 Cl 和 Br 浓度。CMIP3 模型的高时间分辨率数据以及更多变量可在 ESGF（https://esgf-node.llnl.gov/search/cmip3/）获取。