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Seventeen models participating in the Coupled Model Intercomparison Project phase 5（CMIP5） activity are compared on their historical simulation of the South China Sea（SCS） ocean heat content（OHC） in the upper 300 m. Ishii＇s temperature data, based on the World Ocean Database 2005（WOD05） and World Ocean Atlas 2005（WOA05）, is used to assess the model performance by comparing the spatial patterns of seasonal OHC anomaly（OHCa） climatology, OHC climatology, monthly OHCa climatology, and interannual variability of OHCa. The spatial patterns in Ishii＇s data set show that the seasonal SCS OHCa climatology, both in winter and summer, is strongly affected by the wind stress and the current circulations in the SCS and its neighboring areas. However, the CMIP5 models present rather different spatial patterns and only a few models properly capture the dominant features in Ishii＇s pattern. Among them, GFDL-ESM2 G is of the best performance. The SCS OHC climatology in the upper 300 m varies greatly in different models. Most of them are much greater than those calculated from Ishii＇s data. However, the monthly OHCa climatology in each of the 17 CMIP5 models yields similar variation and magnitude as that in Ishii＇s. As for the interannual variability, the standard deviations of the OHCa time series in most of the models are somewhat larger than those in Ishii＇s. The correlation between the interannual time series of Ishii＇s OHCa and that from each of the 17 models is not satisfactory. Among them, BCC-CSM1.1 has the highest correlation to Ishii＇s, with a coefficient of about 0.6. 相似文献
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利用Argo浮标资料和Rama浮标资料对印度洋海洋环境数值预报系统2010-03-06—2013-05-31的24h混合层深度产品进行了预报精度检验。与Argo浮标数据对比表明:预报与观测绝对平均误差为13m,24h混合层深度预报平均偏浅10m以内;对苏门答腊岛附近海域(5°S~4°N,87°~99°E)的混合层深度预报平均偏浅20m,该海域预报平均风速偏小1.6m/s是可能原因;其它海域预报能力较高,尤其对热带中南印度洋区域(5°~17°S,63°~96°E)平均误差集中在-2~2m。分海域检验对比结果表明:该预报系统能很好的预测出阿拉伯海(60°~70°E,10°~20°N)和孟加拉湾(85°~93°E,10°~18°N)处混合层半年周期变化特征;热带南印度洋(60°~80°E,15°~19°S)混合层呈现明显季节变化特征,且在每年8,9月份达到最大值;热带外南印度洋(45°~70°E,0°~10°S)混合层常年较为浅薄;Argo与Rama数据所得结果一致;预报系统对上述特征均能很好地预测。 相似文献
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针对渤海及附近海区的曲折岸线变化以及水文资料时空分布不均匀性的特点,使用四维客观分析LOESS方法得到逐月气候态盐度场。结果表明:渤海南部沿岸水扩展和运移受季风影响显著。冬季沿岸水向渤海湾和莱州湾堆积,形成沿山东半岛龙口海岸东向爬行的水舌,该水舌在蓬莱水域向东扩展;夏季沿岸水向渤海中部冲溢,特别是在黄河口附近,其核心区厚度可达8 m,可扩展到119°30′E处,同时莱州湾内的沿岸水向湾内西部收缩。冬季渤海海峡呈现显著"北进南出"水交换态势;夏季渤海海峡定常流方式的水交换特征不明显。 相似文献
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在保证海岸带区域控制点均匀分布的基础上，对3景SPOT-5影像分别使用1：5万DEM和SRTM90m数据，开展6个、9个、12个控制点的影像正射校正。结果表明：在海岸带区域，基于传感器物理模型的1景SPOT-5影像正射校正，6个控制点即可保证较高的精度，控制点数量的增多对精度的提高并不显著；1：5万DEM比SRTM90m数据对影像的正射校正精度略高，但并不明显，在缺少1：5万DEM时，用SRTM90m数据代替亦能满足908课题的精度要求，进一步验证了SRTM90m数据在高分辨率遥感影像正射校正中的可用性。 相似文献