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CLOUD-AEROSOL INTERACTION AND ITS INFLUENCES ON THE SURFACE RADIATION BUDGETS IN EAST ASIA.

云-气溶胶相互作用及其对东亚表面辐射预算的影响。

基本信息

批准号：
16030215
负责人：
HAYASAKA Tadahiro
金额：
$ 2.56万
依托单位：
RESEARCH INSTITUTE FOR HUMANITY AND NATURE
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

In the present study, the comparison and analysis of surface shortwave irradiance over China were carried out by using pyranometer data, satellite-derived data, and parameterized data with meteorological factors. The new quality control method was developed to check the pyranometer data obtained for the past several decades. The application of the quality control method showed that the pyranometer data used in this study, which were obtained by the Chinese Meteorological Administration, were reliable for long-term trend analysis. The comparison of the pyranometer data with the satellite-derived data such as ISCCP-FD and GEWEX-SRB indicated systematic bias particularly in the urban and desert areas. It is suggested from radiative transfer calculations that the bias is ascribed to aerosols in the satellite-derived data even under the cloudy sky conditions.The surface shortwave irradiance pyranometer data analysis suggested a decreasing trend for the period 1960-1990. The decreasing trend may be ascribed to changes in optical thickness of aerosols and that of clouds while the cloud amount was decreasing in this period. It is also suggested that the surface shortwave irradiance appears to change from decrease to increase around 1990. It is consistent with the previous studies for the North America and Europe, that is, so-called "global dimming and brightening" phenomena. The study on this matter will be more important in the future climate studies.

利用总日射辐射计、卫星遥感资料和气象参数化资料，对我国地表短波辐射进行了对比分析。新的质量控制方法是为了检查过去几十年获得的日射强度计数据而开发的。质量控制方法的应用表明，在本研究中使用的总日射强度数据，这是由中国气象局获得的，是可靠的长期趋势分析。将日射强度计数据与ISCCP-FD和GEWEX-SRB等卫星数据进行比较表明，特别是在城市和沙漠地区存在系统偏差。辐射传输计算表明，即使在多云天空条件下，卫星数据中的偏差也归因于气溶胶。地面短波辐照度总日射计数据分析表明，1960-1990年期间呈下降趋势。这种减少的趋势可能是由于气溶胶光学厚度和云光学厚度的变化，而云量在此期间减少。此外，地表短波辐照度在1990年前后出现了由减少到增加的变化。这与以往对北美和欧洲的研究一致，即所谓的“全球变暗和变亮”现象。在未来的气候研究中，对这一问题的研究将更加重要。