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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Estimation of net surface shortwave radiation over the tropical Indian Ocean using geostationary satellite observations: Algorithm and validation
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Estimation of net surface shortwave radiation over the tropical Indian Ocean using geostationary satellite observations: Algorithm and validation

机译：利用地球静止卫星观测估计热带印度洋上的净表面短波辐射：算法和验证

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摘要

This paper presents the development of a methodology to estimate the net surface shortwave radiation (SWR) over tropical oceans using half‐hourly geostationary satellite estimates of outgoing longwave radiation (OLR). The collocated data set of SWR measured at 13 buoy locations over the Indian Ocean and a Meteosat‐derived OLR for the period of 2002–2009 have been used to derive an empirical relationship. The information from the solar zenith angle that determines the amount of solar radiation received at a particular location is used to normalize the SWR to nadir observation in order to make the empirical relationship location independent. As the relationship between SWR and OLR is valid mostly over the warm‐pool regions, the present study restricts SWR estimation in the tropical Indian Ocean domain (30°E–110°E, 30°S–30°N). The SWR estimates are validated with an independent collocated data set and subsequently compared with the SWR estimates from the Global Energy and Water Cycle Experiment‐Surface Radiation Budget V3.0 (GEWEX‐SRB), International Satellite Cloud Climatology Project‐Flux Data (ISCCP‐FD), and National Centers for Environmental Prediction (NCEP) reanalysis for the year 2007. The present algorithm provides significantly better accuracy of SWR estimates, with a root‐mean‐square error of 27.3 W m~(-2) as compared with the values of 32.7, 37.5, and 59.6 W m~(-2) obtained from GEWEX‐SRB, ISCCP‐FD, and NCEP, respectively. The present algorithm also provides consistently better SWR compared with other available products under different sky conditions and seasons over Indian Ocean warm‐pool regions.
机译：本文介绍了一种方法的发展，该方法使用半小时对地静止卫星对长波辐射（OLR）的估计来估计热带海洋的净短波辐射（SWR）。利用印度洋上13个浮标位置和Meteosat衍生的OLR（2002-2009年）测得的SWR并置数据集来得出经验关系。来自太阳天顶角的信息（用于确定在特定位置处接收到的太阳辐射的量）用于将SWR标准化为最低点观测值，以使经验关系位置独立。由于SWR和OLR之间的关系主要在暖池地区有效，因此本研究限制了热带印度洋域（30°E–110°E，30°S–30°N）中的SWR估算。 SWR估算值通过一个独立的并置数据集进行验证，然后与全球能源和水循环实验-表面辐射预算V3.0（GEWEX-SRB），国际卫星云气候项目通量数据（ISCCP- FD），以及2007年国家环境预测中心（NCEP）的重新分析。本算法与SWR估计相比，SWR估计的准确性显着提高，均方根误差为27.3 W m〜（-2）。分别从GEWEX-SRB，ISCCP-FD和NCEP获得的32.7、37.5和59.6 W m〜（-2）W m〜（-2）。与印度洋暖池地区不同天空条件和季节的其他可用产品相比，本算法还提供了始终如一的更好的驻波比。

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