鲐鱼灯光围网渔船水上集鱼灯水中照度分布及优化配置的理论计算   总被引：2，自引：0，他引：2  

沙锋  钱卫国  吴仲琪  陈幸骏 《海洋学研究》2013,31(1):85-90

采用叠加法照度计算模式,根据一组鲐鱼灯光围网渔船中3艘不同渔船的水上集鱼灯布置参数,使用自行开发的水上集鱼灯水下光场计算系统,对各船的水中照度分布进行了计算,获得船舷右侧中部水深方向200 m范围内不同深度的照度,并使用Surfer 8.0软件绘制等值曲线图,结果表明:主灯船在总功率为180 kW的情况下,10 lx的等照度曲线水平方向最远在56 m左右,水深方向不超过20 m;离船水平距离40 m、垂直距离40 m处的照度约为0.01 lx。副灯船在总功率为120 kW的情况下,10 lx的等照度曲线水平方向最远在46 m左右,水深方向不超过18 m;离船水平距离33 m、垂直距离38 m处的照度约为0.01 lx。网船在总功率为40 kW的情况下,10 lx的等照度曲线水平方向最远在45 m左右,水深方向不超过15 m;离船水平距离30 m、垂直距离35 m处的照度为0.01 lx左右。从集鱼灯的配置情况来看,主灯船、副灯船与网船目前的配置均较好,但主灯船在灯距增大到0.26 m、灯高增大到5 m时可增加1.6%的有效水体体积,副灯船在灯距减少到0.28 m、灯高增大到5 m时可增加2.1%的有效水体体积,网船在灯距增大到0.64 m、灯高增大到9 m时可增加1.7%的有效水体体积。计算结果还表明,大幅度的增加光诱渔船的集鱼灯功率并不能很有效的提高该船的光诱范围。  相似文献   

Fengyun-4 Geostationary Satellite-Based Solar Energy Nowcasting System and Its Application in North China     

Chunlin HUANG  Hongrong SHI  Ling GAO  Mengqi LIU  Qixiang CHEN  Disong FU  Shu WANG  Yuan YUAN  Xiang′ao XIA 《大气科学进展》2022,39(8):1316-1328

Surface solar irradiance (SSI) nowcasting (0–3 h) is an effective way to overcome the intermittency of solar energy and to ensure the safe operation of grid-connected solar power plants. In this study, an SSI estimate and nowcasting system was established using the near-infrared channel of Fengyun-4A (FY-4A) geostationary satellite. The system is composed of two key components: The first is a hybrid SSI estimation method combining a physical clear-sky model and an empirical cloudy-sky model. The second component is the SSI nowcasting model, the core of which is the derivation of the cloud motion vector (CMV) using the block-matching method. The goal of simultaneous estimation and nowcasting of global horizontal irradiance (GHI) and direct normal irradiance (DNI) is fulfilled. The system was evaluated under different sky conditions using SSI measurements at Xianghe, a radiation station in the North China Plain. The results show that the accuracy of GHI estimation is higher than that of DNI estimation, with a normalized root-mean-square error (nRMSE) of 22.4% relative to 45.4%. The nRMSE of forecasting GHI and DNI at 30–180 min ahead varied within 25.1%–30.8% and 48.1%–53.4%, respectively. The discrepancy of SSI estimation depends on cloud occurrence frequency and shows a seasonal pattern, being lower in spring–summer and higher in autumn–winter. The FY-4A has great potential in supporting SSI nowcasting, which promotes the development of photovoltaic energy and the reduction of carbon emissions in China. The system can be improved further if calibration of the empirical method is improved.  相似文献   

Periodic exposure to ambient solar irradiance benefits the growth of juvenile seedlings of Hizikia fusiformis     

单体锋  逄少军  高素芹 《中国海洋湖沼学报》2011,(5)

In our trials, from 2007 to 2008, of mass production of seedlings of Hizikia fusiformis using synchronization techniques, problems of a dark thalli phenomenon and epiphytes contamination severely threatened the health of juvenile seedlings. In this investigation, we optimized conditions for improving the growth of juvenile seedlings. Seven string collectors were seeded with zygotes and a series of experiments were conducted including direct exposure to solar irradiance, co-culture with Ulva spp. and treatme...  相似文献   

Advances in the Research of Impact of Decadal Solar Cycle on Modern Climate     

Xiao Ziniu  Zhong Qi  Yin Zhiqiang  Zhou Limin  Song Yan  Han Yanben  Huang Cong  Pan Jing  Zhao Liang 《地球科学进展》2013,28(12):1335-1348

Role of solar activity on modern climate change, particularly in the decadal scale is an important scientific issue. This paper reviews the recent observation of decadal solar signal in earth’s climate, with focus on the mechanism of solar radiation, ultraviolet radiation and cosmic rays on climate system ,and its validation. The paper points out that the assessment of uncertainty in observations, amplification process of the climate system, as well as possible future impact of solar extreme events are challenges in the present study. Finally, the keys of breakthrough are pointed, to provide a reference for future research.  相似文献   

Case studies of spectral atmospheric transmittance in the ultraviolet and visible regions in Athens, Greece: I. Total transmittance     

H. D. Kambezidis  A. D. Adamopoulos  D. Zevgolis   《Atmospheric Research》2000,54(4)

This work accounts for an investigation about the diurnal variation of total spectral transmittance of solar irradiance under dominant wind conditions as case studies. Such a work is carried out in Athens for the first time. The spectral transmittance values estimated were derived using ground-based spectral measurements of beam irradiance in the range 310–575 nm (UV and VIS). The data were recorded by a system consisting of an automatic solar tracker and a spectrometer. All data were recorded under clear-sky conditions in the city center of Athens and the spectral total atmospheric transmittance was estimated towards zenith to avoid optical mass effects. The comparison reveals that the total atmospheric transmittance is higher under the influence of strong Etesian compared to sea-breeze conditions. The influence of low-pressure systems also plays a depollution role in the basin. Various features of diurnal variation are discussed with respect to emission sources, topographic peculiarities and wind pattern.  相似文献   

大黑子群对太阳总辐照度的影响     

李治凯  吴铭蟾  奕蒂 《天文研究与技术》1996,(4)

本文用云南天文台在第２２周太阳活动峰年期间拍摄到的大太阳黑子群照相资料，太阳黑子目视描述资料，以及Ｎｉｍｂｕｓ—７卫星上辐射计测量的太阳总辐照度，分别计算了太阳总辐射照度与大黑子群的本影视面积，大黑子群全群视面积和日面上全部黑子的总视面积的相关系数。结果表明，太阳总辐射照度与这三种视面积均存在强的负相关。其中与大黑子群本影视面积的相关最强，其次是与全群视面积的相关，最后是与日面上全部黑子的总视面积的相关。并对以上结果和其它有关结果进行了分析和讨论。  相似文献   

月球辐射照度模型比对及地基对月观测验证     

张璐  张鹏  胡秀清  陈林  王阳  王威 《遥感学报》2017,21(6):864-870

月球是除太阳外对地张角最大的天体,反射率稳定性为10–8每年,适合用于遥感卫星的辐射定标、夜间地基大气遥感和夜间卫星遥感,但月球辐射照度模型的精度束缚了上述应用的发展。为检验现有ROLO(RObotic Lunar Observatory)和MT2009(Miller-Turner 2009)地基整盘月球辐射照度模型的精度,国家卫星气象中心于2015年底至2016年初在云南丽江组织了3个月的地基对月观测,使用高光谱月球成像光谱仪获取了399.00—1060.00 nm连续光谱的月球辐射照度。基于整盘月球辐射照度模型,利用丽江地基对月观测试验资料,对比模型与模型、模型与丽江地基观测月球辐射照度。结果表明:(1)MT2009与ROLO模型在短波红外谱段的差异明显大于可见光谱段;(2)地基观测高光谱月球辐射照度结果与ROLO模型更接近,但是可见光波段比ROLO模型辐射照度平均小5.86%左右。为探究差异产生的主要来源,对结果还进行了进一步的分析和讨论,以期为今后月球辐射模型的改进和夜间微光遥感研究提供经验和依据。  相似文献   

Transformation of Irradiance Measurements into Spectral Actinic Flux for Photolysis Rates Determination     

HÉLÈNE COTTE  CLAUDE DEVAUX  PATRICK CARLIER 《Journal of Atmospheric Chemistry》1997,26(1):1-28

The actinic flux is the only radiometric quantity suitable for photolysisfrequency determination. It is derived from solar spectral irradiancemeasurements performed by a portable spectroradiometer in the 300–850nm wavelength range. The spectral irradiance is first divided into a directpart and a diffuse part, according to the atmospheric conditions, and thenconverted into the corresponding actinic flux quantity. As an intermediary,the ratio of diffuse actinic flux to diffuseirradiance is calculated by the spherical harmonics radiative code withrespect to wavelength, solar zenith angle, surface albedo, and aerosolproperties.The results of extensive sensitivity studies of asa function of the main atmospheric parameters are discussed and lead to theconclusion that aerosol optical depth is the major critical value for aprecise determination. The global algorithm totransform spectral irradiance into actinic flux is finally applied forphotodissociation rate calculations by convolution of the obtained actinicflux spectra with the absorption cross-sections and quantum yields of themolecule studied. Photolysis rates of different atmospheric photooxidants havebeen measured with this spectroradiometric method during the summers of 1993and 1994 in Brittany and in Portugal. The ozone and nitrogen dioxidephotodissociation rates obtained present a good agreement with thej(O₃) and j(NO₂) actinometerresults, for the same experimental conditions in Brittany.  相似文献   

Reconstruction and prediction of the total solar irradiance: From the Medieval Warm Period to the 21st century     

《New Astronomy》2015

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珠海一号高光谱传感器波段平均太阳辐照度计算     

高磊 《北京测绘》2020,(5):593-595

传感器波段平均太阳辐照度是计算表观反射率等辐射参量的必要参数,是开展定量遥感分析的重要基础。通过中国气象局发布的零大气条件下太阳光谱辐照度数据和遥感数据运营商提供的珠海一号高光谱传感器光谱响应函数资料,计算了珠海一号三颗高光谱卫星上三组传感器的波段平均太阳辐照度。以中国资源卫星应用中心发布的高分一号资料为参考,确定结果具有较高的准确度,可为珠海一号高光谱数据的推广和使用提供参考。  相似文献