共查询到20条相似文献，搜索用时 212 毫秒
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东海试验区水体光谱特性现场测量与数据分析 总被引：6，自引：1，他引：5
星载水色遥感器 Ｓｅａ Ｗｉ Ｆ Ｓ 已业务化地为海洋学家提供高质量的海洋水色遥感数据。要有效地利用水色遥感数据,需要经常地对遥感器进行定标,并对测得的离水辐射率以及导出的生物—光学特性进行真实性检验。１９９８ 年５ 月, 我们在东海试验区,应用多光谱剖面／ 表面辐射仪（ Ｓ Ｐ Ｍ Ｒ／ Ｓ Ｍ Ｓ Ｒ） ,进行了光谱测量。本文介绍了现场测量的方法,以及根据我国海区的特点对实测数据的处理结果 相似文献
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浙江马鞍列岛附近海域浮游植物与赤潮生物研究 总被引：3，自引：1，他引：3
１９９０年５月和１１月在马鞍列岛附近海域进行两次采样调查，共检出浮游植物８０种，隶属于３６属。春季浮游植物的平均丰度为６．４×１０４个／ｍ３，最高达２０８．６×１０４个／ｍ３，优势种为夜光藻和角藻；秋季浮游植物平均丰度为７４４０．４×１０４个／ｍ３，最高达２０７６１．２×１０４个／ｍ３，优势种为中肋骨条藻，其丰度已达到赤潮发生的临界状态。由富营养化综合指数分析表明，５月该水域未处于富营养化，而１１月则完全处于富营养化状况。该水域春秋两季均存在多种赤潮生物。 相似文献
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１９９０年３月至１９９２年６月对南海大鹏湾盐田附近海域的夜光藻种群动态及时空分布进行了综合调查，发现夜光藻种群的出现期间一般是１－６月，数量高峰期为３－５月，种群密度的波动极为显著。调查期间共发生１０次赤潮，且都发生在３月初至５月初。大鹏湾诳光藻赤潮的发生特点是赤潮的发生和消失突然，持续时间短，一般不超过３ｄ。 相似文献
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改性膨润土对赤潮落种及海水中DRP,COD的去除效应 总被引：3，自引：0，他引：3
实验室研究了不同条件制备的改性膨润土对赤潮生物及海水中ＤＲＰ,ＣＯＤ的去除效应,结果表明,改性膨润土有效Ａｌ为１．５％时去除效应最好,经Ｎａ２ＳＯ４,Ａｌ２（ＳＯ４）３改性的膨润土在ｐＨ＝５．５时去除效应最佳,改性膨润土的去除效率随Ａｌ／ＳＯ４比值增加而增加,改性膨润土添加絮凝剂醋甲壳质和Ｃａ（ＯＨ）２提高了去除功效。 相似文献
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南海大鹏湾海洋褐胞藻赤潮及其成因 总被引：22，自引：5，他引：22
于１９９１年３月２０－２１日在大鹏湾首次发生海洋褐胞藻赤潮。对此分析了赤潮发生前后海洋环境因素的变化及其与赤潮的关系；以风速，气压，盐度，温度，磷酸盐，硝酸盐，铵盐，铁离子等８项指标为基础，改变参数组合，对采自１９９１年３－５月特定站位（Ｓｏ）的各样方进行聚类分析和比较。结果表明，在盐度为３１－３２和水温为２０℃的适宜条件下，铁离子和风速是形成本次赤潮的主要环境要素；大量营养盐尤其是硝酸盐度的增加 相似文献
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胶州湾营养盐的现状和变化 总被引：28，自引：3，他引：28
报道了１９９１年５月至１９９４年２月１２个航次胶州湾ＮＯ３－Ｎ，ＮＯ２－Ｎ，ＮＨ４－Ｎ，ＰＯ４－Ｐ和ＳｉＯ３－Ｓｉ的时空分布基本特征，６０年代于至９０年代的变化表明，胶州湾营养盐的浓度和分布已发生显变化。尤其从６０年代至８０年代，３０年来，胶州湾中东部水城ＰＯ４－Ｐ，ＮＯ３－Ｎ和ＮＨ４－Ｎ浓度分别增加２．２，７．３和７．１倍，ＴＯＮ浓度也增加了３．５倍，ＴＩＮ／ＰＯ４－Ｐ从１０增加至２４．２；Ｔ 相似文献
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Joji Ishizaka Yasuhisa Kitaura Yasuharu Touke Hiroaki Sasaki Akihiko Tanaka Hiroshi Murakami Toshikazu Suzuki Kazumi Matsuoka Hideaki Nakata 《Journal of Oceanography》2006,62(1):37-45
High resolution SeaWiFS data was used to detect red tide events that occurred in the Ariake Sound, Japan, a small embayment
known as one of the most productive areas in Japan. SeaWiFS chlorophyll data clearly showed that a large red tide event, which
damaged seaweed (Nori) cultures, started early in December 2000 in Isahaya Bay, expanded to the whole sound and persisted
to the end of February 2001. The monthly average of SeaWiFS data from May 1998 to December 2001 indicated that the chlorophyll
peaks appeared twice a year, in early summer and in fall, after the peaks of rain and river discharge. The SeaWiFS data showed
that the red tide event during 2000–2001 winter was part of the fall bloom; however, it started later and continued significantly
longer than other years. Satellite ocean color data is useful to detect the red tide; however the algorithms require improvement
to accurately estimate chlorophyll in highly turbid water and in red tide areas. 相似文献
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我国海区SeaWiFS资料大气校正 总被引：13，自引：1，他引：13
利用光谱辐射传输理论，结合海上同步实测资料，开发出我国海区SeaWiFS资料大气校正模型。经卫星资料处理结果比对，本模型在一类水体，基本消除了412nm和443nm波段离水辐射率小于0的现象；在二类水体，利用临近一类水体的大气条件进行了有效的大气校正；同时建立了670nm,765nm,865nm波段的大气校正模型，这三个面适用于高浓度悬浮泥沙的信息提取。本模型用于处理我国海区的SeaWiFS资料比美国NASA模型更适合我国海区特定的大气和海洋环境，为SeaWiFS资料海洋水色信息提取和我国海洋一号（HY－1）及风云一号（FY－1C）卫星资料的大气校正研究提供了技术基础。 相似文献
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The Changjiang (Yangtze) Estuary is located in the East China Sea shelf with shallow water. Affected by the tide mixing and the runoff of the Changjiang River and the Qiantang River, the turbidity is very high. Generally, the water-leaving radiance is high in the turbid water because of the large particle scattering. Based on the in-situ data and ocean color remote sensing data of SeaWiFS, it was found that there was a black water region with the normalized water-leaving radiances less than 0.5 mW/(cm2·μm2·... 相似文献
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Wataru Takahashi Hiroshi Kawamura Takuo Omura Ken Furuya 《Journal of Oceanography》2009,65(5):647-656
A multi-spectral classification scheme is proposed to identify water with red tide(s) using satellite ocean color imagery
obtained by the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). The study area was the eastern Seto Inland Sea in Japan,
where serious red tides frequently occur. “Background Ocean Colors” (BOCs hereafter), or colors of water around a red tide
or those of the water before/after a red tide, are calculated as the monthly climatological average of normalized water-leaving
radiances (nLw) with 0.01 degree spatial resolution with SeaWiFS imagery. Criteria for detecting red-tide pixels are established
from analyses of characteristics of the nLws (in the 443, 490, 510, and 555 nm bands) anomalies from BOCs and the nLw spectra
together with the red-tide records in Osaka Bay. The proposed scheme can efficiently indicate the presence or absence of red
tides for independent match-ups with 83% accuracy. Additional validations of specific events indicate that the algorithm performed
well in the study area. These results suggest that the scheme is appropriate to detect red tides in the optically complex
coastal water of the eastern Seto Inland Sea. 相似文献
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长江口海域处于东海大陆架,水深较浅,受长江、钱塘江入海径流及潮汐搅拌的影响,水体浑浊度高,属于典型的二类水体。在浑浊二类水体由于水体中悬浮颗粒的散射作用,离水辐亮度通常较大洋清洁水体的大。通过分析2003年春季黄海、东海二类水体光学试验数据和同时段SeaWiFS卫星遥感数据,发现在长江口东南海域有一个归一化离水辐亮度极小的黑水区域,它在412~670nm波长的归一化离水辐亮度均小于0.5mW/(cm2·μm·sr)。利用现场实测的水体固有光学特性参数(色素吸收系数、非色素颗粒吸收系数、黄色物质吸收系数、颗粒散射系数、颗粒后向散射系数等)和水色要素浓度数据,分析了长江口海域黑水现象的机制,结果表明,长江口外黑水现象主要是由于水体后向散射系数值极小引起的,而造成颗粒后向散射系数值极小的原因主要有两种,一是颗粒物含量低,二是颗粒后向散射率的值小。黑水区浮游植物色素吸收所占的比例较高,大粒径的有机颗粒(浮游植物)导致黑水区域的颗粒后向散射率的值偏小。长江口海域黑水是在特定的颗粒物低含量及颗粒后向散射率极小的条件下出现的光学现象。 相似文献
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Study on detection of coastal water environment of China by ocean color remote sensing 总被引：11，自引：1，他引：11
ＳＡＴＥＬＬＩＴＥＰＲＯＧＲＡＭＳＦＯＲＣＯＡＳＴＡＬＷＡＴＥＲＤＥＴＥＣＴＩＯＮＳｉｎｃｅｔｈｅ 1 980ｓ,ｇｒｅａｔａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏｔｈｅａｄｖａｎｃｅｄｒｅｍｏｔｅｓｅｎｓｉｎｇｔｅｃｈｎｉｑｕｅｉｎＣｈｉｎａ ,ｅｓｐｅｃｉａｌｌｙｔｏｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｓａｔｅｌｌｉｔｅｐｒｏｇｒａｍｓｆｏｒｃｏａｓｔａｌｗａｔｅｒｅｎｖｉｒｏｎｍｅｎｔ.Ｔｗｏｏｃｅａｎｃｏｌｏｒｃｈａｎｎｅｌｓａｄｄｅｄｔｏｔｈｅｆｉｒｓｔｒｅｍｏｔｅｓｅｎｓｉｎｇｓａｔｅｌｌｉｔ… 相似文献
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利用SeaDAS从SeaWiFS卫星数据反演中国东海叶绿素浓度 总被引：1，自引：0，他引：1
卫星海洋遥感反演海中叶绿素浓度,对海洋初级生产力估算及赤潮预报均有重要意义.本文介绍了SeaWiFS卫星传感器业务化算法OC4,利用SeaDAS软件反演中国东海叶绿素浓度,并与东海同步现场数据进行验证.结果表明:利用SeaDAS方法计算的东海叶绿素含量与实测含量之间具有较好的相关性,但总体上计算值要高于实际测量值;东海叶绿素含量具有分带性,河口、近岸海域高,中陆架次之,外陆架最低,这种发育特点与该海域的陆源营养盐输入、海洋动力系统有着显著的关系. 相似文献
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A practical algorithm of atmospheric correction for turbid coastal and inland waters is provided. The present algorithm uses the property that the water-leaving radiance at 412 nm increases very tittle with the increasing of water turbidity. Thus, in very turbid coastal and inland waters, the radiance at 412 nm can be used to estimate the aerosol scattering radiance at 865 nm. The performance of the new algorithm is validated with simulation for several cases. It is found that the retrieved remotely sensed reflectance is usually with error less than 10% for the first six bands of SeaWiFS. This new algorithm is also tested under various atmospheric conditions in the Changjiang River Estuary and the Hangzhou Bay where the sediment concentration is very high and the standard SeaWiFS atmospheric correction algorithm creates a mask due to atmospheric correction failure. The result proves the efficiency of this simple algorithm in reducing the errors of the water-leaving radiance retrieving using SeaWiFS satellite data. 相似文献