Observation of chlorophyli-a distribution in the Suruga Bay using the underwater tow device-SCAN FISH

利用水下拖曳装置观测骏河湾叶绿素a分布-SCAN FISH

• 批准号: 11640434
• 负责人: OKADA Yoshihiro
• 金额: $ 1.6万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640434/
• 关键词: shlorophyll; the underwater tow device; remote sensing; Suruga Bay; the vertical distibution; クロロフィル分布; SeaWiFs画像; SeaWiFs画像データベース

Objective of our project was to develop appropriate methods to study phytoplankton distribution and spring bloom mechanism in the Suruga Bay as well as in open ocean waters off eastern Japan. We initially used the underwater tow device-SCAN FISH observation system (MACArtney A/S, Denmark) in the open ocean near Japan onboard RV BOSEI-MARU (1777t) of the Tokai University, to record vertical profile of temperature, salinity and chlorophyll-a fluorescence in the upper water column. Later we made necessary operational modification in the system to make it usable from smaller platforms such as fishing boats, in the Suruga Bay.Besides, we analyzed 3-year time series (1999-2001) of satellite derived ocean color and SST date respectively from Orb View2/Sea WiFS and NOAA/AVHRR to monitor spatial and temporal change in sea surface thermal field and its impact on near surface chlorophyll-a concentration in the Suruga Bay. We further developed empirical method to derive vertical profile of chlorop … More hyll a from the near surface pigment concentration for implementation on satellite data. For this purpose in situ water samples were collected during the cruises at surface and at different depths within 100m and chlorophyll a concentration was analyzed using HPLC technique.From the time series data it was noticed that beginning of the spring bloom in the Suruga Bay was delayed by one month during 2000 compared to 1999 and 2001. Our results based on different oceanographic and meteorological data in and around the Suruga Bay indicated that water column stratification started in the late-February in 1999 and 2001. However, during the late-February of 2000 such stratification got disrupted under strong influence of local wind creating deep mixed layer. Such condition did not allow phytoplankton to develop the spring bloom. Our results clearly indicated that vertical stratification is an important parameter in spring bloom phenomenon in the bay. We further used the SCAN FISH, to observe vertical profiles of different oceanographic parameters along with chlorohyll-a fluorescence to understand the mechanism of the bloom phenomenon. Vertical distribution of chlorophyll-a within upper 30m of the water column was noticed to be more strongly influenced by salinity profile than that of water temperature especially in the western sector of the bay. Strong relationship between vertical profile of salinity and chlorophyll-a underlines the importance of density stratification in the spring bloom phenomena in side the bay. This can be attrebuted to influx of plentiful freshwater into the bay from four major rivers along the western margin. Less

我们的项目的目的是开发适当的方法来研究浮游植物的分布和春季水华的机制，在骏河湾以及在日本东部外海沃茨。我们首先使用东海大学的BOSEI-MARU（1777 t）号考察船上的水下拖曳装置--SCAN FISH观测系统（MACAartney A/S，丹麦）在日本附近的公海上记录了上层水体的温度、盐度和叶绿素荧光的垂直剖面。后来，我们对系统进行了必要的操作修改，使其能够在骏河湾的渔船等较小平台上使用。此外，我们分析了三年的时间序列，（1999-2001）分别利用Orb View 2/Sea WiFS和NOAA/AVHRR卫星反演的海洋水色和SST数据，监测海表温度场的时空变化及其对近地表叶绿素的影响。骏河湾的一个集中地我们进一步发展了经验方法来推导叶绿素的垂直分布 ...更多信息 Hyll A来自近表面颜料浓度，用于在卫星数据上实施。为此目的，在现场采集水样在表面和在不同深度内100 m的巡航和叶绿素a浓度进行了分析，使用HPLC techniques.从时间序列数据中注意到，春季水华在骏河湾的开始推迟了一个月，在2000年相比，1999年和2001年。我们的研究结果的基础上不同的海洋和气象数据骏河湾及其周围地区表明，水柱分层开始于1999年和2001年2月下旬。然而，在2000年2月下旬，这种层化被破坏的强烈影响下，当地风创建深混合层。这样的条件不允许浮游植物发展春季水华。结果表明，垂直层结是春季水华现象的重要参数。我们进一步利用SCAN FISH技术，通过沿着叶绿素荧光观测不同海洋学参数的垂直剖面，了解水华现象的发生机制。叶绿素a的垂直分布在上30米的水柱被注意到更强烈的盐度剖面比水温的影响，特别是在海湾的西部部门。盐度和叶绿素a的垂直分布之间的密切关系强调了密度分层在湾边春季水华现象中的重要性。这可以归因于从沿着西部边缘的四条主要河流流入海湾的大量淡水。少

项目成果

Yoshihiro Okada: "A complementary Study on Spring Bloom Phenomena in the Waters off Sanriku Using Satellite and in situ Observation"Journal of The Marin Meteorological Society "UMI TO SORA (SEA AND SKY)". 75. 9-18 (1999)

冈田义宏：“利用卫星和现场观测对三陆海域春花现象进行补充研究”马林气象学会期刊《UMI TO SORA（SEA AND SKY）》。

Yoshihiro Okada: "Estimation of Vertical Profile of Chlorophyll Concentration around the Antarctic peninsula derived Satellite Image by the Statistical Method"Journal of The Marin Meteorological Society "UMI TO SORA (SEA AND SKY)". 76. 129-135 (1999)

Yoshihiro Okada：“通过统计方法估算南极半岛周围叶绿素浓度的垂直剖面衍生卫星图像”马林气象学会杂志“UMI TO SORA（SEA AND SKY）”。

Yoshihiro Okada: "Estimation of Vertical Profile of Chlorophyll Concentration around the Antarctic peninsula derived Satellite Image by the Statistical Method"Journal of The Marin Meteorological Society"UMI TO SORA(SEA AND SKY)". 76. 129-135 (1999)

Yoshihiro Okada：“通过统计方法估算南极半岛周围叶绿素浓度的垂直剖面衍生卫星图像”马林气象学会杂志“UMI TO SORA（SEA AND SKY）”。

Yoshihiro Okada: "A Complementary Study on Spring Bloom Phenomena in the Waters off Sanriku Using Satellite and in situ Observations"Journal of The Marin Meteorological Society "UMI TO SORA(SEA AND SKY)". 74. 9-18 (1999)

Yoshihiro Okada：“利用卫星和现场观测对三陆海域春花现象的补充研究”马林气象学会期刊“UMI TO SORA（SEA AND SKY）”。

Yoshihiro Okada: "Estimation of Vertical Profile of Chlorophyll Concentration around the Antarctic peninsula derived Satellite Image by the Statistical Method"Journal of The Marin Meteorological Society "UMI TO SOIRA(SEA AND SKY)". 76. 129-135 (1999)

Yoshihiro Okada：“通过统计方法估算南极半岛周围叶绿素浓度的垂直剖面衍生卫星图像”马林气象学会杂志“UMI TO SOIRA（SEA AND SKY）”。