Zooplankton counts for bongo net hauls in the Gulf of Alaska from F/V Great Pacific GP0401-01, GP0401-02 from October to November 2004 (NEP project)

DataONE2026-04-06 更新2026-05-19 收录

下载链接：

https://search.dataone.org/view/sha256:3f2e2cceb447815975702597a3e4901fa7ab94d2326fba14605d6709738b25f6

下载链接

链接失效反馈

官方服务：

资源简介：

Gulf of Alaska Bongo catch data Zooplankton counts for bongo net hauls in the Gulf of Alaska during 2004. <a href=\"http://www.ims.uaf.edu/GLOBEC/\" target=\"blank\">Marine Ecosystem Monitoring in the Northern Gulf of Alaska </a>web site <a href=\"http://www.ims.uaf.edu/gak1/\" target=\"blank\">GAK1 Time Series</a> web site This project is to conduct the Gulf of Alaska Long-Term Observation Program (GOA-LTOP) as part of Phase II of the Northeast Pacific (NEP) GLOBEC program. The GOA shelf supports a rich ecosystem that includes many commercially important fisheries. The basis for this productivity is enigmatic for the GOA shelf is deep, forced by downwelling-favorable winds, and fed by a massive nutrient-poor coastal freshwater discharge. Both the winds and the freshwater discharge are intimately linked to the strength and position of the Aleutian Low. The GOA ecosystem experiences substantial physical and biological changes on decadal and interannual time scales. Although some of these changes are correlated with various climatic indices a mechanistic understanding of climate change and ecosystem response is unavailable. The generic goal of this LTOP is to understand and quantify temporal (seasonal and interannual) and spatial (cross- and along-shelf) variations in the thermohaline, chemical, and biological properties and relationships of this shelf. Our proposal supports GLOBEC goals that will help: 1) retrospective studies interpret historical data, 2) design a cost-effective long-term monitoring program, 3) provide the seasonal and interannual context for concurrent mesoscale and process studies, and 4) provide boundary conditions and data sets for model evaluation. This 5-year project entails 4 field years and a fifth year for data analyses and synthesis. The field effort involves seven, 9-day interdisciplinary cruises/year in the northern GOA. The study area encompasses the 220-km long, Seward Line (sampled in the 1970s) that extends across the shelf and slope and high resolution sampling of the Alaska Coastal Current (ACC), upstream, downstream, and within Prince William Sound. The ACC is an important shelf habitat for yoy salmon migrating from nursery areas in the sound and into the GOA. The sampling effort (Table A) is year-round and motivated by seasonally significant physical and biological events affecting yoy pink salmon. Table A. Sampling schedule and rationale for GOA-LTOP. (Key for Winds, Discharge and Stratification: S=strong; M=moderate; W=weak; D=downwelling winds; U=upwelling winds; V=variable; L=low; H=high) Deep water moves onshore during the July-August upwelling period. <table border=\"1\"> <tbody> <tr> <th colspan=\"1\" rowspan=\"2\">Month</th> <th colspan=\"4\" rowspan=\"1\">Sampling</th> <th colspan=\"3\" rowspan=\"1\">Physical Rationale</th> <th colspan=\"1\" rowspan=\"2\">Biological Rationale</th> </tr> <tr> <td>CTD</td> <td>Nutrients</td> <td>Zoo</td> <td>Fish</td> <td>Winds</td> <td>Disch</td> <td>Strat</td> </tr> <tr> <td>March</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>D S</td> <td>L</td> <td>W</td> <td>Zooplankton migrate from depth (at shelfbreak); transported inshore.</td> </tr> <tr> <td>April</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>D M</td> <td>L-M</td> <td>W V</td> <td>Phytoplankton bloom</td> </tr> <tr> <td>May</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>D M-W</td> <td>M</td> <td>M V</td> <td>Maximum oceanic copepod biomass.</td> </tr> <tr> <td>July</td> <td>X</td> <td>X</td> <td>X</td> <td>X</td> <td>D/U W</td> <td>M-H</td> <td>S</td> <td>Maximum zooplankton abundance; YOY salmon enter shelf.</td> </tr> <tr> <td>August</td> <td>X</td> <td>X</td> <td>X</td> <td>X</td> <td>D/U W</td> <td>M-H</td> <td>S</td> <td>Maximum YOY salmon abundance on shelf.</td> </tr> <tr> <td>October</td> <td>X</td> <td>X</td> <td>X</td> <td>X</td> <td>D S</td> <td>H</td> <td>H</td> <td>YOY salmon on shelf.</td> </tr> <tr> <td>December</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>D S</td> <td>M</td> <td>M</td> <td>Fall-winter pre-conditioning for spring nutrients, small zooplankton.</td> </tr> </tbody> </table>   The sampling protocol follows GLOBEC guidelines and uses gear types and techniques similar to those in the Oregon LTOP that is also a part of the NEP-GLOBEC program. Most of the research will be conducted from the R/V Alpha Helix. Fish sampling will be done from a chartered trawler in July, August, and October. Both vessels will work together during these cruises so that the fishing charter can verify fish targets detected on the acoustics array towed from the Alpha Helix. This page was last updated on September 22, 2000. Maintained by: <a href=\"mailto:hbatchelder@coas.oregonstate.edu\">Hal Batchelder [hbatchelder@coas.oregonstate.edu</a> College of Oceanic & Atmospheric Sciences Oregon State University Corvallis, OR 97331-5503 phone: 541-737-4500; FAX 541-737-2064

阿拉斯加湾邦戈网采样数据集本数据集包含2004年于阿拉斯加湾开展的邦戈网拖网采样的浮游动物计数结果。<a href="http://www.ims.uaf.edu/GLOBEC/" target="_blank">阿拉斯加湾北部海洋生态系统监测</a>网站<a href="http://www.ims.uaf.edu/gak1/" target="_blank">GAK1时间序列</a>网站本项目为东北太平洋（Northeast Pacific, NEP）全球海洋生态系统动力学研究计划（GLOBEC）第二阶段的组成部分，旨在实施阿拉斯加湾长期观测计划（Gulf of Alaska Long-Term Observation Program, GOA-LTOP）。阿拉斯加湾陆架拥有丰富的生态系统，孕育了众多具有商业价值的渔业资源。该陆架的高生产力成因至今成谜：其海域水体深邃，受有利于下沉的风力驱动，且受大量营养匮乏的沿岸淡水径流补给。风力与淡水径流均与阿留申低压的强度和位置密切相关。阿拉斯加湾生态系统在年代际和年际尺度上会发生显著的物理与生物变化。尽管部分变化与多种气候指数存在相关性，但目前尚未形成关于气候变化与生态系统响应的机制性认知。本长期观测计划的总体目标是，理解并量化该陆架区域温盐、化学及生物属性及其相互关系的时间（季节与年际）与空间（跨陆架与沿陆架）变化特征。本项目方案契合GLOBEC的研究目标，具体可助力以下工作：1）通过回顾性研究解读历史观测数据；2）设计兼具成本效益的长期监测方案；3）为同步开展的中尺度与过程研究提供季节与年际尺度的背景参考；4）为模式评估提供边界条件与数据集。本项目为期5年，包含4个野外作业年度与1个数据分析与综合研究年度。野外作业每年将在阿拉斯加湾北部开展7次为期9天的多学科科考航次。研究区域涵盖横跨陆架与陆坡的220千米长斯沃德线（Seward Line，20世纪70年代即开展采样），以及阿拉斯加沿岸流（Alaska Coastal Current, ACC）的上游、下游与威廉王子湾内部的高分辨率采样区域。阿拉斯加沿岸流是当年幼鲑鱼从威廉王子湾育苗场向阿拉斯加湾洄游的重要陆架栖息生境。本次采样（见表A）全年开展，其设计依据为影响当年幼粉鲑的季节性显著物理与生物事件。表A. 阿拉斯加湾长期观测计划（GOA-LTOP）采样计划与依据。（风况、径流与层化说明：S=强；M=中等；W=弱；D=下沉风；U=上升风；V=多变；L=低；H=高）7-8月上升流时段，深层水会上涌至近岸区域。<table border="1"><tbody><tr><th colspan="1" rowspan="2">月份</th><th colspan="4" rowspan="1">采样项目</th><th colspan="3" rowspan="1">物理依据</th><th colspan="1" rowspan="2">生物依据</th></tr><tr><td>CTD温盐深采样</td><td>营养盐采样</td><td>浮游动物采样</td><td>鱼类采样</td><td>风况</td><td>径流</td><td>层化程度</td></tr><tr><td>3月</td><td>X</td><td>X</td><td>X</td><td> </td><td>D S</td><td>L</td><td>W</td><td>浮游动物从陆坡深处迁移，并被输送至近岸区域。</td></tr><tr><td>4月</td><td>X</td><td>X</td><td>X</td><td> </td><td>D M</td><td>L-M</td><td>W V</td><td>浮游植物水华</td></tr><tr><td>5月</td><td>X</td><td>X</td><td>X</td><td> </td><td>D M-W</td><td>M</td><td>M V</td><td>大洋桡足类生物量达到峰值。</td></tr><tr><td>7月</td><td>X</td><td>X</td><td>X</td><td>X</td><td>D/U W</td><td>M-H</td><td>S</td><td>浮游动物丰度达到峰值；当年幼鲑鱼进入陆架区域。</td></tr><tr><td>8月</td><td>X</td><td>X</td><td>X</td><td>X</td><td>D/U W</td><td>M-H</td><td>S</td><td>陆架上当年幼鲑鱼丰度达到峰值。</td></tr><tr><td>10月</td><td>X</td><td>X</td><td>X</td><td>X</td><td>D S</td><td>H</td><td>H</td><td>陆架上的当年幼鲑鱼。</td></tr><tr><td>12月</td><td>X</td><td>X</td><td>X</td><td> </td><td>D S</td><td>M</td><td>M</td><td>为春季营养盐与小型浮游动物的变化开展秋冬季节预适应观测。</td></tr></tbody></table> 本次采样方案遵循GLOBEC规范，所用设备与技术与同样隶属于东北太平洋GLOBEC计划的俄勒冈州长期观测计划（Oregon LTOP）一致。本项目大部分研究工作将在“阿尔法螺旋号”科考船（R/V Alpha Helix）上开展。鱼类采样将于7、8、10月租用拖网渔船进行。两艘船将在相关航次中协同作业，以便租用拖网渔船能够验证从“阿尔法螺旋号”拖曳的声学阵列所探测到的鱼类目标。本页面最后更新于2000年9月22日。 维护方： <a href="mailto:hbatchelder@coas.oregonstate.edu">哈尔·巴奇尔德（Hal Batchelder）[hbatchelder@coas.oregonstate.edu]</a> 海洋与大气科学学院 俄勒冈州立大学 科瓦利斯，俄勒冈州 97331-5503 电话：541-737-4500；传真：541-737-2064

创建时间：

2026-04-06