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)

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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（Bongo net）采样数据 2004年于阿拉斯加湾开展的邦戈网拖网采样中的浮游动物计数数据。 <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（Global Ocean Ecosystem Dynamics, GLOBEC）计划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仍不明朗：其水体深邃，受有利于下降流的风力驱动，且由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及位置密切相关。阿拉斯加湾生态系统在年代际及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的温盐、化学及生物属性及其相互关系在时间（季节与年际）和空间（跨陆架与沿陆架）尺度上的变化特征。本项目方案旨在助力全球海洋生态系统动力学研究计划的目标达成，具体包括：1）辅助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）为同期开展的中尺度过程研究提供季节与年际尺度的背景信息；4）为模型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天的多学科考察航次。研究区域涵盖全长220公里的苏厄德断面（Seward Line，该断面于20世纪70年代开展过采样），该断面横跨陆架与陆坡，同时还包含对阿拉斯加沿岸流（Alaska Coastal Current, ACC）的高分辨率采样，采样范围覆盖该海流的上游、下游以及威廉王子湾内部。阿拉斯加沿岸流是幼龄鲑鱼从威廉王子湾育苗场迁徙至阿拉斯加湾的重要陆架栖息环境。本次采样工作（见表A）全年开展，其设计依据为影响当年生粉红鲑的关键季节物理与生物事件。 表A. 阿拉斯加湾长期观测计划采样安排与依据。（风力、径流与层化参数说明：S=强；M=中等；W=弱；D=下降流型风；U=上升流型风；V=多变；L=低；H=高） 7-8月上升流期间，深层水会上涌至近岸。 <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> <th>温盐深剖面仪（CTD）</th> <th>营养盐采样</th> <th>浮游动物采样</th> <th>鱼类采样</th> <th>风力状况</th> <th>径流状况</th> <th>层化状况</th> </tr> <tr> <td>3月</td> <td>✓</td> <td>✓</td> <td>✓</td> <td> </td> <td>D S</td> <td>L</td> <td>W</td> <td>浮游动物从陆坡坡折处的深水层迁移，并被输送至近岸。</td> </tr> <tr> <td>4月</td> <td>✓</td> <td>✓</td> <td>✓</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>✓</td> <td>✓</td> <td>✓</td> <td> </td> <td>D M-W</td> <td>M</td> <td>M V</td> <td>海洋桡足类生物量达到峰值。</td> </tr> <tr> <td>7月</td> <td>✓</td> <td>✓</td> <td>✓</td> <td>✓</td> <td>D/U W</td> <td>M-H</td> <td>S</td> <td>浮游动物丰度达到峰值；当年幼鲑进入陆架水域。</td> </tr> <tr> <td>8月</td> <td>✓</td> <td>✓</td> <td>✓</td> <td>✓</td> <td>D/U W</td> <td>M-H</td> <td>S</td> <td>陆架水域当年幼鲑丰度达到峰值。</td> </tr> <tr> <td>10月</td> <td>✓</td> <td>✓</td> <td>✓</td> <td>✓</td> <td>D S</td> <td>H</td> <td>H</td> <td>陆架水域存在当年幼鲑。</td> </tr> <tr> <td>12月</td> <td>✓</td> <td>✓</td> <td>✓</td> <td> </td> <td>D S</td> <td>M</td> <td>M</td> <td>为春季营养盐循环与小型浮游动物群落提供秋冬季节的预适应环境。</td> </tr> </tbody> </table>   本次采样方案遵循全球海洋生态系统动力学研究计划的规范，所使用的设备与技术与同样隶属于东北太平洋全球海洋生态系统动力学研究计划的俄勒冈州长期观测计划（Oregon LTOP）一致。大部分科考作业将在“阿尔法螺旋号”（R/V Alpha Helix）研究船上开展。鱼类采样将于7月、8月与10月租用拖网渔船完成。两艘船只将在对应航次中协同作业，以便通过租用拖网渔船验证“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）</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：

2021-12-05