Zooplankton catch data from Tucker trawls from CGOA LTOP cruises from the Coastal Gulf of Alaska, Northeast Pacific, 2001-2003 (NEP project)

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Zooplankton counts for tucker trawls in the Gulf of Alaska during 2001 - 2003 co-PI: Edward D. Cokelet (NOAA/OAR/PMEL) co-PI: Edward V. Farley (NOAA/NMFS) co-PI: Seth Danielson (IMS, U. Alaska - Fairbanks) co-PI: Ken Coyle (IMS, U. Alaska - Fairbanks) updated July 2008 <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 <a href=\"http://nepglobec.bco-dmo.org/reports/cgoa_cruises/cgoa_cr_rpts.html\" target=\"blank\">cruise reports</a> web site GLOBEC 2000: Gulf of Alaska Long-Term Observation Program T. Weingartner, L. Haldorson, R. Hopcroft, K. Coyle, T. E. Whitledge (all at University of Alaska, Fairbanks), T. Royer (Old Dominion University) 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.   <hr /> 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

2001-2003年阿拉斯加湾塔克拖网浮游动物计数数据集 共同首席研究员：Edward D. Cokelet（美国国家海洋和大气管理局/海洋与大气研究办公室/太平洋海洋环境实验室，NOAA/OAR/PMEL） 共同首席研究员：Edward V. Farley（美国国家海洋和大气管理局/国家海洋渔业局，NOAA/NMFS） 共同首席研究员：Seth Danielson（阿拉斯加大学费尔班克斯分校海洋科学研究所，IMS, U. Alaska - Fairbanks） 共同首席研究员：Ken Coyle（阿拉斯加大学费尔班克斯分校海洋科学研究所，IMS, U. Alaska - Fairbanks） 更新于2008年7月 <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 <a href="http://nepglobec.bco-dmo.org/reports/cgoa_cruises/cgoa_cr_rpts.html" target="blank">航次报告</a>网站 全球海洋生态系统动态计划（GLOBEC）2000：阿拉斯加湾长期观测计划 T. Weingartner、L. Haldorson、R. Hopcroft、K. Coyle、T. E. Whitledge（均来自阿拉斯加大学费尔班克斯分校）、T. Royer（老道明大学） 本项目旨在开展阿拉斯加湾长期观测计划（GOA-LTOP），作为东北太平洋（NEP）全球海洋生态系统动态计划（GLOBEC）第二阶段的一部分。阿拉斯加湾（GOA）陆架区支撑着丰富的生态系统，包括多种具有重要商业价值的渔业资源。该区域生产力的形成机制尚不明晰——因其陆架较深，受利于下沉的风场驱动，且受大量低营养盐的沿岸淡水输入影响。风场与淡水输入均与阿留申低压的强度和位置密切相关。GOA生态系统在年代际和年际时间尺度上经历显著的物理和生物变化。尽管部分变化与多种气候指数相关，但气候变化与生态系统响应之间的机制性理解仍缺失。本长期观测计划（LTOP）的总体目标是理解并量化该陆架区温盐、化学和生物属性及其相互关系的时间（季节和年际）和空间（跨陆架及沿陆架）变化。我们的提案支持GLOBEC的目标，包括：1）助力回顾性研究解读历史数据；2）设计具成本效益的长期监测方案；3）为同期中尺度和过程研究提供季节及年际背景；4）为模型评估提供边界条件和数据集。本5年期项目包含4年野外工作及1年数据分析与综合。野外工作涉及每年在阿拉斯加湾北部开展7次、每次9天的跨学科航次。研究区域涵盖220公里长的苏厄德线（Seward Line，1970年代曾采样），该线横跨陆架与陆坡；此外还包括对阿拉斯加沿岸流（ACC）上游、下游及威廉王子湾内的高分辨率采样。ACC是当年生（yoy）鲑鱼从湾内育苗区迁移至GOA的重要陆架栖息地。采样工作（表A）为全年开展，主要针对影响当年生粉红鲑的季节性关键物理和生物事件。 表A. GOA-LTOP采样计划及依据。（风况、径流量与层结说明：S=强；M=中等；W=弱；D=下沉风；U=上升风；V=多变；L=低；H=高）7-8月上升风期间，深水向近岸移动。 <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">物理学依据</th> <th colspan="1" rowspan="2">生物学依据</th> </tr> <tr> <td>温盐深仪（CTD）</td> <td>营养盐</td> <td>浮游动物（Zooplankton）</td> <td>鱼类</td> <td>风况</td> <td>径流量（Discharge）</td> <td>层结（Stratification）</td> </tr> <tr> <td>3月</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>强下沉风（D S）</td> <td>低（L）</td> <td>弱（W）</td> <td>浮游动物从深海（陆架坡折处）迁移，向近岸输送。</td> </tr> <tr> <td>4月</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>中等下沉风（D M）</td> <td>低-中等（L-M）</td> <td>弱-多变（W V）</td> <td>浮游植物水华（phytoplankton bloom）</td> </tr> <tr> <td>5月</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>中等-弱下沉风（D M-W）</td> <td>中等（M）</td> <td>中等-多变（M V）</td> <td>海洋桡足类（copepod）生物量峰值。</td> </tr> <tr> <td>7月</td> <td>X</td> <td>X</td> <td>X</td> <td>X</td> <td>弱下沉/上升风（D/U W）</td> <td>中等-高（M-H）</td> <td>强（S）</td> <td>浮游动物丰度峰值；当年生鲑鱼（YOY salmon）进入陆架。</td> </tr> <tr> <td>8月</td> <td>X</td> <td>X</td> <td>X</td> <td>X</td> <td>弱下沉/上升风（D/U W）</td> <td>中等-高（M-H）</td> <td>强（S）</td> <td>陆架区当年生鲑鱼丰度峰值。</td> </tr> <tr> <td>10月</td> <td>X</td> <td>X</td> <td>X</td> <td>X</td> <td>强下沉风（D S）</td> <td>高（H）</td> <td>高（H）</td> <td>当年生鲑鱼在陆架区。</td> </tr> <tr> <td>12月</td> <td>X</td> <td>X</td> <td>X</td> <td> </td> <td>强下沉风（D S）</td> <td>中等（M）</td> <td>中等（M）</td> <td>秋冬季节为春季营养盐和小型浮游动物积累条件。</td> </tr> </tbody> </table> 采样方案遵循GLOBEC指南，使用的设备类型和技术与俄勒冈长期观测计划（Oregon LTOP，同为NEP-GLOBEC项目一部分）相似。大部分研究将在“阿尔法螺旋”号科考船（R/V Alpha Helix）上开展。鱼类采样将在7、8、10月通过租赁拖网渔船进行。这些航次中两艘船将协同工作，以便租赁渔船可验证“阿尔法螺旋”号拖曳声学阵列探测到的鱼类目标。 本页面最后更新于2000年9月22日。 维护者： <a href="mailto:hbatchelder@coas.oregonstate.edu">Hal Batchelder [hbatchelder@coas.oregonstate.edu</a> 俄勒冈州立大学海洋与大气科学学院 美国俄勒冈州科瓦利斯市，邮编97331-5503 电话：541-737-4500；传真：541-737-2064

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2025-03-09