Introduction to Oceanography
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Methane Cold Seeps As Biological Oases in the High‐
LIMNOLOGY and Limnol. Oceanogr. 00, 2017, 00–00 VC 2017 The Authors Limnology and Oceanography published by Wiley Periodicals, Inc. OCEANOGRAPHY on behalf of Association for the Sciences of Limnology and Oceanography doi: 10.1002/lno.10732 Methane cold seeps as biological oases in the high-Arctic deep sea Emmelie K. L. A˚ strom€ ,1* Michael L. Carroll,1,2 William G. Ambrose, Jr.,1,2,3,4 Arunima Sen,1 Anna Silyakova,1 JoLynn Carroll1,2 1CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway 2Akvaplan-niva, FRAM – High North Research Centre for Climate and the Environment, Tromsø, Norway 3Division of Polar Programs, National Science Foundation, Arlington, Virginia 4Department of Biology, Bates College, Lewiston, Maine Abstract Cold seeps can support unique faunal communities via chemosynthetic interactions fueled by seabed emissions of hydrocarbons. Additionally, cold seeps can enhance habitat complexity at the deep seafloor through the accretion of methane derived authigenic carbonates (MDAC). We examined infaunal and mega- faunal community structure at high-Arctic cold seeps through analyses of benthic samples and seafloor pho- tographs from pockmarks exhibiting highly elevated methane concentrations in sediments and the water column at Vestnesa Ridge (VR), Svalbard (798 N). Infaunal biomass and abundance were five times higher, species richness was 2.5 times higher and diversity was 1.5 times higher at methane-rich Vestnesa compared to a nearby control region. Seabed photos reveal different faunal associations inside, at the edge, and outside Vestnesa pockmarks. Brittle stars were the most common megafauna occurring on the soft bottom plains out- side pockmarks. -
Coastal and Marine Ecological Classification Standard (2012)
FGDC-STD-018-2012 Coastal and Marine Ecological Classification Standard Marine and Coastal Spatial Data Subcommittee Federal Geographic Data Committee June, 2012 Federal Geographic Data Committee FGDC-STD-018-2012 Coastal and Marine Ecological Classification Standard, June 2012 ______________________________________________________________________________________ CONTENTS PAGE 1. Introduction ..................................................................................................................... 1 1.1 Objectives ................................................................................................................ 1 1.2 Need ......................................................................................................................... 2 1.3 Scope ........................................................................................................................ 2 1.4 Application ............................................................................................................... 3 1.5 Relationship to Previous FGDC Standards .............................................................. 4 1.6 Development Procedures ......................................................................................... 5 1.7 Guiding Principles ................................................................................................... 7 1.7.1 Build a Scientifically Sound Ecological Classification .................................... 7 1.7.2 Meet the Needs of a Wide Range of Users ...................................................... -
Grade 3 Unit 2 Overview Open Ocean Habitats Introduction
G3 U2 OVR GRADE 3 UNIT 2 OVERVIEW Open Ocean Habitats Introduction The open ocean has always played a vital role in the culture, subsistence, and economic well-being of Hawai‘i’s inhabitants. The Hawaiian Islands lie in the Pacifi c Ocean, a body of water covering more than one-third of the Earth’s surface. In the following four lessons, students learn about open ocean habitats, from the ocean’s lighter surface to the darker bottom fl oor thousands of feet below the surface. Although organisms are scarce in the deep sea, there is a large diversity of organisms in addition to bottom fi sh such as polycheate worms, crustaceans, and bivalve mollusks. They come to realize that few things in the open ocean have adapted to cope with the increased pressure from the weight of the water column at that depth, in complete darkness and frigid temperatures. Students fi nd out, through instruction, presentations, and website research, that the vast open ocean is divided into zones. The pelagic zone consists of the open ocean habitat that begins at the edge of the continental shelf and extends from the surface to the ocean bottom. This zone is further sub-divided into the photic (sunlight) and disphotic (twilight) zones where most ocean organisms live. Below these two sub-zones is the aphotic (darkness) zone. In this unit, students learn about each of the ocean zones, and identify and note animals living in each zone. They also research and keep records of the evolutionary physical features and functions that animals they study have acquired to survive in harsh open ocean habitats. -
World Ocean Thermocline Weakening and Isothermal Layer Warming
applied sciences Article World Ocean Thermocline Weakening and Isothermal Layer Warming Peter C. Chu * and Chenwu Fan Naval Ocean Analysis and Prediction Laboratory, Department of Oceanography, Naval Postgraduate School, Monterey, CA 93943, USA; [email protected] * Correspondence: [email protected]; Tel.: +1-831-656-3688 Received: 30 September 2020; Accepted: 13 November 2020; Published: 19 November 2020 Abstract: This paper identifies world thermocline weakening and provides an improved estimate of upper ocean warming through replacement of the upper layer with the fixed depth range by the isothermal layer, because the upper ocean isothermal layer (as a whole) exchanges heat with the atmosphere and the deep layer. Thermocline gradient, heat flux across the air–ocean interface, and horizontal heat advection determine the heat stored in the isothermal layer. Among the three processes, the effect of the thermocline gradient clearly shows up when we use the isothermal layer heat content, but it is otherwise when we use the heat content with the fixed depth ranges such as 0–300 m, 0–400 m, 0–700 m, 0–750 m, and 0–2000 m. A strong thermocline gradient exhibits the downward heat transfer from the isothermal layer (non-polar regions), makes the isothermal layer thin, and causes less heat to be stored in it. On the other hand, a weak thermocline gradient makes the isothermal layer thick, and causes more heat to be stored in it. In addition, the uncertainty in estimating upper ocean heat content and warming trends using uncertain fixed depth ranges (0–300 m, 0–400 m, 0–700 m, 0–750 m, or 0–2000 m) will be eliminated by using the isothermal layer. -
Seafloor Mapping of the Continental Slope of the U.S. Atlantic Margin to Study Submarine Landslides That Could Trigger Tsunamis
Seafloor Mapping of the Continental Slope of the U.S. Atlantic Margin to Study Submarine Landslides that Could Trigger Tsunamis An additional Report to the Nuclear Regulatory Commission Job Code Number: N6480 By Atlantic and Gulf of Mexico Tsunami Hazard Assessment Group Seafloor Mapping of the Continental Slope of the U.S. Atlantic Margin to Study Submarine Landslides that Could Trigger Tsunamis An Additional Report to the Nuclear Regulatory Commission By Atlantic and Gulf of Mexico Tsunami Hazard Assessment Group: Uri ten Brink, David Twichell, Jason Chaytor, Bill Danforth, Brian Andrews, and Elizabeth Pendleton U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts, USA This reports provides additional information to the report Evaluation of Tsunami Sources with Potential to Impact the U.S. Atlantic and Gulf Coasts, submitted to the Nuclear Regulatory Commission on August 22, 2008. October 15, 2010 NOTICE FROM USGS This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represent that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. -
Marine Nature Conservation in the Pelagic Environment: a Case for Pelagic Marine Protected Areas?
Marine nature conservation in the pelagic environment: a case for pelagic Marine Protected Areas? Susan Gubbay September 2006 Contents Contents......................................................................................................................................... 1 Executive summary....................................................................................................................... 2 1 Introduction........................................................................................................................... 4 2 The pelagic environment....................................................................................................... 4 2.1 An overview...................................................................................................................... 4 2.2 Characteristics of the pelagic environment ....................................................................... 5 2.3 Spatial and temporal structure in the pelagic environment ............................................... 6 2.4 Marine life....................................................................................................................... 10 3 Biodiversity conservation in the pelagic environment........................................................ 12 3.1 Environmental concerns.................................................................................................. 12 3.2 Legislation, policy and management tools...................................................................... 15 -
MARINE ENVIRONMENTS Teaching Module for Grades 6-12
MARINE ENVIRONMENTS Teaching Module for Grades 6-12 Dear Educator, We are pleased to present you with the first in a series of teaching and learning modules developed by the DEEPEND (Deep-Pelagic Nekton Dynamics) consortium and their consultants. DEEPEND is a research network focusing primarily on the pelagic zone of the Gulf of Mexico, therefore the majority of the lessons will be based around this topic. Whenever possible, the lessons will focus specifically on events of the Gulf of Mexico or work from the DEEPEND scientists. All modules in this series aim to engage students in grades 6 through 12 in STEM disciplines, while promoting student learning of the marine environment. We hope these lessons enable teachers to address student misconceptions and apprehensions regarding the unique organisms and properties of marine ecosystems. We intend for these modules to be a guide for teaching. Teachers are welcome to use the lessons in any order they wish, use just portions of lessons, and may modify the lessons as they wish. Furthermore, educators may share these lessons with other school districts and teachers; however, please do not receive monetary gain for lessons in any of the modules. Moreover, please provide credit to photographers and authors whenever possible. This first module focuses on the marine environment in general including biological, chemical, and physical properties of the water column. We have provided a variety of activities and extensions within this module such that lessons can easily be adapted for various grade and proficiency levels. Given that education reform strives to incorporate authentic science experiences, many of these lessons encourage exploration and experimentation to encourage students to think and act like a scientist. -
The C-Floor and Zones
The C-Floor and zones Table of Contents ` ❖ The ocean zones ❖ Sunlight zone and twilight zone ❖ Midnight and Abyssal zone ❖ The hadal zone ❖ The c-floor ❖ The c-floor definitions ❖ The c-floor definitions pt.2 ❖ Cites ❖ The end The ocean zones 200 meters deep 1,000 Meters deep 4,000 Meters deep 6,000 Meters deep 10,944 meters deep Sunlight zone Twilight zone ❖ The sunlight zone is 200 meters from the ocean's ❖ The twilight zone is about 1,000 meters surface deep from the ❖ Animals that live here ocean's surface sharks, sea turtles, ❖ Animals that live jellyfish and seals here are gray ❖ Photosynthesis normally whales, greenland occurs in this part of the Shark and clams ocean ❖ The twilight get only a faint amount of sunlight DID YOU KNOW Did you know That no plants live That the sunlight zone in the twilight zone could be called as the because of the euphotic and means well lit amount of sunlight in greek Midnight zone Abyssal zone ❖ The midnight zone is ❖ The abyssal zone is 4,000 meters from 6,000 meters from the the ocean's surface ocean’s surface ❖ Animals that live in ❖ Animals that live in the the midnight zone Abyssal zone are fangtooth fish, pacific are, vampire squid, viperfish and giant snipe eel and spider crabs anglerfish ❖ Supports only ❖ Animals eat only the DID YOU KNOW invertebrates and DID YOU KNOW leftovers that come That only 1 percent of light fishes That most all the way from the travels through animals are sunlight zone to the the midnight zone either small or midnight zone bioluminescent The Hadal Zone (Trench ● The Hadal Zone is 10,944 meters under the ocean ● Snails, worms, and sea cucumbers live in the hadal zone ● It is pitch black in the Hadal Zone The C-Floor The C-Floor Definitions ❖ The Continental Shelf - The flat part where people can walk. -
Microbial Community and Geochemical Analyses of Trans-Trench Sediments for Understanding the Roles of Hadal Environments
The ISME Journal (2020) 14:740–756 https://doi.org/10.1038/s41396-019-0564-z ARTICLE Microbial community and geochemical analyses of trans-trench sediments for understanding the roles of hadal environments 1 2 3,4,9 2 2,10 2 Satoshi Hiraoka ● Miho Hirai ● Yohei Matsui ● Akiko Makabe ● Hiroaki Minegishi ● Miwako Tsuda ● 3 5 5,6 7 8 2 Juliarni ● Eugenio Rastelli ● Roberto Danovaro ● Cinzia Corinaldesi ● Tomo Kitahashi ● Eiji Tasumi ● 2 2 2 1 Manabu Nishizawa ● Ken Takai ● Hidetaka Nomaki ● Takuro Nunoura Received: 9 August 2019 / Revised: 20 November 2019 / Accepted: 28 November 2019 / Published online: 11 December 2019 © The Author(s) 2019. This article is published with open access Abstract Hadal trench bottom (>6000 m below sea level) sediments harbor higher microbial cell abundance compared with adjacent abyssal plain sediments. This is supported by the accumulation of sedimentary organic matter (OM), facilitated by trench topography. However, the distribution of benthic microbes in different trench systems has not been well explored yet. Here, we carried out small subunit ribosomal RNA gene tag sequencing for 92 sediment subsamples of seven abyssal and seven hadal sediment cores collected from three trench regions in the northwest Pacific Ocean: the Japan, Izu-Ogasawara, and fi 1234567890();,: 1234567890();,: Mariana Trenches. Tag-sequencing analyses showed speci c distribution patterns of several phyla associated with oxygen and nitrate. The community structure was distinct between abyssal and hadal sediments, following geographic locations and factors represented by sediment depth. Co-occurrence network revealed six potential prokaryotic consortia that covaried across regions. Our results further support that the OM cycle is driven by hadal currents and/or rapid burial shapes microbial community structures at trench bottom sites, in addition to vertical deposition from the surface ocean. -
Ocean Depths: the Mesopelagic and Implications for Global Warming
Current Biology Dispatches Ocean Depths: The Mesopelagic and Implications for Global Warming Mark J. Costello1,* and Sean Breyer2 1Institute of Marine Science, University of Auckland, Auckland, 1142, New Zealand 2ESRI, Redlands, CA 92373, USA *Correspondence: [email protected] http://dx.doi.org/10.1016/j.cub.2016.11.042 The mesopelagic or ‘twilight zone’ of the oceans occurs too deep for photosynthesis, but is a major part of the world’s carbon cycle. Depth boundaries for the mesopelagic have now been shown on a global scale using the distribution of pelagic animals detected by compiling echo-soundings from ships around the world, and been used to predict the effect of global warming on regional fish production. Depth Zonation Analyses were at 5 m depth intervals to However, it remains to be clearly shown The classical concepts for depth zonation 1,000 m deep, and a spatial resolution of whether the abyssal zone is ecologically [1] in the ocean begin at the seashore 300 km2. distinct from the bathyal. (Table 1). Distinct communities are visible The environment changes less as we The data shown in Figure 1 are global on the rocky seashore, and reflect the go deeper (Figure 1), so we expect the averages, and local exceptions will occur, adaptations of their animals and plants vertical extent of ecological zones to particularly in more enclosed waters such to exposure to air and wave action, increase with depth. While the rocky as the Mediterranean and Black Seas [6]. as well as the effects of grazing and seashore may have distinct habitats only The seabed-resident fauna (benthos) will predation [2]. -
The Hadal Zone Deep-Sea Trenches
The Hadal Zone Deep-sea Trenches •! Hadal - Ocean habitats deeper than 6,000m •! Deep-sea trenches comprise the overwhelming majority of these habitats •! Deepest: Mariana Trench – 10,998 m The Hadal Zone Map > 6000 m (Not only trenches!) World Hadal Trenches (Jamieson et al. 2009) 37 deep-sea trenches Most in the Pacific, deepest 9 in the Pacific Trench Environment Temperature: 1.0-2.5oC Temperature increases below 4000 m due to adiabatic heating South Pacific trench temperatures increase from 1.16 to 1.91oC between 6000 and 10000 m (40%) North Pacific trench temperatures rise from 1.67 to 2.40 oC between 6000 and 10000 m. (30%) Tonga Trench Temperature (Jamieson et al. 2009 TREE) Temperatures in trenches are comparable to 3000 m cont. margin Challenger Deep Cross Section CTD Casts Temperature and Salinity Taira et al. 2005 J. Of Oceanography Flow regime: Deep currents ventilate trenches with values up to 8.1 cm/sec in the Challenger Deep Up to 32 cm/s in other trenches Currents exhibit lunar and semi-lunar tidal cycles Mean oxygen in N. Pacific trenches 3.43 ml L-1 Why is the Mariana Trench so deep? 1. Plate configuration – Pacific plate is old and cold and plunging beneath the Philippine plate. The Philippine plate is young and soft and is carried downward with the Pacific plate. 2. Remoteness from sediment sources – it doesn’t fill up over time! Trench Biology – Historical (courtesy of L. Blankenship) •! Challenger – sounding to 8200 m (no fauna) •! Incidental collection of arenaceous foraminiferan at 7228 m Japan Trench (Brady 1984 – 14 spp.) •! In 1899, the “Albatross” trawled the Tonga Trench deeper waters for the first time. -
Active Continental Margin
Encyclopedia of Marine Geosciences DOI 10.1007/978-94-007-6644-0_102-2 # Springer Science+Business Media Dordrecht 2014 Active Continental Margin Serge Lallemand* Géosciences Montpellier, University of Montpellier, Montpellier, France Synonyms Convergent boundary; Convergent margin; Destructive margin; Ocean-continent subduction; Oceanic subduction zone; Subduction zone Definition An active continental margin refers to the submerged edge of a continent overriding an oceanic lithosphere at a convergent plate boundary by opposition with a passive continental margin which is the remaining scar at the edge of a continent following continental break-up. The term “active” stresses the importance of the tectonic activity (seismicity, volcanism, mountain building) associated with plate convergence along that boundary. Today, people typically refer to a “subduction zone” rather than an “active margin.” Generalities Active continental margins, i.e., when an oceanic plate subducts beneath a continent, represent about two-thirds of the modern convergent margins. Their cumulated length has been estimated to 45,000 km (Lallemand et al., 2005). Most of them are located in the circum-Pacific (Japan, Kurils, Aleutians, and North, Middle, and South America), Southeast Asia (Ryukyus, Philippines, New Guinea), Indian Ocean (Java, Sumatra, Andaman, Makran), Mediterranean region (Aegea, Cala- bria), or Antilles. They are generally “active” over tens (Tonga, Mariana) or hundreds (Japan, South America) of millions of years. This longevity has consequences on their internal structure, especially in terms of continental growth by tectonic accretion of oceanic terranes, or by arc magmatism, but also sometimes in terms of continental consumption by tectonic erosion. Morphology A continental margin generally extends from the coast down to the abyssal plain (see Fig.