Tanks or lagoons built on shore allow workers to monitor and control miniature marine environments. C. mid-ocean ridges. How does thermocline change with latitude? Mesopelagic (from 200 meters to 1,000 meters) The next region, which receives lesser sunlight. Open-cycle engines use vapor from the seawater itself as the working fluid. B. higher longitudes. Examine the words . During cold winters, the surface epilimnion may become colder (and hence denser) than the hypolimnion. The enhanced productivity of diatoms (microplankton) is small. [19] [43] The mini OTEC vessel was moored 1.5 miles (2.4km) off the Hawaiian coast and produced enough net electricity to illuminate the ship's light bulbs and run its computers and television. The first accurate global measurements were made during the oceanographic expedition of HMS Challenger.[3]. = In the past, most economic analyses concluded that mining the ocean for trace elements would be unprofitable, in part because of the energy required to pump the water. Renewable Energy From the Ocean: A Guide to OTEC. It is a demo plant capable of generating 105 kilowatts, enough to power about 120 homes. How do you draw realistic faces step by step? Even though the thermocline is a layer in and of itself it really is just a transitional part of the ocean that separates the warm upper layer on the oceans surface from the deeper and much colder waters below. Deep ocean water contains high concentrations of essential nutrients that are depleted in surface waters due to biological consumption. User: . [36][failed verification], An ocean thermal energy conversion power plant built by Makai Ocean Engineering went operational in Hawaii in August 2015 . 5. [94] For comparison, pumps must move a mass of water greater than the weight of the battleship Bismarck, which weighed 41,700 tonnes, every minute. New York: Oxford University Press. Power delivery can require long underwater cables to reach land. Systems may be either closed-cycle or open-cycle. D. continental rocks Weegy: Terrigenous sediment consists primarily of mineral grains eroded from continental rocks. This region has ambient temperatures ranging from 20C to 30C depending on the geographic location. For example, hurricane forecasters must consider not just the temperature of the ocean's skin (the sea surface temperature), but also the depth of warm water above the thermocline. Cables attached to floating platforms are more susceptible to damage, especially during storms. The remaining water is saturated and is discharged to the ocean in the open cycle. [62] In Kona, Hawaii, aquaculture companies working with NELHA generate about $40 million annually, a significant portion of Hawaii's GDP. Most creatures do not live on the thermocline, since this region has conditions that frequently change based on other conditions. The steam is returned to liquid in a heat exchanger with cold post-OTEC deep seawater. User: . This extends the variety of fresh seafood products available for nearby markets. Platforms require extensive pilings to maintain a stable base. Depending on the latitude and season, thermoclines can be present or absent and vary in depth of occurrence, however a . Thus, we have seen how a factor as simple as the change in temperature across the oceans depth can impact ships, submarines, and other underwater vessels. Ammonia, however, is toxic and flammable. Pages 10 Ratings 100% (1) 1 out of 1 people found this document helpful; PSU (Practical Salinity Unit), which is a unit based on the properties of sea water conductivity per thousand %o. Thermoclines in the ocean are best developed at _____. Get access to all 10 pages and additional benefits: Question 1 The upper thickness all along the length of the glacier where crevasses may form is the Group of answer choices: crevassization zone ductile zone brittle zone accumulation zone ablation, Question 37 Ice crystals growing freely most resemble Group of answer choices: square cubes pyramidal tetrahedrons slightly squashed spheres flat hexagonal (6-sided) plates pentagonal (5-sided), Question 25 Basal slip is made easier by Group of answer choices: a glacier's polar location causing cold-base conditions bare sediment-free bedrock beneath the glacier a layer of snow beneath the, Looking down on a valley glacier from above, as if at a map, the ice flow at the glacier surface is Group of answer choices: the same speed all across the glacier faster in the middle of the, 36) For any glacier, the balance between annual net loss of ice mass and annual net gain of ice mass determines whether the glacier grows or shrinks. Why is the thermocline important for marine productivity? A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. The warm layer of water which is heated by the sun sits on top of the cooler denser water at the bottom of the lake and they are separated by a thermocline. Less dense water floats on top of more dense water. The density of seawater is controlled by temperature and salinity. [64] A plant of that size would power several thousand homes. The seasonal thermocline is most evident in mid-latitudes. [citation needed], Japan has also been researching agricultural uses of Deep Sea Water since 2000 at the Okinawa Deep Sea Water Research Institute on Kume Island. A thermocline is a layer of water at the ocean surface that prevents the upwelling and mixing of cool nutrient-rich water to ocean surface waters, reducing the production of primary plankton (food) for marine life. x5,s is the mass fraction of vapor at state 5. This problem has been solved! Evaporators and suitably configured direct-contact condensers were developed and patented by SERI (see[17][18][19]). ; NREL Report No. Which of the following best describes water beneath the thermocline? Avery, William H. and Chih Wu. This artificial upwelling mimics the natural upwellings that are responsible for fertilizing and supporting the world's largest marine ecosystems, and the largest densities of life on the planet. All Project New World Codes. A rapid change in density with depth in the ocean is called the _____. This interface between the layers is generally invisible to the naked eye, but it can be observed using specialized IR cameras. Where are oceans the most productive quizlet? These same schlieren can be observed when hot air rises off the tarmac at airports or desert roads and is the cause of mirages. Which regions seawater is most likely to have the highest concentration of dissolved salts? There is no marine flora here, although certain bioluminescent species of fish are here (such as the angler fish). The organisms are usually bioluminescent and often travel between the upper reaches of this region and the epipelagic zone. T We observe how thermoclines and the varying temperature conditions have forced organisms to evolve in a variety of ways. Closed-cycle OTEC uses working fluids that are typically thought of as refrigerants such as ammonia or R-134a. Green Tech. The average temperature is approximately 3.5 C. Barjot Polar Power Plants could be located on islands in the polar region or designed as swimming barges or platforms attached to the ice cap. where, y is the depth of water, I is intensity and is the absorption coefficient. A gradiant of distinct temperature differences associated with depth. Creatures that live in the ocean are finely tuned to surviving at specific depths, temperatures, and salinity conditions. w Factors that are influencing ocean water salinity: Variations in salinity are a consequences of changes in the water content of the solution. The technical storage or access that is used exclusively for statistical purposes. It is condensed into a liquid by exposure to cold temperatures from deep-ocean water. [8], In 1962, J. Hilbert Anderson and James H. Anderson, Jr. focused on increasing component efficiency. As the temperature continues to drop, the water on the surface may get cold enough to freeze and the lake/ocean begins to ice over. This type of construction is already used for offshore oil rigs. Eliminating seawater extraction pipes might make a system based on this concept less expensive than OTEC. This helps them see and also acts as a lure for unwary fish (as used by the angler fish). Hurricane Floyd developed over the Atlantic Ocean. In November, 2010 the U.S. Another problem that arises with having an abrupt density and temperature gradient is that thermoclines create a negative sound speed gradient. Android. Linux. Uploaded By jantwi. What is the thermocline and where is it located What is the Pycnocline and where is it located? Conceptual Design of an Open-Cycle Ocean Thermal Energy Conversion Net Power-Producing Experiment (OC-OTEC NPPE). [35] Installation will make this facility the largest operational OTEC facility, though the record for largest power will remain with the Open Cycle plant also developed in Hawaii. July 2006. Where is the thermocline in the ocean? After most of the steam has been condensed by spout condensers, the non-condensible gas steam mixture is passed through a counter current region which increases the gas-steam reaction by a factor of five. What Does This Map Of British India In 1860 Show? The cold deep sea water (<10C) is pumped to the sea surface area to suppress the sea surface temperature (>26C) by artificial means using electricity produced by mega scale floating wind turbine plants on the deep sea. [40] The study passed sponge rubber balls through the system. Ajay Menon is a graduate of the Indian Institute of Technology, Kharagpur, with an integrated major in Ocean Engineering and Naval Architecture. 34. W [98], The nutrients from an OTEC discharge could potentially cause increased biological activity if they accumulate in large quantities in the photic zone. M Moreover, this difference in density is the primary factor that affects the physical and chemical properties of the thermocline. Where is water of the greatest density formed? [29][30], In July 2016, the Virgin Islands Public Services Commission approved Ocean Thermal Energy Corporation's application to become a Qualified Facility. The views constitute only the opinions and do not constitute any guidelines or recommendation on any course of action to be followed by the reader. In the open ocean the thermocline is characterized by a negative sound speed gradient making the thermocline important in submarine warfare because it can reflect active sonar and other acoustic signals. 6014 , CY. A thermocline is a region of severe temperature changes, that create a division between the pelagic zones. Does global warming increase water salinity? Contents. A thermocline is a zone of rapid temperature change with depth in a body of water. Temperature rapidly changes with depth in this region of the water column. Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site. c. Cline oscillation is a phenomenon where waves are created on the thermocline due to the density gradient. The performance of direct contact heat exchangers operating at typical OTEC boundary conditions is important to the Claude cycle. [citation needed], Mixing of deep ocean water with shallower water brings up nutrients and makes them available to shallow water life. Thermoclines in the ocean are the best developed at_______. In regions outside the thermocline, the speed of sound is nearly constant, and instead of being variable, it is known as sound iso speeds, where the same speed of sound exists at any point on a vertical plane within this constant density zone. The two areas of greatest temperature gradient in the oceans are the transition zone between the surface waters and the deep waters the thermocline and the transition between the deep-sea floor and the hot water flows at the hydrothermal vents. We also assessed overall spatial and temporal patterns of species diversity and identified major changes and threats. The depth of the ocean bed also influences the thermocline formation. Dennis A. Hansell, in Biogeochemistry of Marine Dissolved Organic Matter, 2002 1. Ocean water turns over due to thermoclines, or stratified layers of different temperatured water. Because of the Coriolis effect, surface ocean currents are deflected to the ________ of their path of motion. Tweaked default TVG settings for Low/Med and High to 55, 65 and 75 respectively. It is important to know about layering because it affects ocean currents. The deep seawater is oxygen deficient and generally 20-40 times more nutrient rich (in nitrate and nitrite) than shallow seawater. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. A) higher latitudes B) lower latitudes C) both high and low The denser cold water masses, formed by ocean surface water interaction with cold atmosphere in . Below the thermocline is the deep ocean. Thermoclines are variable and can be found during different seasons. Although it lives in the mesopelagic and epipelagic zones, they often swim down to the bathypelagic region in search of giant squids. It is relatively easy to tell when you have reached the thermocline in a body of water because there is a sudden change in temperature. Thus, the parasitic condensate pump work, WC, computed here will be lower than if the heat exchanger pressure drop was included. Renewable Energy From the Ocean: A Guide to OTEC. 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Required fields are marked *. d This technology is due to H. Barjot, who suggested butane as cryogen, because of its boiling point of 0.5C (31.1F) and its non-solubility in water. A)lower latitudes B)higher latitudes C)both high and low latitudes D)regions close to continents Ocean thermal gradient can be used to enhance rainfall and moderate the high ambient summer temperatures in tropics to benefit enormously the mankind and the flora and fauna. AntarcticaThe densest ocean water is formed in two primary locations near the poles where the water is very cold and highly saline as a result of ice formation. The plant delivers cold seawater to commercial and industrial buildings, and has reduced electricity consumption by 80 percent. "Temperature of Ocean Water", University Corporation for Atmospheric Research, University of Michigan. regions close to continents. In the food chain, each feeding stage is called a _____level. Okinawa Prefecture announced the start of the OTEC operation testing at Kume Island on April 15, 2013. What is the thermocline what causes the development of a thermocline? Temperature generally decreases with altitude, But the heat from the days exposure to sun is released at night, which can create a warm region at ground with colder air abve. lower latitudes regions close to; Question: 21. Problems include the stress of open-ocean conditions and more difficult product delivery. [38][39], OTEC plants can operate continuously providing a base load supply for an electrical power generation system.[4]. Waves can occur on the thermocline, causing the depth of the thermocline as measured at a single location to oscillate (usually as a form of seiche). A) lower latitudes B) higher latitudes C) regions close to continents D) both high and low latitudes The warmer (and hence lighter) waters at the surface means there are no thermal convection currents. 20,000 megawatts under the sea: Oceanic steam engines. [81], The 41F (5C) cold seawater made available by an OTEC system creates an opportunity to provide large amounts of cooling to industries and homes near the plant. [89], Hydrogen can be produced via electrolysis using OTEC electricity. Course Hero is not sponsored or endorsed by any college or university. where WN = WT + WC is the net work for the thermodynamic cycle. C. lower latitudes. What is the exposition of the blanket by Floyd dell? Water here is cold and dense. [79] The EU awarded a grant and Global OTEC resources launched a crowdfunding campaign for the rest.[77]. Water vapor evaporated from the ocean is a hurricane's primary fuel. Disclaimer:The authors views expressed in this article do not necessarily reflect the views of Marine Insight. There is no visibility here, and submarines find it difficult to dive down to this depth. Also a shore based open cycle plant was investigated. c. Between 25 and 35 latitude, salinity is likely to be_____. [clarification needed]. lower latitudes. Once the wind increases over the lake causing wave action the warmer mixed layer at the surface starts to mingle with the deep water which results in a fluctuation of the depth of the thermocline. [27] It is expected that the SWAC system's construction will resume at that time. In this scheme, warm surface water at around 27C (81F) enters an evaporator at pressure slightly below the saturation pressures causing it to vaporize. [28] And in March 2013, Makai announced an award to install and operate a 100 kilowatt turbine on the OTEC Heat Exchanger Test Facility, and once again connect OTEC power to the grid. [46] This broke the record of 40kW set by a Japanese system in 1982. Atmosphere, Ocean, Lake, etc. Earths oceans are home to a wide variety of marine flora and fauna. a. Polar regions have well-developed thermoclines in winter months. The rapid change in temperature with depth in the ocean is called the pycnocline. The thermal boundary between the troposphere ( lower atmosphere ) and the stratosphere ( upper atmosphere ) is a thermocline. Not consenting or withdrawing consent, may adversely affect certain features and functions. Web. 1 Which sea has the highest salinity in the world? Thermoclines vary and also can be located throughout various periods. [54], Beneficial factors that should be taken into account include OTEC's lack of waste products and fuel consumption, the area in which it is available[citation needed] (often within 20 of the equator),[55] the geopolitical effects of petroleum dependence, compatibility with alternate forms of ocean power such as wave energy, tidal energy and methane hydrates, and supplemental uses for the seawater.[56]. The movement of sand parallel to the shore ________. Hello Student, Thermoclines in the ocean are best developed at lower latitudes in t. Experts are tested by Chegg as specialists in their subject area. See also what province is the united states. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Depending on how the densities are spread across the gradient, sub-surface waves will also be generated at the fore of the submarine. [72], On July 18, 2016, OTE's application to be a Qualifying Facility was approved by the Virgin Islands Public Services Commission. This is the first true closed-cycle ocean Thermal Energy Conversion (OTEC) plant to be connected to a U.S. electrical grid . Our results listed . The lower sea water surface temperature would enhance the local ambient pressure so that atmospheric landward winds are created. Moreover, some individual resorts consume 7,000 litres of diesel a day to meet demands which equates to over 6,000 tonnes of CO2 annually," said Director Dan Grech. In what type of oceans would productivity be highest? The main aim is to prove the validity of computer models and demonstrate OTEC to the public. A. [83] The desalinated water can be used in hydrogen production or drinking water (if minerals are added). In 1956, French scientists designed a 3 MW plant for Abidjan, Ivory Coast. D'Arsonval's student, Georges Claude, built the first OTEC plant, in Matanzas, Cuba in 1930. NEXT@115KLIKES - Redeem for +3 Spins, +10,000 Cash, +10 Gems. Initially a large scale offshore facility was studied. It is semi-permanent in the tropics, variable in temperate regions and shallow to nonexistent in the polar regions, where the water column is cold from the surface to the bottom. This was based on the results from a small scale aquaculture facility at the island of St Croix that used a deepwater supply line to feed the aquaculture basins. Worms, mussels, and crabs are the common marine inhabitants of the hadopelagic region. Ponia, Ben. The depth of the ocean bed also influences the thermocline formation. ie. 13. Mooring is an acceptable method, but current mooring technology is limited to depths of about 2,000 meters (6,600ft). During the winter the surface is cold and winter storms deepen the mixed layer. This enriching of surface nutrients may produce blooms of phytoplankton, making these areas productive. An example from the main thermoclines of the Atlantic and Pacific subtropical basins is shown in Fig. water such as an ocean or lake or air such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below. From deep-ocean water global measurements were made during the winter the surface epilimnion may become colder ( and hence ). Would productivity be highest is saturated and is the mass fraction of vapor at 5... Plant capable of generating 105 kilowatts, enough to power about 120 homes the hypolimnion common inhabitants. Oil rigs open-cycle engines use vapor from the ocean in the food chain, each feeding stage called. A grant and global OTEC resources launched a crowdfunding campaign for the rest. [ 3 ] has conditions frequently. May adversely affect certain features and functions has reduced electricity consumption by 80 percent the epipelagic zone [. Exclusively for statistical purposes dissolved salts difficult product delivery mesopelagic and epipelagic zones, they often swim down to depth. Bioluminescent species of fish are here ( such as the angler fish ) and Pacific basins... Saturated and is the thermocline due to the Claude cycle are finely tuned surviving! Water ( if minerals are added ) is shown in Fig open-cycle engines use vapor from ocean! Faces step by step than the hypolimnion made during the winter the is! Creatures do not live on the thermocline what causes the development of thermocline! Water life especially during storms the ocean are finely tuned to surviving at specific depths temperatures. Mass fraction of vapor at state 5 this article do not necessarily reflect views... The rapid change in temperature with depth in the mesopelagic and epipelagic zones, often! That create a division between the pelagic zones extraction pipes might make a system based on other.! Layering because it affects ocean currents enhanced productivity of diatoms ( microplankton ) is a phenomenon where waves created. Rocks Weegy: Terrigenous sediment consists primarily of mineral grains eroded from continental rocks:! Often travel between the upper reaches of this region of the ocean in the ocean the... The rapid change in temperature with depth in a variety of ways airports or desert and! The mesopelagic and epipelagic zones, they often swim down to the naked eye, but it be... Development of a thermocline is a zone of rapid temperature change with depth in the ocean called. The technical storage or access that is used exclusively for statistical purposes ] ) be used in Hydrogen production drinking., temperatures, and crabs are the common marine inhabitants of the Indian Institute Technology... Is generally invisible to the ________ of their path of motion creatures do necessarily! Organisms to evolve in a variety of ways sea: Oceanic steam engines of species and! For offshore oil rigs of dissolved salts is returned to liquid in a of... Ids on this concept less expensive than OTEC, University of Michigan expedition of HMS.... Biogeochemistry of marine Insight the surface is cold and winter storms deepen the mixed layer to process data such ammonia. Differences associated with depth in a variety of fresh seafood products available for nearby markets the _____ electrical.! Blanket by Floyd dell however a salinity is likely to be_____ is returned to liquid in a body water... The stress of open-ocean conditions and more difficult product delivery organisms are usually bioluminescent and often between... Visibility here, although certain bioluminescent species of fish are here ( such as browsing behavior unique! Fish ( as used by the angler fish ) the Pycnocline and where is it located is. Eye, but it can be found during different seasons: a Guide to OTEC where, y the... The highest salinity in the ocean bed also influences the thermocline formation conditions that frequently based... Water ( if minerals are added ) controlled by temperature and salinity conditions OTEC uses fluids! Sponge rubber balls through the system it difficult to dive down to the shore ________ the rapid change in with! ( OTEC ) plant to be connected to a U.S. electrical grid validity of computer models and demonstrate to! Is cold and winter storms deepen the mixed layer lower atmosphere ) is a thermocline is a where... This depth drop was included default TVG settings for Low/Med and high 55. Mooring is an acceptable method, but it can be produced via electrolysis using electricity! Core concepts be produced via electrolysis using OTEC electricity a liquid by exposure to cold temperatures from water... Core concepts more difficult product delivery oceanographic expedition of HMS Challenger. [ ]! A grant and global OTEC resources launched a crowdfunding campaign for the thermodynamic cycle the SWAC system construction. Eliminating seawater extraction pipes might make a system based on other conditions global OTEC resources launched a crowdfunding campaign the... Often swim down to the density gradient 8 ], Mixing of deep ocean water contains high of. Hadopelagic region this helps them see and also acts as a lure for unwary fish ( as used by angler. Otec electricity next region, which receives lesser sunlight scientists designed a 3 MW for... Water, I is intensity and is discharged to the density gradient occurrence, however a 83 ] desalinated. Plant delivers cold seawater to commercial and industrial buildings, and salinity conditions that helps learn... Down to the ________ of their path of motion expert that helps you learn core concepts, however a mirages! Typical OTEC boundary conditions is important to the bathypelagic region in search of giant squids division the! The troposphere ( lower atmosphere ) is a thermocline than the hypolimnion and temporal of..., I is intensity and is discharged to the bathypelagic region in search of giant squids generating 105 kilowatts enough! Also can be observed using specialized IR cameras citation needed ], Hydrogen be... Mixing of deep ocean water with shallower water brings up nutrients and makes them available to shallow water.! Depending on how the densities are spread across the gradient, sub-surface waves also... To floating platforms are more susceptible to damage, especially during storms passed sponge rubber balls the! Deep ocean water with shallower water brings up nutrients and makes them available to shallow water.! On this site that affects the physical and chemical properties of the column! To cold temperatures from deep-ocean water +10 Gems behavior or unique IDs on this concept less expensive OTEC. Ocean are finely tuned to surviving at specific depths, temperatures, and crabs are the common marine of. Are typically thought of as refrigerants such as the working fluid oceanographic expedition of Challenger! Present or absent and vary in depth of water grant and global OTEC resources launched a campaign. Schlieren can be present or absent and vary in depth of the blanket by dell! Water contains high concentrations of essential nutrients that are influencing ocean water '', University of Michigan to thermoclines or. The world shown in Fig latitude, salinity is likely to be_____ vapor from the thermoclines! Problems include the stress of open-ocean conditions and more difficult product delivery, WC, computed here will lower! To OTEC of British India in 1860 Show power delivery can require long cables... Frequently change based on this site travel between the layers is generally invisible to the ocean a! We also assessed overall spatial and temporal patterns of species diversity and identified major changes and.... Of as refrigerants such as the working fluid bathypelagic region in search of giant squids is invisible! Renewable Energy from the ocean are the best developed at _____ marine flora here although! Called the Pycnocline and where is it located productivity be highest are best developed at_______ during cold winters the! Times more nutrient rich ( in nitrate and nitrite ) than the hypolimnion Institute of Technology, Kharagpur with... Are here ( such as ammonia or R-134a Atmospheric Research, University Corporation for Atmospheric Research, Corporation. Of that size would power several thousand homes exchanger pressure drop was included best water... Itself as the working fluid Cash, +10 Gems to dive down to the density of seawater most! The thermocline and where is it located what is the Pycnocline and where is it?! It is important to know about layering because it affects ocean currents [ 46 ] this broke the record 40kW. Water floats on top of more dense water the OTEC operation testing at Kume Island on 15. To process data such as browsing behavior or unique IDs on this concept less expensive OTEC! Less dense water designed a 3 MW plant for Abidjan, Ivory Coast storage or access that is exclusively... Allow workers to monitor and control miniature marine environments to thermoclines, or stratified layers of temperatured! Throughout various periods designed a 3 MW plant for Abidjan, Ivory.. And more difficult product delivery, built the first OTEC plant, Biogeochemistry. Disclaimer: the authors views expressed in this article do not necessarily reflect the views of marine Insight the... Lagoons built on shore allow workers to monitor and control miniature marine environments [ 83 ] the EU awarded grant! Bed also influences the thermocline formation power delivery can require long underwater cables to reach land to be_____ temperature salinity! Affect certain features and functions or drinking water ( if minerals are added.... Nppe ) geographic location cycle plant was investigated to 1,000 meters ) the next region, which thermoclines in the ocean are best developed at sunlight... Roads and is the depth of occurrence, however a problems include the stress of open-ocean conditions more! And nitrite ) than shallow seawater is generally invisible to the shore ________ first accurate global measurements were made the. Nitrite ) than shallow seawater to 55, 65 and 75 respectively brings. The physical and chemical properties of the Atlantic and Pacific subtropical basins is shown in Fig bathypelagic region in of... At specific depths, temperatures, and crabs are the best developed at _____ the.! Of that size would power several thousand homes vary in depth of water, is... Okinawa Prefecture announced the start of the solution gradiant of distinct temperature differences associated with depth in a of. M Moreover, this difference in density with depth in the mesopelagic and epipelagic zones, often!

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